Considering the definition of calorimetry, if 200.0 g of ice absorb 1255.0 J of heat, the temperature change is 2.988°C.
Definition of calorimetryCalorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change). So, the amount of heat that a body receives or transmits is determined by the following expression:
Q = c×m×ΔT
Where:
Q is the heat exchanged by a body of mass m.c is a specific heat substance.ΔT is the temperature variation.Temperature change in this caseIn this case:
Q= 1255 Jc= 2.1 J/gCm= 200 gΔT= ?Replacing in the definition of calorimetry:
1255 J = 2.1 J/gC× 200 g× ΔT
Solving:
1255 J ÷(2.1 J/gC× 200 g)= ΔT
2.988 °C= ΔT
Finally, the temperature change is 2.988°C.
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Uranium-238 is an unstable nuclide that emits an alpha particle, three neutrons, and gamma particles. A = 231 and Z = 90. What daughter nuclide is formed from this reaction?
A) Ra
B) Th
C) Pu
D) Fr
The daughter nuclide that is formed from this reaction is Ra.
What is radioactivity?We define radioactivity as the spontaneous disintegration of the atom of a substance. We know that in the process of radioactivity there is the formation of daughter nucleus which are somewhat different from the given parent nucleus.
Now, we are told that, Uranium-238 is an unstable nuclide that emits an alpha particle, three neutrons, and gamma particles. Since we are told that there is an alpha decay then it means that the daughter nucleus is less than the atomic number of the parent by two units.
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I need HELP fast!!!
At the end of the video, the man getting interviewed provides an analogy about meditation and states of matter. Create your own analogy that explains the differences between the behavior of molecules in different states of matter. Explain.
The differences between the behavior of molecules in different states of matter is marathon runner
Molecule are made up of one or more atom and also the smallest particle of any substance which can exist independently and retain physical and chemical properties of the substances
They would be close to each other and are tightly packed like solid molecules and then the race was stared they were loosely packed compared to solid and then at the game reaches at the end point the players will be spread out and they would be more loosely packed compared to solid and liquids
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naoh is hygroscopic, meaning it absorbs water from the air. you can measure the amount of water it absorbs by taking its mass before and after removing the water in an oven (by the difference in mass before and after). would you use an analytical or top-loading balance for this?
It is better to use the analytical balance for smaller amounts of sodium hydroxide (up to a couple of grams).
The sensitivity of the analytical balance goes to a couple of tenths of a milligram, while the sensitivity of a top-loading balance goes to tens of milligrams at best. The amount of water absorbed by sodium hydroxide is significant, but not too great relative to the mass of the sample. With this in mind, it is far more recommendable to use the analytical balance over the top-loading balance in order to be able to register the change in mass at all.
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If an object that weighs 50 N displaces a volume of water that weighs 10 N,what is the buoyant force on the object?
10 N
Buoyant force is equal to the weight of the displaced fluid; acting in the upward direction.
Answer:We know that when a body is fully or partially submerged in a fluid,its weight is decreased and that amount of decrease is equals to the weight of the fluid displaced by it.
So,this apparent reduction of weight is due to the buoyancy force acting,which is equals to the weight of the fluid displaced by the body.
So,here the buoyancy force acting on the object is
10
N
Explanation:
a sample of br2(g) takes 46.0 min to effuse through a membrane. how long would it take the same number of moles of ar(g) to effuse through the same membrane?
From the equation of Graham's law of diffusion of gases, it would take the same number of moles of Ar(g) 23 minutes to effuse through the same membrane.
What factors affect the rate of diffusion of gases?The rate of diffusion or effusion of gases is affected by temperature, concentration, pressure, and the molecular weight of the gas.
The gas law that describes how the molecular weight or vapor density of a gas affects the rate of diffusion is Graham's law of diffusion of gases.
