Chemical Reactions

Front

In making a pizza, which process involves a chemical change?

Back

Baking the dough to form the crust

Front

Which of the following is an example of a physical change but not a chemical change?

• A log gives off heat and light as it burns.
• A tree stores energy from the Sun in its fruit.
• A penny lost in the grass slowly changes color.
• A water pipe freezes and cracks on a cold night.

Back

A water pipe freezes and cracks on a cold night.

Front

Characteristic of all chemical changes

Back

A new material is formed.

Front

Examine the following chemical reaction:

H20 + CO2 → C6H12O6 + O2

What are the reactants?

Back

H20 + CO2

Front

Examine the following chemical reaction:

H2O2 → H2O + O2

What are the products?

Back

H2O + O2

Front

In which of the following examples has a chemical reaction occurred?

• After putting liquid batter into a hot pan, the batter solidifies and begins to turn brown.
• After turning on a blender filled with fruits, the fruit is chopped up and mixed together.
• After taking a tray filled with ice cubes out of the freezer, the cubes begin to melt.
• After adding a spoonful of sugar to a mug of hot coffee, the sugar dissolves completely.

Back

After putting liquid batter into a hot pan, the batter solidifies and begins to turn brown.

Front

According to the Law of Conservation of Mass,

Back

matter is not created or destroyed in a chemical reaction

Front

The law of conservation of mass can be demonstrated by a chemical reaction. Which model of a chemical reaction best represents this law?

Back

Front

Corrosive

Back

Able to cause damage

Front

During a chemical reaction, atoms ____________ to form new substances.

Back

Rearrange