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what is the charge of a proton?
positive1
1 of 50
true or false? elements contain more than one type of atom?
false
2 of 50
give the formula for carbon dioxide.
CO^2
3 of 50
what is the difference between a compound and a mixture?
a compound is two or more elements chemically bonded together whereas a mixture, the different elements have no bonds
4 of 50
which method of sepiration is useful to separate an insoluble solid from a liquid?
filtration
5 of 50
give the name of a method to separate a soluble solid from a liquid.
simple distilation
6 of 50
which method of distilation would you use to seperate liquids with similar boiling points?
fractional distilation
7 of 50
who descovered that the plumb pudding model was wrong?
rutherford
8 of 50
who first devised an experiment that proved the existance of a nucleus?
rutherford
9 of 50
what is the electronic structure of sodium?
2,8,1
10 of 50
why did mendeleve leave gaps in his periodic table?
for undescovered elements.
11 of 50
how are the group number and number of electrons in outer shell related?
the group number is the ammount of electrons in their outer shell.
12 of 50
what kind of ions do metals form?
positive.
13 of 50
where are non-metals on the periodic table?
right hand side.
14 of 50
state three trends as you go down group 1.
increase in reactivity, lower melting and boiling points, higher relative atomic mass.
15 of 50
state the products of the sodium and water reaction.
hydrogen.
16 of 50
how do boiling points of group 7 change as you go down the group?
higher (melting and boiling)
17 of 50
what is the charge of the ions hallogens form?
negative.
18 of 50
predict weather iodine is displaced by chlorine in a solution of potassium iodide.
yes it is.
19 of 50
what time of ion do elements from group 1 form?
positive
20 of 50
what kind of ions do elements from group 7 make?
negaive.
21 of 50
describe how an ionic bond is formed.
metal loses an electron and non-metal gain one, these are oppositely charged so strongly attracted.
22 of 50
list the main properties of a an ionic compound.
high melting point, high boiling point and many strong bonds between ions.
23 of 50
describe how covalent bonds form.
share pairs of electrons, strong electrostatic forces making covalent bonds very strong.
24 of 50
explain why simple molecular compounds typically havelow melting and boiling points.
weak forces between bonds.
25 of 50
describe the structure of a polymer.
lots of small units linked together using covalent bonds to form a long molecule.
26 of 50
give three examples oof giant covalent structures.
diamond, graphite, silicon dioxide.
27 of 50
explain why graphite can conduct electricity.
it has delocalised electrons.
28 of 50
explain how fullerenes could be used to deliver drugs into the body.
they canbe used to 'cage' other molecules as it forms around molecules and cause them to be trapped.
29 of 50
what is metalic bonding?
delocalised eectrons creating bonds between metals, these arevery strong.
30 of 50
explain why alloys are harder than pure metals.
different sized atoms have been mixed so it destorts the layers of metal atoms, making them harder to slide over each other.
31 of 50
name the three states of matter.
solid, liquid, gas.
32 of 50
what is the state symbol for an aqueous substance?
aq
33 of 50
what is the name of the emperature at which a liquid becomes a gas.
boiling point.
34 of 50
how des the strength of bonds influence the temperature a substance changes state.
the stronger the bonds, the higher the temperature.
35 of 50
how do you calculate the Mr of a substance?
add all the relative atomic mass' together
36 of 50
state the value of avogadros constant.
6.02x10^23
37 of 50
what if the formula for moles?
mass/Mr
38 of 50
what does conservation of mass mean?
no mass is lost or gained during a reaction.
39 of 50
suggest why the mass of a reaction may decrease in a reaction.
it may be exothermic.
40 of 50
what is meant by the term limiting reactant?
if one reactant gets used up before the rest the reaction will stop.
41 of 50
what is concentration?
a meause of how crowded things are.
42 of 50
give the equation for concentration.
mass/volume
43 of 50
what does the pH scale go up from?
1- acidic, 7-neutral, 14-alkaline
44 of 50
what is the genral word equation for the reaction between an acid and a base.
acid+metal oxide = salt + water/ acid +metal hydroxide =salt +water
45 of 50
what is a strong acid?
pH 1 or oven cleaner.
46 of 50
write the balanced equation for the reaction between hydrochloric acid and sodium chloride.
2HCl+Na^2cCO^3 = 2NaCl + H^2O + CO^2
47 of 50
why is zink less reactive than iron? h
higher in the reactivity series.
48 of 50
what is the general word equation of a metal with an acid?
acid+matal = salt+hydrogen
49 of 50
during electrolysis, which electrode are positive ions attacted to?
negative.
50 of 50

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Card 2

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true or false? elements contain more than one type of atom?

Back

false

Card 3

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give the formula for carbon dioxide.

Back

Preview of the front of card 3

Card 4

Front

what is the difference between a compound and a mixture?

Back

Preview of the front of card 4

Card 5

Front

which method of sepiration is useful to separate an insoluble solid from a liquid?

Back

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