8th Grade 2nd 9weeks Exam Pt. 2: Question Preview (ID: 3071)

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Angie is testing whether ammonia and vinegar are acids or bases. Litmus paper helps determine whether a chemical is an acid or a base. A drop of ammonia turns the litmus paper blue, and a drop of vinegar turns the litmus paper red. What can Angie
a) Both of the chemicals are acids.
b) Both of the chemicals are bases.
c) Ammonia is an acid, and vinegar is a base.
d) Ammonia is a base, and vinegar is an acid.

Police can detect speeding motorists with a radar gun. What property of waves enables them to do this?
a) Waves bend when they strike an object.
b) Waves bounce off when they strike an object.
c) Waves bend around barriers.
d) Two waves combine, travel together, and form a new wave.

The chemical formula for a compound that has one Calcium atom and 2 Chlroine atoms is _______.
a) CaCl2
b) CaCl
c) Ca2Cl
d) 3CaCl

Which of the following correctly converts 0.23 kilograms (kg) into grams (g)?
a) 0.0023 g
b) 0.023 g
c) 23 g
d) 230 g

Which of the following is the structure of an atom most like?
a) a forest
b) the solar system
c) a factory
d) a baseball field

Which atomic particles will you find inside of the nucleus of an atom?
a) protons, electrons
b) protons, neutrons
c) neutrons, electrons
d) electrons only

If an element has an atomic number of 12, how many electrons does it have?
a) 18
b) 8
c) 12
d) 24

If an element has an atomic number of 22 and the atomic mass is 48 how many neutrons does it have?
a) 22
b) 26
c) 48
d) 70

Ex. A) A piece of paper is burned. Ex. B) A piece of paper is folded in half. Based on the information above, Scenario A is a __ change and Scenario B is a __ change.
a) physical, chemical
b) physical, physical
c) chemical, physical
d) chemical, chemical

WARNING: Goggles and Aprongs Must Be Worn at ALL Times. This sign was found at the entrance of a chemistry laboratory. It is an important sign because _____.
a) goggles help chemists see better
b) accidents rarely happen in laboratories
c) chemicals can seriously damage eyes and skin
d) chemists will be fined if they do not obey the rules

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