28.0% of a sample of erbium-165 decays in 4.74 hours. The half-life of this isotope (in hours) is 10hr.
What is an isotope?Isotopes are the two or more types of atoms that have the same atomic number (number of protons in their nuclei) and position in the periodic table (and hence belong to same chemical element), and that differ in nucleon numbers (mass numbers) due to different numbers of neutrons in their nuclei. While all the isotopes of a given element have almost the same chemical properties, they have different atomic masses and physical properties.
The number of protons within atom's nucleus is called atomic number and is equal to the number of electrons in the neutral (non-ionized) atom. Each atomic number identifies a specific element, but not isotope; an atom of a given element may have a wide range in its number of neutrons. The number of the nucleons (both protons and neutrons) in the nucleus is the atom's mass number, and each isotope of a given element has a different mass number.
Let us consider initial conc. = [tex]A_{o}[/tex]
final conc. = (100-28)% of [tex]A_{o}[/tex]
according to first order decay law
[tex]At=A_{o} e^{-kt}[/tex], t= time= 4.74hr.
so, 72[tex]A_{o}[/tex]/100 = [tex]A_{o} e^{-4.74k}[/tex]
=1x (72/100) = -4.74k
k = 0.0693
Now, x= 0.693/[tex]t_{1/2}[/tex] , [tex]t_{1/2}[/tex]= half life
putting all the values we can write
0.0693= 0.693/[tex]t_{1/2}[/tex]
[tex]t_{1/2}[/tex]= 10hrs.
so the half life is 10hrs.
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what is the molarity of an aqueous solution that contains 0.0720 g c₂h₆o₂ per gram of solution . the density of the solution is 1.04 g/ml
The molarity of an aqueous solution that contains 0.0720 g C₂H₆O₂ per gram of solution with density 1.04 g/mL is 1.626 M.
Calculating grams of C₂H₆O₂ per ml of solution,
1 mL of solution weighs 1.40 g
1.40 g of solution x 0.0720gC₂H₆O₂ = 0.1008 C₂H₆O₂
1
Concentration of C₂H₆O₂ is 0.1008 g/mL
Now, converting g/mL to molarity, using molar mass.
Molar mass of C₂H₆O₂ = 62 g/mol
0.1008 g ÷ 62 g/mol = 1.626x10⁻³
1 mL = 0.001 L
1.626x10⁻³ = 1.626 M
0.001
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Glucose has a molecular weight of 180 grams per mole. to prepare 1 liter of a 100 mm solution, how many grams of glucose would you dissolve in water for a total volume of 1 liter?
18 grams of glucose would you dissolve in water for a complete volume of 1 liter.
Evaluation :
Glucose features a molecular weight of 180 g/mole
which means that dissolving this mass of glucose in a liter would give a 1 M solution.
Because 100 mM is = 0.1 M, it's 1/10 of the concentration.
Using 1/10 of the relative molecular mass (18 g) in the same volume would give a 1/10 concentration, thus a 0.1 M or 100 mM solution.)
[tex]\frac{1}{10}[/tex]×180 = 18 grams
What is meant by molecular weight?
The sum of the atomic masses of all atoms during a molecule, supported a scale in which the atomic masses of hydrogen, carbon, nitrogen, and oxygen are 1, 12, 14, and 16, respectively.
The relative molecular mass is the mass of one mole of a substance. Usually, the units used for this are grams per mole.
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the volume rate of flow q ithroug a pipe containing a slowly moving liqudi is giving by. would you classify this equation as a general homogenoe sequations
Yes I would verify this equation as a general homogeneous equations.
What is homogeneous equation?
An equation with a differentiation, a function, and a number of variables is called a homogeneous differential equation. For any non-zero constant, the function f(x, y) in a homogeneous differential equation is a homogeneous function such that f(x, y) = nf(x, y).
[tex]Q= 8 μ ℓπ R 4 Δp[/tex] is given.
Put primary FLT dimensions to use.
[tex]L 3 T −1 =( 8π ) (FL −2 T) (L)(L) 4 (FL −2[/tex] Adding and removing each side's exponent.
[tex](L) (3) (T) (−1) =( 8π ) (F) (1−1) (L) (4−2+2−1) (T) (−1)[/tex]
[tex](L) 3 (T) −1 =( 8π ) (L) 3 (T) −1[/tex]
The right side and left side of the equation are identical.
