1st Term Exam Review Pt. 2 - 7th Grade - 2010 Question Preview (ID: 4539)
Practice Questions For 1st 9weeks Exam.
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Normal rainfall is slightly acidic, which means its pH must be
a) less than 2
b) betwen 5 and 7
c) between 2 and 4
d) between 7 and 9
One example of a chemical change is
a) burning paper
b) crushing a can
c) boiling water
d) melting butter
Substances that CANNOT be broken down chemically into other substances are
a) elements
b) compounds
c) mixtures
d) solutions
The density of a block of wood with a volume of 50 cubic centimeters and a mass of 100 grams is
a) 2 g/cm3
b) 0.5 g/cm3
c) 500 g/cm3
d) 5,000 g/cm3
Which of the following is NOT an example of a chemical change?
a) rust forming on an iron fence
b) ice melting in a glass of water
c) using electricity to break down water into hydrogen and oxygen
d) gas burning on a stove
The elements in a column of the periodic table
a) have the same atomic mass
b) have very similar chemical symbols
c) are in the same period
d) have similar properties
Which group contains the most elements?
a) metalloids
b) nonmetals
c) metals
d) transition elements
A neutral solution has a pH of
a) 3
b) 5
c) 7
d) 9
Which particles in atoms have a negative electric charge?
a) electrons
b) protons
c) neutrons
d) nuclei
The nucleus of an atom has a positive charge because the nucleus contains
a) electrons
b) neutrons
c) protons
d) mass
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