Answer:
2.00 M
Explanation:
The formula mass of aluminum oxide is 2(27)+3(16)=102 g/mol.
So, there is 1 mole of solute in 500 mL=0.5 L of solution
Now, we can use the equation molarity = (moles of solute)/(liters of solution)
molarity = 1/0.5 = 2.00 MQuestion 29 of 32
Why does a scientist form a hypothesis?
A. To prove a theory
B. To explain the data that are collected from an experiment
C. To explain his or her opinion about an observation
D. To provide a statement that can be tested with an experiment
A scientist form a hypothesis because he wants to : (D). To provide a statement that can be tested with an experiment
Meaning of hypothesisA hypothesis can be defined as a statement that is proposed by a scientist and needs to be tested by other scientist.
So in a simple statement, hypothesis in its raw state is an untested and unproven fact that is propagated by a scientist.
In conclusion, a scientist form a hypothesis because he wants to : To provide a statement that can be tested with an experiment
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the granite sample has a mass of 24.31 g and a volume of 9.35cm3. what is the density of the granite?
the density is 2.6 g/mL
Explanation:
you divide 24.31 by 9.35 and end up with 2.6111707841, just round it off to 2.6
The density is 2.6 g/mL of granite.
What is density?
Density is defined as the mass per unit volume it means that mass present in 1 meter cube is called density. The S.I unit of density is kg/m^3 and in C.G.S it is gram/cm^3.
So In above statement we can understand that density, mass, and volume all are convert to each other it means that if we know any two variable then third one will be calculated easily.
Mathematically,
Formula for density will be as mentioned below:-
Density = Mass/Volume.
From above formula we can calculate mass which is as follows:-
Mass = Volume × Density.
S.I unit of mass is kilograms and C.G.S unit is gram.
And similarly we can calculate the volume which is equal to as follows:-
Volume = mass / density.
S.I unit of volume is meter cube and C.G.S unit is cubic centimeter. Density is defined as the mass per unit volume it means that mass present in 1 meter cube is called density.
From above formula we can calculate mass which is as follows:-
Mass = Volume × Density.
S.I unit of mass is kilograms and C.G.S unit is gram.
Therefore, The density is 2.6 g/mL of granite.
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For a given reaction, the activation energy is 63. 9 kj/mol. If the reaction rate constant is 4. 1 × 10–3 m–1s–1 at 32. 0ºc, what is the reaction rate constant at –5. 0 ºc? (r = 8. 314 j/k⋅mol)
The reaction rate constant at –5. 0 ºc is k2 is 24.3 KJ.
What is the activation energy?Activation energy is the minimum amount of energy required to carry out a reaction.
The formula is [tex]log \dfrac{k_2}{k_1} = \dfrac{Ea}{2.3R} \;( \dfrac{1}{T_1}- \dfrac{1}{T_2} )[/tex]
Given, K1 is [tex]4. 1 \times 10^3 m^-^1 s^-^1[/tex]
Temperature is 32
k2 is to find?
r = 8.314
Energy is 63.9
[tex]log \dfrac{k_2}{4. 1 \times 10^3 } = \dfrac{63.9 }{2.3\times 8.31} ( \dfrac{1}{32.0}- \dfrac{1}{-5.0} ) = 24.3 kj[/tex]
Thus, the correct option is k2 is 24.3 kJ
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Consider a 1.0-L sample of helium gas and a 1.0-L sample of argon gas, both at room temperature and atmospheric pressure. Do the atoms in the helium sample have the same average kinetic energy as the atoms in the argon sample
Yes, the atoms in the helium sample have the same average kinetic energy as the atoms in the argon sample.
What is Average Kinetic Energy ?The average kinetic energy of a gas molecule is defined as the product of half of the mass of each gas molecule and the square of the RMS speed.
The average kinetic energy equation is independent of Molar mass.
It's only a function of temperature.
So if they're at the same temperature they will have the same average kinetic energy.
Therefore, the atoms in the helium sample have the same average kinetic energy as the atoms in the argon sample
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Discuss, how equilibrium shifts in following reaction:
A) 2H2O2(aq) ⇄ 2H2O(l) + O2(s)
B) 3O2(g) ⇄ 2O3(g)?
Both reactions are the examples of reversible reaction and the reaction moves both forward and backward direction.
What happen in the reactions?In the first equation, hydrogen monoxide molecule is broken down into water and oxygen molecule. These two molecules again converted into hydrogen monoxide due to reversible reaction and gets equilibrium.
While on the other hand, in the second equation, oxygen molecule turns into ozone molecule and this ozone molecule again converted into oxygen molecule due to reversible reaction and attains equilibrium.
So we can conclude that both reactions are the examples of reversible reaction and the reaction moves both forward and backward direction.
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Scientists made the following two observations about emission spectra: each element has a unique emission spectrum. atoms emit energy only at specific wavelengths. describe how the bohr model explains both of these observations.
