Batteries come in all shapes and sizes, and depending on the type of battery, the minerals that compose them are mainly lithium, cobalt, graphite, nickel and manganese.
Most chemical reactions release energy or are exothermic. However, some reactions, such as some decompositions, absorb energy. These reactions can be best explained by which of these? A) Energy is destroyed in the chemical reaction. B) The products have less energy stored in their chemical bonds. C) The products have more energy stored in their chemical bonds. D) The reactants have the same energy stored in their chemical bonds.
Answer:
C) The products have more energy stored in their chemical bonds.
Explanation:
In such reactions that absorb energy, the products have more energy stored in their chemical bonds.
For endothermic changes, heat is absorbed from the surrounding hence the surrounding becomes colder at the end of the changes.
The heat energy level of the products is higher than that of the reactants.
Exothermic reactions releases heat to the surroundings. The sum of heat contents of the products is less than that of the hat contents of the reactants. Examples of such processes are burning and dissolution.a) Find the gas speed of ethane at 200.0 degrees Celsius. ____________
b) What is the rate of effusion of ethane (C2H6) compared to hexane (C6H14) gas at the same temperature? _________________
a. 627.1 m/s
b. the rate of effusion of ethane = 1.7 faster than hexane
Further explanation
Given
T = 200 + 273 = 473 K
Required
a. the gas speed
b. The rate of effusion comparison
Solution
a.
Average velocities of gases can be expressed as root-mean-square averages. (V rms)
[tex]\large {\boxed {\bold {v_ {rms} = \sqrt {\dfrac {3RT} {Mm}}}}[/tex]
R = gas constant, T = temperature, Mm = molar mass of the gas particles
From the question
R = 8,314 J / mol K
T = temperature
Mm = molar mass, kg / mol
Molar mass of Ethane = 30 g/mol = 0.03 kg/mol
[tex]\tt v=\sqrt{\dfrac{3\times 8.314\times 473}{30} }=627.1~m/s[/tex]
b. the effusion rates of two gases = the square root of the inverse of their molar masses:
[tex]\rm \dfrac{r_1}{r_2}=\sqrt{\dfrac{M_2}{M_1} }[/tex]
M₁ = molar mass ethane =30
M₂ = molar mass hexane = 86
[tex]\tt \dfrac{r_1}{r_2}=\sqrt{\dfrac{86}{30} }=1.7[/tex]
the rate of effusion of ethane = 1.7 faster than hexane
Help please!!
The half life of lutetium-117 is 6.75 days.
Calculate the percentage remaining after 27 days.
Answer:
6.25%
Explanation:
Given data:
Half life of lutetium-117 = 6.75 days
Percentage remaining after 27 days = ?
Solution;
Number of half lives = Time elapsed / half life
Number of half lives = 27 days / 6.75 days
Number of half lives = 4
At time zero = 100%
At first half life = 100%/2 = 50%
At second half life = 50%/2 = 25%
At 3rd half life = 25%/2 = 12.5%
At 4th half life = 12.5%/2 = 6.25%
help! why are chemical equations always balanced?
Answer:
C
Explanation:
The Law of Conservation of Mass states that matter cannot be created or destroyed and must be conserved. I is stating matter cannot be created, which is true. II is saying that matter can only be rearranged/conserved, which again is true. III states matter cannot be destroyed, which is also true. IV is incorrect because it doesn't make sense. Matter does matter.
The first order reaction,so2cl2 to so2+cl2,has a half life of 8.75 hours at 593k.How long will it take for the concentration of so2cl2 to fall to 12.5% of its initial value? 6.24hours 26.2hours 16.2hours 22.6hours
Answer: The time after which the concentration of [tex]SO_2Cl_2[/tex] fall to 12.5% of its initial value is 26.2 hours
Explanation:
Expression for rate law for first order kinetics is given by:
[tex]t=\frac{2.303}{k}\log\frac{a}{a-x}[/tex]
where,
k = rate constant
t = age of sample
a = let initial amount of the reactant = 100
a - x = amount left after decay process = 12.5
a) for completion of half life:
Half life is the amount of time taken by a radioactive material to decay to half of its original value.
