Worksheets6th Grade Chemistry Refresher Assessment 24-25
Total questions: 35
Worksheet time: 18mins
Name
Class
Date
1.
First Name
4 lines
2.
Last Name
4 lines
3.
Block
a)
1
b)
3
c)
4
d)
5
4.
If a substance is made up of only one type of atom, the substance must be which of the following?
a)
Matter
b)
Element
c)
Mixture
d)
Molecule
5.
Which of the following is a true statement?
a)
A water molecule in the gas phase is smaller than a water molecule in the solid phase.
b)
A water molecule in the gas phase is lighter than a water molecule in the solid phase.
c)
A water molecule in the gas phase is the same as a water molecule in the solid phase.
d)
A water molecule in the gas phase is bigger than a water molecule in the solid phase.
6.
Of the following properties, which one is determined by performing a scratch test?
a)
density
b)
malleability
c)
flammability
d)
hardness
7.
What is the volume of both red balls? (Think of the balls as one object.)
a)
3 cm³
b)
6 cm³
c)
2 cm³
d)
4 cm³
8.
The measurement of how much matter an object has is known as
a)
volume
b)
weight
c)
density
d)
mass
9.
What is NOT a characteristic of all matter?
a)
All matter has mass.
b)
All matter is made up of moving atoms.
c)
All matter has volume.
d)
All matter has color.
10.
Matter can best be described as:
a)
the average speed of molecules moving in a substance.
b)
the stuff that makes up all material.
c)
the amount of space an object takes up.
d)
the number of properties in an element.
11.
Water is an element on the periodic table and the chemical symbol is H₂0.
a)
True
b)
False
12.
Look at the four molecules below. The chemical formula for the first molecule is O₂. The chemical formula for water is H₂0 and the chemical formula for carbon dioxide is CO₂.
Select the correct key for the molecules shown above.
a)
Black=Carbon; White=Oxygen Red=Hydrogen
b)
Red=Oxygen; White/Red=Water; Black= Carbon dioxide
c)
White=Hydrogen; Black=Carbon; Red=Oxygen
d)
Black=Hydrogen; White=Oxygen; Red=Carbon
13.
Use the molecules below to identify the chemical formula for Methane.
a)
NH₄
b)
CO₂
c)
CO₄
d)
CH₄
14.
The ball and stick model shown below represents one molecule of hydrazine N₂H₄ , a chemical in rocket fuel.
Based on the model, what is the atomic composition of hydrazine?
a)
Four atoms of hydrogen and two atoms of oxygen.
b)
Four atoms of nitrogen and one atom of oxygen.
c)
Four atoms of oxygen and two atoms of hydrogen.
d)
Two atoms of nitrogen and four atoms of hydrogen
15.
What happens to water molecules when water at 24 degrees celsius is cooled to 0 degrees celsius and freezes?
a)
The molecules become less organized.
b)
The molecules move faster.
c)
The molecules break apart.
d)
The molecules move more slowly.
16.
Temperature is best described as:
a)
the average speed of particles.
b)
the degrees at which a solid changes to a gas.
c)
a measurement of phase changes occurring.
d)
a type of energy.
17.
A pot of water on the stove is boiling rapidly. A dry glass lid is placed on the pot and water begins to form on the lid. Which statement best describes how this happened?
a)
Steam cools and water molecules move closer together.
b)
Hydrogen and oxygen combined to form the water droplets.
c)
Water from outside leaked into the pot.
d)
The gas heated up and became solid water particles.
18.
Which statement best describes the relationship between the kinetic energy of particles and temperature?
a)
Kinetic energy is particle motion and therefore not related to temperature.
b)
As the kinetic energy of matter decreases the temperature also decreases.
c)
As the temperature increases particles lose energy and their kinetic energy decreases.
d)
None of the above statements are true.
19.
The particles in sample A have a higher average kinetic energy than the particles in sample B.
Which sample has the higher temperature?
a)
The temperature is the same because the mass is the same.
b)
Sample A has a higher temperature.
c)
Sample B has a higher temperature.
d)
Particles of matter do not have a temperature.
20.
Which model best represents a change that results from adding thermal energy to a substance in a jar?
a)
A
b)
B
c)
C
21.
A student drew this model to represent liquid water at 75 degrees celsius.
How should the student change the model to best represent the water at 10 degrees celsius?
a)
Show the water molecules with more compression and more space in between each molecule.
b)
Show some of the chemical bonds in the water molecules breaking.
c)
Show some of the water molecules forming chemical bonds with each other.
d)
Show the water molecules with shorter arrows to represent a decrease in kinetic energy.
22.
After swimming, I hung my wet towel outside to dry. How did it dry? Check all that apply.
a)
The water particles move faster and become part of the air.
b)
The water particles break down to hydrogen and oxygen particles and move into the air.
c)
The water particles disappear and no longer exist.
d)
The water particles become gas particles and evaporate into the air.
23.
When a substance changes from a liquid to a solid, which of the following is true? (choose all that apply)
a)
The particles have more kinetic energy.
b)
The particles have less kinetic energy.
c)
The particles are bouncing faster into each other.
d)
The spacing between the particles decreases.
24.
A block of dry ice was placed in a plastic bag and stored in the freezer. The next day the block of dry ice was no longer in the bag.
a)
sublimation
b)
condensation
c)
melting
d)
evaporation
e)
freezing
25.
A jet engine releases water vapor that is cooled by the surrounding air forming tiny drops of water known as contrails.
a)
condensation
b)
melting
c)
evaporation
d)
sublimation
e)
freezing
26.
Menthol gas particles rose to the top of the Erlenmeyer flask, and then cooled forming menthol crystals on the watch glass.
a)
deposition
b)
condensation
c)
melting
d)
evaporation
e)
sublimation
27.
Melted chocolate poured into a candy mold to make a definite shape.
a)
freezing
b)
condensation
c)
melting
d)
evaporation
e)
sublimation
28.
After cooking bacon, I poured the hot bacon grease into a plastic cup. A few hours later, there was a piece of solid grease in the cup.
a)
freezing
b)
condensation
c)
melting
d)
evaporation
e)
sublimation
29.
Friday night is movie night. I took a hard stick of butter out of the fridge and put it in a pan to heat it up. When it was completely heated, I poured the butter onto my bowl of popcorn.
a)
melting
b)
condensation
c)
evaporation
d)
sublimation
e)
freezing
30.
Which of the following is a chemical change?
a)
Melting of ice
b)
Burning of wood
c)
Boiling of water
d)
Dissolving sugar in water
31.
What is the chemical formula for table salt?
a)
NaCl
b)
KCl
c)
CaCl2
d)
MgCl2
32.
Which process involves a liquid changing into a gas?
a)
Condensation
b)
Evaporation
c)
Freezing
d)
Sublimation
33.
Which of the following processes involves a solid changing directly into a gas?
a)
Melting
b)
Condensation
c)
Sublimation
d)
Freezing
34.
What is the term for the amount of space an object occupies?
a)
Mass
b)
Volume
c)
Density
d)
Weight
35.
Which of the following is a physical change?
a)
Rusting of iron
b)
Burning of paper
c)
Boiling of water
d)
Tarnishing of silver
100 %
