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year 9 chemistry > Elements, Compounds And Mixtures > Flashcards

Elements, Compounds And Mixtures Flashcards

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1
Q

What is an atom

A

An atom is the simplest particle of an element that can exist on its own.

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2
Q

How many atoms does a molecule have

A

A molecule has 2 or more atoms, joined together, the atoms may be the same or different

ie- molecules of element (2 or more atoms that are identical)
Molecules of a compound (2 or more different atoms)

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3
Q

What are the 2 liquids in the periodic table

A

Hg and br

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4
Q 
Do these element conduct electricity?
Aluminium (metal)
Zinc (metal)
Copper (metal)
Iron (metal)
Carbon (non metal)
Sulfur (non metal)
A 
Aluminium-conducts electricity 
Zinc-conducts electricity
Copper-conducts electricity
Iron-conducts electricity 
Carbon-conducts electricity
Sulfur-doesn't conduct electricity
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5
Q 
Are these elements shiny or dull?
Copper
Zinc
Aluminium
Carbon
Sulfur
A 
Copper-shiny
Zinc-shiny
Aluminium-shiny
Carbon-dull
Sulfur-dull
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6
Q 
Do these elements have high density or low
Lead 
Iron
Sulfur 
Carbon
A

Lead-high (11.08)
Iron-high (7.76)
Sulfur-low (2.25)
Carbon-low (0.74)

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7
Q

Are these elements hard or brittle
Iron
Sulfur

A

Iron-hard

Sulfur-brittle

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8
Q

Do these elements have high or low melting points:
Iron
Sulfur

A

Iron-high (1538 degrees)

Sulfur- low (113 degrees)

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9
Q

Are these elements malleable (can be beaten into shape) or not malleable
Lead
Sulfur

A

Lead-yes

Sulfur-no

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10
Q

What does brittle mean

A

Soft

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11
Q

What is electrical conductivity

A

This is a measure of materials ability to conduct an electric current (allow electricity to flow through it)

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12
Q

What is density

A

Density is how heavy something is for its size. It’s how massive it is divided by how big it is. So something that’s very heavy and small has a high density. Density is mass divided by volume

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13
Q

What is lustre (shiny)

A

This is a measure of a materials ability to reflect light

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14
Q

What is meant by the term malleable

A

A substance is said to be malleable if it can be beaten out of shape without breaking.

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15
Q

What are the conclusions from the experiment to do with density and electrical conductivity etc etc

A 
Metals:
Conductors
Malleable
Metals are hard
Metals have high density
Metals are shiny
Non metals:
Non conductors 
Not malleable
Non metals are brittle
Non metals are dull
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16
Q

List some properties of metallic elements

A

Good conductors of electricity
Usually have high melting and boiling points
Shiny solids
Usually malleable and ductile
Good conductors of heat
All are solids at room temperature except murcury

17
Q

List some properties of non metallic elements

A

Poor conductors of heat
Usually have low melting and boiling points
Usually dull
Poor conductors of electricity (graphite is an exception)
Can be a gas, solid, or liquid at room temperature
Non metallic solids tend to be soft and brittle (diamond is an exception)

18
Q

What is the definition of a compound

A

A compound is a material that is made up of two or more different elements that are chemically joined together

19
Q 
Name the compound:
Element 1=magnesium, Element 2= oxygen
Element 1=sodium, Element 2= chlorine
Element 1=oxygen, Element 2= iron
Element 1=tin, Element 2= oxygen
Element 1=aluminium, Element 2= bromine
Element 1=nickel, Element 2= iodine
Element 1=zinc, Element 2= sulfur
Element 1=lithium, Element 2= nitrogen
A 
Compound:
Magnesium oxide
Sodium chloride
Iron oxide
Tin oxide
Aluminium bromide
Nickel iodide
Zinc sulfide
Lithium nitride
20
Q 
Name the compound:
El 1=nickel, el 2=sulfur, el 3=oxygen
El 1=magnesium, el 2=nitrogen, el 3=oxygen
El 1=sodium, el 2=nitrogen, el 3=oxygen
El 1=copper, el 2=sulfur, el 3=oxygen
El 1=calcium, el 2=carbon, el 3=oxygen
A 
Compound:
Nickel sulphate
Magnesium nitrate
Sodium nitrate
Copper sulfate
Calcium carbonate
21
Q

The formation of magnesium oxide:

Which elements make up magnesium oxide?

A

Magnesium and oxygen

22
Q

The formation of magnesium oxide:

How do you make magnesium oxide

A

Burn magnesium in air

23
Q

The formation of magnesium oxide:

What do you observe during the experiment

A

A bright white light

24
Q

The formation of magnesium oxide:

What does magnesium oxide look like

A

A white ash

25
Q

The formation of magnesium oxide:

What is the word equation for this reaction

A

Magnesium+oxygen->magnesium oxide

26
Q

Formation of iron sulfide:

Which elements make up iron sulfide

A

Iron and sulfur

27
Q

Formation of iron sulfide:

How do you make iron sulfide

A

Heat a mixture of iron and sulfur

28
Q

Formation of iron sulfide:

What do you observe during the experiment

A

The mixture glows

29
Q

Formation of iron sulfide:

What does iron sulfide look like

A

A black solid

30
Q

Formation of iron sulfide:

What is the word equation for this reaction

A

Iron+sulfur->iron sulfide

31
Q

What is the definition of a mixture

A

A mixture is 2 or more substances mixed together which are easy to separate

32
Q

Investigating the properties of iron, sulfur and iron sulfide:
What are the appearances of these materials?
Iron
Sulfur
Iron-sulfur mixture
Iron sulfide

A

Iron-grey, shiny solid
Sulfur-yellow, dull powder
Iron-sulfur mixture-grey flecks with yellow flecks
Iron sulfide- dark grey solid, not shiny

33
Q

Investigating the properties of iron, sulfur and iron sulfide:
Are these materials magnetic of non magnetic?
Iron
Sulfur
Iron-sulfur mixture
Iron sulfide

A

Iron- magnetic
Sulfur- non magnetic
Iron-sulfur mixture- iron magnetic, Sulfur non magnetic
Iron sulfide- non magnetic

34
Q

Investigating the properties of iron, sulfur and iron sulfide:
Are these materials soluble or insoluble in xylene?
Iron
Sulfur
Iron-sulfur mixture
Iron sulfide

A

Iron- insoluble
Sulfur- soluble
Iron-sulfur mixture- iron insoluble, Sulfur soluble
Iron sulfide-insoluble

35
Q

Investigating the properties of iron, sulfur and iron sulfide:
What are the observations of these materials when they react with acid?
Iron
Sulfur
Iron-sulfur mixture
Iron sulfide

A

Iron-bubbles
Sulfur-no reaction
Iron-sulfur mixture-bubbles
Iron sulfide-rotten eggs smell

36
Q

Investigating the properties of iron, sulfur and iron sulfide:
What is the conclusion to this experiment?

A

Different elements have different properties. In a mixture the elements behave as if they were in their own. A compound is a new material that has its own properties

37
Q

What is the definitions of an element

A

Elements are materials that cannot be split up into anything simpler by chemical methods. They contain only one type of atom

year 9 chemistry (6 decks)

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