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Science > Test Reveiw 1 - Grade 7 > Flashcards

Test Reveiw 1 - Grade 7 Flashcards

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Biology 101 flashcards
1
Q

Physical science

A

the study of matter, energy, and the changes they undergo.

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2
Q

Energy

A

Energy is the ability to do work.

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3
Q

Matter

A

Anything that has mass or takes up space.

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4
Q

Chemistry

A

The study of the properties of matter and how matter changes.

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5
Q

Science

A

A process of gathering knowledge about the natural world.

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6
Q

Physics

A

The study of matter and energy and how they interact.

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7
Q

How do we measure matter?

A

System International (SI) The metric system

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8
Q

Mass

A

The amount of matter in the object
Measured in grams (g), kilograms (kg), triple beam balance
Measured by: electronic balance, triple beam balance

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9
Q

Length

A

THe distance from one point to another on a straight line
Measured in: meters (m), kilometers (km), centimeters (cm), millimeters (mm)
Measured in: metric ruler, meter stick, metric tape

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10
Q

Weight

A

A measure of the force of gravity on an object
Measured in: newtons
Measured by: Spring Scale

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11
Q

Volume

A

That amount of space an object takes up
Measured in: liter (L), millimeter (ml) (liquid)
Measured by: metric ruler, beaker, radiated cylinder

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12
Q

Density

A

I love (mv) density
The amount of matter in a certain space
Measured in grams

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13
Q

KHDBDCM

A 
Kilo
Hecto
Deka
Base Unit
Deci
Centi
Milli
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14
Q

Model

A 
A representation of an object or system 
Types:
Physical models
Mathematical Models
Conceptual Models
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15
Q

Physical Models

A

Ex: Globe, Cell Model

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16
Q

Mathematical Models

A

Ex: e=mc2, weather forecast

17
Q

Conceptual Models

A

Ex: time, the Big Bang

18
Q

Theory

A

An explanation for many hypotheses and and observations

Ex: theory of relativity

19
Q

Law

A

A summary of many experimental results and observations. A law tells you how things work. Laws are not the same as theories. Laws only tell you what happens, not why it happens.
Ex: law of gravity

20
Q

Physical Property

A

Information about matter that can be observed or measured without changing the matters identity.
Ex: color, texture, volume, weight, height, Oder, magnetism, conductor of electricity, strength, flexibility, density

21
Q

State of matter

A

Solid, liquid, gas

22
Q

Thermal Conductivity

A

The rate at which a substance transfers heat. Plastic foam is a poor conductor.

23
Q

Solubility

A

The ability of a substance to dissolve in another substance. Flavored drink mix dissolves in water. Property: soluble. Solute dissolves into the solvent.

24
Q

Ductility (Ductile)

A

The ability to be pulled into a wire. Copper is often used to make wiring, because it is ductile.

25
Q

Malleability (malleable)

A

The ability of a substance to be rolled or pounded into thin sheets. Aluminum can be rolled into sheets to make foil.

26
Q

Physical Changes

A

Changes that do not change the identity of the matter involved

27
Q

Chemical Properties

A

Describe matter based on its ability to change matter into new matter that has different properties. These are hard to observe without seeing them in action. Ex: flammability and reactivity

28
Q

Reactivity

A

Ex: rusting - iron oxide
Patina - copper oxide
Tarnish - silver oxide

29
Q

Characteristic Properties

A

The most useful in identifying a substance. These properties are almost always the same no matter what the sample size. They can be chemical or physical properties.

30
Q

Chemical changes

A

When one or more substances are changed into new substances with different properties.
Chemical changes are harder to reverse than physical changes.
The new substance has a different composition than the former substances.

31
Q

Composition

A

THe way the matter is arranged in the substance

Science (12 decks)

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