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Semester 1 exam review 2025

Total questions: 40

Worksheet time: 59mins

Name
Class
Date
1.
Which two compounds contain the same total number of atoms?
a)
H2O and NaCl
b)
C2H6 and NaHCO3
c)

CO and CO2

d)
CH4 and CaCO3
2.

How many different elements are in the formula CH3CH2Br?

a)

3

b)

5

c)

6

d)

2

3.

Which of the following chemical formulas contains exactly 4 hydrogen atoms?

a)

CH3COONa

b)

NH4OH

c)

CH3CH2Cl

d)

CH3CHO

4.

Cutting a tree limb into logs is (a)____________ and burning them in the fireplace is (b)____________.

a)

(a) A Physical Change

(b) Also a Physical Change

b)

(a) A Physical Change

(b) A Chemical Change

c)

(a) A Chemical Change

(b) Also a Chemical Change

d)

(a) A Chemical Change

(b) A Physical Change

5.

Which statement is true of the following chemical reaction?

a)

The mass of the reactants is less than the mass of the products.

b)

The mass of the reactants is greater than the mass of the products.

c)

The mass of the reactants is equal to the mass of the products.

6.
Which city can expect to see an increase in temperatures over the next 24 hours?
a)
Billings, Montana
b)
Atlanta, Georgia
c)
Minneapolis, Minnesota
d)
Miami, Florida
7.

According to this picture, warm air ____________, and cool air _______________

a)

rises, sinks

b)

sinks, rises

8.
The map shows the various ecoregions of Texas. Which ecoregion is most vulnerable to wind erosion from hurricanes originating in the Gulf of Mexico?
a)
Post Oak Savannah
b)
Blackland Prairies
c)
Edwards Plateau
d)
Gulf Prairies and Marshes
9.
Students react baking soda & vinegar.
Which of the following would provide the evidence that the number of atoms present before a chemical reaction is equal to the number of atoms present after the chemical reaction?
a)
The mass of the plastic bag, baking soda, and vinegar before the reaction was equal to the mass after the reaction.
b)
Bubbles were produced during the reaction, which meant that a gas was being produced.
c)
The plastic bag did not change in any way, indicating that it was not involved in the reaction.
d)
The mass of the baking soda was exactly equal to the mass of the vinegar used to create the chemical reaction.
10.

During a fun science experiment, Benjamin and Scarlett are mixing gases. In the reaction 2H2+O2→2H2O2H_2 + O_2 \rightarrow 2H_2O , can you help them figure out how many hydrogen atoms are present before and after the reaction?

a)

2 before, 2 after

b)

4 before, 4 after

c)

4 before, 2 after

d)

2 before, 4 after

11.

Mason and Luna are in the chemistry lab, and they stumble upon the reaction C3H8+5O2→3CO2+4H2OC_3H_8 + 5O_2 \rightarrow 3CO_2 + 4H_2O . Can you help them figure out how many carbon atoms are present before and after the reaction?

a)

3 before, 3 after

b)

6 before, 6 after

c)

3 before, 6 after

d)

6 before, 3 after

12.

The chemical formula for zinc phosphate is Zn3(PO4)2. Which correctly represents the atoms of each element present?

a)
b)
c)
d)
13.

A student wants to create a model of NaHCO3 (baking soda). How many LEGO blocks of each color are needed for the model?

a)

1-Yellow, 1-Red, 1-Black, and 3-White

b)

2-Yellow,1-White, Red, 1-Black, and 3-Red

c)

1-Yellow, 1-White, 1-Black, and 3-Red

d)

1-Yellow, 1-White, 3-Black, and 3-Red

14.

A teacher is demonstrating physical and chemical changes to their class. Which action should they use to demonstrate a chemical change?

a)

Cutting a piece of paper with scissors.

b)

Folding a piece of paper into an airplane.

c)

Ripping a piece of paper with their hands.

d)

Burning a piece of paper with a match.

15.
Which of the following is a reactant
a)
CH4
b)
H2O
c)
CO2
d)
2H2O
16.
Freezing Juice?
a)
Physical Change
b)
Chemical Change
17.
Identify the reactant(s) and product(s) of the reaction.
a)
All three are reactants and none are products.
b)
Hydrogen and water are the reactants, and oxygen is the product.
c)
Water and oxygen are the reactants, and hydrogen is the product.
d)
Hydrogen and oxygen are the reactants, and water is the product.
18.
Which has the LONGEST wavelength and, therefore, the lowest frequency/energy
a)
Gamma Rays
b)
Radio Waves
c)
Visible Light
d)
Infrared rays
19.
Which section of the spectrum is the ONLY one we can see?
a)
X-rays
b)
Visible Light
c)
Gamma Rays
d)
Ultraviolet Rays
20.
High frequency waves have _________ wavelengths.
a)
varying
b)
long
c)
the same
d)
short
21.
a)

Object 1, because it travels the greater distance per unit time

b)

Object 1, because it travels the longer amount of time

c)

Object 2, because it travels the shorter amount of time

d)

Object 2, because it travels the shorter distance per unit time

22.
a)

Student 1 traveled 40 m, and student 2 traveled 20 m.

b)

Student 1 traveled 50 m, and student 2 traveled 30 m.

c)

Student 1 traveled 60 m, and student 2 traveled 30 m.

d)

Student 1 traveled 70 m, and student 2 traveled 25 m.

