Rio Salado CHM 130 Midterm Objectives with Complete
Solutions
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
, Rio Salado CHM 130 Midterm Objectives with Complete
Solutions
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
Elements vs. Compounds - - Elements are pure substances containing only 1 type of
matter, which cannot be broken down by chemical methods.
Compounds are our substances that contain 2 or more elements, with a definite
composition, the can be broken down to simpler substances only by chemical methods.
Solutions
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
, Rio Salado CHM 130 Midterm Objectives with Complete
Solutions
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
Elements vs. Compounds - - Elements are pure substances containing only 1 type of
matter, which cannot be broken down by chemical methods.
Compounds are our substances that contain 2 or more elements, with a definite
composition, the can be broken down to simpler substances only by chemical methods.
