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8th Grade Science > 1st 9 Weeks Review > Flashcards

Flashcards in 1st 9 Weeks Review Deck (30)
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1

What helps you complete a task?

A tool

2

A spring scale measures _____

Force

3

Mass is measured with _____

A balance or triple beam balance

4

Which 2 tools are used to determine the volume of an irregularly shaped pebble?

(Water displacement method) Graduated cylinder and water

5

What is bioengineering?

The application of engineering to living things

6

How do engineers use science?

Engineering uses scientific knowledge to develop new technology.

7

Information gathered from experimentation or observation

Data

8

Observing events, asking questions, and experimentation used to formulate laws and principles to discover more about our natural world.

Science

9

What is technology?

A product or process designed to serve our needs.

10

Using your senses to obtain knowledge

Observation

11

Adaptive Bioengineering

Engineering that results in a product or process that changes living organisms, such as heart surgery, laser eye surgery, etc.

12

Assistive bioengineering

Engineering that results in a product or process that helps living organisms, but does not change them, such as wheelchairs, eyeglasses, and crutches.

13

What is a conceptual model?

A system of ideas.

14

A pattern, plan, or representation of an object or system.

Model

15

Law

A summary of many experiments, observations, and research to explain how something works.

16

What did J.J. Thomson discover, which disproved the idea that atoms are indivisible?

The electron

17

Who created the plum-pudding model?

J.J. Thomson

18

Who was a British chemist who experimented with different substances and published an atomic theory?

Dalton

19

Who found that electrons move in paths, or energy levels?

Bohr

20

An atom's atomic number is also... (2 things)

1. The number of protons in an atom
2. The number of neutrons in an atom (assuming the atom has no overall charge)

21

How do you find the mass number of an atom?

Add the number of protons and the number of neutrons in the nucleus of an atom.

22

If there is an element J-37, what is 37?

The element's atomic mass/mass number

23

If two atoms are isotopes, then ____

They have the same number of protons (and therefore the same element) but a different number of neutrons (and thus a different mass number)

24

What is the atomic mass of an element?

The average mass number of all naturally occurring isotopes of an element.

25

Atom : mass number :: element : ____

Atomic mass

26

Theory

An explanation for some phenomenon based on observation, experimentation, and reason, but cannot be proven.

27

What are the steps of the scientific method?

1. Ask a question
2. Form a hypothesis
3. Test the hypothesis
4. Analyze the data
5. Draw conclusions
6. Communicate results.

28

What are the steps of the engineering design process?

1. Identify a problem and research a need
2. Imagine - develop possible solutions
3. Plan - Build a prototype
4. Create - Test and evaluate the prototype
5. Improve - Modifying the prototype and retesting it

29

What is the independent variable of an experiment?

The factor that purposely varies throughout each experimental group in the experiment in order to test a hypothesis.

30

What is the dependent variable of an experiment?

The result or effect of the independent variable; the outcome that depends on the variable.