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Investigations in Chem Midterm 2026

Total questions: 143

Worksheet time: 2hrs 43mins

Name
Class
Date
1.
What is an inference? 
a)
Just a random guess
b)
A prediction or logical conclusions about our observations
c)
The same as an observation
d)
deciding if an observation is qualitative or quantitative
2.

Choose 2 inferences about this picture.

(select all that apply)

a)

Today is the dog's birthday.

b)

There is a candle on the cake.

c)

The dog has a tag on the collar.

d)

The dog will eat the cake.

3.

Observation or Inference: I think the weather is cold.

a)

Observation

b)

Inference

4.

Observation or Inference: I notice the tree by the pond has no leaves on it.

a)

Observation

b)

Inference

5.
Observations like the color or texture of an object are ________________ observations.
a)
quantitative
b)
qualitative
c)
operational
d)
scientific
6.
Observations like measurements are ____________ observations
a)
quantitiative
b)
qualitative
c)
operational
d)
scientific
7.

"There are 5 wolves in the pack this year."

Is this a quantitative or qualitative observation?

a)

Qualitative Observation

b)

Quantitative Observation

8.
The summary at the end of an experiment that explains the results is... 
a)
conclusion
b)
procedures
c)
materials
d)
responding variable
9.
A testable prediction about a scientific investigation is a(n)
a)
Question
b)
Observation
c)
Hypothesis
d)
Experiment
10.
An experiment is being done to determine how light affects the growth of small zinnia plants. One plant is placed in full sunlight, the second in a shaded area, the third in an unlit closet. What is the independent variable in the experiment?
a)
the amount of light
b)
the type of plants
c)
the type of soil
d)
the length of the experiment
11.
True or False - Experiments should have many independent variables.
a)
TRUE
b)
FALSE
12.
This variable in an experiment is the one being deliberately changed by the scientist. 
a)
dependent variable
b)
independent variable
c)
data
d)
control group
13.
In a controlled experiment, how many variables can be worked with at a time? 
a)
one
b)
none
c)
two or more
d)
how ever many makes sense.
14.
The part of the experiment that remains the same for the control and experimental group.
a)
constants
b)
control
c)
independent
d)
dependent
15.
Mr. S. sets up an experiment to see how the mass of a ball affects the distance it rolls off a ramp.  Identify the independent variable.
a)
distance traveled by the ball
b)
height of the ramp
c)
mass of the ball
d)
weight of the ball
16.

The more light bulb you add to a room, the brighter it will be. What is the dependent variable?

a)

Amount of lightbulbs

b)

How bright the room is

17.

The variable that is measured or observed.

a)

Independent Variable

b)

Dependent Variable

18.

Aaliyah wants to know how drinking milk affects how tall a a person grows. Which is the dependent variable?

a)

The height of a person

b)

Drinking milk

19.
This part of the experiment serves as a basis of comparison; the one variable being tested has been omitted. 
a)
experimental group
b)
control group
c)
data
d)
variables
20.

The two groups in a controlled experiment are -

Pick 2

a)

Control Group

b)

Experimental Group (Test)

c)

Independent Variable

d)

Dependent Variable

e)

Constant(s)

21.

Hypothesis: If plants are watered more than normal, then growth height will increase. What is the control group?

a)

the amount of water

b)

a plant receiving the normal amount of water

22.

Gatorade wants to sell more sports drinks so they decide to add more sugar. They bring two groups in to assess the new drink. For Group A they give them gatoradewith an added teaspoon of sugar. For Group B they give them plain gatorade without adding sugar. Which Group is the CONTROL GROUP?

a)

Group A

b)

Group B

c)

The Gatorade

d)

The Company

23.

Chemistry is:

a)

The study of matter and the changes it undergoes

b)

Anything with mass and volume

c)

The amount of matter in an object

24.

Matter is:

a)

The study of matter and the changes it undergoes

b)

Anything with mass and volume

c)

The amount of matter in an object

25.

Mass is:

a)

Anything with mass and volume

b)

The amount of matter in an object

c)

The amount of space an object takes up

26.

