AnswersWA-Physical Science BSpeed and Velocity

Speed and Velocity — Cumulative exam Answers

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1
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Which is a pure substance?

A
air
B
nitrogen
C
apple juice
D
tap water
2
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What is determined by calculating the slope of the position vs time graph?

p
position
v
velocity
d
distance
d
displacement
3

How does Rutherford’s model of the atom compare with Thomson’s model?

A
They both describe atoms as small, indivisible spheres.
B
They both describe electrons as moving around the nucleus.
C
They both describe electrons as being surrounded by the positive matter.
D
They both describe atoms as being made up of positive and negative matter.
4

Scientists have changed the model of the atom as they have gathered new evidence. One of the atomic models is shown below.

Question illustration
A
A few of the positive particles aimed at a gold foil seemed to bounce back off of the thin metallic foil.
B
Experiments with water vapor showed that elements combine in specific proportions.
C
Equations were used to identify regions around the nucleus where electrons would likely be.
D
Cathode rays were bent in the same way whenever a magnet was brought near them.
5

In the reaction C + O2 → CO2, 18 g of carbon react with oxygen to produce 72 g of carbon dioxide. What mass of oxygen would be needed in the reaction?

A
18 g
B
54 g
C
72 g
D
90 g
6

The diagram shows Ned’s movement as he left his house and traveled to different places throughout the day.Which reference point should be used to find out how far Ned traveled when he went from the pet store to the swimming pool?

Question illustration
A
V
B
W
C
X
D
Z
7

The table represents the speed of a car in a northern direction over several seconds.

Question illustration
C
Column 1 should be titled “Time,” and Column 2 should be titled “Velocity.”
C
Column 1 should be titled “Velocity,” and Column 2 should be titled “Time.”
C
Column 1 should be titled “Time,” and Column 2 should be titled “Acceleration.”
C
Column 1 should be titled “Acceleration,” and Column 2 should be titled “Time.”
8

Which element is least likely to form chemical bonds?

A
phosphorus (P)
B
helium (He)
C
sodium (Na)
D
carbon (C)
9

Lars is balancing equations with his study group. He is unsure about one equation because each member of the study group came up with a different answer. Which is the proper way to balance the equation Ca(OH)2 + H3PO4 → Ca3(PO4)2 + H2O?

A
Ca(OH)2 + H3PO4 → Ca3(PO4)2 + 6H2O
B
3Ca(OH)2 + 2H3PO4 → Ca3(PO4)2 + 6H2O
C
3Ca(OH)2 + 2H3PO4 → Ca3(PO4)2 + 3H2O
D
Ca(OH)2 + 2H3PO4 → Ca3(PO4)2 + 6H2O
11

Four students are analyzing four different substances and recording their findings in this table.Which most describes this table?

Question illustration
A
Leonna has a solid, Xiao and Blake have liquids, and Amir has a gas.
B
Leonna and Amir have gasses, Xiao has a liquid, and Blake has a solid.
C
Leonna has a solid, Xiao has a liquid, Blake has a gas, and Amir made a mistake.
D
Leonna has a solid, Xiao has a liquid, Blake made a mistake, and Amir has a gas.
12

Which separation procedure is most likely to happen?

A
Freezing a compound will break it down into elements.
B
Filtering a mixture will separate it into substances.
C
Boiling a pure substance will separate it into mixtures.
D
Melting an element will break it down into compounds.
13

Zora wants to dissolve a solute in a solvent quickly. Which best describes what she should do?

A
decrease the pressure
B
decrease the surface area
C
shake it repeatedly
D
place in a refrigerator
14

Which statement best describes the difference between endothermic and exothermic reactions?

A
They are opposites because endothermic reactions require energy and exothermic reactions release energy.
B
They are opposites because endothermic reactions release energy and exothermic reactions require energy.
C
They the same because they are both ways of forming precipitates.
D
They the same because they are both ways of forming gasses.
15

Which is a type of star system?

A
dim stars
B
solar system planets
C
wobbling stars
D
globular clusters
16

Which scientist believed that the probable, not exact, location of the electrons of an atom can be determined by using mathematics?

R
Rutherford
B
Bohr
D
Dalton
S
Schrödinger
17

Which statement best describes balancing equations and the law of conservation of mass?

A
There are more atoms in the reactants than in the products, and the total mass is the same in the reactants and in the products.
B
The number of atoms is the same in the reactants and in the products, and the total mass is the same in the reactants and in the products.
C
There are fewer atoms in the reactants than in the products, and the total mass is less in the reactants than in the products.
D
There are more atoms in the reactants than in the products, and the total mass is higher in the reactants than in the products.
19

Which element has fewer than four dots in its electron dot diagrams?

A
arsenic (As)
B
sulfur (S)
C
krypton (Kr)
D
gallium (Ga)
20

During a test, what can a student use to identify what type and how many atoms are in a chemical compound?

common names
Option
chemical names
Option
the International Union of Pure and Applied Chemistry
Option
the National Chemistry Society
Option
22

Which type of star will become a black hole when it dies?

a
a protostar
a
a supergiant
a
a white dwarf
a
a red dwarf
23

What is a limitation of using a chemical formula, such as C6H12O6, to represent a compound?

T
The chemical formula does not show the types of elements that make up the compound.
T
The chemical formula does not show how the atoms are connected to one another.
T
The chemical formula does not show the number of atoms of each element in a molecule.
T
The chemical formula does not show the chemical symbols of the elements in the compound.

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