AnswersWA-Physical Science BSpeed and Velocity

Speed and Velocity — Cumulative exam Answers

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21
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When ammonium chloride and water interact, less energy is released from breaking the bonds in the water and ammonium chloride than what is required to form the bonds of the new substance.

A
An endothermic reaction is occurring.
B
An exothermic reaction is occurring.
C
Energy is being released into the surroundings.
D
Energy escapes as light into the surroundings.
22
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Study this image of space.

Question illustration
A
a nebula
B
a red giant
C
a supernova
D
a neutron star
23

At the center, 6 unmarked red balls are interspersed with 4 blue balls marked with plus signs. A green cloud with 2 concentric white lines surrounds the center, with 2 small green balls marked with minus signs on the inner white line and 2 small green balls marked with minus signs on the outer white line.

Question illustration
A
4
B
6
C
10
D
14
24

The diagram shows a toy car on a number line.

Question illustration
A
–4
B
1
C
2
D
4
25

Which best compares and contrasts how John Newlands and Dmitri Mendeleev organized elements?

A
Both Newlands and Mendeleev arranged elements according to their chemical properties, but only Newlands used atomic mass as well.
B
Both Newlands and Mendeleev arranged elements according to their atomic masses, but only Mendeleev used chemical properties as well.
C
Both Newlands and Mendeleev organized elements into groups, but only Newlands used a table with rows and columns.
D
Both Newlands and Mendeleev organized elements into a table with rows and columns, but only Mendeleev named different groups of elements.
26

A researcher is using a particle accelerator in an experiment studying isotopes. How can the researcher change one isotope into a different isotope of the same element?

A
by removing valence electrons
B
by adding valence electrons
C
by adding or removing protons
D
by adding or removing neutrons
27

There are several ways to model a compound. One type of model is shown.

Question illustration
A
CHO
B
C4H9O2
C
C4H8O
D
C3H8O2
28

This chart shows descriptions of the atoms for four different substances.

Question illustration
A
Object 1
B
Object 2
C
Object 3
D
Object 4
29

Zac releases the air from a balloon. Which statement best describes what will happen to the air that was inside the balloon?

A
It will become more compacted.
B
It will remain the shape of the balloon but not the size.
C
It will remain the size of the balloon but not the shape.
D
It will expand to fill the room.
30

Alai is comparing the physical property of two materials. He is hitting each with a hammer to observe what happens. What physical property of the materials is Alai most likely observing?

A
solubility
B
conductivity
C
hardness
D
odor
31

The temperature of a solution can change the solubility of a substance. The chart shows the solubility of the same solute at different temperatures in water.

Question illustration
A
W
B
X
C
Y
D
Z
32

Which statement correctly describes compounds?

A
Compounds cannot be broken down into simpler substances by chemical means.
B
Each compound is composed of one type of molecule.
C
Compounds can be broken down into simpler substances by physical means.
D
Each compound is composed of one type of atom.
33

A solution is oversaturated with solute. Which could be done to decrease the oversaturation?

A
dilute the solution
B
add more solute
C
cool the solution
D
add a different solute
34

An object is moving east, and its velocity changes from 65 m/s to 25 m/s in 10 seconds. Which describes the acceleration?

A
negative acceleration of 4 m/s2
B
positive acceleration of 4 m/s2
C
positive acceleration of 9 m/s2
D
negative acceleration of 9 m/s2
35

The chemical formula for cesium oxide is Cs2O. What is the charge of cesium?

A
+1
B
+2
C
–1
D
–2
36

Examine the image of the Hertzsprung-Russell diagram.

Question illustration
A
cool
B
hot
C
large
D
small
37

Which list correctly names the three types of galaxies?

A
binary, open, globular
B
elliptical, open, binary
C
irregular, spiral, elliptical
D
open, irregular, spiral
38

Jamal is working with three ionic compounds: sodium chloride, calcium sulfide, and barium oxide. His teacher asks him which are the positive ions in each compound.

A
sodium, calcium, and barium
B
barium, sulfur, and oxygen
C
calcium, barium, and chlorine
D
chlorine, sulfur, and oxygen
39

Which coefficient is needed in front of NaNO3 to balance the equation Na2S + Zn(NO3)2 → ZnS + _NaNO3?

A
1
B
2
C
5
D
7
40

Which is an example of negative acceleration?

A
a snowboarder who increases speed when traveling downhill
B
a biker who maintains a constant speed through a race
C
a skateboarder who reduces speed when moving up a hill
D
a runner who fluctuates speed by increasing and decreasing speed

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