Volume is:

a)

Anything with mass and volume

b)

The amount of matter in an object

c)

The amount of space an object takes up

27.

Density is:

a)

The amount of mass within a certain volume

b)

The amount of matter in an object

c)

The amount of space an object takes up

28.
Consider the picture of the jar holding oil, syrup, and water. It would be easy to pour off the oil to separate from both the syrup and water because the liquids have different
a)
densities
b)
masses
c)
temperatures
29.
Put the liquids in order from most dense to least dense?
a)
4, 3, 2, 1
b)
1, 2, 3, 4
c)
3, 4, 2, 1, 
d)
4, 3, 1, 2
30.
What is the formula for density?
a)
density = mass x volume
b)
density = mass / volume
c)
density = mass + volume
31.

Frank has an eraser. It has a mass of 4 g, and a volume of 2 mL. What is its density?

d = m/v

a)

8 g/mL

b)

2 g/mL

c)

0.5 g/mL

32.
Why do some substances float on water?
a)
they are cooler than water
b)
they are more dense than water
c)
they are less dense than water
33.

A crayon has a mass of 10g and volume of 5 mL. What is the density?

d = m/v

a)
15 g/mL
b)
1 g/mL
c)
2 g/mL
34.

If an object has a density of .6 g/mL and you put it into water, will it sink or float?

**Note: the density of water is 1 g/mL

a)
sink
b)
float
35.

If an object has a density of 3.6 g/mL and you put it into water, will it sink or float?

**Note: the density of water is 1 g/mL

a)
sink
b)
float
36.

What units are used for mass?

a)
centimeter 
b)
millimeter 
c)
grams 
37.

Which unit(s) of measurement is used for volume?

a)
grams
b)

g/mL

c)

mL

38.
How much water has been displaced in the image shown?
a)
40 mL
b)
65 mL
c)
25 mL
39.
How much water has been displaced in the image shown?
a)
100 mL
b)
20 mL
c)
60 mL
40.

Anything that has mass and takes up space (has volume).

a)

Matter

b)

Solid

c)

Liquid

d)

Gas

41.

State of matter that has a definite shape and volume.

a)

Matter

b)

Solid

c)

Liquid

d)

Gas

42.

State of matter that does NOT have a definite shape or volume.

a)

Matter

b)

Solid

c)

Liquid

d)

Gas

43.

State of matter that does NOT have a definite shape, but has a definite volume.

a)

Matter

b)

Solid

c)

Liquid

d)

Gas

44.

How do you know matter is EVERYWHERE?

a)

Solids have mass and take up space.

b)

Liquids have mass and take up space.

c)

Gases have mass and take up space.

d)

All of the above.

45.

How can you get an invisible solid out of a liquid?

a)

Pour it through a strainer.

b)

Heat it so the liquid evaporates away.

c)

Pour it through a coffee filter.

46.

What state of matter?

a)

Solid

b)

Liquid

c)

Gas

d)

Plasma

47.

Which type of matter maintains its shape?

a)

solid

b)

liquid

c)

gas

48.

What kind of mixture is shown in the picture?

a)

Homogeneous

b)

Heterogeneous

49.

What kind of mixture is shown in the picture?

a)

Homogeneous

b)

Heterogeneous

50.
Salad is an example of a
a)
homogeneous mixture
b)
heterogeneous mixture
51.

Salt (NaCl) is an example of a(n)...

a)

element

b)

compound

c)

heterogeneous mixture

d)

homogeneous mixture

52.

Water (H2O) is an example of a(n)...

a)

element

b)

compound

c)

heterogenous mixture

d)

homogeneous mixture

53.

