The number of moles of carbon in the original sample is 0.15 moles.
Let the formula of compound be CaHbOc.
The reaction when this compound undergoes combustion is as follows,
CaHbOc + O2 = CO2 + H2O
We are given that 4.50 g of compound releases 6.60 g of CO2 and 2.70 g of H2O.
First we have to calculate the moles of CO2 and H2O by dividing the given mass by their molar mass.
Moles of CO2 = 6.60/44 = 0.15 moles
Moles of H2O = 0.15 moles
The mass of carbon in CO2 = 0.15 x 12 = 1.80 g
The mass of carbon in CO2 is equal to the mass of carbon in the original sample.
Therefore, the number of moles of carbon in the original sample is 0.15 moles.
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voodoo money voodoo money voodoo money?
Answer:
voodoo voodoo voodoo
A person is told to take 1.25 mg of vitamin D daily. How many 0.250 mg tablets should this person take
5 tablets must be taken by the patient each day.
In a randomized clinical experiment with nursing home residents, the effects of equal oral vitamin D3 doses of 600 IU/day, 4200 IU/week, and 18,000 IU/month on vitamin D status were compared. The most efficient dosage was a daily dose, followed by a weekly dose and a monthly dose. It is believed that vitamin D status is affected equally by equivalent daily, weekly, or monthly doses of vitamin D3. A randomized clinical experiment including nursing home residents looked at this.
we know that for 1 day we need to divide 1.25 by 0.250
so, the answer will be 5 pills per day.
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How many particles are in 64 grams of Oxygen?
Answer:
4
Explanation:
oxygen has molar mass of 16 g/mol. 64 grams / 16 g/mol = 4mol
In the Periodic Table below, shade all the elements for which the neutral atom has an outer electron configuration of ms^2nd^2, where n and m are integers, and m= n+1.
Answer:
Na+e-1=Na
Explanation:
dfh low so to homework all no lol Show
a gallon of iced tea contains 128 fl oz of iced tea. How many l of iced tea in the container
A gallon of iced tea containing 128 fl oz of iced tea contains 3.79 liters of the liquid.
Volume ConversionThe problem here has to do with converting from fl oz to liters.
Recall that:
1 fl oz = 29.6 mL
Thus:
128 fl oz = 29.6 x 128
= 3,788.8 mL
Also recall:
1 mL = 0.001 L
Thus:
3,788.8 L = 3,788.8 x 0.001
= 3.7888 L
In other words, a gallon of iced tea containing 128 fl oz of tea contains 3.79 liters of tea.
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Which statements describe the nature of science? (Select 5)
1. Scientists engage in peer reviews to avoid bias.
2. Science is a blend of logic and innovation.
3. Scientific ideas are not durable and cannot adjust to change as new data is collected.
4. Science is not observational .
5. Science is a complex social endeavor.
6. Natural world is understandable.
7. Scientists try to remain objective.
Answer:
2
Explanation:
Scientists engage in peer reviews to avoid bias, Science is a blend of logic and innovation and Scientific ideas are not durable and cannot adjust to change as new data is collected. The correct options are 1,2, and 7.
Peer reviews are used by scientists to ensure objectivity and reduce prejudice in their study. To create original ideas and hypotheses, scientists need both logical reasoning and creative thinking.
As scientists frequently interact, exchange ideas, and build on one another's work, it is a complex social endeavour. Understanding and making sense of the natural world is the central tenet of science.
Finally, scientists separate their personal beliefs from empirical evidence in order to stay as objective as possible in their research.
Thus, Scientists engage in peer reviews to avoid bias, Science is a blend of logic and innovation and Scientific ideas are not durable and cannot adjust to change as new data is collected. The correct options are 1,2, and 7.
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Water (2450 g ) is heated until it just begins to boil. If the water absorbs 5.35×105 J of heat in the process, what was the initial temperature of the water?
Express your answer with the appropriate units.