[tex]t_{\frac{1}{2}}=\frac{0.693}{k}[/tex]
[tex]k=\frac{0.693}{8.75hour}=0.0792hour^{-1}[/tex]
b) for concentration to fall to 12.5 % of initial value
[tex]t=\frac{2.303}{0.0792}\log\frac{100}{12.5}[/tex]
[tex]t=26.2hours[/tex]
The time after which the concentration of [tex]SO_2Cl_2[/tex] fall to 12.5% of its initial value is 26.2 hours
How many grams of zinc oxide can be produced from 7.3 moles of oxygen? *
2Zn + O2 → 2Zno
1188.13 g Zno
81.379 g Zno
7.3 g Zno
O 2g Zno
Answer:
Mass = 1188.13 g
Explanation:
Given data:
Mass of ZnO produced = ?
Moles of oxygen = 7.3 mol
Solution:
Chemical equation:
2Zn + O₂ → 2ZnO
Now we will compare the moles oxygen and and ZnO.
O₂ ; ZnO
1 : 2
7.3 : 2/1×7.3 = 14.6 mol
Mass of ZnO:
Mass = number of moles × molar mass
Mass = 14.6 mol × 81.38 g/mol
Mass = 1188.13 g
Which solution would have the highest boiling point? A. 1.3 m ammonium sulfide (aq) B. 2.0 carbon tetrachloride (aq) C. 1.5 m copper (II) sulfate(aq) D.2.2 m sucrose (aq)
Answer:
C. 1.5 m copper(II) sulfate(aq)
Explanation:
I say this because a copper is a metal and a metal always has the highest melting and boiling point. A metal is also malleable, can dissolve in water, and a good conductor of electricity. All the other answers have all the nonmetals in them like Carbon, Oxygen, Chlorine, and etc. Nonmetals do not have a high boiling point. They basically are brittle. Therefore, the final answer is C.
How many moles of carbon are in 5.25 g sucrose? How many moles of hydrogen? How many moles of oxygen?
Answer:
63 moles of carbon atoms, 115.5 moles of hydrogen atoms, and 57.75 moles of oxygen atoms i believe :)
How are you able to see cells?
With contemporary light microscopes.
Answer:
Contemporary light microscopes are able to magnify objects up to about a thousand times. Since most cells are between 1 and 100 μm in diameter, they can be observed by light microscopy, as can some of the larger subcellular organelles, such as nuclei, chloroplasts, and mitochondria.
Aqueous solutions of potassium chloride and silver nitrate are mixed.
Write the balanced net ionic equation
Answer:
Sorry how no this equation guys
In your opinion, should scientists clone the wooly mammoth? Explain why or why not.
Answer:
I think scientists should not clone the wooly mammoth because our environment is already working great without them and bringing them back has a chance to hurt the environment or even destroy it also wooly mammoths were exists about 3700 years ago and the world had changed A LOT from then so we could end up hurting the mammoth by putting it in a world that has changed a lot from when the wooly mammoth was actually alive.
Calculate the mass of hydrogen in 57.010 grams of ammonium hydrogen phosphate. Use dimensional analysis.
Answer:
4.59 grams of hydrogen
Explanation:
57.010 g of ammonium phosphate * 1 mol / 149 g of ammonium phosphate * 12.0 g H * / 1 mol = 4.591409396.
But with sig figs, it rounds to 4.59.
So the final answer is 4.59 grams of hydrogen.
4.59g is the mass of hydrogen in 57.010 grams of ammonium hydrogen phosphate. A mole is just a measuring scale.
What is mole?A mole is just a measuring scale. In reality, it is one of the International System for Units' seven foundation units (SI). When already-existing units are insufficient, new ones are created. Using absolute amounts of atoms, molecules, or ions would be problematic as well since chemical reactions frequently occur at levels that use grams would be inappropriate.
A mole consists of precisely 6.022140761023 particles. The "particles" might be anything, from tiny things like electrons and atoms to enormous things like stars or elephants.
57.010 g of ammonium hydrogen phosphate× 1 mol / 149 g of ammonium phosphate ×12.0 g H× / 1 mol = 4.59g of hydrogen
Therefore, 4.59g is the mass of hydrogen in 57.010 grams of ammonium hydrogen phosphate.
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Explain why the available amount of water per person differs between countries.
Answer:
It's considered a limited resource because there is a limited amount of freshwater found on Earth's surface. Explain why the amount of water per person differs between countries. It differs because in the different countries it is distributed unevenly.
