Question

Can somebody help me check my answers please its only 14 questions?? Really appreciate the help if you help .

Which of the following is the Arrhenius definition of an acid?

a substance that donates a hydrogen ion to another substance during a reaction

a substance that increases the concentration of hydronium ions when dissolved in water

a substance that accepts a lone-pair of electrons during a reaction

a substance that has a pH less than 7

I marked B

Answer 1

Which of the following best describes acid anhydrides?

When hydrogen chloride is dissolved, the polar bond between hydrogen and chlorine allows the hydrogen to separate from the chlorine.

Aqueous solutions that contain acids are able to conduct an electric current because of the presence of electrolytes, or ions.

When a strong base like sodium hydroxide is dissolved, large amounts of heat are released because the process is exothermic.

When carbon dioxide (CO2) is dissolved in water, carbonic acid (H2CO3) is formed. The carbonic acid acts as an acid by giving off hydrogen ions to water.

I marked D

Answer 2

In acid rain, nitrogen oxides and sulfur oxides from emissions cause a change in the normal pH level. Which of the following is not true of acid rain?

Some of the damaging oxides are produced by natural sources such as volcanoes and forest fires.

Most of the damaging oxides are produced from burning fossil fuels.

In the atmosphere, the oxides form nitric acid and sulfuric acid.

The pH levels of acid rain are very acidic; in the range of 2.0 – 3.0.

I marked B

Answer 3

What substance is acting as the Brønsted-Lowry acid in the following reaction?

H2SO4 + H20 H30+ + HSO4-

H2SO4

H2O

H30+

HSO4-

I marked A

Answer 4

Which of the following is an acid-base neutralization reaction?

Sn + 2HF SnF2 + H2

C2H4 +3O2 2CO2 + H2O

MgCl2 + Ca(OH)2 Mg(OH)2 + CaCl2

HNO3 + KOH KNO3 + H2O

I marked D

Answer 5

What is the salt produced when sodium hydroxide (NaOH) reacts with sulfuric acid (H2SO4)?

Na2S

Na2H2

Na2SO3

Na2SO4

I marked D

Answer 6

What is the concentration of an NaOH solution that requires 15.0 ml of a 0.750 M H2SO4 solution to neutralize 17.5 ml of NaOH?

0.321 M

0.643 M

0.875 M

1.29 M

I marked D

Answer 7

What is the concentration of a Ca(OH)2 solution if 15.0 ml of 0.500 M H3PO4 solution is required to completely neutralize 22.5 ml of the Ca(OH)2 solution?

1.00 M

0.500 M

0.333 M

0.167 M

I marked B

Answer 8

When liquid water is put into a closed flask and heated, eventually the following equilibrium may be established.

H2O (l) H2O (g)

When this system reaches equilibrium, which of the following is true?

All of the liquid molecules have become gas molecules.

The rates of the forward and reverse reactions are equal.

All the molecules in the flask are moving at the same speed.

The total volume of the liquid is equal to the total volume of the gas.

I needed help with this??

Answer 9

The graph below shows the progress of a reversible reaction over time. Which of the following is represented by the green line?



The reaction has gone to completion.

The system has reached a state of equilibrium.

The concentration of the products equals that of the reactants.

The system is no longer closed and the reaction will no longer occur.

Answer 10

I needed help with the chart one above ??

Answer 11

How would a decrease in volume affect the following reaction?
N2 (g) + O2 (g) 2NO (g)

The equilibrium would shift to the right.

The equilibrium would shift to the left.

There would be no change to equilibrium.

The affect on equilibrium cannot be determined.

I marked A

Answer 12

Which situation would cause the following equilibrium reaction to shift to the right?

N2O4 (g) 2 NO2 (g)

increase the pressure

remove N2O4

remove NO2

decrease the volume

I marked D

Answer 13

LAST POST QUESTION..
Which situation would cause the following equilibrium reaction to increase the formation of the reactants?

2SO2 (g) + O2 (g) 2SO3 (g) + Energy

increase the temperature

decrease the temperature

increase the pressure

decrease the volume

I marked B

Answer 14

If my memory does not fail it all look fine to me.

For the question:
"When liquid water is put into a closed flask and heated, eventually the following equilibrium may be established."
What is special for a solution in equilibrium?

For the question:
If you can answer the question above I will say you have this answer too.

Answer 15

I don't get that question at all and the chart question also ?

Answer 16

Okay.
Then lets take the options step by step:
If a chemical reaction is in equilibrium, would you then say that all the molecules are either product or reactants?

Answer 17

Product?

Answer 18

Yes the reaction they look at is: