Atoms, Compounds And Mixtures (1) Flashcards

1
Q

All substances are made up of _________

A

Atoms

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2
Q

Where is the nucleus located in the atom

A

In the center

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3
Q

The nucleus contains _________ and _________

A

Protons and neutrons

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4
Q

Almost the whole _________ of the atom is concentrated in the nucleus

A

Mass

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5
Q

Size-wise the nucleus is ________ compared to the rest of the atom

A

Tiny

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6
Q

Electrons move around the nucleus in energy levels called __________

A

Shells

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7
Q

Electrons are ___________ charged

A

Negatively

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8
Q

Electrons are ______ but cover a lot of space

A

Tiny

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9
Q

The size of an electron’s __________ determines the size of the atom

A

Orbit

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10
Q

Electrons have virtually no ___________

A

Mass

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11
Q

Relative mass and charge of a proton

A

1

Positive

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12
Q

Relative mass and charge of a neutron

A

1

Neutral

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13
Q

Relative mass and charge of electrons

A

1/2000

Negative

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14
Q

The relative mass of a proton is 1
The relative mass of a neutron is 1
The relative mass of an _____________ is 1/2000

A

Electron

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15
Q

How is the number of electrons similar to the number of protons

A

It is equal

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16
Q

The _________ on the electrons is the same size as the charge on the protons but _____________

A

Charge

Opposite

17
Q

The number of electrons always equals the number of __________ in a neutral atom

18
Q

What does the mass number tell you

A

Total number of protons and neutrons

19
Q

What does the atomic number tell you

A

The number of protons

20
Q

Atoms of the same element always have the same number of _____________ - so atoms of different elements will have different numbers of _____________

A

Protons

Protons

21
Q

To get to the number of neutrons, just do:

_________ number - ____________ number

A

Mass number - atomic number

22
Q

Which number is the mass number

A

The top one

23
Q

Which number is the atomic number

A

The bottom one

24
Q

Atoms can join together to form ____________

25
Some molecules are made from just one _____________ (E.g H2 or N2) while other are made up of more than one _____________ (e.g H2O or Co2)
Element | Element
26
Molecules are held together by ____________ bonds
Covalent
27
Elements consist of one type of _________ only
Atom
28
Atoms in gases often go around in __________
Pairs
29
A molecule with two atoms in it is called a ____________ molecule
Diatomic
30
What is a compound
A substance that is made of two or more different elements which are chemically joined (bonded) together
31
The properties of a compound are often totally different from the properties of the original ____________. For example, if a mixture of iron and sulphur is heated, they form the compound iron sulphide. However it is not much like iron (not magnetic) nor sulphur (not yellow)
Elements
32
There's no chemical bond between the different parts of a __________. This is opposite to a ____________. The parts can be separated out by physical methods such as ____________
Mixture Compound Distillation
33
A mixture of iron powder and sulphur powder will show the properties of _________ iron and sulphur. (It will be magnetic and yellow)
Both