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3 weeks Review (2nd Six Weeks)

Total questions: 29

Worksheet time: 1hrs 27mins

Name
Class
Date
1.
Which of the following is a sign that a chemical reaction has occurred?
a)
change in shape
b)
melting
c)
formation of a gas
d)
dissolving
2.
Is burning wood a chemical or physical change?
a)
chemical
b)
physical
3.
A change in the size, shape, or state of matter.
a)
chemical change
b)
physical change
c)
chemical reaction
d)
electron change
4.
A clear liquid from a flask is poured into another clear liquid in a beaker. Which of the following results of this procedure would indicate a new substance was formed?
a)
The level of the substance in the beaker is higher after the other liquid is added.
b)
A yellow solid forms and then settles to the bottom of the beaker.
c)
Small white crystals are left behind in the flask that held the first liquid.
5.
Evidence of a chemical reactions is anything that shows - 
a)
a new substance has formed
b)
a solid dissolved in a liquid
c)
interaction between 2 gases
d)
a change in the state of matter
6.

What is the name for the starting substances in a chemical reaction?

a)

reactants

b)

products

7.

What is the name for the final substance(s) during a chemical reaction?

a)

reactants

b)

products

8.

Which changes are considered chemical changes? (Pick all that apply.)

a)

Rusting

b)

Tarnishing of silver

c)

Digestion of food

d)

Melting ice

e)

Rotting banana

9.

A glow stick is cracked. What sign of a chemical change is this?

a)

The production of light

b)

Formation of a precipitate

c)

Production of gas

10.

Which part of digestion is mainly a chemical change?

a)

Teeth break food into small pieces.

b)

Throat muscles push food toward the stomach.

c)

Stomach acids dissolve food into nutrients.

d)

Intestinal cells transport nutrients into the blood.

11.

Taking a HUGE bite out of your favorite food and chewing it is______________.

a)

chemical change

b)

physical change

c)

mechanical digestion

d)

chemical digestion

12.

When you swallow your food and the food is then getting digestive in stomach acid and different enzymes, that is considered___________.

a)

physical change

b)

chemical change

c)

mechanical digestion

d)

chemical digestion

13.

The Law of Conservation of Mass states Matter is NEITHER created nor destroyed.

a)

True

b)

False

14.

How many oxygen atoms are in this chemical formula?

a)

6 oxygen atoms

b)

2 oxygen atoms

c)

3 oxygen atoms

d)

4 oxygen atoms

15.
A chemical reaction is balanced when
a)
both sides have the same elements
b)
Both sides have the same  number of atoms
c)
Same subscripts
d)
Same coefficients
16.
If a reaction starts with a total 75g of reactants it should produce 
a)
a total of 40g of products
b)
a total of 75g of products
c)
a total of 180 g of products
d)
None of the above
17.
How many elements does PbNO3 have?
a)
2
b)
3
c)
4
d)
5
18.
Which equation best represents the law of conservation of mass? 
a)
A
b)
B
c)
C
d)
D
19.

Is this equation balanced or unbalanced?

CH4 + 2O2--> CO2+ 2H2O

a)

balanced

b)

unbalanced

20.
Is this balanced?
2HgO → 2Hg + O2
a)
Yes
b)
No
21.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
22.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
23.
Frank has a paper clip. It has a mass of 9g and a volume of 3cm3. What is its density?
a)
3 g/cm3
b)
1/3 g/cm3
c)
27 g/cm3
d)
39 g/cm3
24.
An irregularly shaped piece of gold was lowered into a graduated cylinder holding a volume of water equal to 17 ml. The height of the water rose to 20 ml. If the mass of the gold was 27 g, what was its density?
a)
9 g/mL
b)
10.5 g/mL
c)
6.5 g/mL
d)
8 g/mL
25.

What’s the density of a liquid with a mass of 100g and a volume of 25mL?

a)

0.25 ml/g

b)

0.25 g/ml

c)

4 g/ml

d)

0.2 g/ml

26.

Find the density of a substance with a mass of 45 grams and a volume of 9 milliliters.

a)

5 kg/L

b)

5 g/ml

c)

45g

d)

36 g/ml

27.

A hammer with a mass of 458g is placed into a graduated cylinder. The student then records the water displacement to use it to find the density of the hammer. What is the density of the hammer?

a)

134

b)

114.5

c)

1832

d)

4

28.

What is the density of the star?

a)

5g

b)

5mL

c)

5 g/mL

d)

25g/mL

29.

A crayon has a mass of 528g and volume of 5 cm3. What is the density?

a)

30 g/cm3

b)

105.6 g/cm3

c)

5 g/cm3

d)

114.5 g/cm3

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