Mathematically, Graha's law of diffusion of gases is given below as follows:
R₁ / R₂ = √(M₂ / M₁) or T₁ / T₂ = √(M₁ / M₂)
where;
R₁ is the rate of diffusion of gas 1
T₁ is the time of diffusion of gas 1
M₁ is the molecular weight of gas 1
R₂ is the rate of diffusion of gas 2
T₂ is the time of diffusion of gas 2
M₂ is the molecular weight of gas 2
Substituting the values in the second equation:
The molecular weight of Br₂ = 160 g/mol
The molecular weight of Ar = 40 g/mol
46 / T₂ = √(160 / 40)
T₂= 46 / 2
T₂ = 23 mins
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a sample of a material has 20002000 radioactive particles in it today. your grandfather measured 40004000 radioactive particles in it 6060 years ago. how many radioactive particles will the sample have 60 years60 years from today?
The remaining mass of radioactive elements with 60 years of half-life is 1000 particles.
We need to know about the half-life of the radioactive elements to solve this problem. The radioactive element will decay over time and follow the equation
N = No(1/2)^(t/t'')
where N is the final quantity, No is the initial quantity, λ is the decaying constant, t is time and t'' is the half-life of a radioactive element.
From the question above, we know that
t'' = 60 years
No = 2000 particles
t = 60 years
Calculate the remaining mass
N = No(1/2)^(t/t'')
N = 2000 x (1 / 2)^(60 / 60)
N = 1000 particles
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Enzyme A is currently functioning at a temperature of 55 and a pH of 7. According to the information provided in the chart, select all factors that would increase the rate of function of enzyme A?
A
Increase the temperature to 70∘^{\circ}
B
Increase the pH with the addition of a base
C
Decrease the temperature to 40∘C
D
Decrease the pH with the addition of an acid
The factor that will increase the rate of the function of the enzyme A is increasing the temperature to 70°C (option A).
What is an enzyme?Enzymes are biological catalysts meaning that they regulate the rate of biochemical reactions in living cells.
Enzymes lower the activation energy of a reaction, which is the required amount of energy needed for a reaction to occur. Enzymes do this by binding to a substrate and holding it in a way that allows the reaction to happen more efficiently.
The factors that affect the rate of function of na enzyme are as follows:
TemperaturepHSubstrate concentrationEnzyme concentrationEach enzyme has an optimum pH range. This means that changing the pH outside of this range will slow enzyme activity, however, raising temperature generally speeds up a reaction, and lowering temperature slows down a reaction.
Therefore, the increase of temperature will increase the rate of function of the enzyme A.
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Write four components of a modern detergent and the uses of the components
The four main components of a modern detergent are builders (50% by weight), surfactants (15%), bleach (7%), and enzymes (2%).
What is the use of the components in the detergent?A detergent can be described as a surfactant or a mixture of surfactants with cleansing properties in dilute solutions. These substances are similar to soap but are more soluble in hard water due to the polar sulfonate is less likely than the polar carboxylate of soap to bind ions in hard water.
Builders are water softeners and their anions react with cations to form insoluble compounds which precipitate onto fabrics and washing machines and which are hard to remove.
Surfactants provide absorption and emulsification of soil into the water and also by reducing the surface tension of water to improve wetting. The main function of bleaches is oxidizable organic stains, which are usually of vegetable origin.
Enzymes are needed to degrade stubborn stains composed of proteins, fats, starch, and cellulose.
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A chemical reaction combines the metal sodium (NA) and the gas chlorine (cl2) to form sodium chloride, commonly known as table salt (nacl) why does this produce have different properties from the reactants
When a chemical reaction happens, the atoms in the reactants are rearranged to create compounds with various chemical characteristics. Although identical atoms are present in both the reactants and the products, sodium chloride was produced by rearranging the atoms in the reactants. The reactants lacked sodium chloride.
Sodium is a soft, silver-colored metal that may be sliced with a knife. With water, pure sodium metal reacts violently (and even explosively), creating sodium hydroxide, hydrogen gas, and heat.
2Na(s) + 2H₂O(l) ⟶ 2NaOH(aq) + H₂(g)
Chlorine is a poisonous yellow-green gas with a pungent smell.
But when sodium and chlorine combine, they create sodium chloride, or table salt, which is known to practically everyone in the world.
