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Science 8 > Chemistry > Flashcards

Chemistry Flashcards

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1
Q

Molecules

A

A group of atoms joined together to act as a single unit

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2
Q

Heterogeneous mixture/suspension

A

You can see the different parts

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3
Q

Homogeneous mixture/ solution

A

You can’t see the different parts

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4
Q

Weight

A

The measure of the force of gravity on an object

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5
Q

Mass

A

The measurement of an amount of matter in an object

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6
Q

Volume

A

The amount of space that matter occupies

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7
Q

Volume formula

A

Length x width x height= volume

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8
Q

Density

A

The mass of a material in a given volume

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9
Q

Density formula

A

Mass
_____ = density

Volume

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10
Q

Physical change

A

A change that alters the form or appearance of the matter (but no substance in the matter becomes a different substance)

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11
Q

Chemical change

A

A change in matter that produces one or more new substances

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12
Q

Atom

A

The basic particle from which all elements are made

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13
Q

Characteristic properties

A

State at different temps, boiling, melting, freezing point, hardness, texture, flammability, size, color, density

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14
Q

4 signs of a chemical change

A

Bubbles, precipitate, color change, temp change

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15
Q

Pure substances

A

Made of only one kind of matter, has definite properties

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16
Q

Element

A

A pure substance that cannot be broken down into other substances

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17
Q

Compound

A

Pure substance, made of 2 or more elements that are chemically combined

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18
Q

Mixtures

A

Consists of 2 or more substances that are in the same place but not chemically combined

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19
Q

Solvent

A

The part of the solution present in the largest amount

20
Q

Solute

A

part in the smaller amount

21
Q

Saturated

A

Where so much solute has been added that no more dissolves

22
Q

Concentrated

A

More of the solute is dissolved into the solution

23
Q

Weight formula

A

Mass in kg x 9.8 m/s2= N

24
Q

Chemical equation

A

A shorter easier way to show chemical reactions using symbols

25
Q

Symbol

A

A 1-2 letter set of characters used to identify an element

26
Q

Chemical formula

A

Represent compounds

27
Q

Subscript

A

Used to represent the number of atoms of each kind in a compound

28
Q

Chemical reaction

A

when a chemical change takes place

29
Q

Chemical bond

A

force of attraction between two atoms

30
Q

Reactant

A

the materials you have in the beginning (of a chemical equation)

31
Q

Product

A

what you have after the chemical reaction takes place

32
Q

Electrolysis

A

the chemical reaction commonly used to break down a copper compound

  1. Copper compound is dissolved in water to form a solution
  2. Two metal strips called electrodes are placed in the copper compound solution
  3. Each electrode is attached to a wire, which is connected to a battery
  4. When the current is turned on, one elctrde attracts copper and one attracts the other materials
  5. the first electrode will become coated with copper
33
Q

Solid

A

a substance with particles that are tightly packed together and stay in fixed positions, has definite shape and volume, particles vibrate in place

34
Q

Liquid

A

substance in which particles are free to move, has no definite shape, but definite volume

35
Q

Gas

A

A substance whose particles spread apart, filling all the space available to them, can be easily compressed and has no definite shape or volume

36
Q

Fluid

A

a substance that can flow (liquid and gas)

37
Q

Changes of state

A

Melting, freezing, vaporization(evaporation and boiling, lower air pressure, less energy need to boil), condensation, sublimation(when a solid changes directly into a gas, no liquid state)

38
Q

Endothermic reaction

A

absorbs energy in the form of heat

39
Q

Exothermic reaction

A

releases energy in the form of heat

40
Q

Activation energy

A

the minimum amount of energy needed to start a chemical reaction

41
Q

Amorphous solid

A

solid in which the particles are not arranged in a regular pattern, does not have a distinct melting point, gradually gets softer and softer

42
Q

Crystalline solid

A

solid made of particles that form regular repeating patterns, creating crystals, has a distinct melting point

43
Q

Surface tension

A

the result of the inward pull among the molecules of a liquid that brings the molecules on the surface closer

44
Q

Viscosity

A

the resistance of a liquid to flowing

45
Q

Chemistry

A

the study of the properties of matter and how matter changes

Science 8 (1 decks)

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