In this model, electrons are found on unique levels and when jumping from one level to another, electrons emit light at a specific wavelength.
What is the Bohr model?The Bohr model is an atomic model describing the properties of atoms and their constituents (electrons).
This model states different atoms have specific levels of energy where electrons can be located.
In conclusion, in this model, electrons are found on unique levels and when jumping from one level to another, electrons emit light at a specific wavelength.
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Answer:
In the Bohr model, electrons can exist only in certain energy levels surrounding the atom. The energy levels in each atom are unique. When electrons jump from a higher energy level to a lower one, they emit light at a wavelength that corresponds to the energy difference between the levels.
Explanation:
Ed22
What mass of Na2CO3 will be required to dissolve in 0.3 L of water to make a 0.5 M solution?
The mass of [tex]Na_2CO_3[/tex] that will be required to be dissolved in water would be 15.9 grams
Solution preparationRecall that: molarity = mole/volume in L
In this case, the volume is 0.3 L and the molarity is 0.5 M.
Thus, mole = molarity x volume = 0.5 x 0.3 = 0.15 moles
Mass of 0.15 moles [tex]Na_2CO_3[/tex] = 0.15 x 106 = 15.9 grams
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6. Which of these are ways that humans are helping endangered animal populations? (Select all that apply.)
requiring a license to hunt
establishing protected preserves
captive breeding
laws to protect endangered species
The ways in which humans are helping endangered animal populations are as follows:
establishing protected preserveslaws to protect endangered speciesWhat are endangered species?Endangered species are species which are in danger of becoming extinct throughout all or a significant portion of its range.
Extinction refers to the non-existence of a particular species of an organism on the Earth.
One of the ways by which a species of animal can become endangered is through indiscriminate poaching, hence, the ways by which humans are helping endangered animal populations are as follows:
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Answer:
b and
Explanation:
which of the following with the kinetic theory address? a
A. Vibrations in molecules
B. Oxidation states of Adams
C. Shapes of molecules
D. Energy levels and electrons
Answer:A
Explanation:
The kinetic molecular theory of matter states that: Matter is made up of particles that are constantly moving. All particles have energy, but the energy varies depending on the temperature the sample of matter is in.This is turn determines shearer the substance exists in the solid, liquid, or gaseous state.
What is the structure of the cytosine base after catalysis by dnmt3a?.
The structure of the cytosine base after catalysis by DNMT is 5'Mecytosine.
What is a cytosine base?Cytosine (C) is one of the four nucleotide bases in DNA, with the other three being adenine (A), guanine (G) and thymine (T).
Methylation of the cytosine base is catalyzed by the enzyme DNA methyltransferase (DNMT), and S-adenosyl methionine (SAM) functions as the methyl group donor.
Hence, the structure of the cytosine base after catalysis by DNMT is 5'Mecytosine.
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PLEASE HELP ANYONE!!
Claim: A small spark can start a huge explosion.
Evidence:
Reasoning:
Answer:
I think a small spark can start a huge explosion because, a spark or a small firework for an example, can start a fire. You don’t want to have a spark or sparkler lit in your house. This is why I think that it could start a fire.
Explanation:
reasoning
My reason is that if you have a lighter, and you lite the sparkler or spark, you will definitely see a flame glowing at the top. One reason for why you need to lite things that could start fires outside is, that it can be deadly if you accidentally leave one inside or somewhere close to your house or a window. Another piece of evidence is one from a movie. This scenario is kind of like the one in a dogs purpose. A dog’s purpose is about how a dog begins there life as a puppy, they eventually end up having to be saved again by their owner but that’s the summary for just the small unimportant parts. But the real reason for why I’m comparing the question to this is because, in the movie, the rising action, is kind of when the dog, gets put to sleep. But after it goes on all different types of adventures both dangerous, boring at times, and then mood changing I think the story is similar to the question because, a adult sets a fire on the house and the owner of the dog and the owners mom have to get out with there dog. The owner that’s a boy or adult boy, has to jump out the window after saving his dog and this is how a small spark can make a huge impact or life changing lesson.
How do potential and kinetic energy work?
Answer:
You now know that potential energy is position relative, and kinetic energy is motion relative. The primary relationship between the two is their ability to transform into each other. In other words, potential energy transforms into kinetic energy, and kinetic energy converts into potential energy, and then back again.Explanation:
don't forget to mark me brainlistcalculate the number of moles of nitrogen monoxide gas used to form 72.0 grams of water vapor.
4 moles of nitrogen monoxide gas used to form 72.0 grams of water vapor.
What is a mole ?A mole is the measurement unit which is used to correlate the molar mass with number of molecules present.