2Na(s) + Cl₂(g) ⟶ 2NaCl(s)
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if i have an unknown quantity of CI2 at a pressure of 1.2 atm, a volume of 31 liters and a temperature of 87C, how many moles of CI2 do i have
Answer:
I think 1.3 moles correct me if I'm wrong
Explanation:
christian has a mass of 5 kg. he is running across the room accelerating at a rate of 10 m/s2. what is his force?
The force required to move a body with a mass of 5kg and accelerating at 10m/s² is 50 Newtons.
What is the force of Christian?A force is simply a push or pull of a body resulting from the object's interaction with another object.
From Newton's Second Law, force is expressed as;
F = m × a
Where is mass of object and a is the acceleration
Given the data in the question;
Mass m = 5kgAcceleration a = 10m/s²Force F = ?Plug the given values into the equation above and solve for F.
F = m × a
F = 5kg × 10m/s²
F = 50kgm/s²
F = 50N
Therefore, the force of Christian is 50 Newtons.
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The force required to move the body with the mass of 5 kg with acceleration of 10 m/s² is 50 Newtons.
What is force?Force is defined as a push or pull exerted on an object as a result of the interaction of the object with another object.
It can also be defined as an external factor that, when used, alters or has the potential to alter the state of the body.
Force can be expressed as
Force = mass x acceleration
Given, Mass = 5 kg
Acceleration = 10 m/s²
So, F = m x a
F = 5 kg x 10 m/s²
F = 50 kgm/s²
F = 50 Newtons
Thus, the force required to move the body with the mass of 5 kg with acceleration of 10 m/s² is 50 Newtons.
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Select all the correct answers. what are three reasons why nebulae contribute more to stellar formation than other regions of the universe? they are rich in hydrogen and helium. they have an unlimited supply of hydrogen. they are far away from black holes. they are dense and hot. they have a strong gravitational pull.
Answer:
1 ) They are wealthy in gases hydrogen and helium. 2 ) They are very hot and dense . 3 ) They have a solid gravitational pull.
Explanation:
Space where huge size of gaseous and dust cloud is present is called nebula. It is mainly made of hydrogen and helium. Nebula exist in the space which is between the stars and it is call as interstellar space.
Helix nebula is closest nebula which is near the earth. It’s distance from earth is about 700 light years.
Dark nebulae are very dense as well as cold. Nebula can be divided into dark nebula and bright nebula. The gas which is present between the stars is always combine with solid grains cosmic dust.
Nebulae contribute more to stellar creation than other areas of the universe for the following three reasons:
They are abundant in helium and hydrogen.They are hot and thick.They are highly gravitationally drawn.So, the correct options are A, D and E.
What is Nebulae?Huge clouds of gas and dust known as nebulae are found in space and are made up of heavier elements in the form of dust particles as well as ionized gases like hydrogen and helium.
Because the gases and dust within them have the potential to collapse under the influence of gravity and form new celestial objects, they are frequently the birthplace of stars and planetary systems. They are rich in hydrogen and helium. They have a strong gravitational pull and are hot and dense.
Hence, the correct options are A, D and E.
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Select all the correct answers. what are three reasons why nebulae contribute more to stellar formation than other regions of the universe?
they are rich in hydrogen and helium. they have an unlimited supply of hydrogen. they are far away from black holes. they are dense and hot. they have a strong gravitational pull.how America can best accelerate its transition to renewable energy
500-1000 words essay
America can best accelerate its transition to renewable energy by :
The effort to eliminate carbon emissions on a net basis by 2050 will accelerate innovation and create the largest reallocation of capital.Rising geopolitical tensions have targeted the focus of industries on energy security, reliability and sustainability.Companies and governments are facing pressures to provide more oil and gas supply along with accelerating the energy transition.Renewable digital technologies are emerging with a game-changing take on artificial intelligence, machine learning and automation.Need to accelerate the transition of national net-zero energy ecosystems.Transformation on this scale will require a combination of vision, imagination for companies and investors to achieve their decarbonization ambitions.To know more about renewable energy, refer
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PLEAASE HELP
Solid aluminum reacts with aqueous zinc bromide to form solid zinc and aqueous aluminum bromide .
Write a balanced chemical equation for this reaction.
A chemist has a block of aluminum metal (density is 2.7 g/mL). The block weighs 1.9 g. What is the volume, in mL, of the aluminum block?
Answer: v = 0.70 ml
Explanation:
1. We can use the Density equation
(d = density (g/ml), m = mass (g), v = volume (ml))
D = m/v
2. Plug in what we have and solve for v.
2.7 = 1.9/v
v = 0.70 ml
How does one periodic trend connect a racial trend in American Society? Why is it important to understand racial trends in American Society?
A periodic trend connect a racial trend in American Society ad it affect the distribution of power, wealth, opportunity, and create enduring social stratifications.
It is important to understand racial trends in American Society as it helps in understanding the society better.
How to illustrate the information?A trend is a shift or progression toward something new or different. Global migration is one of the most significant developments nowadays.
Today, 244 million individuals live in nations other than their native countries, which is three times the number in 1960. The world's migrant population would be the sixth largest country.
It should be noted that among the issue of racial trend is also the issue of black lives matter. This is important in order to end discrimination and also enhance the development in the country.
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what is the purpose of using the Bohr model? what does this model shows . ?
i need helppp bro
Answer:
The purpose of a Bohr model is to show the atom(s) as a central nucleus; containing protons and neutrons with the electrons in circular orbitals at specific distances from the nucleus.
Explanation:
Have a great rest of your day
The one and only,
-Mr. Universe
In 1913 Bohr proposed his model of the atom , it's purpose was to explain how electrons can have stable orbits around the nucleus. It shows electrons orbiting the nucleus of an atom -He found that electrons farther away from the nucleus have more energy, meaning the electrons that are closer to the nucleus have less energy.
For example...(shows Bromine )
(you can give that gentleman up top brainliest)
A salvage yard contains a mixture of iron, glass, aluminum, and plastic. which property of iron does the salvage yard take advantage of when separating the iron from the rest of the materials?
Magnetic property of iron will help in seperating iron from rest of the materials.
Iron is a metal and have magnetic property. Magnetic property is property of metal in which metal has the attraction power to attract other metal. Iron is ferromagnetic but it requires certain temperature and certain conditions. It occurs below 770°C, which is curie temperature.
There are 5 magnetic properties
Property 1: Intensity of magnetisationProperty 2: Magnetic Field (H) or Magnetic intensity. Property 3: Magnetic susceptibilityProperty 4: RetentivityProperty 5: Coercivitytypes of magnetic materials
Diamagnetic Material,Paramagnetic Materials,Ferromagnetic Materials,Antiferromagnetic Materials,Ferrimagnetic Materials.
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How many molecules of sucrose are
in 205 g C12H22011?
(C12H22O11, 342.34 g/mol)
[?]
[? ]×10¹²] molecules C12H22O11
Coefficient (green) Exponent (yellow)
I
Enter
To begin with, sucrose is C12H22O11. Additionally, we must determine how many moles of sucrose there are in a pound of sucrose:
The moles of sucrose are 454g, 342.30g, mol1, and 1.33mol.
Is sucrose a good sugar to use?
Brief Summary According to a University of California, Davis study that was published in the Journal of Clinical Endocrinology and Metabolism, sucrose, the more "natural form of sugar," may be just as harmful to your health as HFCS.
Is sugar a healthy food?
Your body only receives sugar when you consume sucrose like soda or candy, and typically too much of it. The threat is present here. You run the risk of major health problems if you consume too much added sugar (fructose or sucrose) in your diet.
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If you assumed 100 total atoms in a sample, how could you relate the % values shown in the sim into a number you could use for your calculation of average atomic mass?
