CHEMISTRY HIGH SCHOOL

The equation shows the reaction between zinc metal and hydrochloric acid.Zn(s) + 2HCl(aq) mc014-1.jpg ZnCl2(aq) + H2(g)


What is the theoretical yield of hydrogen gas if 5.00 mol of zinc are added to an excess of hydrochloric acid?
5.05 g
10.1 g
182 g
682 g

Answers

Answer 1
Answer: The balanced chemical reaction is written as:

Zn(s) + 2HCl(aq) = ZnCl2(aq) + H2(g)

We are given the amount of the reactant zinc to be used in the reaction This amount would be the starting point for the calculation. It is as follows:

5.00 mol Zn ( 1 mol H2 / 1 mol Zn ) (2.02 g H2 / 1 mol H2 ) = 10.1 g H2

Therefore, the correct answer is the second option.
Answer 2
Answer:

Answer:

B. 10.1g

Explanation:

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Which molecules contain good leaving groups?

Answers

Answer:

proton and neutron

Explanation:

proton is positive while neutron is neutral so they can live togher

What can happen when a fission chain reaction gets out of control? This can cause a loss of heat. This can cause an explosion. This can cause extreme cooling of radioactive waste. This can cause a rapid decrease in pressure. This can cause neutrons to combine to form new atoms.

Answers

When a fission chain reaction gets out of control this can cause an explosion. Typically, fission chain reactions are regulated by control rods in a nuclear reactor. However, in cases of accidents, these chain reactions release high energies very quickly. This leads to explosions and other life-threatening incidents.

In other words, the answer should be

b. This can cause an explosion.

posting this for future users to see!

As the density of a substance increases, the volume of a given mass of that substance__.a. Increases
b. is not affected
c. decreases
d. fluctuates

Answers

Answer : The correct option is, (C) decreases

Explanation :

As we know that the density is measured as the mass of substance divided by the volume of substance. The S.I unit of density is, kilogram per cubic meter or Kg/m^3

Formula for density :

\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}

That means the density is directly proportional to the mass of the substance and inversely proportional to the volume of the substance.

As the volume of substance decreases, the density of a substance will be increases and volume of substance increases, the density of a substance will be decreases.

Hence, the correct option is, (C) decreases
As the density of a substance increases the volume of a givenmass of the substance decreases

David kept 100 grams of radioactive sodium in a container. He observed the amount of sodium left in the container after regular intervals of time and recorded them in the table shown below.Time (hours) Amount of sodium in container (in grams)
0 100
15 50
30 25
45 12.5

Based on the observations, which of these is most likely David's inference?
A.The half life period of radioactive sodium is 15 hours.
B.The half life period of radioactive sodium is 50 hours.
C.The amount of sodium left in the container after 60 hours will be 10.5 grams.
D.The amount of sodium left in the container after 60 hours will be 1.5 grams.

Answers

First we have to understand what a half life is. A half life is a measure of time when the amount of a certain object is 50% of the original amount. Hence the answer for this is letter A. The initial amount is 100. fifty percent of 100 is 50 and that happens after 15 hours. Hence, 15 hours is the half life period. 

Answer: A. The half life period of radioactive sodium is 15 hours.

Explanation:

Half life is the time taken by a reactant to reduce to its original concentration. It is designated by the symbol t_(1)/(2).

Given:

At 0 hours the amount of sodium in container is 100 grams

After 15 hours , the amount of sodium in container is 50 grams which is half of the original amount of 100 grams.

It will take 15 hours for half of a 100 g sample to decay to half of the amount i.e. 50 grams.

The mass spectrum of a sample of a pure element is shown above. Based on the data, the peak at 26amu represents an isotope of which of the following elements? A) Al with 13 neutrons
B) Mg with 14 neutrons
C) Fe with 26 neutrons
D) Ti with 26 neutrons

Answers

The correct answer is option B: Mg with 14 neutrons

The mass spectrum shows the charge to mass ratio of atoms. I can be used to sort the isotopes of an element.

Isotopy is a phenomenon in which atoms of the same element have the same atomic number but different mass numbers.

The mass spectrum of atoms separates atoms on the basis of charge to mass ratio of the isotopes.

The isotopes of magnesium are;  24Mg atom which has 12 neutrons 25Mg which has 13 neutrons, and  26Mg which has 14 neutrons.

Hence, the peak at 26amu represents 26Mg which has 14 neutrons.

brainly.com/question/24160758

Answer:

The answer is B

The first shell can hold a maximum of two electrons. How does this explain the valence of hydrogen?

Answers

The hydrogen atom has only one electron which is present in the first shell.

We know that first shell can hold a maximum of two electrons so due to incomplete valance shell hydrogen atom is reactive and make covalent bond with other reactive atoms. This bonding will complete its valance shell and finish its reactive nature. In the second shell and other shells can hold 8 electrons so we can conclude that hydrogen has one valance electron.

Learn more: brainly.com/question/2811159
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