What numbers will balance the following equation?
_Fe (s) + _O2 (g) → _Fe2O3 (g)
2,3,4
4,3,2
2,3,1
1,2,3
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What numbers will balance the following equation?
_Fe (s) + _O2 (g) → _Fe2O3 (g)
2,3,4
4,3,2
2,3,1
1,2,3
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A company produces tin from an ore called cassiterite, which is mainly tin oxide.
What is the relative formula mass (Mr) of tin oxide, SnO2?
Relative atomic masses (Ar): Sn= 119 O= 16
135
151
270
1904
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The company calculates that the ore cassiterite contains 79% tin oxide, SnO2.
How much tin oxide can be extracted from 1.2 kg of cassiterite?
0.948 kg
1.51 kg
65.8 kg
948 kg
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A piece of iron wool is left in moist air and goes rusty.
Which graph shows how the mass of the iron wool changes?
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What is the reading and uncertainty on this 50 ml measuring cylinder?
23 ±1 ml
26 ± 1 ml
26 ± 2 ml
26 ± 4 ml
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