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Chemistry+physics > Cp > Flashcards

Cp Flashcards

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1
Q

What is a pure substance

A

A substance that consists of only one element or compound

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2
Q

What is a mixture

A

A mixture consists of two or more substances that are not chemically joined together

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3
Q

What happens when a mixture is heated in simple distillation

A

The solvent evaporates and leaves the solution

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4
Q

What method is used to obtain pure water from salt solution

A

Simple distillation is used to obtain or pure water

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5
Q

In chromatography what is a mobile phase

A

The solvent that moves through the paper

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6
Q

What substance can be separated from its mixture with water by fractional distillation

A

Ethanol

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7
Q

What is a compound

A

A substance made up of two or more elements that are chemically combined

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8
Q

What’s the plum pudding model

A

An atom is a ball of positive charged with negative electrons in embedded in it

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9
Q

What’s the typical radius of an atom

A

One times 10 to the power of 10 m

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10
Q

What is the relative mass and charge of a neutron

A

Mass one and charge Zero

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11
Q

What are isotopes

A

Atoms of the same element with different numbers of neutrons

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12
Q

What is relative atomic mass of an element

A

The average mass of the atoms of an element compared to 1/12 of the mass of a carbon -12 atom

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13
Q

Why is loft insulation so effective

A

Because it traps air trapped air is a very good insulator

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14
Q

What is the best material to wrap around a mug to keep the drink water as long as possible

A

Bubble wrap

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15
Q

What happens to the molecules in a liquid as it gets hotter

A

They will speed up

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16
Q

What happens to the molecules in a solid as it gets hotter

A

They vibrate faster

17
Q

How do metal atoms form ions

A

They lose electrons to form positive ions

18
Q

What does negative ions have

A

More electrons than protons

19
Q

What forces hold an ionic lattice together

A

Electrostatic forces

20
Q

What properties does an ionic compound have

A

High melting point and it conducts electricity when liquid

21
Q

What is a covalent bond

A

A bond formed when two atoms share pairs of electrons

22
Q

What is the greatest number of covalent bonds that are carbon atom can form

A

For

23
Q

How many electrons can share in a double bond

A

Four electrons

24
Q

When a substance made of small molecules boils what does the energy overcome

A

It overcomes inter-molecular forces. The strong con spent bonds are not broken

25
Q

Why do substances made of small molecules not conduct electricity

A

Because they have no charge particles that are free to move from place to place

26
Q

What is a triple bond

A

Three pairs of electrons are shared between two atoms

27
Q

What substance has a giant Covalent structure

A

Silicone dioxide

28
Q

What type of bond joins the atoms together in a Polymer molecule

A

Covalent bonds

29
Q

Why does diamond have a high melting

A

Because of the large amounts of energy that is needed to break it strong covalent bonds

30
Q

How are particles bonded together in metals

A

Attractive forces between atoms and delocalised electrons

31
Q

Why are electrons in the outer shell of metal atoms free to move through the whole structure

A

They are delocalised electrons

32
Q

Which part of metal is most important in transferring thermal energy

A

Delocalised electrons

33
Q

How are atoms arranged in metals

A

Layers

34
Q

How do metals have high melting points

A

They have strong metallic bonds

35
Q

Why can metals be bent and shaped

A

The atoms are arranged in layers which slide over each other

36
Q

What is the main energy transfer for an apple falling from a tree

A

Gravitational potential to kinetic energy

37
Q

What is the main energy transfer for long distance runner

A

Chemical energy into kinetic energy

38
Q

What happens to dissipated energy

A

It’s lost in the surroundings

Chemistry+physics (1 decks)

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