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- 1. Multiple Choice
Which of the following would not be classified as a pure substance?
element
solution
molecule
compound
- 2. Multiple Choice
Which of the following is a correct statement regarding mixtures?
mixtures are composed of one substance
all substances in mixtures are visible at all times
mixtures are composed of more than one substance
mixtures have fixed compositions
- 3. Multiple Choice
A student passes a magnet over 10 grams of a powder. Four grams of the powder stick to the magnet, while 6 grams do not. Which of these identifies the substance?
mixture
element
compound
solution
- 4. Multiple Choice
Which of these will best separate a saltwater solution?
Using paper filtering system
allowing the salt to settle
allowing the water to evaporate
none of the above
- 5. Multiple Choice
Which of the following is a chemical property of sodium?
density of 0.968 g/cm³
silver-white color
soft at room temperature
tarnishes when exposed to air
- 6. Multiple Choice
Which of the following is a physical property?
being black in color
neutralizing acids
burning with oxygen
releasing SO2 gas
- 7. Multiple Choice
Which of the following properties of a substance could change during a physical change?
ability to rust
reactivity with acids
resistance to bending
ability to burn in oxygen
- 8. Multiple Choice
Which is one way a chemical property can be witnessed?
heating a substance to its boiling point
examining a substance under a microscope
observing how one substance interacts with another
passing an electrical current through a substance
- 9. Multiple Choice
The two sides of the above equation appear different. These differences are evidence of a
mass change
chemical change
physical change
keep the change
- 10. Multiple Choice
Which of the following equations is paired correctly with the type of change?
Physical change: NaCl (s) → Na (aq) + Cl- (aq)
Physical change: H2O (s) → H2O (l)
Chemical change: CO2 (s) → CO2 (g)
Physical change: C6H12O6 (s) + 6 O2 (g) → 6CO2 (g) + 6 H2O (l)
- 11. Multiple Choice
Oxygen reacts with iron to produce rust and with hydrogen to produce water. Which statement describes both reactions?
A different mixture is formed in each case.
A different solution is formed in each case.
Both a change of state and of elements is involved.
New molecules are formed but the same elements exist.
- 12. Multiple Choice
What would be the best evidence that two substances are made of different types of matter?
Two substances have different reactions to light.
Two substances have different temperatures.
Two substances have different volumes.
Two substances have different shapes.
- 13. Multiple Choice
Two pieces of the same metal are placed on a table. The pieces of metal have the same density, mass, and texture. Which characteristic must be the ONLY difference between the two samples?
They are made up of a different type of matter.
They have different boiling points.
They have different dimensions.
They contain a different amount of matter per unit volume.
- 14. Multiple Choice
Which of the following descriptions includes an extensive property?
high luster, malleable, and ductile
colorless, odorless, with a freezing point of 0°C
red in color, ductile, with a melting point of 1100°C
yellow in color, malleable, with a mass of 5 grams
- 15. Multiple Choice
Which one of the following properties does not depend on the amount of material present?
weight of a bag of lead pellets
volume of a cylinder of copper
boiling point of a pot of water
heat required to melt an ice cube
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