AnswersAA-F26 Physical ScienceChemical Bonding

Chemical Bonding — Cumulative exam Answers

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1
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How does Bohr’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.
2
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Which statement best describes the explanatory powers of hypotheses and theories?

A
A hypothesis does not provide an explanation but instead only predicts what may happen.
B
A theory does not provide an explanation but instead only predicts what may happen.
C
The explanation given by a theory is well tested and supported by many observations and hypotheses.
D
The explanation given by a hypothesis is well tested and supported by many observations and theories.
3

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
4

A log has a density of .8 g/cm³. What will happen to this log in freshwater, which has a density of 1.0 g/cm³?

A
It will sink.
B
It will float.
C
It will move deeper.
D
It will decrease in density.
5

Read the thermometer.

Question illustration
A
–8°
B
0°
C
25°
D
32°
6

This is how platinum appears in the periodic table.

Question illustration
A
78
B
117
C
195
D
273
7

Based on its location on the periodic table, which metal is likely to be less reactive than both strontium and sodium?

A
magnesium (Mg)
B
barium (Ba)
C
cesium (Cs)
D
rubidium (Rb)
8

Which statement best describes a relationship amongst hypotheses, theories, and laws?

A
A hypothesis is used to explain laws and theories.
B
A law is used to explain a hypothesis and theories.
C
A hypothesis combines several theories.
D
A theory combines several hypotheses.
9

Rosa records the distance that a toy car rolls and the time it takes to cover the distance.What scientific practice is this?

A
collecting data
B
asking a question
C
providing explanations
D
communicating results
10

A cylinder at left with balls evenly spaced throughout the cylinder has an arrow leading to a cylinder at right cylinder with balls in a layer at its bottom.

Question illustration
A
condensation
B
boiling
C
sublimation
D
freezing
11

Which properties do metalloids share with metals?

A
Both are shiny and are brittle.
B
Both are very conductive and are dull.
C
Both are brittle and are gases at room temperature.
D
Both are shiny and are solid at room temperature.
12

After reading a book about parrots, Tani wants to learn more about them. Which question could be answered through scientific investigation?

A
Which bird’s eggs taste the best?
B
What substances make up an eggshell?
C
Which birds have the most beautiful feathers?
D
Which type of bird makes the best pet in an apartment?
13

Look at the graph below.

Question illustration
A
calcium and iron
B
calcium and sodium
C
potassium and magnesium
D
potassium and sodium
14

During a camping trip, Sierra collected dry branches and broke them into smaller pieces. She then placed the sticks in a fire pit and used a match to light the sticks on fire. Next, she propped a metal pan of water over the fire and heated it until the water boiled.

A
physical change: breaking stickschemical changes: lighting the fire, boiling water
B
physical change: boiling waterchemical change: breaking sticks, lighting the fire
C
physical changes: lighting the fire, boiling waterchemical change: breaking sticks
D
physical changes: breaking sticks, boiling waterchemical change: lighting the fire
15

Which describes a value for density?

A
a value for volume, such as m3, divided by a value for mass, such as kg
B
a value for mass, such as kg, divided by a value for volume, such as m3
C
a value for distance, such as m, divided by a value for time, such as s
D
a value for time, such as s, divided by a value for distance, such as m
16

The symbol P represents the element phosphorus. This element’s atomic number is 15. How many protons and electrons are in a P–3 ion?

A
15 protons and 3 electrons
B
12 protons and 15 electrons
C
15 protons and 18 electrons
D
18 protons and 15 electrons
17

What is the first way in which biology researchers present the results of their latest research?

A
through an article published in the newspaper
B
through an e-mail addressed to the scientific community
C
through an interview given to a local TV news reporter
D
through an article published in a scientific journal
18

Which is an example of a chemical change?

A
frying an egg
B
boiling water
C
melting butter
D
chopping onions
19

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
20

An atom of carbon (C) forms covalent bonds with two atoms of oxygen (O) to form carbon dioxide. How are the valence electrons of these atoms rearranged to form the bonds?

A
Electrons are transferred from the carbon atom to the oxygen atoms.
B
Electrons are transferred from the oxygen atoms to the carbon atoms.
C
Many valence electrons are shared between the atoms.
D
A few valence electrons are shared between the atoms.

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