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3R chemistry revision
An isotope has
which elements did Marie Curie discover?
3R chemistry revision
33 terms
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Answers
1
which elements did Marie Curie discover?
zinc & beryllium
uranium & xenon
radium & polonium
radon & radium
2
An isotope has
a coating of zinc
a solute and solvent making a solution
the same number of protons & a different number of neutrons
the same number of neutrons & a different number of protons
3
the nucleus of an atom consists of ...
protons & neutrons
protons, neutrons & electrons
electrons & neutrons
electrons & protons
4
the state of matter of mercury at 20
o
C is
liquid
vapour
gas
solid
5
what term is used to describe the solid produced when two solutions are mixed?
precipitate
saturated
solute
solvent
6
metals conduct electricity because ...
they have electrons that move
they have three electrons
they have molecules that move
they have fixed electrons
7
what do ionic compounds have?
giant molecular structure
regular arrangement of atoms
low melting points
high melting points
8
what is the formula for calcium carbonate?
CaCO
CaC
CaCO2
CaCO3
9
What particles are found in an atom?
electrons
all of these
neutrons
protons
10
chemistry is ...
awesome
none of these
interesting
amazing
11
what is the most reactive element?
iron
zinc
lead
magnesium
12
what is methane (CH
4
)?
a covalent compound
a non-metal element
an ionic compound
a metallic element
13
Balance the equation __NaNO
3
→ __ NaNO
2
+ __O
2
1, 2, 2
2, 2, 2
2, 2, 1
1, 2, 3
14
How many electrons can the first shell hold?
6
4
8
2
15
What si the formula for phosphoric acid?
H2SO4
HCl
H3PO4
HNO3
16
what is the first element in the periodic table?
helium
hydrogen
hidrogen
hydrogin
17
what is a precipitate
rain
molecule
soluble compound
insoluble compound
18
metals have ____ melting points and ________ bonds between atoms
high, strong
high, weak
low, weak
low, strong
19
Put Ca, H, Li & Mg in order of reactivity - the most reactive
FIRST
.
H, Mg, Ca. Li
Mg, H, Ca, Li
Li, Ca, Mg, H
Ca, Li, H, Mg
20
the best metal to safely recover copper from copper sulphate is ...
silver
gold
magnesium
sodium
21
Which is the most reactive metal?
lithium
magnesium
sodium
potassium
22
what is meant by the term oxidation?
all of these
a chemical that reduces oxygen
a chemical gains oxygen
a chemical loses oxygen
23
which is the least reactive metal?
lead
silver
gold
iron
24
what is the formula of calcium hydroxide?
CaHO
CaOH2
Ca(OH)2
CaCl2
25
what is the third commonest gas in the atmosphere?
nitrogen
carbon dioxide
argon
oxygen
26
name the three states of matter
compounds, elements, mixtures
solids, liquids, gases
Texas, New York, Florida
ions, molecules, atoms
27
what is needed for iron to rust?
air and water
carbon dioxide
only water
only air
28
what element has the symbol Ti?
Titanium
Tantalum
Tin
testosterone
29
atoms are neutral because ...
they have equal numbers of atoms
they have equal numbers of electrons and neutrons
they have equal numbers of protons and electrons
they have equal numbers of protons and neutrons
30
What group is calcium in?
group 2
group 4
Group 1
group 7
31
what is H
2
O commonly known as?
all of these
ice
steam
water
32
What is chromatography?
separating a liquid from a solution
spreading colours on paper
separating a solid from a solution
Coating a car with chrome
33
what is an ore?
a mineral that is rich in a particular element
a molecule
a chemical
a compound
