Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

8th Grade Science > Chapter 5 Test > Flashcards

Chapter 5 Test Flashcards

You may prefer our related Brainscape-certified flashcards:
Biology 101 flashcards
1
Q 
Which one is NOT a chemical reaction?
A. Wood burning
B. Snow melting
C. Fruit rotting
D. Metal rusting
A

B. Snow melting

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What are the signs a chemical reaction has occurred?

A
  • change in temperature
  • change in color
  • formation of a gas (bubbles)
  • a precipitate (solid) forms
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What type of reaction is this the general equation for?

A+B → AB

A

Synthesis Reaction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What type of reaction is this the general equation for?

AB+ CD → AD + CB

A

Double Replacement Reaction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What type of reaction is this the general equation for?

AB → A + B

A

Decomposition Reaction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What type of reaction is this the general equation for?

fuel + oxygen → carbon dioxide + water

A

Combustion Reaction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What type of reaction is this the general equation for?

A+BC → B+ AC

A

Single Replacement Reaction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

TRUE or FALSE?

Chemical reactions are necessary for life.

A

TRUE

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

TRUE or FALSE?

The same molecules must be present on both sides of a chemical equation.

A

FALSE

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

TRUE or FALSE?

A great concentration of reactants slows down a chemical reaction.

A

FALSE

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

TRUE or FALSE?

In a combustion reaction, a fuel combines quickly with oxygen.

A

TRUE

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

TRUE or FALSE?

A change in state is a common sign of a chemical reaction.

A

FALSE

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What do all chemical reactions need to get started?

A

Energy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

This type of reaction absorbs heat.

A

Endothermic

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

This type of reaction produces heat.

A

Exothermic

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

TRUE or FALSE?

The mass of the reactants must always equal the mass of the products in a chemical reaction.

A

TRUE

17
Q

TRUE or FALSE?

The formation of water from hydrogen and oxygen is a reversible reaction.

A

TRUE

18
Q

Why do chemical changes occur?

A

Because of chemical reactions.

19
Q

What are the “ingredients” of a chemical reaction called?

A

Reactants

20
Q

What are the substances that are made in a chemical reaction called?

A

Products

21
Q

What does it mean when we say a chemical equation is balanced?

A

That it has the same number of atoms of each element on both sides of the reaction.

22
Q

What is a coefficient? (with respect to a chemical equation)

A

The number that is placed in front of an element or a molecule.

23
Q

How do we use coefficients when balancing chemical equations?

A

We can change them to get the number of atoms the same on both sides.

24
Q

What is a subscript? (with regard to a chemical reaction)

A

The small number written at the bottom of an atom to indicate how many of that atom are in a molecule.

25
Q

What are the products of a combustion reaction?

A

Water and Carbon Dioxide

26
Q

What is the energy needed to start a chemical reaction called?

A

Activation Energy

27
Q

What is a substance called that speeds up a chemical reaction?

A

a catalyst

28
Q

Chemical reaction in which two or more reactants combine to form a single product.

A

Synthesis reaction

29
Q

A chemical reaction that occurs when two reactants exchange cations or anions to yield two new products.

A

Double Replacement Reaction

30
Q

A reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat.

A

Combustion reaction

31
Q

A chemical reaction in which one reactant breaks down into two or more products.

A

Decomposition reaction.

32
Q

A reaction in which one element is substituted for another element in a compound.

A

Single replacement reaction.

33
Q

Is this reaction balanced?

N2 +3H2 →2NH3

(the card editor won’t let me type subscripts…)

A

Yes.

34
Q

Is this reaction balanced?

CH4 +O2 →CO2 +2H2O

(the card editor won’t let me type subscripts…)

A

No.

8th Grade Science (12 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions