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Eighth Grade (Grade 8) Chemistry Questions

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Grade 8 :: Acids and Bases by aswindell
Which of the following are examples of acids?
  1. vinegar
  2. ammonia
  3. vitamin c
  4. alcohol
  5. oranges
  6. car batteries
  7. baking soda
  8. blood
Grade 8 :: Biochemistry by rebmidwife
The process where cells obtain energy from sugar molecules is called:
  1. biotic
  2. nitrogen cycle
  3. respiration
  4. food chains
Grade 8 :: Reactions by doliver701
Lucy noticed that her coin collection had begun to tarnish. Some of the metal in the coins had begun to change color. The formation of tarnish is most similar to which of the following changes?
  1. shredding a piece of paper into hundreds of tiny strips
  2. dropping a dinner plate on the floor
  3. melting ice cubes in a glass of juice
  4. burning a piece of paper to ashes in a fireplace
Grade 8 :: Matter by CaryBloomquist
A gas has
  1. a definite shape and volume.
  2. a definite shape, but no definite volume.
  3. no definite shape or volume.
  4. no definite shape, but a definite volume.
Grade 8 :: Bonds and Mixing by doliver701
Compare and contrast mixtures and compounds. Which statement is true about mixtures and
compounds?
.
  1. Both mixtures and compounds are the same throughout.
  2. Mixtures and compounds are made of two or more elements in a definite proportion.
  3. Mixtures must be separated by chemical methods and compounds by physical methods.
  4. Mixtures contain two or more elements physically combined and compounds contain two or more elements chemically combined.
Grade 8 :: Properties of Matter by CaryBloomquist
Hardness, temperature, color, size, and smoothness are all
  1. states of matter
  2. physical properties of matter
  3. chemical properties of matter
  4. used to describe elements but not compounds
Grade 8 :: Matter by CaryBloomquist
Sublimation is a change from a
  1. solid to a liquid.
  2. gas to a liquid
  3. solid to a gas
  4. liquid to a solid
Grade 8 :: Matter by CaryBloomquist
During a change of state, such as melting or freezing, a substance's temperature
  1. increases
  2. decreases
  3. remains constant
  4. increases during melting and decreases during freezing
Grade 8 :: Molecules and Compounds by Ms_VThomas
A compound differs from a mixture in that a compound always has a
  1. homogeneous composition
  2. maximum of two components
  3. minimum of three components
  4. heterogeneous composition
Grade 8 :: Periodic Table and Elements by CaryBloomquist
The periodic table is organized so the periods are numbered and run
  1. horizontally.
  2. vertically.
  3. diagonally.
  4. in a figure eight.
Grade 8 :: Matter by CaryBloomquist
Vaporization that takes place inside a liquid is called
  1. evaporation
  2. boiling
  3. condensation
  4. sublimation
Grade 8 :: Periodic Table and Elements by doliver701
Aluminum is a metal found in the 4th column of the periodic table. What statement
is true about Aluminum and the other elements in that column?
  1. All the elements are nonreactive
  2. All the elements are in the same period.
  3. All the elements have the same number of protons.
  4. All the elements have similar chemical properties.
Grade 8 :: Properties of Matter by outom964
Grade 8 :: Bonds and Mixing by CaryBloomquist
What joins 2 atoms together in a covalent bond?
  1. protons
  2. nuclei
  3. neutrons
  4. electrons
Grade 8 :: Acids and Bases by LBeth
Grade 8 :: Acids and Bases by LBeth
Which set of substances listed is correctly sequenced from most to least acidic?
  1. pH = 3, pH = 2, pH = 9
  2. pH = 7, pH = 8, pH = 9
  3. pH = 1, pH = 3, pH = 6
  4. pH = 8, pH = 10, pH = 14
Grade 8 :: Properties of Matter by NinaDashananJones
Angel's favorite bike begins to rust. The rust is an example of which of the following?
  1. Physical change
  2. Exothermic reaction
  3. Endothermic reaction
  4. Chemical change
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