If you assumed 100 total atoms in a sample, you could relate the % values shown in the sim into a number you could use for your calculation of average atomic mass is
Average atomic mass = ∑ ( isotope mass × % of abundance )
To calculated the average atomic mass, we have to multiply the isotopes mass of each to the % abundance then add .
the formula for the calculation of average atomic mass :
Average atomic mass = ∑ ( isotope mass × % of abundance )
Thus, If you assumed 100 total atoms in a sample, you could relate the % values shown in the sim into a number you could use for your calculation of average atomic mass is
Average atomic mass = ∑ ( isotope mass × % of abundance )
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you are going to measure the conductivity of the analyte beaker during a titration. initially, the beaker contains only aqueous mgcl2, which fully dissolves in water. generally, how many ions does each molecule of mgcl2 break into? group of answer choices
Each magnesium chloride (MgCl₂) molecule dissociates into 3 ions in total.
Magnesium chloride (MgCl₂) is a salt which means that, upon dissolving in water, it will dissociate, giving positively charged metal cations (here, magnesium ions) and negatively charged anions formed from nonmetals (here, chloride ions). The balanced reaction equation for magnesium chloride (MgCl₂) dissociation looks like this:
MgCl₂(aq) → Mg²⁺(aq) + 2Cl⁻(aq)
We can see that, upon dissociation, each molecule of magnesium chloride forms a single magnesium ion (Mg²⁺) and two chloride ions (Cl⁻). So, in total, 1 + 2 = 3 ions are formed from each unit of magnesium chloride.
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help pleasee! will
give brainliest +80 pts
The name of the compounds of nonmetallic elements are:
GeH₄ - germanium tetrahydrideN₂Br₄ - dinitrogen tetrabromideP₂S₅ - phosphorus (v) sulfideSeO₂ - selenium (iv) oxideNH3 - ammoniaSiO₂ - silicon (iv) oxideThe formula of the binary compounds of nonmetallic elements are:
phosphorus triiodide - PI₃silicon tetrachloride - SiCl₄dinitrogen pentoxide - N₂O₅dinitrogen tetroxide - N₂O₄carbon monoxide - COThe formula of the compounds of nonmetallic elements are:
carbon dioxide - CO₂sulfur hexafluoride - SF₆dinitrogen tetrachloride - N₂Cl₄carbon tetraiodide - CI₄phosphorus pentafluoride - PF₅diphosphorus pentoxide - P₂O₅What are the formulas of compounds?The formula of compounds are formulas that are used to represent the compound.
The formula of compounds uses the symbols of the elements present in the compound to represent the compound.
The moles of atoms of each element present in the compound is written in subscripts in the formula of the compound.
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Calculate the mass of water of hydration lost and the mass of dehydrated salt remaining (CuSO4(s)).
According to the concept of molar mass, mass of water of hydration lost is 90 g/mole and mass of dehydrated salt is 159.68 g/mole as the mass of copper sulfate pentahydrate is 249.68 g/mole.
What is molar mass?Molar mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molar mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.
The molecular mass and formula mass are used as synonym for the molar mass.It does not depend on the amount of substance which is present in the sample.It has units of gram/mole.
Molar masses of an element are given as relative atomic masses while that of compounds is the sum of relative atomic masses which are present in the compound.
Copper sulfate along with water of hydration has mass of 249.68 g/mole.On heating , the mass of water of hydration lost =90 g/mole
∴mass of dehydrated salt=249.68-90=159.68 g/mole.
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please help ASAP thank you!
Answer:
it's C
Explanation:
the mitochondria makes energy for the cell so without it there's no energy for the cell
How many molecules are there in 4.00 moles of glucose, C6H1206?
Molecules in 4 moles of glucose are 24.088x10²³.
We need to find the number of molecules by applying the concept of moles
number of moles(n)= Number of Molecules(N)/Avogadro's Number(Nₐ)
n=N/Nₐ
4=N/6.022x10²³
N=24.088x10²³
Therefore, the number of molecules in 4 moles of Glucose is 24.088x10²³.
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Look at the diagram below. Which part, A-C, correctly shows the electronic structure of a sodium ion?
The correct diagram is C as it is the correct electronic configuration for Sodium ion
What is electronic configuration ?
