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Science > Chem A > Flashcards

Chem A Flashcards

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1
Q

What are the 3 subatomic particles

A

Protons, neutrons, electrons

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2
Q

What is an isotope?

A

Atoms of the same element but with a different number of neutrons

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3
Q

What is a compound?

A

Two or more different elements chemically bonded together

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4
Q

Who discovered electrons orbiting the nucleus in shells

A

Neils Bohr

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5
Q

Who made the plum pudding model

A

J.J. Thomson

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6
Q

How would you separate a mixture of sand and water?

A

Filtration

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7
Q

How would you separate a mixture of water and oil

A

Distillation

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8
Q

How would you separate a mixture of salt water and mud

A

Filtration then crystallization

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9
Q

Who made the framework for the modern day periodic table

A

Dimitri Mendeleev

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10
Q

What is a molecule

A

Two or more elements bonded together

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11
Q

How many electrons does each shell hold respectively

A

2 electrons, 8 electrons, 8 electrons

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12
Q

What is the nucleus of an atom made up of

A

Protons and neutrons

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13
Q

What does the atomic number represent

A

The number of protons which is equal to the number of electrons

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14
Q

What does the mass number represent

A

The number of protons + neutrons

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15
Q

How would you find the amount of neutrons in an atom of an element

A

Mass number - atomic number

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16
Q

Why dont the protons in the nucleus repel eachother and separate from the nucleus

A

Because of the neutrons in between the protons holding them together

17
Q

What are group 1 elements called

A

Alkali metals

18
Q

What are group 7 elements called

A

Halogens

19
Q

What are group 0 elements called

A

Noble gases

20
Q

What is the rate of reaction in group 1 (alkali) metals

A

Increases as you go down the group, outer electron if further away, more shells (shielding) therefore weaker attraction of nucleus to outer electrons

21
Q

What is the rate of reactivity pattern in group 7 (halogens) elements

A

Decreases down the group

22
Q

What is the reactivity of group 0 (noble gases) elements

A

They are unreactive

23
Q

What is relative atomic mass

A

The average mass of one atom of an element to 1/12 of the mass of an atom of carbon-12

24
Q

What is relative isotopic mass

A

The average mass of all isotopes

25
Q

What determines the reactivity of an element

A

The number of electrons in the outer shell

26
Q

What is the formula for relative atomic mass (RAM)

A

(% abundance of isotope 1 x mass) + (% abundance of isotope 2 x mass) all divided by 100

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