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Chemistry Sem1 Exam 2025

Total questions: 82

Worksheet time: 2hrs 43mins

Name
Class
Date
1.
15.6 L = ___________ mL
a)
15,600
b)
156,000
c)
1,560,000
d)
15,600,000
2.
The length of a desk is 3.5 feet. How many centimeters is the length? 
(there are 2.54 cm in an inch)
a)

16.54 cm

b)

120.23 cm

c)

106.68 cm

d)

8.71 cm

3.
How would you write 564,000,000 in scientific notation?
a)
5.64 x 10-7
b)
5.64 x 106
c)
5.64 x 108
d)
56.4 x 107
4.
What is 9.3 x 10-3 in standard form? 
a)
.093
b)
.0093
c)
.00093
d)
.000093
5.
How many significant figures: 0.012 km
a)
1
b)
2
c)
3
d)
4
6.

How many significant figures: 450 m

a)

3

b)

2

c)

1

d)

0

7.
How many significant figures: 4.20 cm
a)
1
b)
2
c)
3
d)
4
8.

Which Student is the most Precise?

a)

Alex

b)

Shandra

c)

Luis

9.

What is the length of the red line?

a)

68 cm

b)

6.85 cm

c)

6.9 cm

d)

7.00 cm

10.

Convert 1.23 Mg to ________ g

a)

1230000 g

b)

0.000000123 g

c)

1230 g

d)

0.000123 g

11.
It is a measure of how close measurements come to each other when they are made in the same way
a)
Accuracy
b)
Precision
c)
Error
d)
Extrapolation
12.
This bullseye demonstrates...
a)
High Accuracy & High Precision
b)
High Accuracy & Low Precision
c)
Low Accuracy & High Precision
d)
Low Accuracy & Low Precision
13.
The students measured length during a science experiement, they got 12 cm. But the actual measurement was 14.25 cm. What was the percent error?
a)
15.79%
b)
18.75%
c)
2.25%
d)
18%
14.
Volume?
a)
63.5 mL
b)
63 mL
c)
63.55 mL
d)
6 mL
15.
What type of mixture is this?
a)
heterogeneous 
b)
homogeneous
16.
Which one of these is a chemical property?
a)
melting point
b)
boiling point
c)
color
d)
flammability
17.
Which is an example of a physical property?
a)
ability to react with acid
b)
 state of matter
c)
flammability
d)
ability to react with oxygen
18.

A(n) ______________ is formed when two or more elements chemically combine.

a)

Compound

b)

Element

c)

Mixture

19.
Which of these is a pure substance?
a)
bread
b)
table salt
c)
garden soil
d)
sea water
20.
A pellet of sodium is sliced in two
a)
Chemical change
b)
Physical Change
21.
Hydrochloric acid reacts with potassium hydroxide to produce a salt, water,and heat.
a)
Chemical Change
b)
Physical Change
22.

The melting point of the sample is

a)

-60 ºC

b)

20 ºC

c)

60 ºC

d)

100 ºC

23.
The scattering of light by colloids is called ____. 
a)
homogeneous
b)
suspension
c)
air pollution
d)
The Tyndall effect
24.
Salt dissolving in water is an example of what?
a)
A physical change
b)
A chemical change
c)
A physical property
d)
A chemical property
25.

What type of material is pictured?

a)

Element

b)

Compound

c)

Heterogeneous mixture

d)

Homogeneous mixture

26.

Classify Kool-Aid as one of these 4 types of matter.

a)

Element

b)

Compound

c)

Homogeneous mixture

d)

Heterogeneous mixture

27.

Lauren wants to separate salt from water. What separation technique should she use?

a)

Evaporation

b)

Filtration

c)

Chromatography

28.

Which mixture can be separated using a filter?

a)

sand and iron filings

b)

saltwater

c)

sand and water

d)

none of the above

29.

How would you classify a chocolate chip granola bar?

a)

Element

b)

Compound

c)

Homogeneous Mixture

d)

Heterogeneous Mixture

30.

How would you classify coffee?

a)

Element

b)

Compound

c)

Homogeneous Mixture

d)

Heterogeneous Mixture

31.
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
32.

