Name: _______________________________________Date:____________ Class Period: ___________
Exam #1 Review
1. Know your Lab Safety Rules. List 5 rules that you DON’T know as well as the others.
See your lab safety rules – in reference handouts
2. What are the 3 types of science investigations? Describe each one.
Descriptive – describing or quantifying parts of a natural system. Comparative – involves collecting data
on different populations/organisms, under different conditions, to make comparison. Experimental –
involves a designed test in which variables are changed, controlled and measured to gather evidence to
support or disprove a hypothesis.
3. What is an independent variable? What is a dependent variable? Independent variable – factor or
condition in an experiment that is changed by the scientist. This goes on the X axis. Dependent variable –
factor or condition in an experiment that changes as a result of the independent variable. This is what you
measure and goes on the Y axis.
4. What is a control group? What are constants? A control group is set up without the variable being tested.
Constants are factors that are kept the same in all trials of the experiment.
5. What is the difference between accuracy and precision? Accuracy - how close a measured value is to the
actual true value. Precision – how close the measured values are the each other.
6. What is the difference between qualitative and quantitative data? Quantitative data - observation that
does involve a number/measurement (has magnitude size or amount) Ex. Length, mass, volume.
Qualitative data – observation that does not involve a number/measurement Ex. Presence of odor, color
change
7. What is the difference between an observation and an inference? Inference: assuming you know what
something is. Observation: using your five senses to describe something.
8. What is the difference between intensive and extensive physical properties? List 3 examples of each.
Intensive- properties that do not depend on the amount of matter present. Ex. Density, Color,
Temperature. Extensive – property that DOES depend on the amount of matter present Ex. Mass, Length,
Volume.
9. Know your lab equipment functions and be able to identify them. List the name and function of 5 pieces of
lab equipment that you DON’T know as well as the others. Review your lab equipment notes and
functions! – in reference handouts!
10. Define matter. Matter is anything that takes up space and volume.
11. What are the 5 signs that a chemical change has occurred?
a. Gas produced
d. Energy released or absorbed
b. Color change
e. Not easily reversible
c. Precipitate formed out of a solution
12. Determine if the change is physical or chemical:
a. Salt dissolving in water Phys
b. Frying an egg Chem
c. Iron rusting Chem
d. Molding play-doh Phys
e. Baking a cake Chem
13. Define the following:
a. Physical Property Color, smell, mass,
volume, length, boiling point
14. Define the following:
a. Pure Substance Made up of the same 1
type of substance, can’t be broken down
f.
g.
h.
i.
j.
Milk souring Chem
Water freezing Phys
Cutting paper Phys
Mixing ketchup and mustard Phys
Lighting a match Chem
b. Chemical Property Flammable
combustible, reacts with other
substances
b. Mixture2 or more substances combined;
neither identity is changed. Substances
mixed do not interact with each other.
15. True/False: Compounds can be separated into individual elements by physical means. False
16. What is an alloy? List 3 examples. A mixture of 2 or more metals or a metal and a nonmetal. Ex.
Brass, steel, bronze
17. Classify the following matter as either Pure Substance or Mixture, then as an Element, Compound,
Homogeneous Mixture, or Heterogeneous Mixture:
k. Gold (Au) pure substance - element
q. Water pure substance - compound
l. Air homogenous mixture
r. Kool-Aid homogenous mixture
m. Glucose (C6H12O6) pure substances. Magnesium (Mg) pure substance
compound
element
n. Vegetable Soup heterogeneous mixture
t. Concrete homogeneous mixture
o. Salt Water homogenous mixture
u. Hydrogen Peroxide (H2O2) compound
p. Orange Juice with Pulp heterogeneous
v. Brass homogeneous mixture
mixture
18. Write the formula for each of the following matter examples and classify it as either Element,
Compound, or Mixture (of what?).
Mixture of
Mixture of 2
elements and
different
compounds:
elements
2B2W + 2B
4B + 3W
19. Convert the following numbers into scientific notation:
a. 0.000043 4.3 x 10-5
c. 0.0024 2.4 x 10-3
b. 201,000 2.01 x 105
d. 7100 7.1 x 103
20. Convert the following numbers into standard notation:
a. 2.50 x 106 2,500,000
c. 5.2 x 105 520,000
b. 1.86 x 10-4 0.000186
d. 7.0 x 10-5 0.000070
Count the number of significant figures in the following numbers:
a. 0.00056 2 sig figs; zeroes to the left are never significant
b. 280.0 4 sig figs; zeroes to the right are always significant if there is a decimal
c. 5,300.1 5 sig figs; zeroes in the middle are always significant
d. 75,000 2 sig figs; zeroes to the right with no decimal in the number is never significant
Make sure you study your notes! (Lab Safety Rules, Lab Equipment Functions &
Identification, Science Investigations, Scientific Notation and Significant Figures, Matter,
AND study your definitions!!