CHEMISTRY HIGH SCHOOL

What is one benefit associated with a nuclear fission reaction?(1) The products are not radioactive.
(2) Stable isotopes are used as reactants.
(3) There is no chance of biological exposure.
(4) A large amount of energy is produced.

Answers

Answer 1
Answer: The correct answer is (4) A large amount of energy is produced in a nuclear fission reaction.
Choice (1) is false, the products are radioactive, and often have to be buried underground for long periods of time. Choice (2) is false, because the reactants are often unstable to allow them to decay and release energy. Choice (3) is false, because the radioactive substances can affect living organisms.
Answer 2
Answer: "A large amount of energy is produced" is by far the most associated with a nuclear fission reaction in terms of a benefit, in terms of making both power and bombs. 

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In real life, a given system can approach equilibrium from different starting points but will still have the same equilibrium constant. How is this possible? Explain your answer in complete sentences.

Answers

In real life, a given system can approach equilibrium from different starting points but will still have the same equilibrium constant. It is because the rate of reaction for product formation and reactants forming is the same. It came to a point where their reaction attains equilibrium.

Why does vinegar dissolve in water but oil does not? A. Vinegar is nonpolar like water, but oil is polar. B. Vinegar is a pure substance, but oil is already a mixture. C. Vinegar is polar like water, but oil is nonpolar. D. Vinegar is a mixture, but oil is a pure substance like water.

Answers

The answer is C. Vinegar is polar like water, but oil is nonpolar this is due to the fact that if it dissolves in water it is mostly polar so the third choise represented above is definitely correct one.

Vinegar dissolve in water but oil does not because vinegar is polar like water, but oil is nonpolar and the correct option is option C.

The dissolving process depends on the polarity of the substances involved. Water is a polar molecule, meaning it has a positive and negative end, while vinegar contains acetic acid, which is also polar. Since both water and vinegar are polar, they can mix and dissolve in each other easily.

On the other hand, oil is nonpolar, meaning it lacks a positive and negative end. Because of this, oil cannot dissolve in water, which is polar. Instead, oil and water will separate into distinct layers. This phenomenon is due to the "like dissolves like" rule, where polar substances dissolve best in polar solvents and nonpolar substances dissolve best in nonpolar solvents.

Thus, the ideal selection is option C.

Learn more about Polar and nonpolar substances, here:

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How many grams of magnesium oxide can be produced when 97.2 g Mg react with 88.5 g O2?

Answers

First we establish the chemical reaction equation. 
2Mg + O2 = 2MgO. 
Then we need to know which of the reactant is limiting. We do that by multiplying the number of moles of reactant to the stoichiomeric coefficient. For Magnesium: 97.2 g* (mol)/(24g) *2 = 8
For O2: 88.5g*(mol)/(32g) *1 = 2.7
Since O2 has the smaller moles, this is the Limiting reactant. Then we solve basing on the number of O2 used. 

88.5g* (mol)/(32g) * (2)/(1) * (56g)/(mol) = 309.75 g

Answer : The mass of magnesium oxide produced will be, 161.2 g

Solution : Given,

Mass of Mg = 97.2 g

Mass of O_2 = 88.5 g

Molar mass of Mg = 24.3 g/mole

Molar mass of O_2 = 32 g/mole

Molar mass of MgO = 40.3 g/mole

First we have to calculate the moles of Mg and O_2.

\text{Moles of Mg}=\frac{\text{Mass of Mg}}{\text{Molar mass of Mg}}=(97.2g)/(24.3g/mole)=4\text{ moles}

\text{Moles of }O_2=\frac{\text{Mass of }O_2}{\text{Molar mass of }O_2}=(88.5g)/(32g/mole)=2.7\text{ moles}

The balanced reaction is,

2Mg+O_2\rightarrow 2MgO

As, 2 moles of Mg react with 1 moles of O_2

So, 4 moles of Mg react with (4)/(2)=2 moles of O_2

From this we conclude that the O_2 is in excess amount and Mg is in limited amount.

Now from the reaction we conclude that

As, 2 moles of Mg react to give 2 moles of MgO

So, 4 moles of Mg react to give 4 moles of MgO

Now we have to calculate the mass of MgO.

\text{Mass of MgO}=\text{Moles of MgO}* \text{Molar mass of MgO}

\text{Mass of MgO}=(4moles)* (40.3g/mole)=161.2g

Therefore, the mass of magnesium oxide produced will be, 161.2 g

Which of the following an inorganic compound?CH3(CH2)3CH3 pentane
C6H12O6 glucose
C4H10 butane
H2O water molecule

Answers

An organic compound is one which consists of a chain of carbon atoms with other atoms bonded to the chain.

Pentane has 5 carbon atoms with surrounding hydrogens.
glucose is a chain of 6 carbon atoms
butane is similar to pentane

water has no carbon atoms, and the central atom is oxygen ---> therefore it is inorganic!

4. HOW MANY MOLECULES ARE IN 1.5 MOL OF SULFUR TRIOXIDE?

Answers

Sulfur trioxide is SO3
Now to find number of particles we take number of moles x avogadros number.
1.5 x (6.02x10^23) = 9.03x10^23 molecules

A carbon-12 atom has 6 protons, 6 neutrons, and 6 electrons. How many protons does a carbon-14 atom have?

Answers

Answer:

A carbon-14 atom has 6 protons, 8 neutrons and 6 electrons. The number 12 or 14 in the name of carbon-12 and carbon-14 refers to their atomic mass.

Explanation:

Those atoms that have the same "atomic number" but differente "atomic  mass" (or atomic weight) are called isotopes.

Atomic number indicates the amount of electrons that an atom has, which matchs with the number of protons it has.

Atomic mass indicates the sum of protons and neutrons that an atom has.

Example with carbon-12:

carbon atomic number = 6 (find this information in a periodic table)

electrons= 6

protons= 6

carbon atomic mass = 12 (find this information in a periodic table)

neutrons= atomic mass - number of protons= 12-6 = 6 neutrons

Using the same analysis for carbon-14:

carbon atomic number = 6

electrons= 6

protons= 6

carbon atomic mass = 14

neutrons= atomic mass - number of protons = 14-6 = 8 neutrons

In this way, carbon-14 is an isotope of carbon-12 because carbon-14 has the same atomic number than carbono-12 but different atomic mass.
An isotope of carbon always has 6 protons - that is the part of the atom which shows it is carbon. If it had a different number of protons, it would be a different element altogether
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