Soil is an example of a(n)...

a)

element

b)

compound

c)

heterogeneous mixture

d)

homogeneous mixture

54.
What is a homogeneous mixture?
a)
a mixture that is the same throughout.
b)
a mixture that is made up of one type of compound
c)
a mixture that cannot be separated through physical changes
55.
A mixture that is NOT evenly distributed is called ....
a)
Compounded
b)
Homogenous
c)
Heterogenous
d)
Salty
56.
What type of mixture is this?
a)
homogenous mixture
b)
chemical
c)
heterogeneous mixture 
d)
solid mix
57.
Italian Salad Dressing is a . . .
a)
heterogeneous mixture
b)
homogeneous mixture
c)
Pure Substance
d)
Compound
58.
Chicken soup is an example of what kind of substance?
a)
homogenous mixture
b)
solution
c)
heterogeneous mixture
d)
compound
59.

Carbon (C) is an example of a(n)...

a)
Element
b)
Compound
c)
Homogeneous Mixture
d)
Heterogeneous Mixture
60.

Aluminum (Al) is an example of a(n)...

a)
Element
b)
Compound
c)
Homogeneous Mixture
d)
Heterogeneous Mixture
61.

Cobalt (Co) is an example of a(n)...

a)
Element
b)
Compound
c)
Homogeneous Mixture
d)
Heterogeneous Mixture
62.

Salt (NaCl) is a(n)...

a)

pure substance

b)

mixture

c)

solution

d)

element

63.

Salt dissolved in distilled water is a(n)...

a)

heterogeneous mixture

b)

homogeneous mixture

c)

element

64.

A _____________ contains a variety of elements and compounds that are not chemically combined with each other.

a)

pure substance

b)

element

c)

mixture

65.

A ______________ mixture is one that does not have a uniform composition.

a)

heterogeneous

b)

homogenous

c)

pure substance

66.

A _________________ mixture is one where the substances are evenly spread throughout.

a)

heterogeneous

b)

homogeneous

c)

pure substance

67.

Which TWO are pure substances?

a)

Elements

b)

Compounds

c)

Homogeneous Mixtures

d)

Heterogeneous mixtures

68.

Match the following.

a)

Melting

1.

Solid --> Liquid

b)

Freezing

2.

Liquid --> Solid

c)

Condensation

3.

Gas --> Liquid

d)

Vaporization

4.

Liquid --> Gas

69.

What does the atomic number represent?

a)

The number of electrons in an atom

b)

The number of neutrons in an atom

c)

The number of protons in an atom

d)

The number of atoms in a molecule

70.

What does the mass number represent?

a)

The number of protons and electrons

b)

The number of protons and neutrons

c)

The number of electrons and neutrons

d)

The number of atoms in a molecule

71.

What charge does a neutron have?

a)

Positive (+)

b)

Negative (-)

c)

Neutral (0)

d)

Double positive

72.

Neutrons are located (a)   in an atom.

Choose from the below words
Outside the nucleus
In the nucleus
In the electron cloud
In the outer shell
73.

What charge does an electron have?

a)

Positive (+)

b)

Neutral (0)

c)

Negative (-)

d)

Double negative

74.

Electrons are located (a)   in an atom.

Choose from the below words
In the nucleus
Outside the nucleus
In the proton cloud
In the neutron cloud
75.

Which subatomic particle is found outside the nucleus?

a)

Proton

b)

Neutron

c)

Electron

d)

Atom

76.

Match the following elements with their atomic numbers.

a)

5

1.

Boron (B)

b)

11

2.

Sodium (Na)

c)

6

3.

Carbon (C)

d)

12

4.

Magnesium (Mg)

77.

What is the element symbol for Sodium?

a)

Na

b)

B

c)

Cu

d)

Y

78.

How many protons are in Sodium (Na)?

a)

22.99

b)

19

c)

11

d)

3

79.

For Fluorine, the atomic number is nine. The mass number is 19. How many neutrons in one atom of Fluorine?

a)

9

b)

7

c)

19

d)

10

80.

Which particles contribute to the mass number?

(Click 2 hotspots)

A
B
C
81.

If an atom has an atomic number of 8 and a mass number of 16, how many neutrons does it have?

a)

8

b)

16

c)

24

d)

32

82.

How many valence electrons does this atom have?

83.

Place the number of valence electrons that each element has after the name of the element.

