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22-23-Y8-Science > Chemistry Autumn 2022/23 > Flashcards

Chemistry Autumn 2022/23 Flashcards

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1
Q

1.1 What is the name for a solid turning into a liquid and a liquid turning into a solid?

A

melting and freezing

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2
Q

1.2 What is the name for a liquid turning into a gas and a gas turning into a liquid?

A

boiling and condensing

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3
Q

1.3 What is the name for a solid turning into a gas?

A

sublimation

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4
Q

1.4 How does heating affect the energy of particles?

A

the energy of the particles increases

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5
Q

1.5 What happens if particles in a solid have enough energy to overcome the forces holding them together?

A

the particles begin to flow and the solid melts

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6
Q

1.6 Define “boiling point”

A

the temperature at which a liquid turns into a gas

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7
Q

1.7 Define “diffusion”

A

the movement of particles from a high concentration to a low concentration

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8
Q

1.8 Define pressure

A

the force pushing on a particular area

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9
Q

1.9 What is the formula to calculate pressure?

A

pressure = force ¸ area

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10
Q

1.1 What is the formula to calculate density?

A

density = mass ¸ volume

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11
Q

2.1 What is a scientific theory?

A

an idea used to explain events

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12
Q

2.2 How are theories proved or disproved?

A

by collecting evidence

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13
Q

2.3 Define a formulation

A

a mixture designed as a useful product

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14
Q

2.4 Give 2 examples of formulations

A

formula milk and paint

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15
Q

2.5 Define “composite”

A

a material made from two or more different types of material

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16
Q

2.6 Give two examples of composites

A

MDF and fibreglass

17
Q

2.7 What is a polymer?

A

a very large molecule made from smaller molecules called monomers which are joined together

18
Q

2.8 Give 3 examples of polymers

A

polyester, polyethene and polystyrene

19
Q

2.9 Other than separating mixtures give another use of chromatography

A

identifying unknowns

20
Q

2.1 What property of the spots do we compare to identify unknowns

A

distance travelled compared to the distance travelled by a known substance

22-23-Y8-Science (3 decks)

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