Lab Scenario – Complete the Graphic Organizer
Carlos was interested in determining the effect the number of seeds planted in a particular space will have on the growth of the plants. He planted the same type of radish seeds 1 cm deep in identical cups using the same kind of potting mix. In the first cup he planted 5 seeds, in the second 10 seeds, in the third 15 seeds, and in the fourth cup he planted 20 seeds. Each cup received the same amount of water twice a week. He measured the length of the leaves at the end of 3 weeks and recorded his data in the data table below.
Number of Seeds / Length of Leaves1 / 28 cm
5 / 23 cm
10 / 19 cm
15 / 14 cm
20 / 10 cm
Lab Scenario – Complete the Graphic Organizer
A group of students investigated how temperature affects the rate of chemical reactions. They used hydrogen peroxide, which breaks down into oxygen and water, for their experiment. The students measured how long it took to obtain 50 mL of oxygen gas from a given volume of hydrogen peroxide heated to different temperatures. Their data is shown in the table below.
Temperature (°C) / Time (minutes)10 / 33
20 / 16
30 / 8
40 / 4
50 / 2
Lab Scenario – Complete the Graphic Organizer
A study was conducted to determine if safety advertising had any effect on automobile accidents. Different numbers of billboards were put up in Cleveland over a period of four months to see if the number of people hospitalized because of auto accidents was affected. In March, five billboards carried safety messages; in April there were 10, in May there were 15, and in June there were 20. During each of these four months, a record was made of the number of people hospitalized because of accidents.
Month / Number of People HospitalizedMarch / 53
April / 48
May / 38
June / 33
A study was conducted to determine the effect that the amount of exercise has on heart rate. High school students rode bikes for different numbers of kilometers and then their heart rate was measured. One group rode 10 km, a second group rode 20 km, a third group rode 30 km and a fourth group rode 40 km. Following the exercise, the heart rate was immediately measured by counting the pulse for 30 seconds at the wrist.
- What equipment do you need to complete this experiment?
- What lab safety procedures do you need to follow to complete this experiment?
A study was conducted to see if the amount of erosion was affected by the slope of the land. The end of a stream table was raised to four different heights (10cm, 20 cm, 30 cm, 40 cm) in order to make it slope different amounts. (A stream table is a plastic box about 40 cm wide and 100 cm long. Sand or soil is placed in the box and water can be run in at one end.) At each height a liter of water was poured in at one end of the stream table. After the water had run over the soil, the depth of the gully cut by the water was measured.
- What equipment do you need to complete this experiment?
- What lab safety procedures do you need to follow to complete this experiment?
Stefan observed goldfish in a lighted fish tank. He noticed the fish were more active with the light on than with the light off. Stefan decided to investigate whether colored light affected the activity of the fish. He planned an experiment in which he would first use a white bulb, then a red bulb, then a green bulb to light the tank. He would observe the activity of the goldfish when each bulb was switched on.
- What equipment do you need to complete this experiment?
- What lab safety procedures do you need to follow to complete this experiment?
When Greg was studying sound, he wanted to investigate how the length of a column of air can change the pitch of a sound. Greg set up his experiment by filling eight identical bottles with different amounts of water. He then tapped each bottle to see the different pitch that was produced.
- What equipment do you need to complete this experiment?
- What lab safety procedures do you need to follow to complete this experiment?