Explanation:
looked it up
a) Find the gas speed of ammonia at 25.0 degrees Celsius. ______________
b) What is the rate of effusion of ammonia compared to silicon tetra bromide gas as the same temperature? __________________
a. 661.23 m/s
b. the rate of effusion of Ammonia = 4.5 faster than Silicon tetra bromide
Further explanationGiven
T = 25 + 273 = 298 K
Required
a. the gas speed
b. The rate of effusion comparison
Solution
a.
Average velocities of gases can be expressed as root-mean-square averages. (V rms)
[tex]\large {\boxed {\bold {v_ {rms} = \sqrt {\dfrac {3RT} {Mm}}}}[/tex]
R = gas constant, T = temperature, Mm = molar mass of the gas particles
From the question
R = 8,314 J / mol K
T = temperature
Mm = molar mass, kg / mol
Molar mass of Ammonia = 17 g/mol = 0.017 kg/mol
[tex]\tt v=\sqrt{\dfrac{3\times 8.314\times 298}{0.017} }=661.23~m/s[/tex]
b. the effusion rates of two gases = the square root of the inverse of their molar masses:
[tex]\rm \dfrac{r_1}{r_2}=\sqrt{\dfrac{M_2}{M_1} }[/tex]
M₁ = molar mass Ammonia NH₃= 17
M₂ = molar mass Silicon tetra bromide SiBr₄= 348
[tex]\rm \dfrac{r_1}{r_2}=\sqrt{\dfrac{348}{17} }=4.5[/tex]
the rate of effusion of Ammonia = 4.5 faster than Silicon tetra bromide
Which of the following elements has the same number of valence electrons as aluminum?
zinc
carbon
silicon
magnesium
or boron
Answer:
boron
Explanation:
Boron and aluminum lie in same group in modern periodic table and both have three valence electrons
Match the reaction to the type that best describes it.
Answer:
Answers with detail given below.
Explanation:
1) NaBr + KF → NaF + BrK
Double replacement:
It is the reaction in which two compound exchange their ions and form new compounds.
AB + CD → AD +CB
2) 2Cu + MnCl₂ → 2CuCl + Mn
Single replacement:
It is the reaction in which one elements replace the other element in compound.
AB + C → AC + B
3) CO₂ → O₂ + C
Decomposition reaction:
It is the reaction in which one reactant is break down into two or more product.
AB → A + B
4) C + 2H₂ → CH₄
Combination reaction:
It is the reaction in which two or more simple substance react to give one or more complex product.
Respond to the following prompt
Knowing what you know about photosynthesis, explain how the process may help reduce global warming.
equation invalid?
Al +202
→ A1203
O A. An atom of aluminum (Al) is created in the reaction.
B. An atom of oxygen (O) is destroyed in the reaction.
O C. The equation violates the Law of Conservation of Mass.
O D. All of the above.
1 View Gizmo
Answer:
B. an atom of oxygen o is destroyed in the reaction
Which statement is true of gamma radiation?
A. Gamma radiation can pass through your body
B. Gamma radiation is always dangerous to the body.
C. Gamma radiation is produced when a neutron turns into a preton
D. Gamma radiation cannot go through surfaces rather, it will beures
off them.
Answer: A. Gamma radiation can pass through your body
Explanation:
Let's use the Process of Elimination for this problem.
We will start off with B. Gamma radiation is always dangerous to the body.
Facts: Gamma radiation are not always dangerous to the body. Most of the time, Gamma rays and radiation will go through with little to no effect at all. So, now we know that the answer can not be B. Gamma radiation is always dangerous to the body.
Next, let's check if C. Gamma radiation is produced when a neutron turns into a proton is true.
Facts: Gamma radiation has nothing to do with neutrons turning into protons and protons turning into neutrons. Gamma rays are a type of radiation that is everywhere. Gamma rays do not make neutrons into protons. Now, we will eliminate option C. Gamma radiation is produced when a neutron turns into a proton.
Let's check if D. Gamma radiation cannot go through surfaces rather, it will beures off them is true or not is true or not.
Facts: Gamma rays can enter your body, they do not just bounce off of your body. Gamma rays are invisible and have no weight. They are like lasers and they can enter your body. Now, we know the answer should not be D. Gamma radiation cannot go through surfaces rather, it will beures off them is not a true statement.
Finally, let's check if A. Gamma radiation can pass through your body is true or not.
