Question

concept 1 open response

1. look at the picture to the right. make a qualitative observation, a quantitative observation, and an inference. (3 pts)
2. name 2 pieces of lab equipment found in a science lab and describe what they are used for. (2 pts)
3. five students each used the same ruler to measure the length of the same pencil. their measurements were: 15.33 cm, 15.34 cm, 15.33 cm, 15.33 cm, 15.34 cm. the actual length of the pencil was 15.85 cm. explain whether the students measurements were accurate, precise, both, or neither. (2 pts)
4. write a hypothesis predicting a relationship between the following independent variable (iv), and dependent variable (dv): (4 pts) iv - amount of caffeine dv - breathing rate of goldfish
5. identify the independent and dependent variables in the hypotheses below: (4 pts) a. if a player practices longer, then he will score more points in the game. b. if students eat a high - protein breakfast, then they will score higher on their biology test.
6. choose one of the hypotheses from question 20. describe how you could set up an experiment to test the hypothesis by listing your experimental groups, control group, and at least 2 constants you would need to have. (4 pts)
7. a hand sanitizer was advertised to be more effective at killing bacteria than any antibacterial soap. students were split evenly into 4 groups to test this claim. groups 1 - 3 washed their hands using the assigned hand sanitizer or soap (see table) and warm water for two minutes, and then dried their hands with a paper towel. group 4 rubbed their hands vigorously for 2 minutes in warm water, without any soap or sanitizer, and then dried their hands with a paper towel. after washing, each students hands were swabbed and the swab was applied to a culture plate and incubated. finally, the bacterial cultures were counted.

treatment bacteria growth (# of bacteria)
group 1: hand sanitizer 28
group 2: soap a 12
group 3: soap b 13
group 4: warm water 24
a. what are the independent and dependent variables in this experiment? (2 pts)
b. what is the control group? (1 pt)
c. list 3 constants. (3 pts)
d. based on the results in the data table, was the advertisement supported or rejected? explain your answer. (2 pts)

1. complete the table on your answer sheet, checking whether the examples in the table would follow more of the technological design process or that of a scientific investigation. note: you may check one or both boxes for each example. (4 pts)

Explanation:

16.

Step1: Qualitative observation

The picture shows a red - colored ship on the water surface with divers and sea creatures like turtles and fish in the water.

Step2: Quantitative observation

There are 2 turtles in the water.

Step3: Inference

The ship might be a research or tour ship, as it is in an area with marine life and divers are present.

Step1: First piece of equipment

Beaker: It is used for holding, mixing, and heating liquids in a lab.

Step2: Second piece of equipment

Test tube: It is used for holding small amounts of substances for reactions or for heating small quantities of materials.

Step1: Define accuracy and precision

Accuracy is how close a measurement is to the true value. Precision is how close repeated measurements are to each other.

Step2: Analyze the students' measurements

The students' measurements (15.33 cm, 15.34 cm, 15.33 cm, 15.33 cm, 15.34 cm) are very close to each other (precise), but the true length is 15.85 cm. So, they are not close to the true value (not accurate).

Answer:

Qualitative: The ship is red and there are divers and sea - creatures. Quantitative: There are 2 turtles. Inference: The ship is likely for research or tours.

17.