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bghs > science > Flashcards

science Flashcards

1
Q

what is chemistry

A

chemistry is the study of matter, its structure and how it changes

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2
Q

what is matter

A

everything is made up of matter, matter is up of microscopic particles called atoms

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3
Q

what are the pure substances

A

compound and elements

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4
Q

impure substances?

A

mixture

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5
Q

element?

A

an element is a pure substance made up of only one type of atom

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6
Q

compound?

A

a compound is a pure substance made up of two or more different types of atoms and are always chemically joined together.

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7
Q

what are differences between elements and compounds?

A

elements cant be broken down into something similar and compounds can be broken down into something simpler

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8
Q

mixture?

A

a mixture is an impure substance that is made up of more than an atom or molecule which is not chemically joined.

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9
Q

all matter is made up of…

A

atoms

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10
Q

atoms are tiny little….

A

particles

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11
Q

……are made up of similar atoms

A

elements

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12
Q

all atoms of the same elements are

A

exactly the same

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13
Q

what is the difference between compounds and mixtures

A

compounds is a pure substance and is chemically joined together and a mixture is an impure substances and isn’t chemically joined together

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14
Q

what is the difference between compounds and mixtures

A

compounds is a pure substance and is chemically joined together and a mixture is an impure substances and isn’t chemically joined together

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15
Q

what does a chemical symbol represent

A

it represents a chemical element

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16
Q

what does the atomic number stands for

A

the number of protons that the atom contains

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17
Q

atomic mass meaning

A

the number of protons and neutrons that the atom contains

18
Q

in an atom, what proton, neutron or electron are the same

A

protons and electrons

19
Q

how to work out the number of neutrons in an atomic

A

you will need to subtract the atomic number from the atomic mass.

20
Q

how to find most stuff if they are elements compounds or mixtures

A

elements(C) or (B)
compounds (N2O) or (BE3)
mixtures (nothing)

21
Q

what are some things that are not substances

A

electricity
energy

22
Q

malleable meaning?

A

able to be hammered or pressed into shape without breaking or cracking.

23
Q

ductile meaning

A

can be stretched into a wire

24
Q

brittle

A

it can break easily

25
Q

properties of metal

A

shiny, solid, conducts electricity and heat, is malleable and ductile

26
Q

properties of non-metal

A

dull(not shiny), a bit are solid, most are gases, and one is liquid, does not conduct electricity, brittle, not malleable or ductile.

27
Q

properties of a metalloid

A

has some properties of metals and non-metals.

28
Q

independent variable

A

the variable being tested

29
Q

dependent variable

A

the variable being measured

30
Q

controlled variable

A

the variable that doesn’t change

31
Q

what are two difference between a physical and chemical change

A

a physical change is where no new substances are made it can be reversed, a chemical change is when new substances are made and substances react and cant be reversed.

32
Q

example of a chemical change

A

when a paper is burning

33
Q

example of a physical change

A

when an ice cube melt

34
Q

name everyday chemical reactions

A

photosynthesis, rusting and chopping an onion

35
Q

list evidence a chemical reaction has occurred

A

gas bubbles, colour change and temperature change

36
Q

polymer meaning

A

polymers are long molecules made up of many smaller identical molecules (monomers).

37
Q

What is the difference between procedure and procedural recount?

A

A procedure details the steps or instructions to do or make something. Procedural recounts record steps involved in an investigation, usually in science.

38
Q

3 common compounds and their chemical formula

A

carbon dioxide- CO2 carbon monoxide CO water H2O

39
Q

properties of plastic

A

cheap,light,long lasting

40
Q

an example of a polymer and the monomer it is made up of

A

polyester made up of ester

41
Q

Which technology allows scientists to analyse atoms?

A

Electron microscope

bghs (18 decks)

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