Quiz about Review: Chemical Reactions

Question 1

Define physical change.

Accepted Answer

change that alters form or appearance of a substance without changing it to a different substance

Answer

change in matter that produces one or more new substances ; atoms and molecules rearrange to form new combinations

Question 2

Define chemical change.

Accepted Answer

change in matter that produces one or more new substances ; atoms and molecules rearrange to form new combinations

Answer

change that alters form or appearance of a substance without changing it to a different substance

Question 3

What is Law of Conservation of Matter/Mass?

Accepted Answer

matter cannot be created or destroyed

Answer

matter can be created or destroyed

Answer

mass is matter

Question 4

What is an endothermic reaction?

Accepted Answer

cooler than its surroundings ; absorb energy

Answer

hotter than its surroundings ; releases energy

Question 5

What is an exothermic reaction?

Accepted Answer

hotter than its surroundings ; releases energy

Answer

cooler than its surroundings ; absorb energy

Question 6

The LEFT side of the reaction are

Accepted Answer

reactants

Answer

products

Question 7

The RIGHT side of the reaction are

Accepted Answer

products

Answer

reactants

Question 8

Another term for chemical change is

Accepted Answer

chemical reaction

Answer

physical change

Answer

product

Answer

reactant

Question 9

What is an open system?

Accepted Answer

system where matter can enter & escape

Answer

system where no matter is allowed to enter or leave

Question 10

What is an closed system?

Accepted Answer

system where no matter is allowed to enter or leave

Answer

system where matter can enter & escape

Question 11

Which of the following is NOT a type of a chemical reaction?

Accepted Answer

polymer

Answer

synthesis

Answer

replacement

Answer

decomposition

Question 12

A science class wants to determine if iron will react with water. They leave a piece of iron outside for a week. During the third day, it rained heavily. At the end of the week, the students brought in the iron piece. They noticed there was orange material on the iron. The following table compares the properties of iron, water, and the remaining solid material.

Has a physical or chemical change occurred?

Accepted Answer

A chemical change has occurred because the orange solid material had different properties (melting point, boiling point, and density) than the two reactants. This indicates that a new substance was created.

Answer

A chemical change has occurred because there was remaining solid material. If the change was only physical, the material would have all turned to liquid.

Answer

A physical change has occurred because there was remaining solid material. If the change was chemical, the iron would have completely turned liquid.

Answer

A physical change has occurred because the remaining solid material had different physical properties (melting point, boiling point, and density) than the 2 reactants. Only a change in chemical property, such as flammability, would indicate a chemical change.

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