- 1. Enodothermic reactions release energy.
A) True
B) False
- 2. An ice cube melting is an example of a phase change (solid to a liquid).
A) False
B) True
- 3. Cutting paper is an example of a physical change.
A) True
B) False
- 4. In an endothermic reaction the temperature increases.
A) True
B) False
- 5. How many atoms are present in the molecule NaCl?
A) 2
B) 3
C) 1
D) 4
- 6. Reactants are located to the _______ of the yield sign.
A) middle
B) left
C) end
D) right
- 7. Products are located to the ______of the yeild sign.
A) middle
B) end
C) right
D) left
- 8. What type of chemical reacation releases energy?
A) Exothermic
B) Chemical
C) Endothermic
D) Physical
- 9. In chemical reactions the Law of _____________of Mass states that matter cannot be created or destroyed.
A) Chemistry
B) Math
C) Physics
D) Conservation
- 10. Which of the following pieces of information tells how many energy levels an atom has?
A) the period number
B) the atomic number
C) the number of valence electrons
D) the group number
- 11. Nuclear Fission is the process of splitting a nucleus into _____ nuclei.
A) 3
B) 1
C) 4
D) 2
- 12. Fission means "to _________."
A) add
B) subtract
C) multipy
D) divide
- 13. Nuclear Fusion is the combing of 2 nuclei to form ______ nucleus.
A) four
B) three
C) two
D) one
- 14. Which of the following is NOT a property of metals?
A) dull
B) ductile
C) malleable
- 15. The ability of a substance to be stretched into thin wire is-
A) malleable
B) ductile
C) wirey
D) skinny
- 16. The ability of a substance to be pounded into thin sheets, or shaped into a form is-
A) ductile
B) foil
C) malleable
D) flat
- 17. When atoms gain or lose electrons, they become
A) ions
B) isotopes
C) brightly colored
D) completely different elements
- 18. When atoms gain or lose neutrons, they become
A) brightly colored
B) isotopes
C) ions
D) completely differnt elements
- 19. When the number of protons equals the number of electrons in an atom, the overall charge is
A) neutral
B) positvie
C) negative
- 20. Do metals tend to gain or lose electrons?
A) gain
B) lose
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