The equation for reaction of Nitrogen monoxide to form water vapor is given by
4NH₃ + 6NO ----> 5N₂ + 6H₂O
72 grams of water vapor means = 72/18 = 4 mole of water vapour
The mole fraction of NO to H₂O is 6 : 6
Therefore for 4 moles of water vapor formation , 4 moles of nitrogen monoxide will be required.
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A solution of sulfuric acid (h2so4) has a concentration of 6.0m. it contains 14.7mol h2so4. what is its volume? reference: m = mol/l
group of answer choices
0.41l
88.2l
none of these are correct.
2.45l
Answer:
V = 0.41L
Explanation:
[tex]c=\frac{n}{V}\\n=cV\\14.7=6.0V\\ \\V=0.41l[/tex]
Some industries require a decrease in the rates of reactions instead of speeding them
up.
1) Name an industry that requires such criteria.
2) How is this possible? Suggest and explain two different ways
Food industries require that reaction rates be lowered and this can be done by addition of preservatives and by freezing food substances.
What is rate of reaction?
The rate of a reaction is a measure of amount of substances converted to products per unit.
Substances that speed up rate of reactions are known as catalysts.
Some catalysts though, reduce or slow down the rate of reactions.
An industry that requires the rate of reactions to slow down is the food industry.
Some methods employed to slow down reaction rates include:
Freezing - lowering temperature reduces rate of reactionsUse of preservatives - preservatives are chemical that inhibit certain organisms and catalysts from acting on foodTherefore, food industries require that reaction rates be lowered and this can be done by addition of preservatives and by freezing food substances.
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How many moles of a gas sample are in a
20.0 L container at 373 K and 203 kPa? The gas constant is 8.31 L - kPa/mol -K.
0.33 mole
0.65 mole
1.30 moles
3.05 moles
The moles of the gas sample present is 1.30 , Option C is the right answer.
What is Ideal Gas Equation ?Ideal Gas Equation states that for an ideal gas , the product of pressure and volume is equal to the product of moles , universal gas constant and the temperature.
PV =nRT
Given in the question
Volume = 20 Litre
T = 373 K
P = 203kPa
R =8.31 L - kPa/mol -K.
Therefore
203 * 20 = n *8.31 *373
n = 1.30 moles
Therefore the moles of the gas sample present is 1.30 .
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Which, if any, of the substances had resonance structures? how many resonance did each substance have?
ccl4
h2o
co2
h2o2
ch4
c2h4
ch2o
ch3oh
ch3nh2
nf3
nh3
[nh4]
[no2]-
so2
of2
h2s
sf6
icl5
The following are the compounds in the list that possesses resonance structures; CO2, [NO2]-, SO2 and OF2
What are resonance structures?Resonance structures tend to arise when a single structure does not account for all the properties of a compound. This is a concept that arose from the valence bond theory.
The following are the compounds in the list that possesses resonance structures; CO2, [NO2]-, SO2 and OF2
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Griffin made the following list of the different outer coverings of a plant. which part of his list is incorrect?
outer coverings of plants
fuzzy hairs
spines
bark
stamen
bark
fuzzy hairs
spines
stamen
Stamen is not an outer covering its the reproductive organ of the plants.
What is use of covering of Plants ?Outer covering of plants is useful in protecting them from environment factors , it is useful in keeping the moisture intact inside the plants.
Among the different outer covering , Bark ,stamen , spines and fuzzy hairs
Bark , stamen and fuzzy hairs are all the outer covering of plants
Stamen is not an outer covering its the reproductive organ of the plants.
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In[7.60x10-³] = In(5.63×10-2) - (k s¯¹)(480 s)
Answer:
I'm not understand that question
I'm so sorry
Four cars travel at the same speed down a road. Their mass and kinetic energy are shown in the graph,
80,000
60,000
40,000
al
20,000
0
500
1,000
1,500 2,000
Mass (kg)
Which statement is true about the kinetic energy of the cars?
OA, Kinetic energy is unrelated to the mass of the cars.
B. Kinetic energy is proportional to the mass of the cars.
Oc. Kinetic energy is proportional to the mass of the cars squared.
OD. Kinetic energy is inversely proportional to the mass of the cars.
Kinetic Energy (1)
Answer:B
Explanation:
What are some skills many CTSOs help their members develop? Select two options.
CTSO is an extracurricular program for students. The program helps the students build leadership qualities and career-specific skills.
What is CTSO?A career and technical student organization is a program designed and implemented for the students to improve their interpersonal relationships, goal setting, and build leadership skills.
CTSO helps in building the skills required for professional career establishment and for the educational purposes that are other than academics. It includes competitions, plays, sports events, etc.
Therefore, CTSO increases leadership skills and provides career-specific skills.
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Answer
the answer to your question is leadership and career-specific skills hope this helps ;)
Explanation:
Leslie incorrectly balances an equation as 2c4h10 12o2 → 8co2 10h2o. which coefficient should she change? 2 8 10 12
[tex]2C_4H_10+13O+2[/tex] → [tex]8CO_2+10H_2O[/tex] is the balanced chemical equation.
