Module 4 Test Review - Physical Science Question Preview (ID: 27285)


Water. TEACHERS: click here for quick copy question ID numbers.

Suppose you did an electrolysis on hydrogen peroxide (H2O2.) If it worked properly, which of the following results would you expect:
a) same as with water
b) equal amounts of hydrogen and oxygen
c) twice as much oxygen as hydrogen
d)

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 = 0 O = 5
c) Mg = 1 S = 1 O = 4
d) Mg = 1 S = 0 O = 4

What is the use of electricity to break a molecule down into smaller units?
a) Solvent
b) solute
c) Electrolysis
d) Battery Power

A molecule that has slight positive and negative charges due to an imbalance in the way electrons are shared
a) Non-Polar Molecule
b) Polar Molecule
c) Ionic molecule
d) Happy molecule

A liquid substance capable of dissolving other substances
a) solvent
b) Solute
c) Solution
d) Vegetable Oil

A substance that is dissolved in a solvent
a) Solvent
b) Solute
c) Solution
d) Vegetable Oil

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) Cohesion
b) Tension
c) Pull
d) Magnetic Pull

Water that has certain dissolved ions in it – predominately calcium and magnesium ions
a) Hot Water
b) Cold Water
c) Soft Water
d) Hard Water

If this molecule has one calcium atom (Ca), three carbon atom (C), and two oxygen atoms (O), what is its chemical formula?
a) CaC2O1
b) Ca1C4O2
c) CaC3O2
d) CaC2O2

A molecule has a chemical formula of N2H3. How many total atoms are in the molecule??
a) 5
b) 7
c) 6
d) 4

Why is water harder in certain regions of the world that in others?
a) The treatment plants add different things in the water.
b) Some places do not treat their water and treatment makes it softer.
c) It is harder because of the ions that have been dissolved in the water at the source.
d) The source of the water is the ocean where there is a lot of salt.

A certain molecule is composed of atoms that all pull on electrons with the same strength. This molecule is...
a) Polar
b) Non-Polar
c) Hard
d) ionic

A certain molecule is composed of atoms that all pull on electrons with differing strengths. This molecule must be...
a) Polar
b) Non-Polar
c) Hard molecule
d) a solution

Why does ice float in water, while the butter sank in the lab Exp. 4.4?
a) Ice weighs less than water so it floats. Liquid butter weighs more than solid butter, so it sank.
b) Water is unique and the solid form (ice) is actually LESS dense than the liquid form (water). Butter does not do this.
c) The butter did float.
d) Because of the salt in the water the ice floated.

Why are water molecules polar?
a) Scientists get these molecules from the polar regions of Earth.
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) The water molecules are sharing ELECTRONS and it makes each atom slighlty positive or negative.

A certain substance is composed of molecules that have seven carbon atoms (C) and fifteen hydrogen atoms (H). What is the chemical formula?
a) C7 H15
b) CH715
c) 7C 15H
d) 715 CH

What causes surface tension?
a) Electrolysis. Energy creates surface tension during the process of electrolysis.
b) Cohesion. The molecules are charges and REALLY want to stay together.
c) Global warming. The gases that are trapped allow the surface of water to be tense.
d)

Is hard water the result of a city’s water treatment process?
a) Yes
b) Maybe
c) No
d)

If a substance does not dissolve in vegetable oil, it is most likely a ....
a) Solvent
b) Polar Molecule
c) Non-Polar molecule
d) Solute

If a substance does dissolve in water, it most likely ...
a) Solvent
b) Polar Molecule
c) Non-Polar Molecule
d) Solution

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