2nd Long Test PhySci

Riane is cutting some apples for her snacks; she noticed that while cutting the apple, its shape and size are changing. What type of change is described by the changes in the size and shape of an apple?

• A. Chemical Change
• B. Crucial Change
• C. Partial Change
• D. Physical Change

What type of reaction occurs when substances react chemically to produce new products or substances?

• A. Chemical Reaction
• B. Crucial Reaction
• C. Partial Reaction
• D. Physical Reaction

The spoilage of food left over produces molds. In the reaction, there is a reactant and there is a product. Which of the substances is the product?

• A. Food
• B. Ingredients
• C. Mold
• D. None

According to the collision theory, substances or particles of the reactants must physically collide with enough energy. How can you describe the statement above?

• A. The statement is true.
• B. The statement is false.
• C. The statement is not valid.
• D. The statement lacks evidence.

Riane left some apples on the table and noticed that after a few days, the apple turned soft and began to produce an unnecessary smell. She concluded that the apple is rotten. What type of change is described by the changes in the texture or smell of an apple?

• A. Chemical Change
• B. Crucial Change
• C. Partial Change
• D. Physical Change

What type of reaction is characterized by rusting of iron?

• A. Chemical Reaction
• B. Crucial Reaction
• C. Partial Reaction
• D. Physical Reaction

During summer, foods spoil easily. It is caused by the fast movement of molecules making the reaction rate of chemicals in the food faster. What factor that affects the reaction rate is described in the situation above?

• A. Catalyst involved
• B. Concentration
• C. Surface area
• D. Temperature

When it is raining, aside from the presence of oxygen molecules in the air, more oxygen molecules from the rain are added that collide with iron molecules resulting in a steel rod rusting at a faster rate. What factor that affects the reaction rate is described in the situation above?

• A. Catalyst involved
• B. Concentration
• C. Surface area
• D. Temperature

A spherical metal was pounded and turned into thin sheets to increase its reaction rate when exposed to heat. What factor that affects the reaction rate is described in the situation above?

• A. Catalyst involved
• B. Concentration
• C. Surface area
• D. Temperature

Molecules are bonded with either intramolecular or intermolecular bonds. What basic form of energy is used by these bonds to keep the molecules intact?

• A. Chemical Energy
• B. Electrical Energy
• C. Mechanical Energy
• D. Radiant Energy