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Elements Etc
Test Description: Review for test
Instructions: Answer all questions to get your test result.
1) Which is only a physical change?
A
Melting of ice
B
Souring of milk
C
Rusting of iron
D
Burning of oil
2) A chemical change always
A
releases heat
B
releases energy
C
absorbs heat
D
forms one or more new substances
3) Food cooks faster at higher temperature. This is because, as the temperature increases, the rate of a chemical reaction usually
A
none of the above
B
stays the same
C
increases
D
decreases
4) A molecule of carbon dioxide (CO2) is made of one atom of carbon and two atoms of oxygen.
A
an element because it is made of one type of atom
B
an element because it is made of two types of atoms
C
a compound because it is made of two types of atoms
D
a compound because it is made of one type of atom
5) Which subatomic particles are found in the nucleus of an atom?
A
Positively charged protons
B
Positively charged electrons
C
Negatively charged neutrons
D
Negatively charged electrons
6) Atoms in a molecule are joined together by
A
Chemical bonds
B
Magnitism
C
Electricity
D
Gravity
7) Which of the following substances is NOT an element?
A
carbon
B
calcium
C
hydrogen
D
water
8) Hydrogen is not longer used in balloons because it is too
A
metallic
B
stable
C
reactive
D
malleable
9) A mixture that can be separated with a magnet is
A
sugar and salt
B
salt and water
C
salt and iron
D
sugar and water
10) Which of the following substances an example of a compound?
A
oxygen
B
sand and water
C
sodium
D
water
*select an answer for all questions
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