The initial temperature of water is 47.8⁰C
In this case, the challenge is to determine how much heat is required to bring a particular sample of water from its original temperature to its boiling point.Given,
mass of water is 2450g
absorbed heat is 5.35×105 J
we have to find out initial temperature
First Calculate the change in temperature when 5.35×10^5 J of heat is provided to 2450g of water.
q = m . c . ∆T
q is amount of heat gained
m is the mass of water
c is the specific heat of the substance
∆T is change in temperature
Specific heat of water is 4.18 J/g⁰C
∆T = q / m . c
= 5.35×10^5 / 2450 × 4.18
= 52.2⁰C
Now we know that the final temperature of the water is
100⁰C and that this final temperature is 52.2⁰C
is higher than the initial temperature of the water.
So by, ∆T = T(f) - T(i)
T(i) = T(f) - ∆T
T(i) = 100⁰C - 52.2⁰C
= 47.8⁰C
Therefore, initial temperature of water is 47.8⁰C
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I
Based on the information below, which of the following are atoms of the same element? (mark all that apply)
Atom A
Atom B
Atom C
8 protons
8 neutrons
8 electrons
10 protons
10 neutrons
10 electrons
8 protons
10 neutrons
8 electrons
end
Based on the information below . The atoms of the same element are Atom A and Atom C .
Atoms of same element have the same atomic number. so the number of protons and electron are same but they have different atomic masses called as Isotopes. so, the atoms having different number of neutron will have different masses.
In the given case ,
Atom A Atom B Atom C
8 protons 10 protons 8 protons
8 neutrons 10 neutrons 10 neutrons
8 electrons 10 electrons 8 electrons
so, In Atom A and Atom C , the number of protons and electrons are same but the have different atomic masses means having different no. of neutrons. so Atom A and Atom C are the atoms of same elements.
Hence,Based on the information below . The atoms of the same element are Atom A and Atom C.
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What is the number of C atoms in 0.247 mol of C.
The number of C atoms in 0.247 mol of C is 1.48 X 10²³ .
The number of C atoms in 1 mol of C is 6.02 X 10²³, which is also called Avogadro’s number .
so, The number of C atoms in 0.247 mol of C is _
0.247x6.02x10²³= 1.48 X 10²³.
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Kate gathered three boxes of the same size made of different materials: glass, clear plastic, and aluminum painted black. She placed them on a window sill in the sun for an hour and then measured the warmth of the air in each box.
In this experiment, what is the warmth of the air?
A. an independent variable
B. a constant
C. a control
D. a dependent variable
The warmth of the air in the experiment conducted by Kate is the dependent variable.
What is dependent variable?In an experiment, the dependent variable is the variable that is measured or recorded by the experimenter.
On the other hand, the independent variable is the variable that is manipulated or changed by the experimenter.
According to this question, Kate gathered three boxes of the same size made of different materials: glass, clear plastic, and aluminum painted black. She placed them on a window sill in the sun for an hour and then measured the warmth of the air in each box.
This suggests that the warmth of the air in the experiment conducted by Kate is the dependent variable.
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PLS HELP ASAP
(50 POINTS)
What is the chemical formula for ethanol according to this
illustration?
Answer: The answer is D [tex]C_{2} OH_{6}[/tex]
Explanation: Because I just know by counting the letters to see how many of each one.
Answer:
C2OH6
Explanation:
The figure shows the presence of...
Two Carbon (C)
One Oxygen (O)
and Six Hydrogen (H)
We need to make sure we select the option that best represents all of the elements shown in the figure.
Because option 4: C2OH6 is the only chemical formula to include all the elements displayed, it is the best answer.
Plan an investigation to explore the relationship between properties of substances and
the electrical forces within those substances.
Approximately 50 minutes
I
What can properties of substances tell us about the electrical forces within those
substances?
In this activity, you will plan and conduct an investigation to compare a single property
across several substances. You must select a measurable property, such as boiling point
or surface tension. After your investigation, you will compare the results and use your
data to make inferences about the strength of the electrical forces in each substance you
tested.
The physical and chemical properties of a compound is dependent upon its bond strength. Physical properties such as boiling, melting point etc . increases with bond strength. Solubility decreases with increase in bond strength.
What is bond strength?The bond strength of a molecule or compound is the measure the energy to break or form the bond. That it tells how much strong the bond is. It directly proportional to the bond order.
Boiling point of a compound is the temperature at which the compound changes from liquid to gas state. Melting point is the temperature at which a to liquid form. All these phase changes are dependent on the electrical force within the molecules.
As the electrostatic force of attraction increases, more energy have to be applied to it to weaken the bonds and make the molecules apart. Therefore, the boiling point and melting point increases.
Similarly the molecules with higher bond strength have less solubility at normal conditions. The reactivity of molecules decreases as their bond strength increases since more energy needed to break the bonds.
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Please and thank you
Answer:28, 34, 85, 6.6
Explanation:
Can anyone help me with this?
Answer:
Student A's Date was more precise.
Explanation: Her answers are closer together whereas student B's answers are further apart in numbers.
In an experiment ,25 ml of 3.7 molal of HCl, HCl solution has density of 1.20 g/ml and react with 10 g zinc to form zinc chloride and hydrogen gas was liberated.
a)Determine the molarity of HCl.
b) the percentage yield if 10.35 g of zinc chloride was obtained
a) 3.04 M
b) 11.5%
In an experiment ,25 ml of 3.7 molal of HCl, HCl solution has density of 1.20 g/ml and react with 10 g zinc to form zinc chloride and hydrogen gas was liberated.
From the above statement we have got a eqauation
Zn+2HCl → ZnCL2+H2
now from the equation , we have found that
2 moles of HCl gives 1 mole of zinc chloride
now:
a) the molarity of HCl.
Here the density given, from it we can find the volume of HCl solution
d=m/v
v=m/d
v=36.5/1.20 = 30.4 ml
from the formula
M1V1=M2V2
here M stands for Molarity and V stands for Volume
M1=3.7M V1 = 25ml
M2 = ? V2 = 30.4 ml
Now put all the values in equation
M2 = M1×V1 ÷V2
M2 = 3.7×25÷30.4
M2 = 3.04 M
b) he percentage yield if 10.35 g of zinc chloride was obtained
now, from the above equation we know 2 moles of HCl gives 1 mole of zinc chloride
then,
% yield of ZnCL2 = [tex]\frac{given mass }{molecular mass}[/tex] × 100
now puttin the values
% yield of ZnCL2 = 10.35×100÷100.9
% yield of ZnCL2=11.5%
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The periodic table is aanged by various patterns is there a pattern with regard to ionic charge? In three to five sentences, explain your reasoning and provide specific examples.
Answer: As you move down the column in the periodic table the ionic charge increases.
Explanation: This is because the effective nuclear charge (Z_sub_eff) provides a shielding constant so that the nuclear charge from the protons cannot interfere with the negative nuclear force of the electrons.
Yes, ionic charge patterns exist. Elements in the same group often share similar charges due to common valence electron configurations.
Indeed, a pattern emerges in terms of ionic charges within the periodic table. Elements within the same group (vertical columns) often exhibit similar ionic charges due to sharing common valence electron configurations.
For instance, Group 1 elements tend to form +1 cations (e.g., Na⁺, K⁺) by losing their single valence electron, while Group 2 elements form +2 cations (e.g., Mg²⁺, Ca²⁺) by losing two valence electrons. Similarly, elements in Group 17, known as halogens, commonly form -1 anions (e.g., F⁻, Cl⁻) by gaining one electron to achieve a stable electron configuration.
This recurring trend can be attributed to the desire of atoms to achieve a full valence shell, either by losing or gaining electrons, leading to predictable ionic charges within specific groups of elements.
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Belching (burping) cows give off much of the methane, a greenhouse gas, from raising farm animals. Now researchers are investigating a way to reduce the greenhouse gas that is burped by cows.
In one study, scientists fed a group of dairy calves (which are cows that produce milk) a methane-blocker chemical. Sensors at feeding stations measured methane in the cows’ gas while the animals were nearby. That allowed the team of researchers to estimate the methane being belched (burped) out each day.
Over their first year of life, the treated cows, which received the methane-blocker chemical, released about ten percent less methane than the group of cows not given the chemical.
What can you infer or conclude based on the evidence from the passage?
*Your response should include the evidence to support your conclusion.
Cows and other ruminants are significant producers of the greenhouse gas methane—contributing 37 percent of the methane emissions resulting from human activity.
What is greenhouse gas?Greenhouse gases (also known as GHGs) are gases in the earth's atmosphere that trap heat. During the day, the sun shines through the atmosphere, warming the earth's surface. At night, earth's surface cools, releasing heat back into the air. But some of the heat is trapped by the greenhouse gases in the atmosphere.
While carbon dioxide is typically painted as the bad boy of greenhouse gases, methane is roughly 30 times more potent as a heat-trapping gas. As temperatures rise, the relative increase of methane emissions will outpace that of carbon dioxide from these sources, the researchers report.
The cow's ramen is like a large fermentation vat. More than 200 different bacteria and 20 types of protozoa help the cow to utilize fibrous feed stuffs and non-protein nitrogen sources. Bacteria adhere to the feed and gradually digest the fermentable material.“You can probably reduce methane by about 20-25% by altering diet,” he says.
One study by researchers at the University of California, Davis, estimated it might be possible to reduce global methane emissions from cows by 15% by changing their diet.
Thus, this evidence support the passage.
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What law says the total amount of
substance at the beginning of a
reaction must match the amount of
substance at the end of the reaction?
A. Law of Conservation of Energy
B. Law of Conservation of Moles
C. Law of Conservation of Heat
D. Law of Conservation of Mass
Answer:
d) law of conservation of mass
Explanation:
PLEASE HELP ILL MARK BRAINEST!!! 35 POINTS!! THANK YOU
This chart above compares the reaction rate of a naturally occurring chemical reaction vs. the same reaction when an enzyme is involved.
a. Compare the differences between the two reactions, but also note what they have in common.
b. Explain the role the enzyme plays in the second reaction
c. Explain what the three bumps in the second reaction means and why the original reaction only has one bump.
In the image given, the difference in the activation energy is observed on addition of a catalyst in the same reaction.
Activation energy is the minimum initial energy needed for a reaction to start. It is denoted as [tex]E_a[/tex].
a) The difference between the reactions is that on addition of a catalyst, the activation energy is reduced to form the same product.
The similarity is that these peaks are basically the transition states where the energy is highest, and the reactant molecules are highly unstable and immediately get converted to the products.
b) Enzymes in the second reaction are the catalysts which increase the rate of the reaction and reduce the activation energy required for the reaction to happen. Not only do the enzymes reduce the activation energy, but they also introduce a multiple energy reaction pathway which must be fulfilled in order to form the products.
c) The second reaction is a multi-step reaction and occurs in a series of collisions, where each collision produces an intermediate molecule which collides further until the final product molecules are formed. Thus, each collision step has its own activation energy peak.
The original reaction has only one activation energy peak as the reactants collide once and form the products immediately thereby consuming a lot of energy.
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What phase of matter is shown here
Answer:
air
Explanation:
Antifreeze has a density of 0.79 g/mL. What mass of antifreeze, in grams, is required to fill a 2.5
gallon car radiator?
Note: 1 gallon = 3.785
The mass of antifreeze required to fill a 2.5 gallon car radiator is
Since, 1 gallon = 3.785 L
2.5 gallon = 9.4625 L
Given,
Gasoline = 9.4625 L x 1000 mL/L
= 9462.5 mL
Density = 0.79 g/mL
Mass = Density x volume (density = mass )
Mass = 0.79 g/mL x 9462.5 mL volume
Mass = 7475.37 g
Therefore,
Mass of antifreeze, in grams = 7475.37 g
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What's a fear, concern, or worry you have? How can you best prepare to tackle this obstacle? (Write 2 to 3 complete sentences) ¿Qué miedo, preocupación o preocupación tienes? ¿Cómo puedes prepararte mejor para enfrentar este obstáculo? (Escribe de 2 a 3 oraciones completas)
Ayuda plis.
Answer:
I'm worried about going to college and living in a dorm. I'm currently keeping in touch with my roommates to know what kind of people they are. Also, I'm starting to pack and get ready to move to my dorm.
Explanation:
Calculate the formula mass of sodium sulfate decahydrate, Na2SO4⋅10H2O , in atomic mass units (amu or u).