What does the atomic number of an element represent?

a)

The number of protons in the nucleus

b)

The number of neutrons in the nucleus

c)

The total number of protons and neutrons in the nucleus

d)

The total number of protons and electrons in an atom

33.
Which type of nuclear radiation is being emitted here?
a)
Alpha
b)
beta
c)
gamma 
d)
none
34.
Has the symbol
a)
Alpha
b)
Beta
c)
Gamma
35.
How many protons are in this atom?
a)
3
b)
4
c)
6
d)
10
36.
How did Rutherford discover the proton?
a)
Cathode tube ray experiment
b)
Gold Foil Experiment
c)
Planetary Model
d)
Plum Pudding Model
37.
What scientist first developed 4 rules for atomic theory, and helped kick start modern chemistry?
a)
J.J. Thomson
b)
Ernest Rutherford
c)
John Dalton
d)
Democritus
38.
The first person to propose a theory about an atom was
a)
Democritus
b)
Rutherford
c)
Dalton
d)
Aristotle
39.
What scientist is best known for his "Plum Pudding" model of the atom?
a)
J.J. Tomson
b)
Ernest Rutherford
c)
John Dalton
d)
Democritus
40.

How many electrons can the p sublevel hold?

a)

2

b)

3

c)

6

d)

8

41.

What is the maximum number of electrons that an orbital can have?

a)

2

b)

6

c)

8

d)

10

42.
For an electron to change from ground state to an excited stated it must...
a)
Absorb energy
b)
Release energy
43.

Why are line emission spectra used to identify stallar gases?

a)

They are easy to analyze

b)

They are all unique like a "fingerprint"

c)
They are all similar
d)
They all contain colored light
44.

I have 92 electrons and was used in the first atomic bomb called "Fat Man"... Who am I?

a)

Radium

b)

Zirconium

c)

Niobium

d)

Uranium

45.

I am an Alkaline Earth Metal in Period 6. Who am I?

a)

Cesium

b)

Calcium

c)

Barium

d)

Polonium

46.

Period 4 and form -1 ions

a)

Bromine

b)

Potassium

c)

Fluorine

d)

Selenium

47.

The most reactive nonmetal

a)

Fluorine

b)

Francium

c)

Chlorine

d)

Neon

48.

The only metalloid in period 3

a)

Silicon

b)

Aluminum

c)

Germanium

d)

Arsenic

49.

I have 3 valence electrons, found in detergents and only have one letter in my symbol.

a)

hydrogen

b)

fluorine

c)

boron

d)

phosphorous

50.

What are the vertical columns on the periodic table called?

a)

Groups

b)

Periods

c)

Elements

d)

Valence electrons

51.

Which elements are colored red?

a)

nonmetals

b)

metals

c)

metalloids

52.

What was a major contribution of Dmitri Mendeleev to the development of the periodic table?

a)

He discovered the electron.

b)

He arranged elements by increasing atomic mass and predicted the existence of undiscovered elements.

c)

He introduced the concept of atomic number.

d)

He discovered radioactivity.

53.

What is the formula for sodium nitride

a)

NaNO3

b)

NaN3

c)

NaN

d)

Na3N

54.

What do we call electrons in the highest energy level of an atom?

a)

orbital electrons

b)

cations

c)

anions

d)

valence electrons

55.

A charged group of atoms that behave as a single unit

a)

covalent compounds

b)

molecular compounds

c)

polyatomic ions

d)

a molecule

56.

LiBr is called

a)

lithium bromine

b)

lithium (I) bromine

c)

lithium bromide

d)

lithuim (I) bromide

57.

The name of FeCl₂ is

a)

iron chloride

b)

iron (II) chloride

c)

iron (I) chloride

d)

iron dichloride

58.

What is shown in the picture

a)

"Sea of Electrons" model

b)

ionic compound

c)

alloy

59.

The ability to be hammered into shapes

a)

malliability

b)

ductility

c)

softness

d)

hardened steel

60.

