Rio Salado CHM 130 Midterm
Objectives Test Questions with
Correct Answers 2025-2026 Updated.
Chemistry - Answer A science that studies the composition of substances and the way they
interact with other substances.
Steps of the Scientific Method - Answer 1. Observation
2. Hypothesis
3. Experiment
4. Conclusion
Metric system - Answer Length (meter), Volume (liter), Mass (gram), Temp. (C), Time
(second)
SI system - Answer Length (meter), Volume (cubic meter), Mass (kilogram), Temp. (kelvin),
Time (second)
Scientific Notation - Answer a coefficient, a power of 10, and a unit of measurement. (Ex. 8.6
x 10-4 g)
Measured Number - Answer numbers you obtain when you measure a quantity using a
measuring tool
Significant Figures - Answer are all the digits including the estimated digit. All nonzero
numbers are counted as significant figures.
Exact Numbers - Answer numbers obtained by counting items or using a definition that
compares two units in the same measuring system.
Kilo- - Answer 1 000
mega- - Answer 1 000 000
, milli- - Answer 0.001
micro- - Answer 0.000 001
Conversion Factors - Answer An equality written as a fraction.
Density - Answer mass/volume (Ex. 68 g/9.5 mL)
Matter - Answer the material that makes up a substance and has mass and occupies space
Pure substance - Answer A type of matter composed of elements and compounds that has a
definite composition
Mixture - Answer the physical combination of two or more substances that does not change
the identities of the mixed substances
Elements vs. Compounds - Answer 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.
Homogeneous mixture - Answer the composition of the substance in the mixture is uniform
(ex. air, seawater)
Heterogeneous mixture - Answer the components of the mixture are visible (ex. oil and
water)
Physical properties - Answer can be observed or measured without affecting the identity of
the substance.
Chemical properties - Answer indicate the ability of a substance to change to a new
substance
Objectives Test Questions with
Correct Answers 2025-2026 Updated.
Chemistry - Answer A science that studies the composition of substances and the way they
interact with other substances.
Steps of the Scientific Method - Answer 1. Observation
2. Hypothesis
3. Experiment
4. Conclusion
Metric system - Answer Length (meter), Volume (liter), Mass (gram), Temp. (C), Time
(second)
SI system - Answer Length (meter), Volume (cubic meter), Mass (kilogram), Temp. (kelvin),
Time (second)
Scientific Notation - Answer a coefficient, a power of 10, and a unit of measurement. (Ex. 8.6
x 10-4 g)
Measured Number - Answer numbers you obtain when you measure a quantity using a
measuring tool
Significant Figures - Answer are all the digits including the estimated digit. All nonzero
numbers are counted as significant figures.
Exact Numbers - Answer numbers obtained by counting items or using a definition that
compares two units in the same measuring system.
Kilo- - Answer 1 000
mega- - Answer 1 000 000
, milli- - Answer 0.001
micro- - Answer 0.000 001
Conversion Factors - Answer An equality written as a fraction.
Density - Answer mass/volume (Ex. 68 g/9.5 mL)
Matter - Answer the material that makes up a substance and has mass and occupies space
Pure substance - Answer A type of matter composed of elements and compounds that has a
definite composition
Mixture - Answer the physical combination of two or more substances that does not change
the identities of the mixed substances
Elements vs. Compounds - Answer 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.
Homogeneous mixture - Answer the composition of the substance in the mixture is uniform
(ex. air, seawater)
Heterogeneous mixture - Answer the components of the mixture are visible (ex. oil and
water)
Physical properties - Answer can be observed or measured without affecting the identity of
the substance.
Chemical properties - Answer indicate the ability of a substance to change to a new
substance
