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The document contains 6 questions about ionic compounds and chemical reactions. Table 1 lists positive and negative ions in 3 ionic compounds. Questions 1-3 ask about identifying ions from the table and writing chemical formulas and equations. Questions 4-5 ask about calculating empirical and molecular formulas from experimental data on reactions of magnesium and ethene. Question 6 asks about determining the relative mass of a compound and number of atoms in a given amount of ammonia gas.

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49 views2 pages

Revision Calculation

The document contains 6 questions about ionic compounds and chemical reactions. Table 1 lists positive and negative ions in 3 ionic compounds. Questions 1-3 ask about identifying ions from the table and writing chemical formulas and equations. Questions 4-5 ask about calculating empirical and molecular formulas from experimental data on reactions of magnesium and ethene. Question 6 asks about determining the relative mass of a compound and number of atoms in a given amount of ammonia gas.

Uploaded by

emy liana
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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REVISION

Question 1
Table 1 shows the positive ions and negative ions in three ionic compounds

Table 1

Use the information given in Table 1 to answer the following questions.

(a) What is another name for a negatively charged ion? [1 mark]


(b) Name all the ions in copper(II) carbonate.[1 mark]
(c) Write the chemical formula for lead(II) nitrate. [1 mark]
(d) When lead(II) nitrate solution is added to excess potassium iodide solution, a yellow precipitate, lead(II) iodide
and a colourless solution is formed.
(i) Write the chemical equation for the reaction. [2 marks]
(ii) State the name of the colourless solution formed. [1 mark]
(iii) Calculate the mass of precipitate formed if 0.05 mol of lead(II) nitrate solution is used. [2 marks]

Question 2

Silver nitrate decomposed when it is strongly heated according to equation below:

2AgNO3 → 2Ag + 2NO2 + O2

(a) Interpret the chemical equation qualitatively and quantitatively [2 marks]


(b) When 1 mol of silver nitrate is heated, calculate the total number of molecules of gases produced. [2 marks]
(c) In an experiment, a student heated 85 g of silver nitrate. Calculate the mass of silver produced at room
condition [3 marks]
Question 3

The heating of magnesium carbonate produces magnesium oxide and carbon dioxide gas. In an experiment, a student
heated 4.2 g of magnesium carbonate.

(a) Write a chemical equation for the decomposition of magnesium carbonate. [1 mark]
(b) Calculate the mass of magnesium oxide produced. [2 marks]

Question 4

In an experiment to determine the empirical formula for magnesium oxide, 1.2 g of magnesium ribbon was heated in a
crucible. After the reaction completed, it was found that 2.0 g of magnesium oxide was produced

(a) What is meant by empirical and molecular formula [2 marks]


(b) Calculate the empirical formula for magnesium oxide. [4 marks]

Question 5

Ethene has a composition of carbon, 85.71 % and hydrogen, 14.29 %.

(a) Calculate the empirical formula of ethene. [4 marks]


(b) The relative molecular mass of ethene is 28. Determine the molecular formula of ethene [2 marks]

Question 6

(a) The diagram above shows the chemical formula of potassium hexacyanoferrate(II)trihydrate. What is the
relative mass of this compound?
(b) What is the number of atoms in 0.5 mol of ammonia gas, NH3?

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