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Science > Cells > Flashcards

Cells Flashcards

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1
Q

In a ………. each atom of an element is always joined to a fixed number of atoms.
John Daltons atomic theory

A

Compound

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2
Q

Everything is made up of tiny particles called ……..

John Daltons atomic theory

A

Atoms

The smallest partial of a chemical element that can exist

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3
Q

Atoms cannot be created or ………

John Daltons atomic theory

A

Destroyed

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4
Q

The atoms in an …….. are identical

John Daltons atomic theory

A

Element
Substance that is only made of one type of atom
Eg hydrogen H2
Oxygen 02

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5
Q

During chemical reactions atoms are rearranged to make …… substances

John Daltons atomic theory

A

New

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6
Q

Oxygen

A

O

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7
Q

Water

A

H2o

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8
Q

Clorine

A

Cl

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9
Q

Lithium

A

LI

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10
Q

Sodium

A

Na

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11
Q

Iron

A

Fe

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12
Q

Bromine

A

Br

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13
Q

Sulfur

A

S

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14
Q

Where do you find the electron

A

Outer shell

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15
Q

Where do you find the neutron

A

Nucleus

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16
Q

Where do you find the proton

A

Nucleus

17
Q

Nitrogen

A

N

18
Q

Carbon

A

C

19
Q

What is a compound

A

Substance that is made of two or more types of atoms that have chemically reacted
The new compound is totally different to the original elements

20
Q

Solid properties ( Also know the diagram)

A 
Cannot flow
Cannot be compressed
Strong bonds
Fixed volume
Dense (lots of particles in a small volume)
Definite shape
21
Q

Liquid properties

A

Can flow easily
Change shape
Cannot be compressed
Medium density (quite a lot of particles in a small volume)
Some forces of attraction between the particles
Particles are close but free to move
Don’t keep a definite shape

22
Q

Gas properties

A 
Easily flow
Move freely 
Can be compressed
Most energy
Very weak forces between the particles 
Don’t keep a definite shape
Low density ( not many particles in a large volume)
23
Q

When two / three or more different elements combine, this is called

A

A compound

24
Q

Naming compounds:
When two different elements combine, the compound ends in ide
Eg sodium + chlorine =
Magnesium + oxygen =

A

Sodium chloride

Magnesium oxide

25
Q

Naming compounds:
When three or more different elements combine and one is oxygen, the ending is something- ate
Copper + sulphur + oxygen =

A

Copper sulphate

26
Q

Structure of compounds-

A

See diagram
Small group of atoms - called molecules
Lattice structure - billions of atoms joined together

27
Q

When does a solid change into a liquid

A

At its melting point

Remember- the melting point is the SAME as it’s freezing point.

28
Q

If a substances boiling point is higher than 50 degrees C and its melting point is lower than 20 degrees C, when is it a liquid?

A

25 degrees C

29
Q

What are the properties of metals?

A

Good conductors of electricity
Malleable
Flexible
High melting point

30
Q

What are the properties of non metals

A

Poor conductors of heat and electricity

Found on the right side of the periodic table

31
Q

What forms acidic oxides

A

Non metals

32
Q

What forms alkaline oxides

A

Metals

Found on the left side of the periodic table

33
Q

What is a molecule

A

A group of a set of atoms joined together

34
Q

What gas is needed for elements to burn

A

Oxygen

35
Q

When you burn an element in air/ oxygen, what is formed

A

Oxide
eg calcium oxide
Carbon dioxide

Science (9 decks)

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