Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

chemistry > Atoms,elements and compounds Updated > Flashcards

Atoms,elements and compounds Updated Flashcards

You may prefer our related Brainscape-certified flashcards:
Periodic Table flashcards Chemistry 101 flashcards AP® Chemistry flashcards Organic Chemistry 101 flashcards
1
Q

what are all substance made from?

A

atoms

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is the smallest part of an element that can exist?

A

atoms

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is an element?

A

a substance that contains only one type of atom.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

How many different elements are there?

A

about one hundred

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is and is not displayed in the periodic table?

A

What is shown: element

What is not shown: mixtures, compounds etc.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

what are most substances?

A

compounds

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

what is a compound

A

A compound is a substance which is formed by two or more DIFFERENT types of elements which are united chemically in a fixed proportion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

what is a chemical formula?

A

a combination of chemical symbols and numbers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What are chemical formulae used to show?

A
  • the different chemicals in a compound

- how many atoms of each element one molecule of the compound contains

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

what is the only way that compounds can be separated into their elements?

A

chemical reactions or electrolysis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

what are mixtures?

A

two or more elements or compounds which are not chemically combined

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What do the components of the mixture retain?

A

e.g. in a mixture of iron and sulfur, the iron is still magnetic and the sulfur is still yellow

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

mixtures can be separated by _________?

A

physical processes, these are not chemical processes so no new substances are made

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

what is filtration used to do?

A

used to separate soluble solids from insoluble solids e.g. a mixture of salt (soluble) sand (insoluble) by dissolving the salt in water and then filtering the mixture

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is crystallisation used to obtain?

A

soluble solids from a solution, e.g. salt crystals can be obtained from a solution of salty water

step 1.the mixture is gently warmed

step 2.the water evaporates leaving crystals of pure salt.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is simple distillation obtaining?

A

a solvent from a solution

17
Q

what is chromatography used to do?

A

it is used to separate the different soluble, coloured components of a mixture, e.g. the different colours added to a fizzy drink can be separated by chromatography

18
Q

what were atoms though to be in early models?

A

tiny spheres that could not be divided into simpler particles

19
Q

What is the overall charge of the atom?

A

it is neutral

20
Q

What did Thomson think atoms were?

A

a sea of positive charge with tiny negative electrons, this is known as the plum pudding model

21
Q

what is the typical atomic radius?

A

what is the type about 0.1nm or 1x 10^-10

22
Q

Why do atoms not have an overall charge?

A

because they contain an equal number of protons and electrons

23
Q

what do all atoms of a particular element contain?

A

the same number of protons

24
Q

what is the number of protons in an atom actually called?

A

the atomic number

25
Q

what the sum of neutrons and protons?

A

the mass number

26
Q

How is the periodic table arranged?

A

in order of atomic number

27
Q

whats the chemical symbol for Helium?

A

helium, He

28
Q

What’s the chemical symbol for Boron?

A

boron, B

29
Q

What’s the chemical symbol for beryllium?

A

beryllium, Be

30
Q

What’s the chemical symbol for lithium?

A

lithium, Li

31
Q

What’s the chemical symbol for Carbon?

A

carbon, C

32
Q

What’s the chemical symbol for neon?

A

neon, Ne

33
Q

What’s the chemical symbol for sodium?

A

sodium, Na

34
Q

What’s the chemical symbol for magnesium?

A

magnesium, Mg

35
Q

what is a molecule?

A

A molecule is a group of two or more atoms held together by chemical bonds.

36
Q

what is the difference between a molecule and a compound?

A

a molecule has two or more of the same atoms whilst a compound has two or more different atoms

37
Q

which non metls naturally exist as molecules?

A 
iodine, I2
bromine, Br2
chlorine, Cl2
fluorine, F2
oxygen, O2
nitrogen, N2
hydrogen, H2
38
Q

what pneumonic can be used to remember what elements are naturally molecules?

A

IBring Clay For Our New House.

chemistry (35 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions