Question

reviewing content
choose the letter that best answers the question or completes the statement.

1. the application of knowledge to solve practical problems is known as

a. science.\tb. curiosity.
c. technology.\td. experimentation.

1. which is not a branch of natural science?

a. physical science\tb. life science
c. earth science\td. social science

1. what is the purpose of an experiment?

a. to communicate data
b. to test a hypothesis
c. to prove a scientific law
d. none of the above

1. a representation of an object or event is called

a. a scientific law.\tb. a model.
c. a hypothesis.\td. a variable.

1. which value is equivalent to 5×10^6?

a. five thousand\tb. fifty thousand
c. five million\td. fifty million

1. what is the si base unit of mass?

a. gram\tb. kilogram
c. milligram\td. pound

1. an electric generator produces 10 megawatts. this amount is equivalent to

a. 10,000 watts.\tb. 1,000,000 watts.
c. 10,000,000 watts.\td. 0.010 watt.

1. which of the following is a ratio of equivalent measurements that is used to convert a quantity expressed in one unit to another unit?

a. slope\tb. conversion factor
c. derived unit\td. density

1. when the ratio of two variables is constant, their relationship can be described as

a. inversely proportional.
b. interdependent.
c. directly proportional.
d. parallel.

1. which of the following would best suit data that describe how a part relates to the whole?

a. line graph\tb. bar graph
c. circle graph\td. scientific notation
understanding concepts

1. give an example of a case where the branches of natural science appear to overlap.
2. what is the goal of a scientific method?
3. how are controlled experiments useful?
4. suppose you perform an experiment, and the resulting data do not support your hypothesis. what is the next step you might take?
5. what are some safety precautions that you should follow when working in the laboratory?
6. what is scientific notation?
7. what are the si base units for length and temperature?
8. how do derived units differ from base units?
9. how is the precision of a calculated result related to the precision of the measurements used in the calculation?
10. how can you convert a temperature expressed in degrees celsius to kelvins?
11. which of the following graphs describes a direct proportion?
12. why is it important for scientists to communicate their results?

Explanation:

Step1: Recall definition of technology

Technology is the application of knowledge to solve practical problems.

Step2: Identify non - natural science branch

Social science is not a branch of natural science. Natural science includes physical, life, and Earth science.

Step3: Understand purpose of experiment

The purpose of an experiment is to test a hypothesis.

Step4: Recall definition of model

A representation of an object or event is called a model.

Step5: Calculate value of scientific notation

$5\times10^{6}=5000000$, which is five million.

Step6: Know SI base unit of mass

The SI base unit of mass is the kilogram.

Step7: Convert megawatts to watts

1 megawatt = 1000000 watts, so 10 megawatts = 10000000 watts.

Step8: Recall conversion factor definition

A conversion factor is a ratio of equivalent measurements used to convert a quantity from one unit to another.

Step9: Define directly proportional relationship

When the ratio of two variables is constant, their relationship is directly proportional.

Step10: Choose graph for part - whole relationship

A circle graph best suits data that describe how a part relates to the whole.

Step11: Example of natural science overlap

Biophysics is an example where biology (life science) and physics (physical science) overlap.

Step12: Goal of scientific method

The goal of the scientific method is to test ideas and find answers through observation and experimentation.

Step13: Usefulness of controlled experiments

Controlled experiments are useful because they allow scientists to isolate and test the effect of a single variable.

Step14: Next step if data doesn't support hypothesis

If the data do not support the hypothesis, you might revise the hypothesis and perform new experiments.

Step15: Laboratory safety precautions

Some safety precautions include wearing safety goggles, aprons, and following proper handling of chemicals.

Step16: Definition of scientific notation

Scientific notation is a way of writing numbers as a product of a number between 1 and 10 and a power of 10.

Step17: SI base units for length and temperature

The SI base unit for length is the meter and for temperature is the kelvin.

Step18: Difference between derived and base units

Base units are fundamental units, while derived units are combinations of base units.

Step19: Precision relationship

The precision of a calculated result is related to the precision of the measurements used in the calculation; the result cannot be more precise than the least - precise measurement.

Step20: Celsius to kelvin conversion

To convert from degrees Celsius to kelvins, add 273.15 to the Celsius temperature.

Step21: Graph of direct proportion

A direct proportion is described by a straight - line graph passing through the origin, so graph B.

Step22: Importance of scientist communication

It is important for scientists to communicate their results so that others can verify, build on, or challenge the findings.

Answer:

1. c. technology
2. d. social science
3. b. to test a hypothesis
4. b. a model
5. c. five million
6. b. kilogram
7. c. 10,000,000 watts
8. b. conversion factor
9. c. directly proportional
10. c. circle graph
11. Biophysics (biology and physics overlap)
12. To test ideas and find answers through observation and experimentation
13. They allow scientists to isolate and test the effect of a single variable
14. Revise the hypothesis and perform new experiments
15. Wearing safety goggles, aprons, proper chemical handling etc.
16. A way of writing numbers as a product of a number between 1 and 10 and a power of 10
17. Meter for length, kelvin for temperature
18. Base units are fundamental, derived units are combinations of base units
19. The result cannot be more precise than the least - precise measurement
20. Add 273.15 to the Celsius temperature
21. B
22. So that others can verify, build on, or challenge the findings