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Science > Matter Y7+8. > Flashcards

Matter Y7+8. Flashcards

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1
Q

Displacement

A

The removal of something from its position

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2
Q

Halogen

A

A group 7 non metal element

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3
Q

Compound

A

A pure substance made from two or more elements chemically bonded together e.g salt- NaCl

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4
Q

Monomer

A

A small particle that can polymerise, turn into a polymer.

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5
Q

Mixture

A

Two or more elements or compounds that are in the same place but NOT chemically bonded together. This is why air is a mixture. It is composed of oxygen, argon, nitrogen, carbon dioxide and methane.

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6
Q

Compound

A

A pure substance made from two or more elements chemically bonded together e.g salt- NaCl

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7
Q

Polymer

A

A chain of monomers

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8
Q

Trend

A

An ordered pattern or sequence

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9
Q

Element

A

Something that is made up of only one atom.

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10
Q

Halogen

A

A group 7 non metal element

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11
Q

How does reactivity change as you go down group 1?

A

It increases. As the outer most shell of electrons gets further away from the nucleus, the electrostatic attraction gets weaker, meaning that less energy is required to make a reaction occur.

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12
Q

Mixture

A

Two or more elements or compounds that are in the same place but NOT chemically bonded together. This is why air is a mixture. It is composed of oxygen, argon, nitrogen, carbon dioxide and methane.

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13
Q

Polymer

A

A chain of monomers

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14
Q

Trend

A

An ordered pattern or sequence

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15
Q

Monomer

A

A small particle that can polymerise, turn into a polymer.

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16
Q

Element

A

Something that is made up of only one atom

17
Q

How does reactivity change as you go down group 7?

A

It decreases. Group 7 elements have 7 electrons on their outer shell, so during a reaction, they try and gain an electron in order to get a full valence shell, which is harder than losing an electron, which group 1 elements do.

20
Q

Displacement reaction

A

A chemical reaction in which a more reactive element displaces a less reactive element from its compound

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