Chemical Reactions Review 2 Question Preview (ID: 42121)
Chemistry.
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Which is an example of a chemical reaction?
a) tearing up your quiz because you made a bad grade
b) eating an antacid to calm your upset stomach
c) rubbing your hands together to warm them
d) pouring water on a cut to wash off the germs
Hydrogen and oxygen combine to form water. If you have 12 grams of hydrogen gas + oxygen gas in your reactant, how much water do you have in your product?
a) 24 g
b) 6 g
c) 12 g
d) not enough information to answer this question
Magnesium bromide is an ionic compound with the chemical formula MgBr2. What does the “2” tell you?
a) Bromide has a 2 charge.
b) There are two magnesium ions to every bromide ion.
c) There are two bromide ions for every magnesium ion.
d) Bromide has a 2+ charge.
If the products formed from burning a candle are mostly carbon (C), carbon dioxide (CO2) and Water (H2O), what elements are in the reactant?
a) Carbon, carbon dioxide, water
b) C, CO2, H2O
c) carbon, hydrogen and oxygen
d) Carbon and hydrogen
If atoms of a halogen nonmetal gain one electron, the atoms then have
a) no valence electrons.
b) 7 valence electrons.
c) 8 valence electrons.
d) 17 valence electrons.
When atoms share valence electrons it is known as a
a) covalent bond
b) ionic bond
c) negative bond
d) metallic bond
What is the correct name for the covalent compound CF3?
a) calcium fluoride
b) carbon trifluoride
c) monocarbon tetrafluoride
d) monocarbon trifluoride
When naming ionic compounds you use prefixes.
a) False, prefixes are only used in naming covalent compounds.
b) True, prefixes are used in naming ionic and covalent compounds.
c) False, prefixes are used in naming ionic and covalent compounds.
d) True, prefixes are used in naming ionic compounds ONLY.
The law of conservation of mass states that
a) energy can't be created or destroyed.
b) matter can't be created or destroyed.
c) matter can't be created.
d) matter can't be destroyed.
When 3 g of chlorine is added to 8 grams of sodium, how much sodium chloride is produced?
a) 11 g
b) 5 g
c) 3 g
d) 8 g
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