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8th Grade Unit 5 Review

Froggy Jumps

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8th Grade Unit 5 Review

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8th Grade Unit 5 Review
 

Froggy Jumps

8th Grade Unit 5 ReviewOnline version

8th Grade Unit 5 Review

by Jeff
1

A ________________ DOES NOT produce new substances or products.

2

During a _____________________, one or more substances or reactants CHANGE into new substances or products.

3

A chemical reaction is a process in which atoms of one or more substances ________________ to form one or more new substances.

4

Which of the following would be an example of a physical change?

5

Which of the following would be an example of a chemical change?

6

In which of the following circumstances, can you infer that a chemical reaction has occurred?

7

In which of the following circumstances, can you infer that a chemical reaction has occurred?

8

In which of the following circumstances, can you infer that a chemical reaction has occurred?

9

A _____________________ is a description of a chemical reaction using element symbols and chemical formulas.

10

Some elements exist in nature as _____________________ -two atoms bonded together. These will be found with a subscript of 2.

11

The starting substances in a chemical reaction are referred to as

12

The substances produced by the chemical reaction are referred to as

13

Which of the following represents the appropriate structure for a chemical equation?

14

The ______________________________ states that the total mass of the reactants before a chemical reaction is the same as the total mass of the products after the chemical reaction.

15

I will be expected to know how to balance a chemical equation for this Summative Assessment.

16

When hydrogen peroxide interacts with sunlight it undergoes a chemical change, which yields Water and Oxygen. What kind of chemical reaction does this represent?

17

In a ________________________ reaction, one compound breaks down and forms two or more substances.

18

A ________________ reaction is a type of chemical reaction in which two or more substances combine to from one compound.

19

Magnesium reacts with Oxygen in the air and forms Magnesium Oxide. The previous sentence describes what kind of reaction?

20

In a _________________ reaction, one element replaces another element in a compound.

21

Replacement reactions NEVER involve metal elements.

22

Combustion reactions always include Carbon Dioxide and Water as REACTANTS.

23

Combustion reactions always include Carbon Dioxide and Water as PRODUCTS.

24

Combustion reactions always include Oxygen as a REACTANT(s).

25

A combustion reaction usually releases energy as _________________________ energy.

26

I will be expected to identify what type of chemical reaction is occurring by looking at a chemical equation on this summative assessment.

27

Chemical bonds contain a form of energy called ________________ energy.

28

When a chemical bond BREAKS, __________________.

29

When a chemical bond FORMS, __________________.

30

In physics and chemistry, the ______________________ states that the total energy of an isolated system remains constant; it is said to be conserved over time.

31

Chemical Reactions that ABSORB thermal energy are called ____________________.

32

Chemical Reactions that RELEASE thermal energy are called ____________________.

33

________________________ is the minimum amount of energy needed to start a chemical reaction.

34

Which of the following could increase the rate of reaction in a chemical reaction?

35

A(n) _________________ is a substance that increases a reaction rate by lowering the activation energy.

36

A(n) ___________________ is a substance that slows, or even stops, a chemical reaction.

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