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science > Elements, Mixtures and Compunds > Flashcards

Elements, Mixtures and Compunds Flashcards

1
Q

Single atoms:

A

Atoms that do not join up with other atoms.

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2
Q

Molecules of an element:

A

When atoms of the same element join together to get a molecule from that element

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3
Q

Compunds:

A

A compound is made when different atoms join together by chemical bonds.

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4
Q

Mixture:

A

A mixture is made from a substance that are not chemically joined.

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5
Q

Define the periodic table:

A

A chart of elements.
The rows are called period.
The colomns are called groups.

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6
Q

Molecules:

A

2 or more atoms connected by chemical bonds.

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7
Q

What type of bond does a molecule have?

A

Ionic

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8
Q

What type of bond does a compund have?

A

Metallic or ionic

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9
Q

Examples of molecules:

A

Hydrogen
Chlorine
Nitrogen

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10
Q

Examples of compund:

A

Carbon dioxide
Water
Sodium chloride

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11
Q

What is a chemical change?

A

A chemical change is irreversible.

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12
Q

What is a physical change?

A

It is a temporary change.

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13
Q

What is the chemical change for sodium hydroxide?

A

NaOH

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14
Q

What is the chemical change for sodium chloride?

A

NaCl

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15
Q

What is the chemical change for nitrogen?

A

N2

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16
Q

What is the chemical change for oxygen?

A

O2

17
Q

What is the chemical change for chlorine?

A

Cl2

18
Q

What is the chemical change for hydrogen chloride?

A

HCl

19
Q

Iron + oxygen = ?

A

Iron oxide

20
Q

Magnessium + chlorine = ?

A

Magnessium chloride

21
Q

Purity:

A

Purity is a way to describe how much of specific element is in a mixture.

22
Q

Alloy:

A

Alloy is a mixture of elements of which at least one is a metal.

23
Q

Concentration:

A

The proportion of solute to solvent.

24
Q

What is diffusion?

A

It is the mixing of particles within a liquid or gas until it has become evenly spread out.

25
Q

Why does diffusion occur?

A

It occurs due to random movement.

26
Q

Where does diffusion occur?

A

Diffusion does not happen in solids but it happens in liquids and gases.

27
Q

Examples of diffusion?

A

Deoderant
Perfume

science (6 decks)

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