The equation is consequently a general homogeneous equation.
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Question :
The volume rate of flow, Q, through a pipe containing a slowly moving liquid is given by the equation:
Q=\frac{\pi R^{4} \Delta p}{8 \mu \ell}Q= 8μℓπR 4 Δp
where R is the pipe racius, \Delta pΔp the pressure drop along the pipe, \muμ a fluid property called viscosity \left(F L^{-2} T\right)(FL
−2
T), and \ellℓ the length of pipe. What are the dimensions of the constant \pi / 8π/8? Would you classify this equation as a general homogeneous equation? Explain.
The pressure inside a container is 812 Torr at a temperature of 75 °C. What would the pressure be at 57 °C?
Considering the Gay Lussac's law,the pressure at 57°C would be 770 Torr.
Gay Lussac's lawGay Lussac's law establishes the relationship between the temperature and pressure of a gas when the volume is constant.
This law says that the pressure is directly proportional to the temperature of the gas: if the temperature increases, the pressure of the gas increases while if the temperature of the gas decreases, the pressure decreases.
Mathematically, Gay Lussac's law states that the ratio of pressure to temperature is constant:
P÷T= k
If you have an initial state of 1 and a final state of 2, then:
P1÷T1= P2÷T2
Pressure al 57°CIn this case, you know:
P1= 812 TorrT1= 75°C= 348 KP2= ?T2= 57°C= 330 KReplacing in Gay Lussac's law:
812 Torr÷ 348 K= P2÷ 330 K
Solving:
(812 Torr÷ 348 K)× 330 K= P2
770 Torr= P2
Finally, the pressure at 57°C would be 770 Torr.
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m. m. r. howlader and f. zhang, void-free strong bonding of surface activated silicon wafers from room temperature to annealing at 600 ˚c, thin solid films 519 (2010) 804-808.
Surface-activated silicon wafers were bonded firmly and void-free by MMR Howlader from room temperature to annealing at 600 °C, followed by analysis of the interface's optical, electrical, mechanical, and nanostructure properties.
What is annealing?
In the fields of metallurgy and materials science, annealing is a heat treatment that modifies the physical and occasionally chemical properties of a material to enhance its ductility and decrease its hardness, making it more workable.
Annealing is a heat-treatment procedure that modifies a material's physical, and occasionally chemical, properties to improve ductility and decrease hardness to make it more workable.
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what is true about covalent compounds? select all that apply. they have freely-moving electrons. they have freely-moving electrons. they mostly form molecules. they mostly form molecules. they can be gases, liquids, or solids. they can be gases, liquids, or solids. they are made from ions.
The statements that are true about covalent compounds are;
they have freely-moving electronsthey can be gases, liquids, or solid they mostly form molecules.What is covalent compound?Covalent compound refer to elements that are bonded by a covalent bond and it is formed when pair valence electrons in atoms are shared among each other. The compounds with covalent bonding are either liquid or gaseous at room temperature. Examples include ammonia.
Therefore, The statements that are true about covalent compounds are;
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if a 125 ml erlenmeyer flask weighs 88.5 g, what is the volume in liters? group of answer choices 12.5 l 1.25 l 0.125 l 125 l 1250 l
The Erlenmeyer flask that weighs 88.5 g has a volume of 0.125 L
To solve this problem, we have to do the conversion of units with the given information.
Information about the problem:
Volume(mL) = 125 mL1 L is equivalent to 1000 mLBy converting the volume units from milliliters (mL) to litters (L), we have:
125 mL * (1 L / 1000 mL) = 0.125 L
0.125 L is equivalent to 125 mL
What is unit conversion?It is the transformation of a value expressed in one unit of measurement into an equivalent value expressed in another unit of measurement of the same nature.
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Which pair of substances is capable of forming a buffer in aqueous solution?
a. hno3 and kno3
b. hi and nai
c. h2co3 and nacl
d. hcooh and nacooh
CH3COOH is a weak acid.
