Chapter 6

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1

What is anything that has mass and takes up space?

Matter

2

The study of matter and how it changes is called?

Chemistry

3

What is a physical property?

a characteristic of a substance that can be observed without changing the substance into another substance

4

What is an example of a physical property?

Color, hardness, texture, change of state

5

A change in matter that produces new substances is called a?

chemical reaction

6

What is an example of a chemical property?

flammability, oxidation

7

The substances that undergo change in a chemical reaction are called what?

reactants

8

The new substances formed in a chemical reaction are called what?

products

9

What is evidence that a chemical reaction is has occurred?

precipitate, color change, bubbles, texture, temperature

10

In an endothermic reaction, energy is?

absorbed

11

In an exothermic reactions, energy is?

released

12

What is a chemical formula?

an easy way to show a chemical reaction using symbols instead of words

13

What does the conservation of matter state?

In chemical reaction, matter is neither created nor destroyed.

14

The number in front of a chemical formula that tells how many molecules or atoms of each reactant take part in a reaction is called a?

coefficient

15

In what kind of system is matter not allowed to enter or leave?

Closed system

16

What kind of chemical reaction occurs when compounds break down into simpler products?

decomposition

17

What kind of chemical reaction occurs when one element replaces another in a compound, or when two elements in different compounds trade places?

replacement

18

What kind of chemical reaction involves two or more elements combining to make a more complex substance?

synthesis

19

What is activation energy?

the minimum amount of energy needed to start a chemical reaction

20

In an exothermic reaction, the products

have less energy than the reactants

21

In an endothermic reactant, the products

have more energy than the reactants

22

What factors affect the rates of chemical reactions?

temperature, surface area, concentration, catalysts, inhibitors

23

What is an inhibitor?

a material used to decrease the rate of reaction

24

A material that increases the rate of the reaction is called a?

catalyst

25

What prevents reactants from coming together?

inhibitor

26

What are the three things necessary to start and maintain a fire?

fuel, oxygen, heat

27

What is combustion?

a rapid reaction between oxygen and fuel

28

What provides activation energy to start a fire?

heat