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Module 4 Test Review - Physical Science
Test Description: Water
Instructions: Answer all questions to get your test result.
1) Suppose you did an electrolysis on hydrogen peroxide (H2O2.) If it worked properly, which of the following results would you expect:
A
twice as much oxygen as hydrogen
B
equal amounts of hydrogen and oxygen
C
same as with water
2) Epsom Salt has the chemical formula MgSO4. If Mg is the symbol for magnesium, S stands for sulfur, and O represents oxygen, how many of each atom exists in a molecule of Epsom salts?
A
Mg = 0 S = 0 O = 5
B
Mg = 1 S = 1 O = 4
C
Mg = 1 S = 0 O = 5
D
Mg = 1 S = 0 O = 4
3) What is the use of electricity to break a molecule down into smaller units?
A
solute
B
Battery Power
C
Solvent
D
Electrolysis
4) A molecule that has slight positive and negative charges due to an imbalance in the way electrons are shared
A
Ionic molecule
B
Non-Polar Molecule
C
Happy molecule
D
Polar Molecule
5) A liquid substance capable of dissolving other substances
A
solvent
B
Vegetable Oil
C
Solution
D
Solute
6) A substance that is dissolved in a solvent
A
Vegetable Oil
B
Solute
C
Solution
D
Solvent
7) The phenomenon that occurs when individual molecules are so strongly attracted to each other that they tend to stay together, even when exposed to tension
A
Magnetic Pull
B
Pull
C
Tension
D
Cohesion
8) Water that has certain dissolved ions in it – predominately calcium and magnesium ions
A
Soft Water
B
Hard Water
C
Cold Water
D
Hot Water
9) If this molecule has one calcium atom (Ca), three carbon atom (C), and two oxygen atoms (O), what is its chemical formula?
A
CaC2O2
B
CaC3O2
C
Ca1C4O2
D
CaC2O1
10) A molecule has a chemical formula of N2H3. How many total atoms are in the molecule??
A
4
B
6
C
7
D
5
11) Why is water harder in certain regions of the world that in others?
A
The source of the water is the ocean where there is a lot of salt.
B
It is harder because of the ions that have been dissolved in the water at the source.
C
Some places do not treat their water and treatment makes it softer.
D
The treatment plants add different things in the water.
12) A certain molecule is composed of atoms that all pull on electrons with the same strength. This molecule is...
A
Hard
B
ionic
C
Non-Polar
D
Polar
13) A certain molecule is composed of atoms that all pull on electrons with differing strengths. This molecule must be...
A
Polar
B
Hard molecule
C
a solution
D
Non-Polar
14) Why does ice float in water, while the butter sank in the lab Exp. 4.4?
A
Water is unique and the solid form (ice) is actually LESS dense than the liquid form (water). Butter does not do this.
B
Ice weighs less than water so it floats. Liquid butter weighs more than solid butter, so it sank.
C
Because of the salt in the water the ice floated.
D
The butter did float.
15) Why are water molecules polar?
A
The water molecules are sharing ELECTRONS and it makes each atom slighlty positive or negative.
B
The water molecules are sharing NEUTRONS and it makes each atom slighlty positive or negative.
C
The water molecules are sharing PROTONS and it makes each atom slighlty positive or negative.
D
Scientists get these molecules from the polar regions of Earth.
16) A certain substance is composed of molecules that have seven carbon atoms (C) and fifteen hydrogen atoms (H). What is the chemical formula?
A
7C 15H
B
715 CH
C
C7 H15
D
CH715
17) What causes surface tension?
A
Global warming. The gases that are trapped allow the surface of water to be tense.
B
Electrolysis. Energy creates surface tension during the process of electrolysis.
C
Cohesion. The molecules are charges and REALLY want to stay together.
18) Is hard water the result of a city’s water treatment process?
A
Maybe
B
Yes
C
No
19) If a substance does not dissolve in vegetable oil, it is most likely a ....
A
Solute
B
Polar Molecule
C
Non-Polar molecule
D
Solvent
20) If a substance does dissolve in water, it most likely ...
A
Solvent
B
Solution
C
Polar Molecule
D
Non-Polar Molecule
*select an answer for all questions
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