Chem questions

2009-12-14 12:27 am
For questions 1 and 2, decide whether each of the two statements is tre or false; both are tre then decide whether or not the second statement is a correct explanation of the first statement. Then select one option from A to D according to the following table:

A. Both statements are true and the 2nd statement is a correct explanation of the 1st statement

B. Both statements are true but the 2nd statement is NOT a correct explanation of the 1st statement

C. The 1st statement is false while the 2nd statement is true.

D. Both statements are false.

Q1.

1st statement:
1 mole of aluminium atoms can form 3 moles of aluminium ions.

2nd statement:
An aluminium atom loses three electrons to form an aluminium ion.


Q2:

1st statement:
When a mixture of iron(III) oxide powder and aluminium powder is ignited, iron and aluminium oxide form.

2nd statement:
Aluminium is more corrosion resistant than iron.

Explain your answers.
更新1:

For Q1, ans is C For Q2, ans is B Explain the answers

更新2:

What is thermite reaction? Is it form 4 syallabus?

更新3:

HEY, NO DEAD AIR PLZ

回答 (1)

2009-12-14 3:41 am
✔ 最佳答案
Q1.
Al --> Al3+ +3e-
1 mole of aluminium atoms can form 1 moles of aluminium ions only
An aluminium atom loses three electrons to form an aluminium ion is true
so it is C
Q2.
When a mixture of iron(III) oxide powder and aluminium powder is ignited, iron and aluminium oxide form.Thermite reaction, that's true
Aluminium is more corrosion resistant than iron.that's true also
But no the explanation, so it is B
參考: me


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