Unit 1-Gr. 8 Science Assessment Review-2015 Question Preview (ID: 26621)
Matter And Conservation Of Mass.
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Why did the mass of the closed balloon-bottle system stay the same?
a) the temperature changed
b) the molecules grew bigger when heat was added
c) the same number of atoms were conserved
d) people weighed it wrong
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 masses cannot be compared without a balance.
b) The mass of the cotton is the same as the mass of the pennies.
c) The mass of the cotton is greater than the mass of the pennies.
d) The mass of the cotton is less than the mass of the pennies.
Which of the following substances can be separated into several elements?
a) nitrogen
b) zinc
c) water
d) aluminum
Sugar is composed of carbon, hydrogen, and oxygen. Sugar is an example of which of the following?
a) an atom
b) a compound
c) an electron
d) a mixture
Which of the following is the smallest form of matter?
a) an atom
b) a compound
c) an electron
d) a mixture
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 pressure acting on the water remains constant.
c) The number of atoms in the water remains constant.
d) The distance between water molecules remains constant.
Which statement is true about Conservation of Mass?
a) Matter can never be created or destroyed.
b) Elements combine to form compounds.
c) Air is made of particles, but has no mass.
d) Matter is made up of particles too small to see.
Which of the following equations is balanced?
a) Na + O2 ---------Na2O
b) 2Na + O2 -------- 2Na2O
c) 4Na + O2-------- 2Na2O
d) Na + O2 ---- 2Na2O
Which of the following equations is balanced?
a) Al + O2 -------- Al2O3
b) Al + 2O2 -------- 2Al2O3
c) 4Al + 2O2 ----------- 2Al2O3
d) 4Al + 3O2 ------------- 2Al2O3
How many molecules are in the compound sodium carbonate 3Na2CO3?
a) 1
b) 3
c) 6
d) 7
How many different atoms are in the compound sodium carbonate (Na2CO3)?
a) 1
b) 3
c) 6
d) 7
How many different elements are in the compound sodium carbonate (Na2CO3)?
a) 1
b) 3
c) 6
d) 7
Which of the following is formed when two or more different elements combine chemically?
a) an atom
b) a compound
c) a molecule
d) a mixture
Which statement best explains what happens to the atoms in gold (Au) when the temperature of the metal is increased?
a) The atoms move more slowly.
b) The atoms move more quickly.
c) The motion of the atoms stays the same.
d) The motion of the atoms becomes very orderly.
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 move apart and move more quickly.
c) The molecules come together and move more slowly.
d) The molecules come together and move more quickly.
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.
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) air in a balloon
b) steam from a pot
c) a cell phone
d) 10 mL of juice
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