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Chemistry Midterm (2023)

Total questions: 91

Worksheet time: 1hrs 7mins

Name
Class
Date
1.
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
2.
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
3.
An experiment is performed on plants to see how different liquids affect plant growth. Each plant in the experiment is given a different liquid; water, apple juice, or milk. Each plant has the same amount of soil, sunlight, and listens to the same music. In this investigation, the independent variable is ...
a)
The type of plant
b)
The amount of sunlight
c)
The type of music
d)
The type of liquid
4.
A student wants to test the effects of type of exercise on heart rate.  What is the dependent variable?
a)
heart rate
b)
type of exercise
c)
amount of exercise
d)
time of day exercise occurs
5.

What are observations that are measured or counted called?

a)

qualitative data

b)

quantitative data

6.

What are observations made using our five senses called? hint: used to make descriptions

a)

qualitative data

b)

quantitative data

7.

Evidence is ___________________

a)

a statement or conclusion that answers a question

b)

information that tends to prove or disprove a claim

c)

a justification that connects the claim to the evidence

d)

Not vital when using an argument

8.

A claim is ______________________________.

a)

examples, data, facts, and information.

b)

a fact.

c)

a debatable statement that can be supported with evidence.

d)

an answer to a question.

9.

Reasoning is __________________.

a)

A statement of conclusion that answers the original question/problem.

b)

Scientific data that supports the claim

c)

Explains why and how the evidence actually connects and supports the claim.

d)

Empirical Evidence

10.

Which piece of evidence could be used to BEST support this claim:


High school students should be required to wear uniforms.

a)

When adding everything up, a school uniform could end up costing more than $200.

b)

A student reported, "Allowing us to wear our own clothes gives us a chance to show our unique style and independence."

c)

At one school that recently required students to wear uniforms, attendence rates went up, and behavior incidents went down.

d)

School uniforms can be ordered online .

11.

Students should be required to do community service.

a)

Evidence statement

b)

Claim statement

c)

Reasoning statement

12.

"Plants need sunlight, water and carbon dioxide to make food."

Is this a claim, evidence or reasoning?

a)

Claim

b)

Evidence

c)

Reasoning

13.

The amount of matter an object contains.

a)

Volume

b)

Mass

c)

Pressure

d)

Length

14.

Physical or chemical?

a)

Physical

b)

Chemical

15.

Physical or chemical?

a)

Physical

b)

Chemical

16.

Physical or chemical?

a)

Physical

b)

Chemical

17.

Physical or chemical?

a)

Chemical

b)

Physical

18.

Physical or Chemical?

a)

Physical

b)

Chemical

19.

Physical or chemical?

a)

Physical

b)

Chemical

20.

NH3 is a:

a)

Mixture

b)

Element

c)

Compound

d)

Particle

21.

Water and sugar dissolved is an example of: hint: looks the same throughout

a)

Compound

b)

Homogeneous mixture

c)

Substance

d)

Heterogeneous mixture

22.

A chocolate chip cookie is an example of:

a)

Substance

b)

Compound

c)

Homogeneous mixture

d)

Heterogeneous mixture

23.

What mixture is an heterogeneous mixture?

a)

Soluble coffee in water

b)

Sand and water

c)

Perfume

d)

Apple juice

24.

The mixtures where the components can be distinguished at simple sight

a)

Homogeneous

b)

Heterogeneous

c)

Homogeneous and heterogeneous

d)

None

25.

The mixtures where components CAN NOT be distinguished at simple sight:

a)

Homogeneous

b)

Heterogeneous

c)

Homogeneous and heterogeneous

d)

None

26.

The atmosphere is:

a)

Mixture

b)

Substance

c)

Element

d)

Compound

27.
This picture represents: 
a)
Element
b)
Compound
c)
Mixture of Elements
d)
Mixture of Compounds
28.
What type of mixture is this?
a)
homogenous mixture
b)
chemical
c)
heterogeneous mixture 
d)
solid mix
29.

Blue color: Chemical or Physical Property

a)
Chemical Property
b)
Physical Property
30.
Density: Chemical or Physical Property
a)
Chemical Property
b)
Physical Property
31.
Flammability (burns): Chemical or Physical Property
a)
Chemical Property
b)
Physical Property
32.

Reacts with acid: Chemical or Physical Property

a)
Chemical Property
b)
Physical Property
33.
Brittleness: Chemical or Physical Property
a)
Chemical Property
b)
Physical Property
34.

Sour taste: Chemical or Physical Property

a)
Chemical Property
b)
Physical Property
35.

Melting point: Chemical or Physical Property

a)
Chemical Property
b)
Physical Property
36.

Reacts with water: Chemical or Physical Property

a)
Chemical Property
b)
Physical Property
37.
Hardness: Chemical or Physical Property
a)
Chemical Property
b)
Physical Property
38.
Luster: Chemical or Physical Property
a)
Chemical Property
b)
Physical Property
39.

Which one of these is a chemical property?

a)

Melting point

b)

Boiling point

c)

Color

d)

Toxicity

40.
Physical properties are
a)

Properties that can be observed without changing the identity of the substance

b)

Properties that describe how a substance changes into a completely different substance

41.
Which of the following chemical formulas represents a compound? 
a)
C3
b)
O2
c)
CH3CHO
d)
H2
42.
Which statement best describes an element?
a)
made from mixture 
b)
thousands in the world
c)

pure, made of only one type of atom

d)
can be separated 
43.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture
44.
What is the term for combining 2 or more atoms together?
a)
atoms
b)
elements
c)
molecules
d)
compounds
45.
What is the term for combining 2 or more DIFFERENT atoms together?
a)
atoms
b)
elements
c)
molecules
d)
compounds
46.
Are these molecules also compounds?
a)
YES
b)
NO
47.

The positively charged particle in an atom.

a)

Proton

b)

Neutron

c)

Electron

d)

Nucleus

48.

The total number of protons and neutrons in the nucleus of an atom

a)

Atomic Number

b)

Mass Number

c)

Atomic Theory

d)

Electron Cloud

49.

The center of an atom where its neutrons and protons are is called the _____________.

a)

nucleus

b)

electron cloud

c)

center

50.

The mass number of an atom is the mass of ______ + _____

a)

protons + neutrons

b)

protons + electrons

c)

neutrons + nucleus

d)

protons + nucleus

51.

The mass number is always larger than the atomic number (exept for Hydrogen).

a)

TRUE

b)

FALSE

52.
How are elements on the periodic table arranged by?
a)
in alphabetic order
b)
simular physical & chemical properties
c)
their symbols
d)
Just simular physical properties
53.
Each column in the periodic table is called a _________ .
a)
period
b)
group
c)
cluster
d)
unit
54.
Periods on the periodic table are __________.
a)
Horizontal Rows
b)
Vertical Columns
55.
Who was the first person to study atomic theory?
a)
Dalton
b)
Democritus
c)
Chadwick
d)
Miller
56.
the smallest particle of an element that retains the chemical properties of that element
a)
ion
b)
isotope
c)
atom
d)
element
57.

What is a negatively charged particle?

a)

neutron

b)

electron

c)

proton

d)

atom

58.

What is a particle with no charge?

a)

neutron

b)

electron

c)

proton

d)

atom

59.

If oxygen-16 has 8 protons, then how many neutrons does it have?

a)

9

b)

16

c)

8

d)

7

60.

What is a positive ion called?

a)

anion

b)

cation

c)

isotope

d)

covalent

61.

What is a negative ion called?

a)

anion

b)

cation

c)

covalent

d)

isotope

62.

If an atom gains electrons, the charge will be positive.

a)

true

b)

false

63.

If an atom loses electrons, it becomes a negative ion.

a)

True

b)

False

64.
What is the charge of an atom that has lost one electron?
a)
-1
b)
-2
c)
+1
d)
+2
65.
Which is an electron?
a)
A
b)
B
c)
C
66.
How many electrons does Si contain? (click to see image)
a)
14
b)
28
c)
2
d)
4
67.
How many neutrons does the isotope of lithium have?
a)
8
b)
3
c)
5
68.
How many protons does this isotope of titanium have?
a)
48
b)
22
c)
26
69.
How is carbon-12 different from carbon-14?
a)
They have a different number of protons
b)
they have a different number of electrons
c)
they have a different number of neutrons
70.

Chlorine ( Cl) has _________ valence electrons.

a)

3

b)

5

c)

7

d)

8

71.

Ga has _______ valence electrons.

a)

8

b)

4

c)

3

d)

1

72.

How many electrons can fit on the 1st energy level (orbital) for any Bohr Model?

a)

2

b)

6

c)

8

d)

10

73.
How many valence electrons?
a)
2
b)
3
c)
5
d)
10
74.

The outermost electrons of an atom are __________.

a)

outermost electron

b)

octet electrons

c)

valence electrons

d)

Lewis electrons

75.

This is a correct dot diagram for carbon (C) -- Carbon has an atomic number of 6

a)

true

b)

false

76.

Why do all bonds form?

a)

to fill the outermost energy level

b)

so an atom can be unstable

c)

so the number of protons and electrons can equal.

d)

so they can gain neutrons.

77.

An atom with 1 valence electron 'needs' a full shell, so it can either gain 7 electrons or lose 1. Which is more likely to occur?

a)

nothing

b)

gain 7

c)

lose 1

78.

How do covalent bonds form?

a)

by sharing electrons between atoms

b)

by donating or receiving electrons

79.

What two types of atoms make a covalent bond?

a)

2 nonmetals

b)

2 metals

c)

1 metal and 1 nonmetal`

80.

Ionic bonds are between

a)

metals and nonmetals

b)

2 metals

c)

2 nonmetals

81.

How are ionic bonds formed?

a)

transfer of electrons

b)

sharing of electrons

82.

The ________ is a measure of the average kinetic energy of a substance.

a)

heat

b)

thermal energy

c)

temperature

d)

conductor

83.

In an exothermic reaction, energy is ________the surroundings making the temperature of the surroundings ________. To your hands it feels _______.

a)

absorbed from, decrease, cold

b)

released to, increase, warm

c)

released to, decrease, cold

d)

absorbed from, increase, warm

84.

Is this reaction endothermic or exothermic?

a)

endothermic

b)

exothermic

85.

What does Q stand for?

a)

Heat or Energy

b)

Mass

c)

specific heat or specific heat capacity

d)

Temperature

86.

What unit is Heat/Energy usually in?

a)

oC

b)

Joules

c)

J/goC

87.

What does m stand for and what is it's unit?

a)

temperature change, oC

b)

Heat, Joules

c)

mass, grams

d)

specific heat, J/goC

88.

We will use lowercase "c" instead of CS, what does c stand for?

a)

Temperature in Celcius

b)

specific heat capacity

c)

heat released or absorbed

89.

What is the change in temperature?

a)

90 degrees Celsius

b)

-90 degrees Celsius

c)

9612  J

d)

120 g

90.

What is your final answer? q= m x c x Δ  T

a)

0.89 J/g°\degree°C

b)

1.12 J/g°\degree°​C

91.
According to the Law of Conservation of Energy, energy cannot be _________ or ____________. 
a)
destroyed, destroyed
b)
created, saved
c)
created, destroyed
d)
lost, found

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