Fluorine​ (F) ​ ​ ​ (a)  

Hydrogen (H)​ ​ (b)  

Nitrogen​ (N) ​ ​ (c)  

Boron​ (B) ​ (d)  

Choose from the below words
7
1
5
3
2
4
6
8
84.

Match the number of valence electrons with the correct element,

Selenium (Se)​ (a)  

Silicon (Si) (b)  

Krypton (Kr)​ (c)  

Strontium(Sr) ​ (d)  

Choose from the below words
6
4
8
2
1
3
5
7
85.

Which arrow points to the neutrons?

A
B
C
86.

Which arrow points to the electrons?

A
B
C
87.

Which arrow points to the protons?

A
B
C
88.

This is a correct dot diagram for nitrogen (N)

a)

true

b)

false

89.

This is a correct dot diagram for carbon (C)

a)

true

b)

false

90.

Which of these is correct?

a)
b)
91.
What's a valence electron?
a)
electrons in the second energy level
b)
electrons in the outermost energy level
c)
the atomic number
d)
electrons in the first level
92.

Which of these is correct?

a)
b)
c)
93.

Is this a metal, metalloid, or nonmetal?

a)

Metal

b)

Metalloid

c)

Nonmetal

94.

Is this a metal, metalloid, or nonmetal?

a)

Metal

b)

Metalloid

c)

Nonmetal

95.

Is this a metal, metalloid, or nonmetal?

a)

Metal

b)

Metalloid

c)

Nonmetal

96.

Is this a metal, metalloid, or nonmetal?

a)

Metal

b)

Metalloid

c)

Nonmetal

97.

Is this a metal, metalloid, or nonmetal?

a)

Metal

b)

Metalloid

c)

Nonmetal

98.

Is this a metal, metalloid, or nonmetal?

a)

Metal

b)

Metalloid

c)

Nonmetal

99.

Is this a metal, metalloid, or nonmetal?

a)

Metal

b)

Metalloid

c)

Nonmetal

100.

Is this a metal, metalloid, or nonmetal?

a)

Metal

b)

Metalloid

c)

Nonmetal

101.

Is this a metal, metalloid, or nonmetal?

a)

Metal

b)

Metalloid

c)

Nonmetal

102.

Is this a metal, metalloid, or nonmetal?

a)

Metal

b)

Metalloid

c)

Nonmetal

103.
Good conductor of heat
a)
Metal
b)
Nonmetal
104.
Which of the following is a property of a non-metal?
a)
Conducts electricity and heats well
b)
Can be hammered into thin sheets
c)
Is brittle and breaks easily
d)
Has a shiny, metallic luster
105.
Metalloids _____________
a)
have no properties of metals.
b)
have no properties of nonmetals.
c)
have some properties of both metals and nonmetals.
d)
none of the above
106.

When an object changes shape when struck by a hammer it is said to be...

a)

luster

b)

malleable

c)

brittle

d)

ductile

107.
How do metals differ from nonmetals?
a)
metals are shiny, nonmetals are dull
b)
metals are good insulators, nonmetals are good conductors
c)
metals are powdery
d)
nonmetals are shiny
108.
I have an object that is dull, brittle, and an insulator, what is it?
a)
metalloid
b)
non-metal
c)
metal
d)
matter
109.
The table shows the properties of four elements. Which element in the table is classified as a metal?
a)
Manganese
b)
Sulfur
c)
Silicon
d)
Neon
110.
Which of the following is an Alkali Metal? 
a)
Magnesium
b)
Chromium
c)
Sodium
d)
Fluorine 
111.
Which of the following is an Alkaline Earth Metal? 
a)
Calcium
b)
Lithium
c)
Phosphorus
d)
Copper 
112.
Which of the following is a transition metal? 
a)
Iron
b)
Oxygen
c)
Neon
d)
Barium
113.
Which of the following is a Halogen? 
a)
Bromine
b)
Rubidium
c)
Argon
d)
Beryllium
114.
Which of the following is a Noble Gas? 
a)
Krypton
b)
Chlorine
c)
Radium
d)
Gallium
115.
Which of the following is the most reactive group of metals? 
a)
Alkali
b)
Alkaline Earth
c)
Halogen
d)
Transition Metals
116.
Which of the following is the most reactive group of non-metals? 
a)
Alkali
b)
Alkali Earth
c)
Halogen
d)
Noble Gas
117.

