Learning the Basic Chemical Reactions

This passage describes a chemical reaction. Read the passage. Then, follow the instructions below.

Gasoline provides the energy that powers many car engines. In an engine, gasoline and oxygen are mixed together and burned, creating carbon dioxide gas and water vapor. This process releases energy that the engine uses to turn the wheels, making the car move.

Complete the sentence.

In this chemical reaction, water is a ##product##.

This passage describes a chemical reaction. Read the passage. Then, follow the instructions below.

Ozone is a gas found high up in Earth's atmosphere. In places with severe air pollution, ozone can also be found in the air closer to the ground. This ground-level ozone forms when oxygen in the air combines with carbon monoxide and other chemicals in polluted air. Ground-level ozone can harm humans by damaging their lungs.

Complete the sentence.

In this chemical reaction, Oxygen is a ##reactant##.

Hydrogen peroxide, a household disinfectant breaks down over time into oxygen gas and water.

Consider the following reaction:

Some amount of hydrogen peroxide (H2O2), reacts to produce 1 molecule of oxygen (O2) and 2 molecules of water (H2O).

Use the number of atoms in the reaction to answer the question below.

During this reaction, how many molecules of hydrogen peroxide (H2O2) react?

Phosgene is a substance that is often used to make the padding found in the car and airplane seats. It is produced when carbon monoxide and chlorine gas react.

Consider the following reaction:

3 molecules of carbon monoxide (CO) react with 3 molecules of chlorine (Cl2) to produce some amount of phosgene (COCl2).

During this reaction, how many molecules of phosgene (COCl2) are produced?

Acetaldehyde is a substance commonly used in chemical factories. It is often produced by combining ethylene gas and oxygen gas.

Consider the following reaction:

4 molecules of ethylene (C2H4) react with 2 molecules of oxygen (O2) to produce some amount of acetaldehyde (C2H4O).

During this reaction, how many molecules of acetaldehyde (C2H4O) are produced?

When a chemical reaction absorbs or releases thermal energy, the reaction causes a change in temperature. Read the passage about a chemical reaction that absorbs or releases thermal energy. Then, follow the instructions below.

Some chemical substances explode under pressure. One such substance, nitrogen triiodide (NI3), explodes at even the lightest touch! When this happens, the nitrogen triiodide breaks down to form nitrogen (N2) and iodine (I2). During this reaction, chemical energy is converted to an enormous amount of thermal energy, which is transferred into the surroundings.

Complete the statement.

During this chemical reaction, the air around the reaction becomes ##warmer##.

Complete the sentence.

Your breath becoming visible on a cold day is a ____________.

Complete the sentence.

A copper statue turning green is a ___________ .