Why is CH3COOH a weak acid?Being partially dissociated to release the H+ ions when diluted makes CH3COOH a weak acid, according to this definition. e. A relatively small number of H+ ions are released when CH3COOH is diluted, making it a weak acid.Because it only partially dissociates in an aqueous solution or does not fully ionize in solution to form H+ ions, acetic acid (CH3COOH) is a weak acid. The degree to which acid is able to entirely or partially ionize a solution determines how strong the acid is.A weak base, such as CH3COO-, and a weak acid, such as CH3COOH, are both in equilibrium with their ions in water.When compared to HCl, CH3COOH is a weak acid since it only partially dissociates into ions in solution. This is because HCl totally dissociates into ions in solution.Which pair of substances is capable of forming a buffer in an aqueous solution?
Acidic buffer is formed by weak acid and its conjugate base
A basic buffer is formed by a weak base and its conjugate acid
a)
H3PO4 is a weak acid
But its conjugate base H2PO4- is not present
b)
HNO3 is a strong acid.
It cant form a buffer
c)
HCl is a strong acid.
It cant form a buffer
d)
H2CO3 is a weak acid.
But its conjugate base, HCO3- is not present
E)
CH3COOH is a weak acid.
CH3COONa is its conjugate base. They form the acidic buffer.
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conclusion: the overall summary of the results of an investigation and their meaning
control sample: the sample in a controlled experiment whose variables do not change
controlled experiment: an experiment in which only one variable is changed
data: the information that results from a scientific investigation
dependent variable: a variable that is changed by another variable
experimental sample: the sample in a controlled experiment in which one variable changes
independent variable: a variable that causes a change to another variable
model: a representation of a result or idea
observation: the act of using your senses to recognize something; a piece of information gathered using the senses or tools
peer review: evaluation done by scientists on the work and conclusions of another scientist
qualitative: a word describing subjective observations or data that are not based on numbers or precise measurements
quantitative: a word describing objective observations or data that are based on numbers or precise measurements
results: the outcome of a scientific investigation
scientific inquiry: the process of using observations, investigations, and experiments to learn about natural phenomena
The scientific observation definition is any sensory revel about a natural phenomenon. medical observations can occur in a lab placing or inside the herbal world. as instance, watching an apple fall from a tree may be a remark. Noticing that fish handiest come to a specific part of the river in the early morning is likewise an observation.
Smelling rubbish decomposing is another example of observation. Observations can use any of the five senses and include anything that can boost a query or begin research. Extraneous variables may become confounding variables and when they are not controlled early enough in a study, they could affect the results of the experimental research.
An end is a statement based totally on experimental measurements and observations. It includes a precis of the consequences, whether or not or now not the speculation turned into support, the importance of the have a look at, and destiny research. The value of a managed test is that it yields an excessive diploma of self-assurance within the outcome. which variable induced or did no longer purpose an exchange.
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The balanced equation for the reaction in this experiment is 3CuSO4(aq) + 2Al(s) →→→ Al2(SO4)3 + 3Cu(s) In this experiment, you have seen that exactly 1,99 g copper sulphate is reacted aluminium. When the reaction reaches completion, 0,57 g of copper was collected. Determining the limiting reagent 2.1.1 Calculate the number of moles in 1,99g of copper sulphate.
2.1.2 Calculate the number of moles in 0,254g of aluminium.
2.1.3 Determine the limiting reagent in this reaction. Provide some calculations as well as a justification for your answer.
The balanced equation for the reaction in this experiment is 3CuSO4(aq) + 2Al(s) →→→ Al2(SO4)3 + 3Cu(s) In this experiment, you have seen that exactly 1,99 g copper sulphate is reacted aluminium. When the reaction reaches completion, 0,57 g of copper was collected. Determining the limiting reagent 2.1.1 Calculate the number of moles in 1,99g of copper sulphate.
2.1.2 Calculate the number of moles in 0,254g of aluminium.
2.1.3 Determine the limiting reagent in this reaction. Provide some calculations as well as a justification for your answer
3CuSO4(aq) + 2Al(s) → Al2(SO4)3 + 3Cu(s)
as per the reaction , we can see that in this
3 moles of copper sulphate and 2 moles of aluminium required to make 1 moles of aluminium sulphate and 3 moles of copper
so from this we concluded that copper sulphate is limiting reagent because due to high moles needed it will cause to stop reaction
as in reaction 3 moles copper sulphate requires 480g and 2 mole aluminium requires 54g so here CuSO4 is limiting reaction.
2.1.1) number of moles in 1,99g of copper sulphate.
moles= given mass of substance/ molecular mass of substance
moles= given mass of copper sulphate/ molecular mass of copper sulphate
moles = 1,99g/160g
moles=1.24 moles
2.1.2) number of moles in 0,254g of aluminium.
moles= given mass of aluminium/ molecular mass of aluminium
moles=254g/27
moles=0.40mole
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Many industrial companies and car manufacturers design solutions to reduce pollution. Even so, chemicals still enter the atmosphere. Some of these pollutants combine with water in the air to form acid rain.
Which property of acids would cause acid rain to damage buildings over time?
A. Acids taste sour.
B. Acids react with metals.
C. Acids react with limestone.
D. Acids react with indicators.
I THINK THE ANSWER IS (C)
Part 2 of the question
What might be done to prevent acid rain damage to objects from metal and carbonate, such as limestone? Identify a metal object that could be damaged by acid rain. Then, describe what could be done to prevent acid rain damage to it. Do the same thing for an object that contains carbonate
The property of acids which would cause acid rain to damage buildings over time is:
Acids react with limestone.
The correct answer choice is option c.
This simply means that acids has this property which corrodes the surface they come in contact with especially stones.
One of those things which can be done to prevent acid rain damage to objects from metal and carbonate, such as limestone is coating the surface of the metal.However, this can be done by coating the surface of metals, or carbonate by coating it with other metals. By so doing, this can prevent acid rain damage to it.
That being said, by default, concentrated acids are highly corrosive.
Coating surfaces of metals can prevent acid rain damage to it
What is an acid?This refers to a substance which when dissolved in water, it produces hydrogen ion as the only positive ion in the solution.
So therefore, the property of acids which would cause acid rain to damage buildings over time is acids react with limestone.
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Why are nuclear processes significant?
A) They are the only process that can break down protons.
B) They are the only process that can break down electrons.
C) They are the only process that can break down elements.
D) They are the only process that can break down compounds.
The statement that describes how nuclear processes are significant is that they are the only process that can break down elements (option C).
What is nuclear process?Nuclear processes involves two notable types of nuclear reactions, which are;
Nuclear fission reactionsNuclear fusion reactions.Nuclear fission is a nuclear reaction in which a large nucleus splits into smaller ones with the simultaneous release of energy.
On the other hand, nuclear fusion is the combination of the nuclei of small atoms to form the nuclei of larger ones, with a resulting release of large quantities of energy.
Therefore, it can be said that the statement that describes how nuclear processes are significant is that they are the only process that can break down elements.
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Which polyatomic ion is not labeled correctly? group of answer choices
a. nh4+ ammonium
b. no3- nitrate
c. cn- cyanate
d. clo4- perchlorate
e. all are labeled correctly.
The correct answer is option C. CN^- cyanate is wrong polyatomic ion. OCN− is correct polyatomic ion.
What is cyanate ion?
The structural formula for cyanate, commonly abbreviated OCN, is [O=C=N]-. It also includes any salt that contains it, like ammonium cyanate. It is a substantially less stable isomer of the fulminate anion [C−≡N+O]−
A cyanate group-containing organic compound is known as a cyanate ester. An ambidentate ligand, the cyanate ion can form complexes with metal ions in which either the nitrogen or oxygen atom can serve as the electron-pair donor. A bridging ligand can also be produced using it.
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based on the mohs hardness scale which mineral could be scratched by a penny but not by a fingernail
Based at the Mohs Hardness Scale, Calcite will be scratched via way of means of a penny however now no longer via way of means of a fingernail.
What is mohs hardness scale?
The Mohs scale of mineral hardness is a qualitative ordinal scale, from 1 to 10, characterizing scratch resistance of various minerals via the capacity of more difficult fabric to scratch softer fabric.
Despite its loss of precision, the Mohs scale is applicable for area geologists, who use the size to more or less discover minerals the usage of scratch kits. The Mohs scale hardness of minerals may be generally discovered in reference sheets.
Mohs hardness is beneficial in milling. It lets in evaluation of which type of mill will nice lessen a given product whose hardness is known.[8] The scale is used at digital producers for trying out the resilience of flat panel show components (inclusive of cowl glass for LCDs or encapsulation for OLEDs), in addition to to assess the hardness of contact displays in customer electronics.