The elements in this family are soft, silvery, and very reactive with water.

a)

Alkaline Earth Metals

b)

Alkali Metals

c)

Transition Metals

d)

Lanthanides

118.
Gold (Au)
a)
Transition Metal
b)
Alkali Metal
c)
Alkaline Earth Metal
d)
Heavy Metal
119.

Which element is not in the Alkali metal family?

a)

Lithium

b)

Hydrogen

c)

Francium

d)

Cesium

120.
a)
Alkali
b)
Alkaline Earth
c)
Halogens
d)
Noble Gases
121.
a)
Alkali
b)
Alkaline Earth
c)
Halogen
d)
Noble Gases
122.
a)
Alkali
b)
Alkaline
c)
Halogen
d)
Noble Gases
123.
a)
Alkali
b)
Alkaline
c)
Halogen
d)
Noble Gases
124.
a)

Transition Metals

b)

Inner Transition Metals

c)

Metals

d)

Metalloids

125.

All elements in the same GROUP have the same number of ___.

a)

protons

b)

neutrons

c)

atomic mass units

d)

valence electrons

126.
The majority of elements on the periodic table are
a)
man made.
b)
nonmetals.
c)
metals.
d)
gases.
127.
Neon is part of the _ family.
a)
alkali metals
b)
alkaline earth metals
c)
halogens
d)
noble gases
128.

How do isotopes of the same element differ?

a)

Different number of protons

b)

Different number of electrons

c)

Different number of neutrons

d)

Different atomic numbers

129.

If Carbon-14 has 6 protons, how many neutrons does it have?

a)

6

b)

7

c)

8

d)

14

130.

Which of the following is true about isotopes?

a)

They have different atomic numbers.

b)

They have the same number of neutrons.

c)

They have the same number of protons.

d)

They are different elements.

131.

How can you find the number of neutrons in an isotope?

a)

Subtract the atomic number from the mass number.

b)

Add the atomic number to the mass number.

c)

Multiply the atomic number by 2.

d)

Divide the mass number by the atomic number.

132.

What is the mass number of an isotope with 20 protons and 22 neutrons?

a)

20

b)

22

c)

40

d)

42

133.

If an isotope has an atomic number of 15 and a mass number of 31, how many neutrons does it have?

a)

15

b)

16

c)

31

d)

46

134.

Which of the following isotopes has the most neutrons?

a)

Oxygen-16

b)

Oxygen-17

c)

Oxygen-18

d)

They all have the same number of neutrons.

135.

An isotope of nitrogen has 7 protons and 8 neutrons. What is its mass number?

a)

7

b)

8

c)

15

d)

22

136.

An isotope is an atom of the ​ (a)   element but with a different number of ​ (b)   . This difference causes the ​ (c)   of the atom to change.

Choose from the below words
same
neutrons
mass
different
protons
electrons
charge
atomic number
137.

Label the picture

a)

mass number

b)

atomic number

c)7
d)15
e)charge
1
2
3
1)
2)
3)
138.

Label the isotope symbol for Calcium-41.

a)

19

b)

41

c)

22

d)

20

e)

40

f)

21

g)

39

1
2
3
1)
2)
3)
139.

Label the mass number:

A
B
C
140.

Label the number of protons:

A
B
C
141.

Label the number that is protons and neutrons added together:

A
B
C
142.
Question Image

Match the following

a)

number of protons

1.

18

b)

number of neutrons

2.

22

c)

mass number

3.

40

143.
Identify the parts of the periodic table element shown.
a)

Atomic Number

b)

Element Symbol

c)

Element Name

d)Atomic weight(aka mass #)
1
2
3
4
1)
2)
3)
4)

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