Hence, she should change the coefficient to 2, 13, 8, 10.
What is a balanced chemical equation?A balanced equation contains the same number of each type of atom on both the left and right sides of the reaction arrow.
[tex]2C_4H_10+13O+2[/tex] → [tex]8CO_2+10H_2O[/tex] is the balanced chemical equation.
Hence, she should change the coefficient to 2, 13, 8, 10.
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Answer:
Its d
Explanation:
i did the quiz
TRUE OR FALSE
Q1.) Is the distances of the gas molecules are far greater than it's molecule dimensions.?
Q2.) The movement of any gas particle/molecules is directly affected by temperature.?
｡ﾟ(TヮT)ﾟ｡ H-Help me with this pls...,,
Answer:
Q1. False
Q2. True
Explanation:
gas molecules are not that at far than dimensions molecules
An air mattress is filled with 0.55 moles of air. the air inside the mattress has a temperature of 295 k and an absolute pressure of 3.5 kilopascals. what is the volume of the air mattress? the volume of the air mattress is liters.
The volume of the air mattress filled with 0.55 moles of air and has a temperature of 295 k and an absolute pressure of 3.5 kilopascals is 386L.
How to calculate volume?The volume of a gas can be calculated by using the ideal gas law equation as follows:
PV = nRT
Where;
P = pressureV = volumen = number of molesR = gas law constantT = temperature0.0345 × V = 0.55 × 0.0821 × 295
0.0345V = 13.32
V = 386L
Therefore, the volume of the air mattress filled with 0.55 moles of air and has a temperature of 295 k and an absolute pressure of 3.5 kilopascals is 386L.
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Answer:
The answer is 34.2 L.
Explanation:
Ideal Gas Law = PV = nRT
(where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.)
Plug in the known values into the Ideal Gas Law equation:
3.5 kPa * V = 0.55 moles * 8.31 J/mol*K * 295 K
Finally, solve for V:
V = (0.55 moles * 8.31 J/mol*K * 295 K) / 3.5 kPa
= 34.2 L
A woman is deciding between three alarm systems to install in her home. Each alarm system produces a wave with a different wavelength and decibel level, as shown in the following table.
If the woman wants the alarm with the lowest pitch, which alarm should she choose? Explain your answer.
Based on the data in the table, which alarm produces sound waves with the greatest amplitude? Explain your answer.
Write 3–4 sentences identifying which alarm has the lowest pitch and explain why you chose that alarm?
Write 3–4 sentences identifying the alarm that produces a sound with the greatest amplitude and explain why you chose that alarm?
Answer:
Based on the data in the table, which alarm produces sound waves with the greatest amplitude? Explain your answer.
this bit says based on the table but there is no table.
Type the correct answer in the box. Use numerals instead of words.
A copper coin with a mass of 6.30 grams changes temperature in the sunshine from 20.0°C to 32.0°C. How much energy is transferred? The specific heat capacity of copper is 0.377 joules/gram degree Celsius. Express your answer to three significant figures.
The amount of energy transferred to the coin is ???
joules.
28.5 J is the amount of energy transferred to the coin.
What is specific heat capacity?The specific heat capacity is defined as the quantity of heat (J) absorbed per unit mass (kg) of the material when its temperature increases by 1 K (or 1 °C), and its units are J/(kg K) or J/(kg °C).
Energy is calculated mCΔT formula where,
m(mass)= 6.30 grams
C(specific heat capacity)= 0.377 j/g
ΔT(change in temperature)= 32.0°C- 20°C= 12 °C
Energy is, therefore:
Q = mCΔT
Q= 6.30 g x 0.377 j/g /°C x 12 °C
Q= 28.5 J
Hence, 28.5 J is the amount of energy transferred to the coin.
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Answer:
28.5 J is which what is the amount of energy transferred or given to the coin.
Explanation:
Have a great rest of your day
The one and only
Mr. Universe
(03.03 MC)
What best describes the bonding in a carbon dioxide molecule? (5 points)
- Carbon shares two of its electrons, and each oxygen shares four of its electrons.
- Carbon shares four of its electrons, and each oxygen shares two of its electrons.
- Carbon receives two electrons from each of the two oxygen atoms.
- Carbon transfers two electrons to each of the two oxygen atoms.
Answer:
- Carbon shares four of its electrons, and each oxygen shares two of its electrons.
Explanation:
Carbon needs 4 electrons to reach a full outer shell while oxygen needs 2 to reach a full outer shell.
How many moles are in 8.35 g of H2O?
ANS THIS SMALL QUESTION
Which of the following is one of the ending compounds
during cellular respiration?
O Glucose
O Mitochondria
O Oxygen
O Water