I compiled some questions from assessment books and a few good schools in Singapore.
Here are some of “warm-up” questions on this topic.
As usual, those students who receive my mobile msg to attempt this week’s questions,
here you go! 🙂
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1) A student wrote “Bronze is a compound.”
Explain why this statement is incorrect. [Anglo-Chinese School]
2)Iron sulphide is formed from iron and sulphur. Which of the following statements about iron sulphide is true? [Anglo-Chinese School]
A)Heat energy is required to cause the formation of iron sulphide
B)Iron sulphide has similar properties as iron
C)Iron sulphide is the result of a change in state of iron and sulphur
D)The ratio of iron to sulphur is not fixed in a sample of iron sulphide.
3) Which 2 of the following boxes consist of only 1 element?
[St Margaret Secondary School]
A)I and II
B)I and III
C)II and III
D)II and IV
4) Which of the following has the same number of atoms as Ca(OH)2?
[St Margaret Secondary School]
A)AlCl3
B)BaSO3
C)K2CO3
D)PbSO4
5) Given that the electronic configuration of nitrogen atom is 2,5.
Which of the following statements is true for the ion of nitrogen?
[St Margaret Secondary School]
Number of Protons | Number of electrons | |
A | 7 | 7 |
B | 7 | 10 |
C | 10 | 7 |
D | 10 | 10 |
6) How many different elements are there in ammonium carbonate (NH4)2CO3? [Temasek Secondary School]
A)2
B)3
C)4
D)5
7) [Preston Assessment book]
a) Classify the following substances into elements, mixtures and compounds: ice, brass, silicon, salt, ink, starch solution, plastic, potassium, protein, glass, carbon, air.
b) Explain why sugar solution is a mixture while sugar is a compound.
8)Please write the formula and names of elements of the compound below. [Anglo-Chinese School]
Compound | Formula of compound | Names of elements found in compound |
Nitric acid | ||
Common Salt |