CHEM 115 CHAPTERS 1 & 2 QUESTIONS WITH FULLY
SOLVED ANSWERS
Matter -- Answer ✔✔ anything that takes up space & has mass.
_ _ _ _ _ _ _ _ _ _ _
Mass -- Answer ✔✔ how much matter is in a substance
_ _ _ _ _ _ _ _ _ _
Substance -- Answer ✔✔ definite composition & distinct properties
_ _ _ _ _ _ _ _
-water, gold, table sugar
_ _ _
Mixture -- Answer ✔✔ combinations of two or more substances which retain the
_ _ _ _ _ _ _ _ _ _ _ _ _
distinct properties _
-air, milk, soft drinks
_ _ _
Elements -- Answer ✔✔ substances that cannot be separated into simpler substances
_ _ _ _ _ _ _ _ _ _ _
Compounds -- Answer ✔✔ Substances that are composed of two or more atoms/
_ _ _ _ _ _ _ _ _ _ _ _ _
elements that are chemically united in fixed proportions
_ _ _ _ _ _ _
Solids -- Answer ✔✔ Fixed volume & shape
_ _ _ _ _ _ _
Liquids -- Answer ✔✔ fixed volume but takes shape of container
_ _ _ _ _ _ _ _ _ _
Gasses -- Answer ✔✔ No fixed volume; expands to fill container
_ _ _ _ _ _ _ _ _ _
Physical Change -- Answer ✔✔ A change in a substance that does not involve a change in
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
the identity of the substance.
_ _ _ _ _
Chemical Change -- Answer ✔✔ A change that occurs when one or more substances
_ _ _ _ _ _ _ _ _ _ _ _ _ _
change into entirely new substances with different properties.
_ _ _ _ _ _ _
, Atom -- Answer ✔✔ Basic unit of an element that can enter into a chemical reaction.
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
e- -- Answer ✔✔ electrons
_ _ _ _
negatively charged _
discovered by Thompson _ _
mass: 9.11x10^(-31) kg _ _
charge: 1.602x10^(-19) c _ _
p+ -- Answer ✔✔ Protons
_ _ _ _
positively charged _
Thompson
charge: 1.602x10^(-19) c _ _
mass: 1.6726x10^(-27) kg _ _
1840x heavier than e- _ _ _
Nucleus -- Answer ✔✔ dense central core of an atom
_ _ _ _ _ _ _ _ _
-made up of protons & neutrons _ _ _ _ _
N% -- Answer ✔✔ Neutrons
_ _ _ _
neutral; charge = 0 _ _ _
mass: 1.6749x10^(-27) _
Chadwick
Structure of atom (disc. by) _ _ _ _
-atom has __ charge -- Answer ✔✔ Rutherford
_ _ _ _ _ _ _ _
>99% in nucleus _ _
contains protons + neutrons _ _ _
-positive
all atoms of an element have same amount of _____ -- Answer ✔✔ protons
_ _ _ _ _ _ _ _ _ _ _ _ _
______ define the element -- Answer ✔✔ protons _ _ _ _ _ _ _
The atomic mass is based on.... -- Answer ✔✔ atomic mass unit (amu)
_ _ _ _ _ _ _ _ _ _ _ _
1 amu = ___ -- Answer ✔✔ 1/12 mass of a carbon-12 atom
_ _ _ _ _ _ _ _ _ _ _ _
SOLVED ANSWERS
Matter -- Answer ✔✔ anything that takes up space & has mass.
_ _ _ _ _ _ _ _ _ _ _
Mass -- Answer ✔✔ how much matter is in a substance
_ _ _ _ _ _ _ _ _ _
Substance -- Answer ✔✔ definite composition & distinct properties
_ _ _ _ _ _ _ _
-water, gold, table sugar
_ _ _
Mixture -- Answer ✔✔ combinations of two or more substances which retain the
_ _ _ _ _ _ _ _ _ _ _ _ _
distinct properties _
-air, milk, soft drinks
_ _ _
Elements -- Answer ✔✔ substances that cannot be separated into simpler substances
_ _ _ _ _ _ _ _ _ _ _
Compounds -- Answer ✔✔ Substances that are composed of two or more atoms/
_ _ _ _ _ _ _ _ _ _ _ _ _
elements that are chemically united in fixed proportions
_ _ _ _ _ _ _
Solids -- Answer ✔✔ Fixed volume & shape
_ _ _ _ _ _ _
Liquids -- Answer ✔✔ fixed volume but takes shape of container
_ _ _ _ _ _ _ _ _ _
Gasses -- Answer ✔✔ No fixed volume; expands to fill container
_ _ _ _ _ _ _ _ _ _
Physical Change -- Answer ✔✔ A change in a substance that does not involve a change in
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
the identity of the substance.
_ _ _ _ _
Chemical Change -- Answer ✔✔ A change that occurs when one or more substances
_ _ _ _ _ _ _ _ _ _ _ _ _ _
change into entirely new substances with different properties.
_ _ _ _ _ _ _
, Atom -- Answer ✔✔ Basic unit of an element that can enter into a chemical reaction.
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
e- -- Answer ✔✔ electrons
_ _ _ _
negatively charged _
discovered by Thompson _ _
mass: 9.11x10^(-31) kg _ _
charge: 1.602x10^(-19) c _ _
p+ -- Answer ✔✔ Protons
_ _ _ _
positively charged _
Thompson
charge: 1.602x10^(-19) c _ _
mass: 1.6726x10^(-27) kg _ _
1840x heavier than e- _ _ _
Nucleus -- Answer ✔✔ dense central core of an atom
_ _ _ _ _ _ _ _ _
-made up of protons & neutrons _ _ _ _ _
N% -- Answer ✔✔ Neutrons
_ _ _ _
neutral; charge = 0 _ _ _
mass: 1.6749x10^(-27) _
Chadwick
Structure of atom (disc. by) _ _ _ _
-atom has __ charge -- Answer ✔✔ Rutherford
_ _ _ _ _ _ _ _
>99% in nucleus _ _
contains protons + neutrons _ _ _
-positive
all atoms of an element have same amount of _____ -- Answer ✔✔ protons
_ _ _ _ _ _ _ _ _ _ _ _ _
______ define the element -- Answer ✔✔ protons _ _ _ _ _ _ _
The atomic mass is based on.... -- Answer ✔✔ atomic mass unit (amu)
_ _ _ _ _ _ _ _ _ _ _ _
1 amu = ___ -- Answer ✔✔ 1/12 mass of a carbon-12 atom
_ _ _ _ _ _ _ _ _ _ _ _
