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history > Science > Flashcards

Science Flashcards

1
Q

What does a chemist study?

A

Study of chemicals and how to change them.

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2
Q

What does a physicist do?

A

Study’s the behaviour of natural and manufactured substances.

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3
Q

What does an ecologist do?

A

Study how living things interact.

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4
Q

What does an astronomer do?

A

Study of planets, stars and the universe.

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5
Q

What is an inference?

A

A likely explanation for what is observed.

Eg- observation : smelling onion

Inference: someone might be onions cooking

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6
Q

What is an aim?

A

What you intend to do in the investigation.

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7
Q

What is a variable?

A

A quality or condition in an experiment that is likely to change.

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8
Q

What is a fair test?

A

Something that is a fair test on all scales.

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9
Q

What is a controlled variable?

A

What I will keep the same.

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10
Q

What is an independent variable?

A

What I will change.

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11
Q

What is a dependant variable?

A

What I will measure.

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12
Q

How can we tell it’s reliable?

A

Doing the experiment repeated times for a fair outcome.

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13
Q

What is a pure substance?

A

A substance that contains only one kind of particle.

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14
Q

What is an impure substance.

A

A mixture that contains more than one type of particle mixed together.

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15
Q

What is a solution?

A

A solution is a mixture made up of one substance dissolved in another.

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16
Q

What is a solute?

A

Is the substance that is dissolved.

17
Q

What is a solvent?

A

Is the substance that the solute is dissolved in.

18
Q

What does soluble mean?

A

A substance that dissolves in a solvent.

19
Q

What does dissolve mean?

A

To make a solution by mixing liquids.

20
Q

What does insoluble mean?

A

A solid that will not dissolve in a solvent.

21
Q

What does immiscible mean?

A

Two liquids which do not dissolve in each other.

22
Q

What does miscible mean?

A

Two liquids that mix evenly together.

23
Q

Define concentration.

A

The concentration of a solution is a measure of how much solute has been dissolved in a fixed amount of solvent.

No much dissolved solute = dilute.

Lots of solute dissolved = concentrated solution.

24
Q

What is a suspension?

A

A mixture of a gas or liquid and an insoluble substance the i soluble substance settles to the bottom when the mixture is left to stand.

25
Q

What is sediment?

A

The material that collects when the suspensions are left to stand (usually at the bottom).

26
Q

Define emulsion.

A

A colloid with droplets of one liquid spread even,y through another.

27
Q

Define : colloid.

A

A mixture in which extremely small particles of one substance we spread evenly throughout another.

28
Q

What does a biologist study?

A

Living things such as plants, animals and micro-organisms.

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