Exam code: 5070
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8.2 Group I Properties
Which of the following observations does not apply to Group I elements?
They are relatively soft metals.
They corrode quickly when exposed to air.
They react very quickly with water releasing hydrogen gas
They produce acidic solutions in reaction with water.
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Which statement about the Group I metals lithium, sodium and potassium is correct?
They are harder than iron.
They have higher melting points than iron.
They are soft enough to be cut with a knife.
They are denser than water.
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Lithium, sodium and potassium are each added to a separate sample of cold water.
Which metal reacts most vigorously?
lithium
sodium
potassium
They all react equally vigorously.
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Which of these Group I metals has the lowest melting point?
lithium
potassium
rubidium
caesium
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Lithium, sodium and potassium all float when they are added to water.
What does this show about these three metals?
Their density is lower than the density of water.
Their density is higher than the density of water.
They have low melting points.
They are unreactive.
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Which row correctly describes the trends going down Group I from lithium to caesium?
melting point | reactivity with cold water | |
|---|---|---|
A | increases | increases |
B | increases | decreases |
C | decreases | increases |
D | decreases | decreases |
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Which statement about the Alkali metals is correct?
Potassium is more dense than lithium.
Lithium has a higher density than sodium.
Potassium is less reactive than sodium.
The melting point of sodium is higher than lithium.
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The elements in Group I of the Periodic Table show trends in both their reactivities and their melting points. Rubidium is in Group I.
Which statement about rubidium is correct?
It has a higher melting point than potassium.
It reacts with water to produce an acidic solution.
It reacts with water to produce oxygen gas.
It is more reactive than potassium.
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Francium, Fr, lies below caesium in Group I of the Periodic Table.
Which row most likely describes francium compared with caesium?
melting point | density | reaction with cold water | |
|---|---|---|---|
A | higher | lower | less vigorous |
B | higher | higher | more vigorous |
C | lower | higher | more vigorous |
D | lower | lower | less vigorous |
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The table shows the melting point and the density of four metals.
Which metal is most likely to be in Group I?
melting point / °C | density / g cm-3 | |
|---|---|---|
A | 1083 | 8.96 |
B | 63 | 0.86 |
C | 1538 | 7.87 |
D | 30 | 5.91 |
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Bromine and rubidium react together to form the compound rubidium bromide. Which row correctly describes the formula and colour of rubidium bromide?
| formula | colour |
A | RbBr | dark grey |
B | RbBr2 | dark grey |
C | RbBr | white |
D | RbBr2 | white |
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Three Group I metals, X, Y and Z, are each added to a separate sample of cold water.
X melts into a ball and moves rapidly across the surface of the water.
Y fizzes steadily and does not melt.
Z ignites and the reaction is violent.
What is the order of these three metals in Group I, from the highest position in the group to the lowest position?
X, Y, Z
Y, X, Z
Z, X, Y
Z, Y, X
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The table shows the properties of four alkali metals.
Which one is placed lowest in the group?
melting point / oC | density / g cm-3 | |
A | 39.0 | 1.50 |
B | 28.5 | 1.93 |
C | 98.0 | 0.98 |
D | 63.5 | 0.86 |
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Four statements about Group I metals are shown.
They share similar physical properties because they have the same number of electrons in their outer shell.
Reactivity increases down the group, so potassium reacts more vigorously with water than lithium does.
Transition elements have higher melting points than Group I metals because the metallic bonding in Group I metals is weaker.
Group I metals form soluble acidic oxides which dissolve in water to form solutions with a high pH.
Which statements are correct?
1 and 2
2 and 3
2 and 4
3 and 4
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The table shows the density of four Group I metals.
metal | density / g cm-3 |
|---|---|
lithium | 0.53 |
sodium | 0.97 |
potassium | 0.86 |
rubidium | 1.53 |
Which statement about the density of the Group I metals is correct?
The density increases at every step down the group.
The general trend is an increase in density down the group.
There is no trend in the density.
The general trend is a decrease in density down the group.
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