23.
Use the Hertzsprung-Russell Diagram to answer the following question.  Betelgeuse is a _____
a)
Hot and Bright Star
b)
Cool and Bright Star
c)
Hot and Dim Star
d)
Cool and Dim Star
24.

Select any statement that is true about Star F on the diagram.

a)

Star F is a main sequence star.

b)

Star F is a blue star.

c)

Star F is a Spectral Type K star.

d)

Star F is a dim star.

e)

Star F has a low temperature.

25.

What the shape of the milky way? Choose the best shape

a)
b)
c)
d)
26.

Where are we, Earthlings, located in the Milky Way Galaxy?

a)

precisely at the center

b)

near the center

c)

halfway out from the center

d)

at the outer edge

27.

If you were giving directions to an alien from another galaxy, how would you tell him to locate Earth?

a)

Tell him to visit a little more than 1/2 out in one of the arms

b)

Tell him to visit the center bulge

c)

Tell him to visit the outermost part of one of the arms

d)

Tell him to visit the near the black hole at the center

28.

The number one thing hurricanes need is...

a)

warm water

b)

cold air from cold fronts

c)

cold water

d)

strong warm front

29.

How to oceans form hurricanes?

a)

warm air over the equator rises and faster than cold air from the poles

b)

warm waters provide the energy for hurricanes

c)

cold water provides the energy for hurricanes

d)

cold air at the poles is more dense and falls faster than warm air from the equator

30.

What city will experience decreasing temperatures in the next day?

a)

Denver

b)

El Paso

c)

Memphis

d)

Los Angeles

31.

What city is most likely going to see temperatures rise?

a)

San Jose

b)

El Paso

c)

Jacksonville

d)

Chicago

32.
Which best describes why winds at the beach change direction between day and night? **
a)
because the temperatures over land and over water change 
b)
because warm air over land sinks and stays in place over land
c)
because cool air rises and is replaced by warm air from the ocean 
d)
because cool air sinks and stays in place over land 
33.

Convection currents form when

a)

there are no temperature differences.

b)

there are temperature differences.

c)

each surface is exactly the same temperature.

d)

candy is given out for Halloween.

34.

The masses of four vehicles and the net forces acting on them as they enter a highway are recorded in the table below.


Which vehicle has the greatest acceleration as it enters the highway?

a)

Sedan

b)

Coupe

c)

SUV

d)

Truck

35.

For an investigation, a student measures the speed of a cart as it rolls down a ramp. The student then records data in the table. Which of these best explains the student's data?

a)

The speed of the cart decreases as the cart rolls down the ramp because of friction between the cart and the ramp.

b)

The speed of the cart increases as the cart rolls down the ramp because the force acting on the cart is greater than the force of gravity.

c)

The speed of the cart increases as the art rolls down the ramp because the forces acting on the cart are unbalanced.

d)

The speed of the cart decreases as the cart rolls down the ramp because the forces acting on the cart are balanced.

36.

A student lets a toy car roll four times down a ramp. Each time the student covers the surface of the ramp with a different material. The student measures and records the time it takes the car to roll down the ramp. Which of these would be the best conclusion based on the data in the table?

a)

Different surfaces affect how fast a toy car accelerates.

b)

Different toy cars travel at different speeds.

c)

Gravity has little effect on the speed of toy cars on different surfaces.

d)

Air resistance is the greatest factor in limiting the acceleration of different toy cars.

37.
Safety belts protect people in cars in the event of an accident because, according to Newton’s Laws of Motion, when an impact causes the car to suddenly change its motion, -
a)
the people in the car will continue to move in the same direction and at the same speed as before the impact.
b)
the speed of the car always increases, giving it greater force since the mass will remain the same.
c)
the speed of the people always increases, since now they have, not one, but two forces acting on them.
d)
the car now has a greater overall mass - its own mass plus the mass of the object by which it has been struck.
38.
According to Newton’s Law of Inertia, an object that is moving will change its motion only if what kinds of forces act on it?
a)
Constant forces
b)
Unbalanced forces
c)
Unbalanced forcesStrong forces
d)
Gravitational forces
39.
According to Newton’s Third Law, if someone jumps off a skateboard, the skateboard will roll backwards because -
a)
the mass of the skateboard is the same as the mass of the person jumping off.
b)
the pull of gravity on the person is the same as on the skateboard, regardless of size.
c)
the air resistance on the person is great and the friction on the skateboard is small.
d)
for the force that sent the person forward, there is an equal force pushing back on the skateboard.
40.
During a demonstration of Newton’s laws of motion, a student used the setup shown in Figure 1. The student flicked the index card with a fingertip, and the coin fell straight down into a plastic cup as shown in Figure 2. Which of these best explains why the coin fell straight down into the cup instead of remaining on the index card?
a)
The coin was at rest until the card was removed, so it tended to remain in the same location. Once the card was gone, the unbalanced force of gravity caused the coin to fall.
b)
Moving the card applied an action force on the coin. Since the card was gone, gravity applied a reaction force on the coin.
c)
The card had less mass than the coin, so a smaller force of gravity acted on the card. The larger force of gravity on the coin made it fall.
d)
The acceleration of the coin falling into the cup was equal and opposite to the acceleration of the card.

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