Based at the Mohs Hardness Scale, Calcite will be scratched via way of means of a penny however now no longer via way of means of a fingernail.
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If one or more nucleotide pairs are deleted from a dna strand, this is known as a:_________
If one or more nucleotide pairs are deleted from a DNA strand, this is known as a frameshift mutation
Define Frameshift Mutation
Insertions or deletions in the genome that are not multiples of three nucleotides are referred to as frameshift mutations. They are a particular class of insertion-deletion (indel) alterations that are present in polypeptides' coding sequences. Here, there are no multiples of three in the number of nucleotides that are added to or subtracted from the coding sequence. They may result from really basic alterations like the insertion or deletion of a single nucleotide.
Frameshift mutations' effectsOne of the most harmful modifications to a protein's coding sequence is a frameshift mutation. They are quite prone to produce non-functional proteins that frequently interfere with a cell's metabolic processes and result in significant alterations to polypeptide length and chemical makeup. Frameshift mutations can cause the mRNA to stop translating too soon and create an extended polypeptide.
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Calculate the amount of water that must be added to 6.55 g of nacl to make a solution that is 16.2y mass at 25c.
The amount of water that must be added to 6.55 g of nacl to make a solution that is 16.2 % by mass at 25c is 33.8grams.
Given, the mass of NaCl = 6.55grams.
given, Percentage by mass of the solution is 16.2%
By percentage by mass formula we calculate the mass of NaCl in the solution.
Percentage by mass of the solution = Weight of NaCl / mass of solution(w) ×100
16.2 = 6.55/ (w) ×100
on calculating, we get w = 40.43grams.
Now, mass of the solution = mass of NaCl + Mass of water
40.43g = 6.55 + Mass of water
Mass of water = 33.8grams.
Thus, the mass of water which can be added to the solution which is 16.2% by mass is 33.8grams.
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what is the stretching frequency (in cm-1) of the following carbonyl? group of answer choices 1655 1685
The stretching frequency (in cm⁻¹) of the given carbonyl compound is 1685 cm⁻¹
The carbonyl group, C=O, has a large dipole moment and it creates an intense stretching vibration whose peak generally appears between 1600 to 1800 cm⁻¹.
The spectrum shows a stretching absorption consistent with a ketone functional group, i. e. carbonyl group C=O stretching at ~1685 cm⁻¹.
Definition: Stretching frequencies are higher than corresponding bending frequencies. It is easier to bend a bond than to stretch or compress it.
The distinctive carbonyl band is particularly useful for diagnostic purposes because it has a characteristic high intensity and few other functional groups absorb in this region.
Different carbonyl compounds absorb in narrow ranges within the general carbonyl region.
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If a scientist wanted to compare air quality throughout the united states but was unable to test the air in every city, the scientist could compare the air quality in a ______ or subset of cities.
If a scientist wanted to compare air quality throughout the united states but was unable to test the air in every city, the scientist could compare the air quality in a sample or subset of cities.
How to check the air quality?
The Air Quality Index, or AQI, is used to gauge air quality. The AQI functions similarly to a thermometer with a range of 0 to 500 degrees. But the AQI is a technique of displaying variations in the quantity of pollution in the air, not changes in temperature.
How do you sample air quality?
Small volumes of air can be collected through air sampling for testing in laboratories. The majority of air sampling techniques use a suction mechanism to draw complete air samples into a bag or container. After that, the bag or container can be sealed before being sent to a lab for analysis.
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Discuss Dalton’s ideas by completing the following paragraph. After years of studying _____, Dalton was able to accurately determine the ______ of the elements involved in the reactions. His conclusions resulted in the ____________, which helped to explain that ________ in chemical reactions separate, ________ or ___________, but are not created, ___________, or _________.
1.Chemical reactions
2. Mass ratios
3. Atomic theory
4. Atoms
5. Combine
6. rearrange
7. Destroyed
8. Divided
What is the atomic theory?The atomic theory is a scientific description of the nature of atoms and matter.
The Dalton's atomic theory was the first complete attempt to describe all matter in terms of atoms and their properties.
After years of studying Chemical reactions, Dalton was able to accurately determine the mass ratios of the elements involved in the reactions. His conclusions resulted in the atomic theory, which helped to explain that atoms in chemical reactions separate, combine or rearrange, but are not created, destroyed, or divided.
