Rio Salado CHM 130 Midterm Objectives Test
Questions with Correct Answers
Chemistry
A science that studies the composition of substances and the way they interact
with other substances.
Steps of the Scientific Method
1. Observation
2. Hypothesis
3. Experiment
4. Conclusion
Metric system
Length (meter), Volume (liter), Mass (gram), Temp. (C), Time (second)
SI system
Length (meter), Volume (cubic meter), Mass (kilogram), Temp. (kelvin), Time
(second)
Scientific Notation
a coefficient, a power of 10, and a unit of measurement. (Ex. 8.6 x 10-4 g)
Measured Number
,numbers you obtain when you measure a quantity using a measuring tool
Significant Figures
are all the digits including the estimated digit. All nonzero numbers are counted as
significant figures.
Exact Numbers
numbers obtained by counting items or using a definition that compares two units
in the same measuring system.
Kilo-
1 000
mega-
1 000 000
deci-
0.1
centi-
0.01
milli-
0.001
, micro-
0.000 001
Conversion Factors
An equality written as a fraction.
Density
mass/volume (Ex. 68 g/9.5 mL)
Matter
the material that makes up a substance and has mass and occupies space
Pure substance
A type of matter composed of elements and compounds that has a definite
composition
Mixture
the physical combination of two or more substances that does not change the
identities of the mixed substances
Questions with Correct Answers
Chemistry
A science that studies the composition of substances and the way they interact
with other substances.
Steps of the Scientific Method
1. Observation
2. Hypothesis
3. Experiment
4. Conclusion
Metric system
Length (meter), Volume (liter), Mass (gram), Temp. (C), Time (second)
SI system
Length (meter), Volume (cubic meter), Mass (kilogram), Temp. (kelvin), Time
(second)
Scientific Notation
a coefficient, a power of 10, and a unit of measurement. (Ex. 8.6 x 10-4 g)
Measured Number
,numbers you obtain when you measure a quantity using a measuring tool
Significant Figures
are all the digits including the estimated digit. All nonzero numbers are counted as
significant figures.
Exact Numbers
numbers obtained by counting items or using a definition that compares two units
in the same measuring system.
Kilo-
1 000
mega-
1 000 000
deci-
0.1
centi-
0.01
milli-
0.001
, micro-
0.000 001
Conversion Factors
An equality written as a fraction.
Density
mass/volume (Ex. 68 g/9.5 mL)
Matter
the material that makes up a substance and has mass and occupies space
Pure substance
A type of matter composed of elements and compounds that has a definite
composition
Mixture
the physical combination of two or more substances that does not change the
identities of the mixed substances