Facts: Gamma rays can pass through your body because it is like a natural laser. They can also cause ionizations that can damage tissue in your body. But most of the time, the damage to your tissue is minor. So, we know A. Gamma radiation can pass through your body is a true statement.
Therefore, we got our answer. A. Gamma radiation can pass through your body is the correct option.
Which type of molecule is shown below?
A. Alcohol
B. Ester
C. Amine
D. Ketone
Answer:
Ketone molecule
Explanation:
The type of molecule shown above is ketone molecule.
What is molecule?A molecule is a group of two or more atoms that are chemically combine together or are tightly held together by attractive forces.
What is ketone?A ketone is an organic compound in which the carbonyl group is attached to a carbon atom within the carbon chain. The general formula for a ketone is RC(=O)R' where R and R' are alkyl or aryl groups.Hence, we can conclude that option D is the answer.
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question shown in picture tysm!!!
Answer:
the answer is the second one.
How many grams do 3.6 × 10^20 atoms of sodium weigh?
Answer in units of g.
Second time posting as someone else answered incorrectly.
Answer:
13.749 x 10 -3 g
Explanation:
take the number of atoms that you have divided by Avogadro's number and then multiply by the molar mass of the element. :)
if you push a crate with 50N of force for 10 meters in 5 seconds how much power dis u use
Answer:
Hi... Your answer is 10*50=500
Answer:
50x10 = 500 ; 500/5 = 100 watts
Explanation:
W/t /Force x Distance
the power is equal to the work done to the object divided by time.
ASAP HELPPP PLZZ I WILL GIVE BRAINLIEST
Ocean currents contribute to global climates and occur due to differences in temperature, salinity, and density. WHY do you THINK these differences can cause currents to form?
plzzzz
Answer:
The rise and fall of the tides. Tides create a current in the oceans, which are strongest near the shore, and in bays and estuaries along the coast.
Winds drive currents that are at or near the ocean's surface.
Thermohaline circulation. This is a process driven by density differences in water due to temperature (thermo) and salinity variations in different parts of the ocean. Currents driven by thermohaline circulation occur at both deep and shallow ocean levels and move much slower than tidal or surface currents.
Currents affect the Earth's climate by driving warm water from the Equator and cold water from the poles around the Earth.
Explanation:
hope this helps
1. Freon (CCl2F2) is commonly used in refrigerators and air conditioners as a coolant. How many grams of fluorine are there in the 2.00 lbs of Freon necessary for an air conditioner? (1 lb = 454 g)
Answer:
285g of fluorine
Explanation:
To solve this problem we need to find the mass of Freon in grams. Then, with its molar mass we can find moles of freon and, as 1 mole of Freon, CCl₂F₂, contains 2 moles of fluorine, we can find moles of fluorine and its mass:
Mass Freon:
2.00lbs * (454g / 1lb) = 908g of Freon
Moles freon -Molar mass: 120.91g/mol- and moles of fluorine:
908g of Freon * (1mol / 120.91g) =
7.5 moles of freon * (2moles Fluorine / mole Freon): 15 moles of fluorine
Mass fluorine -Atomic mass: 19g/mol-:
15 moles F * (19g / mol) =
285g of fluorineWho can help me fill in the blanks?
Answer:
elllo
Explanation:
Arrange the following atoms in order of decreasing atomic radius: Ga,As,Sn,Sb,Te
Answer:
Sn, Sb, Te, Ga, As
Explanation:
which statement describes the movement of carbon dioxide in the carbon cycle?
A. The gas leaves the biosphere as animals breathe in air.
B. The gas leaves the atmosphere as plants use it to make sugar.
C. The gas enters the cryosphere as ice sheets melt.
D. The gas enters the hydrosphere as sugar dissolves in water.
Answer:
C. The gas enters the cryosphere as ice sheets
Answer:
D
Explanation:
which expression has a value of 10
A. (10+10)/5-3
B. (10+10)/(5-3)
C. (10+10/5)-3
D. 10+10/(5-3)
(math)
Describe what happens to particles of matter as you cool the matter to absolute zero (0 K). In your description, be sure to explain the changes in kinetic energy and particle motion.
Answer:
the particles expand and the kinetic energy i think moves slower
Explanation:
Answer:
Absolute zero is the temperature at which the particles of matter (molecules and atoms) are at their lowest energy points. Some people think that at absolute zero particles lose all energy and stop moving. This is not correct. ... Scientists use lasers to slow atoms when cooling objects to very low temperatures.