The description of the positions of the electrons around a nucleus is called an electron configuration. As we previously discovered, every neutral atom contains an equal number of protons and electrons. Now, we'll arrange those electrons such that they stand around the nucleus in a way that shows their energy and the nature of the orbital in which they are housed.
Na ( Sodium )
Atomic Number - 11
Electronic Configuration : 2,8,1
Na+ ( Sodium ion)
Electronic Configuration : 2,8
The correct diagram is C as it is the correct electronic configuration for Sodium ion
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True or false? First nations people along the west coast of british columbia used smelting technology to create copper plaques
First nations people along the west coast of British Columbia used smelting technology to create copper plaques is false.
Smelting process is the form of extractive metallurgy to produce a metal from its ore. it is the process of melting and separation of charges . it is extensive energy process. Plaques are made by pouring molten metal in to a mold. and when it gets cools , it solidified into a copper solid plaque. first nation people use copper as hunting weapons, spear tools etc. copper is metal.
Thus, First nations people along the west coast of British Columbia used smelting technology to create copper plaques is false.
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how does hydrogenation affect unsaturated fats? a. it changes them so they are more water-soluble. b. it changes solid fats to trans fatty acids. c. it changes them to polyunsaturated fats as it removes hydrogen atoms. d. it adds antioxidants to them, creating a better-preserved product. e. it adds hydrogen atoms to their chains, making them more saturated.
Hydrogenation affects unsaturated fats by adding hydrogen atoms to their unsaturated chains and making them be more saturated.
What is unsaturation?Unsaturation in organic compounds is an indication of the presence of double or triple bonds in one or more C-C bonds in the structure of the compounds.
Saturated organic compounds do not have double or triple C-C bonds in them.
Unsaturated compounds, therefore, have the tendency to undergo addition reactions due to the presence of the double/triple bond.
Hydrogenation of unsaturated fats is an additional reaction. The hydrogen atoms attach themselves by pairing with the lone electron pairs in the double or triple bonds.
Thus, the addition of hydrogen makes unsaturated compounds to be more saturated.
Saturated compounds, on the other hand, can only undergo substitution reactions instead of addition reactions.
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11. How is the atomic emission spectrum of an element produced?
Answer:
Atomic emission spectra are produced when excited electrons return to the ground state. When electrons return to a lower energy level, they emit energy in the form of light.
Explanation:
what mass of magnesium bromide is formed when one grams of magnesium reacts with 5 g of bromine
Taking into account the reaction stoichiometry, a mass of 7.57 grams of MgBr₂ is formed when one grams of magnesium reacts with 5 g of bromine.
Reaction stoichiometryIn first place, the balanced reaction is:
Mg + Br₂ → MgBr₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Mg: 1 moleBr₂: 1 moleMgBr₂: 1 moleThe molar mass of the compounds is:
Mg: 24.31 g/moleBr₂: 159.8 g/moleMgBr₂: 184.11 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
Mg: 1 mole ×24.31 g/mole= 24.31 gramsBr₂: 1 mole ×159.8 g/mole= 159.8 gramsMgBr₂: 1 mole ×184.11 g/mole= 184.11 gramsLimiting reagentThe limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.
Limiting reagent in this caseTo determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 24.31 grams of Mg reacts with 159.8 grams of Br₂, 1 grams of Mg reacts with how much mass of Br₂?
mass of Br₂= (1 grams of Mg× 159.8 grams of Br₂) ÷24.31 grams of Mg
mass of Br₂= 6.57 grams
But 6.57 grams of Br₂ are not available, 5 grams are available. Since you have less mass than you need to react with 1 grams of Mg, Br₂ will be the limiting reagent.
Mass of MgBr₂ formedConsidering the limiting reagent, the following rule of three can be applied: if by reaction stoichiometry 24.31 grams of Mg form 184.11 grams of MgBr₂, 1 grams of Mg form how much mass of MgBr₂?
mass of MgBr₂= (1 grams of Mg× 184.11 grams of MgBr₂)÷ 24.31 grams of Mg
mass of MgBr₂= 7.57 grams
Then, a mass of 7.57 grams of MgBr₂ can be produced.
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