Question

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

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.

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.

Answer 3

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 4

Amyla - looks like you have posted your entire homework here. It is unlikely that some one will come to help. You could for example, ask for an explanation of acid anhydrides and then try to solve the problem yourself.