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Science > Grade 9 Chem > Flashcards

Grade 9 Chem Flashcards

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1
Q

What is the difference between a Physical Change and a Chemical Change?

A

A physical change in a substance doesn’t change what the substance is, it changes the physical properties. In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed.

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2
Q

What is the difference between Physical Properties and Chemical Properties?

A

A physical property is an aspect of matter that can be observed or measured without changing it. A chemical property may only be observed by changing the chemical identity of a substance. This property measures the potential for undergoing a chemical change.

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3
Q

Amount of matter per unit volume of a substance

A

Density

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4
Q

Solid, liquid, gas

A

States of matter

Solid: lots of attraction,

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5
Q

Ability of a substance to be hammered or bent into different shapes

A

Malleability

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6
Q

Ability of a substance to dissolve in a solvent

A

Solubility

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7
Q

Ability of a substance to be pulled into a wire

A

Ductility

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8
Q

Describes how thick a liquid is/ability of a liquid to flow

A

Viscosity

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9
Q

Describes how much light can pass through a substance

A

Luminance

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10
Q

Describes how shiny a substance is

A

Lustre

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11
Q

A measure of a substance’s resistance to being scratched/dented

A

Hardness

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12
Q

The shape of the particles of a solid

A

Cube-like, attracted to one another a lot

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13
Q

Sawing wood

A

Physical change: the object is still wood, it’s just cut in half

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14
Q

Boiling water

A

Physical change: the water only has heat added, it’s still the same water, but just in a different state of matter (maybe)

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15
Q

Burning magnesium

A

Chemical change: The oxygen in the flame mixes with the magnesium to make magnesium oxide, a new substance

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16
Q

Cutting vegetables

A

Physical change: the object is still vegetables, they’re just cut in half

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17
Q

Car rusting

A

Chemical change: the moisture, the metal, and the oxygen are mixed together, energy is transferred, and a new substance is made

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18
Q

Baking a cake

A

Physical the Chemical change: pouring the batter with the water is just changing the appearance of the batter. The baking part, the components react to the heat which expands the elements and makes the outside harder

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19
Q

Ice melting

A

Physical change: The substance is not being mixed with anything other than heat, the state of matter is only changed

20
Q

Solid

A

Close together, vibrates, very attracted

21
Q

Liquid

A

Kind of close together, moves around more than a solid, less attracted than solid

22
Q

Gas

A

Far apart, moves randomly, not attracted at all

23
Q

Magnesium properties

A

very lustrous, precipitates when mixed with water (powder), malleable

24
Q

Chemical change signs CPHGOTN

A

Color change, bubbles of gas are formed, a precipitate (solid) forms, heat or light is given off (or heat is taken in), change in odor, taste, new substance

25
Q

A clear colorless liquid is split into two different gases. The clear colorless liquid can be classified as a ______________________ because it is made of _____________ or more different elements. The two gases are classified as ______________________ because they cannot be _____________________ down into smaller substances. The liquid is most likely ____________ and the two gases that make up the liquid are ____________________ and _____________________.

A

A clear colorless liquid is split into two different gases. The clear colorless liquid can be classified as a compound because it is made of two or more different elements. The two gases are classified as elements because they cannot be broken down into smaller substances. The liquid is most likely water and the two gases that make up the liquid are hydrogen and oxygen.

26
Q

How would you test for the presence of oxygen or hydrogen?

A

Use either a glowing splint or a lit splint and place it in the test tube. If the gas is oxygen (glowing splint) the splint will ignite. If the gas id hydrogen (lit splint) a pop sound will occur ant the splint will suddenly get brighter then fade out.

27
Q

How would you test for the presence of carbon dioxide?

A

A lit splint flame is immediately extinguished

28
Q

Group

A

A bunch of elements on the periodic table that are in the same column that have similar characteristics

29
Q

Period

A

A bunch of elements on the periodic table that are in the same row and have the same number of electron shells. The period number is the number of electron shells that element has.

30
Q

CH4

A

Carbon tetrahydride

31
Q

Ammonia

A

NH3

32
Q

Physical change signs

A

Change of state, change of size, change of colour

33
Q

Pure substance

A

Only has one type of particle, could be a compound

34
Q

Heterogenous vs. Homogenous

A

Hetero: can see different particles in the mixture

Homo: can’t see different particles in mixture

35
Q

Solution

A

Homo mixture (can’t see different particles)

36
Q

Alloy

A

Solution of a metal and another element

37
Q

Molecule

A

Group of 2 or more atoms held together by chemical bonds

38
Q

Compound

A

Made up of molecules. Smallest component is a molecule (eg. H2O)

39
Q

Bohr-Rutherford diagram

A

Nucleus contains protons and neutrons, electrons following the outer circle contains electrons. (2,8,8,18)

40
Q

Atomic mass

A

Average mass of all isotopes of that element

41
Q

Atomic number

A

Rounded atomic mass. Number of protons and electrons

42
Q

Alkali metals

A

Far left, very reactive

43
Q

Alkaline earth metals

A

Second left, kind of reactive

44
Q

Halogens

A

Second right, most reactive non-metals

45
Q

Noble gases

A

Far right, very stable

46
Q

Middle of the table

A

Transition metals

47
Q

Binary compound

A

Two elements only, has to me a metal and non-metal (eg. NaCl - Sodium chloride)

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