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Unit 1-Gr. 8 Science Assessment Review-2015
Test Description: Matter and Conservation of Mass
Instructions: Answer all questions to get your test result.
1) Why did the mass of the closed balloon-bottle system stay the same?
A
the temperature changed
B
people weighed it wrong
C
the molecules grew bigger when heat was added
D
the same number of atoms were conserved
2) A student has one liter of cotton and one liter of copper pennies. Which statement best compares the masses of the two samples?
A
The mass of the cotton is the same as the mass of the pennies.
B
The mass of the cotton is less than the mass of the pennies.
C
The masses cannot be compared without a balance.
D
The mass of the cotton is greater than the mass of the pennies.
3) Which of the following substances can be separated into several elements?
A
water
B
aluminum
C
zinc
D
nitrogen
4) Sugar is composed of carbon, hydrogen, and oxygen. Sugar is an example of which of the following?
A
a mixture
B
a compound
C
an atom
D
an electron
5) Which of the following is the smallest form of matter?
A
a compound
B
a mixture
C
an atom
D
an electron
6) When 1 gram of water is evaporated in a sealed container, the volume of the water vapor increases but the mass remains constant. Why?
A
The temperature of the water remains constant.
B
The number of atoms in the water remains constant.
C
The distance between water molecules remains constant.
D
The pressure acting on the water remains constant.
7) Which statement is true about Conservation of Mass?
A
Elements combine to form compounds.
B
Air is made of particles, but has no mass.
C
Matter can never be created or destroyed.
D
Matter is made up of particles too small to see.
8) Which of the following equations is balanced?
A
Na + O2 ---------Na2O
B
Na + O2 ---- 2Na2O
C
4Na + O2-------- 2Na2O
D
2Na + O2 -------- 2Na2O
9) Which of the following equations is balanced?
A
4Al + 3O2 ------------- 2Al2O3
B
Al + O2 -------- Al2O3
C
4Al + 2O2 ----------- 2Al2O3
D
Al + 2O2 -------- 2Al2O3
10) How many molecules are in the compound sodium carbonate 3Na2CO3?
A
6
B
3
C
1
D
7
11) How many different atoms are in the compound sodium carbonate (Na2CO3)?
A
6
B
7
C
3
D
1
12) How many different elements are in the compound sodium carbonate (Na2CO3)?
A
3
B
6
C
1
D
7
13) Which of the following is formed when two or more different elements combine chemically?
A
a compound
B
an atom
C
a mixture
D
a molecule
14) Which statement best explains what happens to the atoms in gold (Au) when the temperature of the metal is increased?
A
The motion of the atoms becomes very orderly.
B
The atoms move more slowly.
C
The atoms move more quickly.
D
The motion of the atoms stays the same.
15) Which statement best describes what happens to the motion of the water molecules after heat is added?
A
The molecules move apart and move more slowly.
B
The molecules come together and move more quickly.
C
The molecules move apart and move more quickly.
D
The molecules come together and move more slowly.
16) How does increasing heat energy affect hydrochloric acid (HCl) molecules?
A
The motion of the molecules stops.
B
The motion of the molecules increases.
C
The motion of the molecules decreases.
D
The motion of the molecules is at a constant rate.
17) Which of the following substances would keep the same volume but different shape if they were moved from a rectangular container to a round shaped container?
A
a cell phone
B
10 mL of juice
C
air in a balloon
D
steam from a pot
*select an answer for all questions
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