AnswersIL-Physical Science A-CRAcids and Bases in Solution

Acids and Bases in Solution — Cumulative exam Answers

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Which element would most likely have chemical properties similar to that of magnesium (Mg)?

A
Ar
B
Ca
C
F
D
Ni
2
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Which example illustrates a chemical change?

A
shredding paper
B
smashing a soda can
C
burning wood
D
chopping wood
3

Who reported four “element” classifications, but included some substances that were combinations of elements rather than true elements in his listing?

A
Henry Moseley
B
Dmitri Mendeleev
C
Antoine Lavoisier
D
Johann Dobereiner
4

This chart lists four kinds of polymers and their sources.What can be known about all four polymers, despite their differences?

Question illustration
A
They come from living things.
B
They share ionic carbon bonds.
C
They are at least 100 monomers long.
D
They are made of repeating subunits.
5

Kai was 200 meters north of the library when he remembered he had to return some books to the library. It took him 200 seconds to do the round trip.Which best describes Kai’s roundtrip?

A
His speed was 1 m/s, and his velocity was 0.
B
His speed was 2 m/s, and his velocity was 0.
C
His speed was 1 m/s, and his velocity was 1 m/s north.
D
His speed was 2 m/s, and his velocity was 2 m/s south.
6

Which term best describes all atoms in ionic bonds?

A
stable
B
unstable
C
positively charged
D
negatively charged
7

Rutherford used positively charged particles to investigate the structure of the atom. The results surprised him, and he developed the atomic model shown below.

Question illustration
A
A few positive particles bounced back because they bounced off of the net formed by the ovals.
B
A few positive particles bounced back because they were pushed away from the positive center.
C
Most positive particles passed through because of the empty space between the outer edge and the center.
D
Most positive particles passed through because they were attracted by the small particles moving around the center.
8

Which is a pure substance?

A
air
B
nitrogen
C
apple juice
D
tap water
9

Rolf prepares four solutions using different solutes as shown in the table below.Which solution is unsaturated?

Question illustration
A
Solution A
B
Solution B
C
Solution C
D
Solution D
10

Nio conducts a science experiment. He puts yeast into a bottle with water and sugar, and then caps the bottle with a balloon. He returns two hours later and notices there are bubbles on the surface of the mixture in the bottle and that the balloon has inflated, but there are no other apparent changes.

A
a non-chemical change, because there are no indicators of chemical changes taking place
B
a chemical change, because the mixture changed color
C
a chemical change, because a gas was produced
D
a non-chemical change, because the changes that occurred are reversible
11

When balanced, which equation would have the coefficient 3 in front of any of the reactants?

A
Zn + HCl ZnCl2 + H2
Option A
B
H2SO4 + B(OH)3 B2(SO4)3 + H2O
Option B
C
Fe + AgNO3 Fe(NO3)2 + Ag
Option C
D
C2H4O2 + O2 CO2 +H2O
Option D
12

Which type of reaction is Mg + S → MgS?

A
polymerization
B
synthesis
C
replacement
D
decomposition
13

Which property would xenon most likely have?

A
It is stable.
B
It is a solid.
C
It is flammable.
D
It is silver in color.
14

Formaldehyde is an organic compound. Each molecule includes two hydrogen (H) atoms, one oxygen (O) atom, and one carbon (C) atom. Below are the dot structures for each of these elements.Which diagram shows how the covalent bonds most likely form in a formaldehyde molecule?

Question illustration
A
Option
B
Option
C
Option
D
Option
15

Suna passes an electric current through a sample of clear, colorless, and odorless liquid. As the experiment continues, bubbles form, and the volume of liquid decreases. Suna collects samples of two colorless, odorless gases that bubble out of the liquid. One of the gases burns. Neither the original liquid nor the other gas burns.Which is the best explanation of her results?

A
The electric current changed some of the sample to gas even though the sample was not breaking down. Therefore, the original liquid is a compound.
B
The electric current released a gas that was odorless and colorless, like the original sample. Therefore, the original liquid is an element.
C
The sample was broken down by the electric current and formed a new substance that could burn. Therefore, the original liquid is a compound.
D
The sample lost some of its volume, but the gas still had the same chemical makeup as the original sample. Therefore, the original liquid is an element.
16

The equation for water is H2 +O2 → H2O. To balance the equation, which coefficient should be placed in front of H2 and H2O?

A
1
B
2
C
3
D
4
17

When hydrogen peroxide bubbles, it is undergoing a chemical change. Which statement best describes what is happening?

A
The atoms in hydrogen peroxide are breaking apart and forming new types of molecules.
B
The atoms in hydrogen peroxide are breaking apart and recombining into the original molecules.
C
The molecules of hydrogen peroxide remain intact as new types of molecules form and move out of the liquid.
D
The molecules of hydrogen peroxide remain intact but move more quickly to allow evaporation.
18

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.
19

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
20

Why do natural polymers not pose as much of an issue in landfills as synthetic polymers?

A
Natural polymers are cheap to recycle, and synthetic polymers are expensive to recycle.
B
Natural polymers are expensive to recycle, and synthetic polymers are cheap to recycle.
C
Natural polymers are not biodegradable, and synthetic polymers are biodegradable.
D
Natural polymers are biodegradable, and synthetic polymers are not biodegradable.

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