Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Year 8- Science > Chemistry > Flashcards

Chemistry Flashcards

You may prefer our related Brainscape-certified flashcards:
Biology 101 flashcards
1
Q

What is an element?

A

A substance that contains only one type of atom.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Can elements be broken down into other substances?

A

no, because since the substance breaks down when electricity passes through it, it can’t be an element.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is an atom?

A

They are the smallest parts of elements that can exist. They make up everything physical and are too small for us to see.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is a compound?

A

It is a pure substance which is made up of atoms of 2 or more elements.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What does hydrogen go round in?

A

Pairs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is hydrogen?

A

An element which is a gas at room temperature, when mixed with air and ignited with a spark it will explode.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is a molecule?

A

It is 2 or more atoms strongly bonded together.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is oxygen?

A

An element which exists as molecules of 2 atoms. It is also a gas at room temperature, with no colour or smell.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is water?

A

It is a molecule made up of two elements , hydrogen and oxygen. Therefore, water is a compound.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Why are water molecules different to oxygen and hydrogen molecules?

A

Because water has a higher boiling point than the others so it is a liquid.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

If it ends with ate what does it have?

A

Oxygen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

How many atoms are there in a molecule of water?

A

3

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Compounds made up of oxygen and another element have ___ ____ _____. What is the second word called?

A

two word names. The second word is oxide. etc. aluminium + oxygen = aluminium oxide.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

When does the Elements name change to ide?

A

when a metal and non-metal combined.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

oxygen -
nitrogen - ?
sulphur - ?
ine - ?

A

oxide.
nitride.
sulphide.
ide.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

For compounds containing ___ elements and oxygen the ending of the other _________ changes to ___.

A
  1. 2
  2. Non-metal
  3. ate
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What is a chemical formula?

A

It shows the elements present in a compound, as well as the number of atoms of each element.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Hydroxides - ?
Nitrates - ?
Sulphates - ?
Carbonates - ?

A

OH
NO3
SO4
CO3

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Mono -
Di -
Tri -

A

1
2
3

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What is a Polymer?

A

A polymer is a VERY large molecule made up from repeating units/ monomers.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

What is a natural polymer?

A

Polymers made by plants and animals, like wool, cotton, starch and rubber.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

What is a synthetic polymer?

A

Polymers made in chemical reactions.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

What is a monomer?

A

A molecule that can be bonded to other identical molecules to form a polymer.

24
Q

What are vertical columns called in the periodic table?

A

Groups

25
Q

What are horizontal rows called in the periodic table?

A

Periods

26
Q

What does the periodic table arrange the elements in?

A

It arranges them in groups according to their properties.

27
Q

Group 1 - periodic table: Give an example of what the elements in group 1 are used for.

A

Batteries, fireworks

28
Q

Group 1 - periodic table: What are the elements called?

A

Alkali metals

29
Q

Group 1 - periodic table: The elements are called Alkali metals, but which one is not a metal?

A

Hydrogen

30
Q

Who created the Periodic Table?

A

Mendeleev

31
Q

Periodic Table: If the elements are on the left of the staircase what does that indicate?

A

That they are metals

32
Q

Group 1 - periodic table: The boiling point and melting point increases/ decreases from bottom to top/ top to bottom.- choose

A

Decreases, top to bottom

33
Q

Group 1 - periodic table: When the elements react with water what do they produce?

A

Hydrogen gas, which moves the elements around on the surface.

34
Q

Group 1 - periodic table: Why does the water turn purple when the elements come in contact with it?

A

Because they make alkaline solution.

35
Q

Group 1 - periodic table: What is the pattern with the reactions?

A

It gets vigorous as you go down the table.

36
Q

Group 1 - periodic table: What are the affects in common with lithium, sodium and potassium?

A

They all fizz which means gas is being made in a chemical reaction, move and the water turns purple because of the alkali. When you put any of them in.

37
Q

Rubidium and caesium are also Group 1 elements. Predict what observations you would see if they reacted with water.

A

Rubidium would cause more fizzing than the rest and maybe also catch on fire more than potassium.

Caesium would cause even more fizzing and would cause a bigger fire than Rubidium.

38
Q

Periodic Table: What scientist came up with the law of octaves?

A

Newlands

39
Q

What are group 7 elements on the periodic table known as?

A

Halogens

40
Q

What are group 0 elements on the periodic table known as?

A

Noble gases

41
Q

Group 7 and 0- As you go down the group what happens to the melting point, boiling point and density.

A

They all increase

42
Q

Group 7- What happens to the colour?

A

It gets darker

43
Q

Group 7- What order do they go in, state wise?

A

gas, liquid, solid.

44
Q

What does diatomic mean?

A

where atoms are lonely and pair up

45
Q

Group 7- toxic or non-toxic

non-metallic or metallic

A

toxic- they can kill cells

non- metallic

46
Q

Group 7- Are they good heat and electricity conductors

A

No

47
Q

During a displacement ____ an element will replace a ____ reactive element in a ________. ______ also do this.

A

reaction
less
compound
Metals

48
Q

Group 7- Reactivity increases/ decreases down/ up the group. Reactions become more/ less vigorous

A

decreases
down
less

49
Q

Group 7- Sodium bromide + chlorine –> ?
Potassium iodide + Fluorine –> ?
Lithium bromide + iodine –> ?

A

Sodium chloride + bromine
Potassium fluoride + iodine
Lithium bromide + iodine

50
Q

Group 0- Don’t / do anything

A

Don’t

51
Q

What does inert mean?

A

unreactive

52
Q

Group 0- Do they pair up- monatomic

A

No therefore, they are not molecules

53
Q

Group 0- As you go down the group the elements get slightly/ very reactive. ______ and ____ don’t react at all.

A

Slightly
Helium
Neon

54
Q

Group 0- The smaller the _______ the more they _____.

A

density

float

55
Q

What is a mixture?

A

A mixtures is a substance that is made up of two or more elements not joined together

Year 8- Science (8 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions