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Midterm Review Ch 1-3

Total questions: 45

Worksheet time: 35mins

Name
Class
Date
1.

in an experiment, a variable that does not change

a)

constant

b)

control

c)

independent variable

d)

dependent variable

2.

mass per unit volume of a material

a)

density

b)

mass

c)

volume

d)

standard

3.

amount of matter in an object

a)

mass

b)

matter

c)

volume

d)

standard

4.

anything that takes up space and has mass

a)

matter

b)

model

c)

variable

d)

control

5.

can be used to represent an idea, object, or event that is too big, too small, too complex, or too dangerous to observe or test directly

a)

model

b)

control

c)

varible

d)

society

6.

statement about what happens in nature that seems to be true all the time; does not explain why or how something happens

a)

scientific law

b)

theory

7.

pattern of investigation procedures that can include stating a problem, forming a hypothesis, researching and gathering information, testing a hypothesis, analyzing data, and drawing conclusions

a)

scientific methods

b)

experiment

c)

variable

d)

control

8.

the improved, universally accepted version of the metric system that is based on multiples of ten and includes the meter (m), liter (L), and kilogram (kg)

a)

SI

b)

constant

c)

control

d)

theory

9.

explanation of things or events based on knowledge gained from many observations and investigations

a)

theory

b)

scientific law

10.

amount of space occupied by an object

a)

volume

b)

mass

c)

matter

d)

control

11.
____________properties can only be observed when the substance in a sample of matter are changing into different substances
a)
pure substance 
b)
physical 
c)
mixture 
d)
chemical 
12.
Flammability is a material's ability to burn in the presence of _____
a)
carbon dioxide 
b)
hydrogen 
c)
nitrogen 
d)
oxygen 
13.
What method can be used to separate parts of a liquid mixture when the entire mixture can pass through a filter?
a)
screening 
b)
filtration 
c)
distillation 
d)
straining 
14.
Filtration can be used to separate mixtures based on ____
a)
the size of their particles 
b)
their boiling points 
c)
their color 
d)
their melting points 
15.
Physical or chemical change?
A solid is crushed into a powder?
a)
physical change 
b)
chemical change 
16.
Which of the following is a mixture?
a)
chocolate milk 
b)
carbon dioxide 
c)
water 
d)
hydrogen 
17.
Which of the following is not a pure substance?
a)
carbon dioxide 
b)
cereal 
c)
helium 
d)
water
18.
Which of the following is not a clue that a chemical change has occurred? 
a)
change in the shape 
b)
change in color 
c)
production of a gas 
d)
formation of a precipitate 
19.
If an unknown substance cannot be broken down into simpler substances, it is _____
a)
a compound 
b)
an element 
c)
a mixture 
d)
none of the options 
20.
Chemical or physical change?
Burning coal to heat a house 
a)
Physical change 
b)
chemical change 
21.
Matter that has exactly the same composition is classified as a _____
a)
homogeneous mixture 
b)
pure substance 
c)
heterogeneous mixture 
d)
solution 
22.
Which of the following is a clue of a chemical change 
a)
a gas forms when vinegar and baking soda are mixed 
b)
iron changes color when heated 
c)
gas bubbles form in boiling water 
d)
balls of wax form when melted wax is poured into ice water 
23.
In a ______ mixture the parts of the mixture are noticeably different from one another 
a)
heterogeneous 
b)
homogeneous 
c)
solution 
d)
compound 
24.
If a substance is a _____mixture the particles are evenly distributed throughout the entire mixture.
a)
homogeneous 
b)
suspension
c)
 colloid 
d)
heterogeneous 
25.
What is the formula for calculating density?
a)
Mass ∗ Volume
b)
Volume ∗ Mass
c)
Mass ÷ Volume
d)
Volume ÷ Mass
26.
The ability of a substance to dissolve is called...
a)
malleability
b)
ductility
c)
solubility
27.
Which two particles make up the nucleus of an atom?
a)
Protons and Electrons
b)
Protons and Neutrons
c)
Molecules and Compounds
d)
Neutrons and Electrons
28.
The particles with no charge in an atom are the _______.
a)
electrons
b)
neutrons
c)
protons
d)
protons and neutrons
29.
The negatively charged particles of an atom are the ______.
a)
electrons
b)
protons
c)
neutrons
d)
protons & neutrons
30.
An atom with atomic number 6 would have how many protons?
a)
6
b)
12
c)
3
d)
cannot be determined 
31.
How many electrons are in the element, Oxygen, with the atomic number of 8?
a)
7
b)
10
c)
8
d)
9
32.

Rutherford realized that the atomic nucleus was positively charged because

a)

it attracted alpha particles.

b)

it deflected alpha particles.

c)

it had no effect on alpha particles.

d)

it produced alpha particles.

33.

Rutherford's experiment that he used to discover protons and the nucleus.

a)

gold foil experiment

b)

cathode ray experiment

c)

neither of these is correct

34.
What is the mass number?
a)
the number of protons
b)
the sum of the number of protons and the number of neutrons in the nucleus of an atom 
c)
the number of electrons
d)
the number of neutrons
35.
Which scientist developed the atomic theory?
a)
JJ Thomson
b)
Ernest Rutherford
c)
John Dalton
d)
James Chadwick
36.

JJ Thomson came up with which model for the atom?

a)

planetary model

b)

electron cloud model

c)

plum pudding model

d)

nuclear model

37.

After Rutherford discovered the nucleus, which model is believed to be true?

a)

protons, neutrons, and electrons are evenly distributed

b)

the nucleus is made of protons, neutrons, and electrons

c)

the nucleus is made of protons and electrons

d)

the model is mostly empty space with a central nucleus

38.

These are used to identify the element:

a)

protons

b)

neutrons

c)

electrons

d)

ions

39.

John Dalton wrote postulates to make the idea of the atom useful. Which postulate below was proven wrong?

a)

All elements are made up of tiny indivisible particles called atoms.

b)

The atoms of one element are different from the atoms of another element.

c)

Atoms of different elements chemically combine to form chemical compounds.

d)

During chemical reactions, atoms are rearranged.

40.

What experiment did JJ Thomson use?

a)

gold foil experiment

b)

cathode ray tube experiment

41.
How many significant figures: 216 m
a)
1
b)
2
c)
3
d)
0
42.
How many significant figures: 0.012 km
a)
1
b)
2
c)
3
d)
4
43.

How many significant figures: 450 m

a)

3

b)

2

c)

1

d)

0

44.
You know 1000 mg = 1 g.  Convert 2.5 grams into milligrams.
a)
25 mg
b)
25,000 mg
c)
250 mg
d)
2500 mg
45.
The length of a desk is 3.5 feet. How many centimeters is the length? 
(there are 2.54 cm in an inch)
a)
60
b)
120.23
c)
106.68
d)
117.12

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