Why do metals conduct electricity?

a)

They are shiny

b)

The electrons are held tightly within the lattice

c)

The electrons are delocalized and able to move

d)

The electrons are shared between two metal ions

61.

What is the formula of gallium oxide?

a)

Ga2O3

b)

GaO

c)

GaO3

d)

Ga3O

62.
What is the formula for copper(I) sulfate?
a)
CuSO3
b)
CuSO4
c)
Cu2SO3
d)
Cu2SO4
63.

What ionic charge would an element with this electron dot diagram take on?

(a)  

64.

What two types of atoms make a covalent bond?

a)

2 nonmetals

b)

2 metals

c)

1 nonmetal & 1 metal

d)

2 noble gases

65.

Polar molecules are ....

a)

symmetrical

b)

asymmetrical

66.

Which image shows a polar covalent bond?

a)

b)

c)

d)

67.

What is the correct Lewis Dot Structure for NF₃?

a)

b)

c)

d)

68.
What is the name of N2O3
a)
Nitrogen trioxide
b)
Dinitrogen oxide
c)
Dinitrogen trioxide
d)
Nitrogen oxide
69.

Using the VSEPR model, predict the geometric shape of nitrogen trifluoride.

a)

trigonal pyrimidal

b)

trigonal planer

c)

bent

d)

tetrahedral

70.
What type of reaction is the equation C + O2 → CO2?
a)
Synthesis Reaction
b)
Decomposition Reaction
c)
Single Displacement Reaction
d)
Double Displacement Reaction
71.
Cu + 2Ag(NO3) → 2Ag + Cu(NO3)
a)
Synthesis Reaction
b)
Decomposition Reaction
c)
Single Displacement Reaction
d)
Double Displacement Reaction
72.

Identify the reaction type:

C2H6 + O2 --> CO2 + H2O

a)

Double displacement

b)

Synthesis

c)

Acid base

d)

Combustion

73.

What is the right part of a chemical equation called?

2H2 + O2 ---> 2H2O

a)

Reactants

b)

Yields

c)

Products

d)

Chemical Equation

74.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
75.

What coefficients are needed to balance the equation?

___Al + ___ O2 ---> 2Al2O3

a)

3,2

b)

3,4

c)

4 , 3

d)

4,2

76.

Which of the following is diatomic (magic 7). Select all that apply

a)

calcium

b)

hydrogen

c)

sulfur

d)

magnesium

e)

chlorine

77.
Question Image

Match the type of chemical reaction below.

a)

Synthesis reaction

1.

Na+ Cl2 →\rightarrow NaCl

b)

Decomposition reaction

2.

2KI −> 2K + I2​  

c)

Single displacement reaction

3.

Pb + FeSO4 ----> PbSO4 + Fe

d)

Double displacement reaction

4.

BaCl2​+2KI −> 2KCl + BaI2​

e)

Combustion reaction

5.

CH4​+O2​→CO2​+H2​O

78.
Balance this equation
_Al +_HCl --> _H2 +_AlCl3
a)
2, 6, 3, 2
b)
it is already balanced
c)
4, 12, 3, 4
d)
2, 1, 4, 5
79.
Based on the activity series, will this reaction occur?
Br2 (l) + KI (aq) →
a)
Yes
b)
No
80.

What will the balanced equation be if you react:

CaCl2 + NaOH

a)

CaCl2 + 2 NaOH --> Ca(OH)2 + 2 NaCl

b)

CaCl2 + 2 NaOH --> CaOH + 2 NaCl

c)

CaCl2 + 2 NaOH --> CaNa2 + 2 ClOH

d)

no reaction

81.

If I add potassium phosphate to barium nitrate in a double displacement reaction. Use solubility chart to identify the precipitate.

a)

Ba3(PO4)2

b)

KNO3

c)

Ba(NO3)2

d)

K3PO4

82.

You mix two solutions together and get a precipitate. Write an equation for mixing iron(II) iodide with potassium phosphate (don't worry about balancing it)

a)

FeI2 + K3PO4 → Fe3(PO4)2 + KI

b)

FeI + K2PO4 → K2I + FePO4

c)

FeI2 + K3PO4 → FeK3 + I2PO4

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