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What mass of copper atoms have the same number of atoms as there are in a 4.21 gram sample of silicon?
The mass of copper atoms have the same number of atoms as there are in 4.21 g sample of silicon is 9.55 g
Avogadro's hypothesis1 mole of silicon = 6.02×10²³ atoms
But
1 mole of silicon = 28 g
Thus, we can say that:
28 g of silicon = 6.02×10²³ atoms
How to determine the atoms in 4.21 g of silicon28 g of silicon = 6.02×10²³ atoms
Therefore,
4.21 g of silicon = (4.21 × 6.02×10²³) / 28
4.21 g of silicon = 9.05×10²² atoms
Thus, 9.05×10²² atoms is present in 4.21 g of silicon
How to determine the mass of copper that contains 9.05×10²² atomsFrom Avogadro's hypothesis ,
6.02×10²³ atoms = 1 mole of copper
But
1 mole of copper = 63.55 g
Thus, we can say that:
6.02×10²³ atoms = 63.55 g of copper
Therefore,
9.05×10²² atoms = (9.05×10²² × 63.55) / 6.02×10²³
9.05×10²² atoms = 9.55 g of copper
Thus, 9.55 g of copper contains the same number of atoms in 4.21 g sample of silicon
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When replacing a system baord on a server using liquid cooling in place of tradtional heart sinks to coll the cpus, what facts are true?
Simply transfer the cold plate/processors to the new system board; there is no need to remove the processor or disrupt the thermal material bond from the cold plate.
How does server liquid cooling function?A cold-water conduit into your CPU is only one form of liquid cooling; there are a few others as well. Some server cabinets have chilled rear doors where cool air is pushed onto the server and cold water is piped through.
How does the cold plate technology function?Microsoft is one of the IT corporations working with cold plate technology, which uses pipes of liquid to cool servers through metal plates. By employing it to cool the chips that record digital currency transactions, participants in the cryptocurrency business invented liquid immersion cooling for computing hardware.
In a CPU cooler, where does the coolant go?The water block's coolant absorbs the heat from the CPU. To keep the processor or graphics card cold, a cooling liquid is known as coolant loops around the cooling kit. To remove air bubbles from the liquid as it circulates, the reservoir stores extra coolant.
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What amount of heat must be added to 75g of ethyl alcohol to heat it from -5c to 35c
7380 J/g is the amount of heat must be added to 75g of ethyl alcohol to heat it from -5c to 35c
What is specific heat capacity?
The quantity of heat energy needed to raise the temperature of a unit mass of any substance or matter by one degree Celsius is known as its specific heat capacity.
The formula is as follows:
Q= m c ΔT
Here, Q is the quantity of heat energy needed to raise the temperature of one kilogram of a substance by one degree Celsius, and s is the system's specific heat capacity.
Here,
m = 75g
c = 2.46J/g °C
ΔT = 40°C
Q = 75*2.46*40 = 7380 J/g
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Calculate the ph of a dilute solution that contains a molar ratio of potassium acetate to acetic acid (pka = 4.76).
pH = 5.46.
What is a mole ratio example?A chemical reaction's molar ratio is the ratio of the moles (or molecules) of reactants used and the moles (or molecules) of products produced.Two moles of H2O are produced for every mole of O2 that is utilized. H2 and H2O have a mole ratio of 1:1. Two moles of H2 are needed to create two moles of H2O. Four moles of hydrogen would be required to make four moles of water.The ratio between any two compounds in a chemical reaction is known as the mole ratio. It is the proportion between two coefficients in a chemical equation that is balanced. Mole-to-mole ratio and molar ratio are other names for the mole ratio.Use the atomic masses to translate each element's mass into moles. By dividing the total number of moles by the smallest number of moles, you may determine the ratio or the number of moles of each element.Using the Henderson-Hasselbalch equation,
pH pKa log
pH 4.76 log ([acetate]/[acetic acid]), where [acetate]/[acetic acid] is the ratio given for each part of the question.
pH = pka + log [acetate/acetic acid]
pH = 4.76 + log ( 5/1)
pH = 5.46
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3. What is the SI unit for volume?
Answer:
m³ (cubic metres)
Explanation:
m³ is the SI unit for measuring volume.