Answer:
Na
2
SO
4
.10H
2
O
=(2×23)+32+(4×16)+(10×18)
=46+32+64+180
=322
Convert the following temperature to kelvin:a) 113°C, the melting point of sulfur,b) 37°C, the normal body temperature,c) 357°C, the boiling point mercury.
The temperature to kelvin at 113°C is 386.15 K, at 37°C is 310.15 K and at 357°C is 630.15 K.
Equation :To find Kelvin use formula,
Kelvin = 273.15 + degree Celsius
So,
(a) The melting point of sulfur at 113 degree Celsius
273.15 + 113 = 386.15 K
(b) The normal body temperature at 37 degree Celsius
273.15 + 37 = 310.15 K
(c) The boiling point of mercury at 357 degree Celsius
273.15 + 357 = 630.15 K
What is temperature?Temperature is a measure of hotness and coldness that can be expressed on a variety of scales, including Fahrenheit and Celsius. Temperature indicates the direction in which heat energy will flow from a hot body to a colder body to a lower temperature.
The total energy of the molecular motion inside the object is represented by the heat open object. Temperature is a measure of the thermal energy or average heat of a substance's molecules.
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The ____ chemist would study how fast nitrogen and hydrogen form
Answer:
The Bio chemist would study how fast nitrogen and hydrogen form ammonia.
Explanation:
A structural model of adrenaline is shown below. How many hydrogen atoms
are in adrenaline?
О A. 16
B. 3
О с. 13
D. 4
ОН
pre
ОН
НО
The number of hydrogen atoms in a molecule of adrenaline is 13 (option C).
What is adrenaline?Adrenaline is a hormone naturally produced in human body, however, it is a chemical compound made up of atoms of different elements.
The elements that make up a molecule of adrenaline are as follows:
CarbonHydrogenOxygenNitrogenAccording to this question, a structural configuration of adrenaline is attached. The number of atoms of the elemental constituent of adrenaline is given below:
9 Carbon atoms 3 Oxygen atoms1 Nitrogen atoms13 Hydrogen atomsTherefore, the number of hydrogen atoms in a molecule of adrenaline is 13.
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List three possible reasons why Zara cannot see any cells.
Zara is examining some animal cells on a slide using a microscope. She is aware that there are animal cells on the slide, but she is unable to see any cells when using the microscope. Give three reasons why Zara might not be able to notice any cells.
Understanding organelles has been greatly aided by microscopes. Most organelles cannot be seen using a light microscope, and those that can (such as the nucleus, mitochondria, and Golgi) cannot be studied in detail because of their size, which is near to the light microscope's resolution limit.
The other cell organelles are too tiny and do not adhere to the dye to be visible under a lab microscope.
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Which of the following are mixtures?
calculate the volume in (L) of 1.13x10^5 grams of liquid sodium which has a density of 0.929g/cm3
The volume of the liquid sodium is 121.64 L
What is density?The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as
Density = mass / volume
With the above formula, we can obtain the volume of the liquid. Details below
How to determine the volume of the sodium liquidMass of liquid = 1.13×10⁵ gDensity of liquid = 0.929 g/cm³Volume of liquid =?Density = mass / volume
Thus,
Volume = mass / density
Volume of liquid = 1.13×10⁵ / 0.929
Volume of liquid = 121636.17 cm³
Divide by 1000 to express in liter
Volume of liquid = 121636.17 / 1000
Volume of liquid = 121.64 L
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Question 5 (1 point) Which statement is NOT TRUE about molecules and compounds? a All molecules and compounds are made of atoms. b Compounds are made up of the same type of atom. c All molecules are compounds. d Molecules are made up of two or more chemically bonded atoms.
All molecules are not compounds. Option C.
What are compounds?A compound is a substance made from two or more atoms of different elements that are linked together by bonds. The bond could be an ionic, covalent, metallic, or hydrogen bond.
A molecule, on the other hand, is a group of atoms, the same or different, chemically bonded together and represents the smallest fundamental unit that can participate in chemical reactions.
Going by these two definitions, one can conclude that while all compounds are molecules, not all molecules are compounds. If the group of atoms that bond together is chemically identical, a molecule is formed but not a compound.
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