Scientific Method
The Water Consumed by Perennial and Annual Flowers
Two students in biology wanted to find out which plant required more water, an annual or a perennial flower. They predicted annuals
would need more water. They decided to use a dandelion as the annual and a rose as the perennial. In three separate test tubes they
placed equal amounts of water. In the first two test tubes they placed the dandelion and the rose, leaving the third test tube without a
flower as a control. Before placing the flowers in the test tubes they cut the stems at an angle. After two days they recorded the
amount of water left in the test tubes. They came back and noticed the water in rose test tube was much less than the water in the
dandelion. Their hypothesis was not supported because the rose used more water.
Identify the question, hypothesis, procedure, results and conclusion for this experiment and write them on your paper.
Density
Answer the following questions regarding density
A piece of wood that measures 3.0 cm by 6.0 cm by 4.0 cm has a mass of 80.0 grams. What is the density of the wood? Would the
piece of wood float in water?
450 grams of gasoline is spilled into a puddle of water. If the density of gasoline is 0.665 g/mL, what volume of gasoline is spilled?
CaCl2 is used as a de-icer on roads in the winter. It has a density of 2.50 g/cm3. What is the mass of 15.0 mL of this substance?
A ball has a mass of 15 g. The volume was measured using a graduated cylinder in which the original volume of the water was 30.0
mL. The volume after the ball was placed in the cylinder was 35.8 mL. What is the density?
Accuracy and Precision
What is the difference between accuracy and precision?
3 groups measured the length of a piece of cardboard that was 11.5 cm long. Their results are below.
Trial
1
2
3
Group A
11.3 cm
11.2 cm
11.4 cm
Group B
10.5 cm
10.5 cm
10.5 cm
Which group was most precise? Why?
Which group was most accurate? Why?
Group C
13.1 cm
10.0 cm
12.0 cm
Lab Safety and Equipment
Identify each piece of lab equipment
Identify each lab warning sign
Give two rules for lab safety students must always follow.
Scientific Notation and Sig Figs
Put the following numbers in scientific notation and in parentheses write how many sig figs are in the number.
10000000000
567070
0.0034040
0.3
300000000003
Put the following numbers in standard form and in parentheses write how many sig figs are in the number.
3.40 x 108
3.000 x 10-4
2.389 x 1010
8 x 10-2
6.02 x 1023
Qualitative and Quantitative Observations
Identify whether the observation is qualitative or quantitative
1. It is light green in color.
2. It taste sour.
3. One leaf is 9 cm long.
4. It makes a loud pop sound.
5. The mass of the computer is 1 1/2 kg.
6. It smells sweet.
7. The temperature of the room increases by 8 degrees C.
8. It gets darker over a period of time.
9. The flower clusters in 3 blooms.
10. Feels very rough.
11. The plant is short.
12. Leaves are stiff.
13. The veins are 3 mm wide.
Write a qualitative example:
Write a quantitative example:
Conversions
1.) How many miles will a person run during a 10 kilometer race?
2.) The moon is 250,000 miles away. How many feet is it from earth?
3.) A family pool holds 10,000 gallons of water. How many cubic meters is this?
4.) The average student is in class 330 minutes/day. How many hours/day is this?
5) How many seconds are there in 1 year?
6) Lake Michigan holds 1.3 x 1015 gallons of water. How many liters is this?