Answer:
The SI unit is m³ (cubic meters)
Explanation:
Consider a 100 ml solution of a 0.0010 m solution of methyl amine, ch3nh2, where kb = 4.4 x 10-4 . a) what is the ph of this solution?
The strong base has a pH near 14 and the pH of the strong acid is near to 1. If we diluted the solution weak base solution, then the concentration of hydroxide.
What is ph?Chemistry uses a pH scale to categorize an aqueous solution's acidity or basicity. The term pH originally meant "potential of hydrogen." In comparison to basic or alkaline solutions (solutions with higher H+ ion concentrations), acidic solutions have lower pH values measured.
The p Hscale is logarithmic and inversely proportional to the amount of hydrogen ions present in the solution.
M is equal to mol dm3. At a temperature of 25 °C (77 °F), basic solutions are defined as those with a pH greater than 7, and acidic solutions as those with a pH lower than 7. Solutions having a pH of 7 are regarded as neutral at this temperature (e.g. pure water). Temperature affects the pH's neutral value, which drops to below 7 if the temperature exceeds 25 °C.
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Based on what you observed during this experiment, is dichloromethane denser or less dense than water? explain your reasoning.
Due to its higher density than water, dichloromethane creates an organic layer below the aqueous layer as opposed to above it as other solvents do.
Which compound is dichloromethane?
Organochlorine chemical dichloromethane (DCM, often known as methylene chloride or methylene bichloride) has the formula CH2Cl2. A common solvent is this colorless, flammable liquid with a sweet, chloroform-like odor. Although it is polar and miscible with many organic solvents, it is not miscible with water.
Methylene chloride, often known as dichloromethane, is an organic halogen compound that is colorless, volatile, and essentially nonflammable. It is frequently employed as a solvent, particularly in paint-stripping formulas.
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How much taller does the eiffel tower become at the end of a day when the temperature has increased by 17 degrees c. its original height is 321 m and you can assume it is made of steel.
The height of the Eiffel tower after increase in temperature will be 321.06548m.
The volume expands due to heat, adding a few millimetres to the height of the Eiffel Tower. The Tower is also slightly tilted away from the sun as a result of its enlargement. The Eiffel Tower leans because only one of its four sides receives sunlight, which creates an imbalance with the other three sides, which remain stable.Temperature increased by 17⁰C
original height of tower is 321m
∆T = 17⁰C
We know that coefficient of thermal expansion for steel 12×10-⁶C-1.
The increase in height is given by
∆h = αh∆T
Putting values in the above equation
∆h = 12×10-⁶× 321 × 17
∆h = 0.065484m
therefore, the height after temperature increase by 17⁰c will be 321.06548m
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How to work out number of protons, electrons and neutrons?
Answer:
protons=atomic number
electrons=atomic number-charge
proton=atomic mass-atomic number
A 0.2-kg metal object requires 502 joules of heat to raise its temperature from 20 to 40 degrees celsius. the specific heat capacity of the metal is what?
The specific heat capacity of the metal having 0.2kg mass is -125.5 J/kg°C.
The formula to calculate specific heat is
c = Q / mΔT
c = 502 / 0.2 (-20)
c = -125.5
What is specific heat?
The amount of heat required to increase the temperature of 1 gram of a substance by 1 degree Celsius (°C) is known as specific heat. Since water has a higher specific heat than other substances, it requires more energy to raise its temperature.
In order to distinguish between two polymeric composites, specific heat is useful in estimating the processing temperatures and the quantity of heat required for processing.
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What is the largest exponent the ieee standard allows for a 32-bit floating point number?
The maximum representable value maximizes both the significant and the exponent, so it has a value +1∗(2−223)∗2127.
A single-precision ("binary32") IEEE 754 floating-point number has 1 bit for the sign, 8 bits for the exponent, and 23 bits for the significand (a 24-bit quantity given that the leading 1 is implicit). Its value is equal to the product of the sign, the significand, and two to the power of the exponent.
The exponent values range from -126 to 127. In IEEE 754, the actual value stored is unsigned (from 0 to 255) and then biased by 127.
Similarly, the maximum value for the significand is binary 1.111111111111111111111111. This is S=20+2−1+2−2+...+2−23. You can see that adding 2−23 to the right-hand side results in 21, so S=2−2−23.
The maximum representable value maximizes both the significant and the exponent, so it has a value +1∗(2−223)∗2127.
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