Physical Abd Chemical Changes Flashcards

1
Q

Chemical property

A

A substances ability to react with other substances to form new products

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2
Q

Chemical change

A

A change in nature of the starting materials undergoing a chemical reaction to produce one or more new substances difficult to reverse

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3
Q

Reactant

A

Starting materials is chemical reaction

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4
Q

Product

A

stuff that is made in chemical reaction

Reactant -> product ( which can be more than 1

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5
Q

5 signs of chemical reaction

A
Temperature change 
Colour change 
Odour produced 
Solid produced precipitate 
Gas or bubbles 
New substance formed
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6
Q

First elements were proposed by

A

Alchemists ( Europe)

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7
Q

First elements were

A

Air fire water earth

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8
Q

What was the alchemists purpose

A

To change metal / lead to gold

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9
Q

What is matter made of

A

Atoms

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10
Q

What are elements made of

A

Atoms

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11
Q

Atomic theory

A

All matter is made of small particles called atoms atoms can’t be created or destroyed or minimized same element same mass all element atoms mass differ compounds are created when atoms of different atoms link together in definite proportions

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12
Q

JJ Thomson

A

Discovered electrons and used a cathode to discover them used the plum pudding model

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13
Q

Ernest Ruth ford

A

Discovered protons used gold foil experiment to discover proton proposed nuclear model

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14
Q

Ruth fords conclusion I

A

The atom is mostly empty space with a solid positive center called a nucleus

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15
Q

Niels Bohr

A

Proposed electrons occupied energy levels called shells or orbitals

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16
Q

What is an atom made up of

A

Subatomic particles

17
Q

How many subatomic particles are there

Name them

A

3

Protons neutrons electrons

18
Q

Protons

A

Symbol - p
Mass- 1 electric charge (+)

Location - nucleus

19
Q

Neutrons

A

Symbol-n
Mass- slightly more than 1
Electric charge - o
Location- nucleus

20
Q

Electrons

A

Symbol- e
Mass - so small almost 0
Electric charge (-)
Location- in shells around nucleus

21
Q

Kinetic energy

A

energy that a body possesses by virtue of being in motion