AnswersFL-2003310-Physical Science CRCumulative Exam

Cumulative Exam — Cumulative exam Answers

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1
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What happens to the total mass of a substance undergoing a physical change?

A
It stays the same.
B
It doubles.
C
It triples.
D
It is reduced.
2
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Which best describes the behavior of atoms in a solid substance that is melting into a liquid?

A
Atoms that once slid past one another now only vibrate in place.
B
Atoms that once slid past one another now expand in all directions.
C
Atoms that were once in fixed positions now slide past one another.
D
Atoms that were once in fixed positions now spread freely in all directions.
3

What else is produced during the replacement reaction of magnesium and hydrochloric acid?Mg + 2HCl H2 + ________

Question illustration
A
MgCl2
B
Mg2Cl2
C
Mg2Cl
D
MgCl
4

The atoms in a sample are close together but can slide past one another. As the atoms lose energy, they move slower. The atoms become locked in place because of attractive forces between them.

A
gas to solid
B
gas to liquid
C
liquid to solid
D
solid to liquid
5

A company that manufactures cookware has conducted numerous trials to see which metal needs the least amount of energy (measured in Joules, J) to be raised to high temperatures, and records the averages in a table. Which claim will this company most likely make?

Question illustration
A
Aluminum pans are the most energy-efficient cookware.
B
Copper pans are the most energy-efficient cookware, but they cost the most.
C
Iron pans require less energy to heat up than copper frying pans, but they cost less.
D
Copper pans require the most energy to heat up.
6

An atomic physicist determines that an atom is composed of 8 positively charged particles and has a mass of 15 amu. Which is the best conclusion that can be drawn?

A
The atom has 7 neutrons and 8 protons.
B
The atom has 7 electrons and 8 protons.
C
The atom has 8 neutrons and 7 electrons.
D
The atom has 8 electrons and 7 protons.
7

What would happen to life on Earth if all the liquid fresh water were used up?

A
All organisms would adapt to using salt water.
B
Organisms would carry out life functions without water.
C
Animals would be affected, but some desert plants would survive.
D
Life could no longer exist on Earth.
8

The chemical equation below summarizes the process of photosynthesis.6CO2 + 6H2O + energy à 6O2 + C6H12O6Where is the energy shown in the equation transferred as a result of photosynthesis?

A
into water
B
into the air
C
into sugars
D
into the ground
9

For the equation BaCl2 + Na2SO4 → BaSO4 + 2NaCl, how many chlorine atoms are on the reactants side and on the products side?

A
reactants: 1; products: 1
B
reactants: 1; products: 2
C
reactants: 2; products: 1
D
reactants: 2; products: 2
10

Hamid made this table to organize his notes on the properties of acids and bases.Which property is in the wrong column?

Question illustration
A
taste sour
B
react with carbonates
C
conduct electric current
D
form hydrogen gas with metals
11

Which type of reaction is Mg + S → MgS?

A
polymerization
B
synthesis
C
replacement
D
decomposition
12

Which solution has the greatest number of hydrogen ions?

A
blood, pH = 7.2
B
lemon juice, pH = 2
C
soda, pH = 3.5
D
bleach, pH = 13.5
13

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.
14

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.
15

Fluorine has an atomic number 9. It is in period 2 of the periodic table. The diagram shows the electron dot diagram of a fluorine atom.

Question illustration
A
two
B
seven
C
nine
D
seventeen
16

What are the coefficients for the reaction _Cl2O5 + _H2O → _HClO3 once it is balanced?

A
1, 1, 1
B
1, 1, 2
C
1, 2, 2
D
2, 1, 1
17

Which statement describes the relationship between science and society?

A
Science is rarely influenced by the needs of society.
B
Science and society are independent.
C
Science and society have different goals.
D
Scientists find new ways to address societal concerns.
18

Which substance is important in making plastics?

A
zinc hydroxide
B
ammonia
C
acetic acid
D
nitric acid
19

Which example illustrates a chemical change?

A
shredding paper
B
smashing a soda can
C
burning wood
D
chopping wood
20

While playing soccer, Carla slides across one of the lines on the field. When she stands up, what base does she dust off?

A
calcium hydroxide
B
ammonium hydroxide
C
zinc hydroxide
D
potassium hydroxide

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