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WorksheetsChemistry 9 Gen - Term 3 Review
Total questions: 15
Worksheet time: 18mins
In Stoichiometry, the ratio of moles is equal with the ratio of ...
volumes
coefficients
masses
concentrations
Which statement is correct about Stoichiometry?
Ratio of moles is the same with ratio of volumes.
At the same pressure and temperature, gases with the same coefficients will have equal volume.
The moles of all substances in the same chemical reaction are always the same.
Ratio of moles is the same with ratio of masses.
4 Li + O2 → 2Li2O
The ratio of moles between Li and O2 is ...
2 : 1
1 : 2
1 : 4
4 : 1
Use the information below to answer questions No. 4, 5 and 6.
150 cm3 of hydrochloric acid 0.2 mol/dm3 is used to neutralise 200 cm3 of magnesium hydroxide as shown in the reaction below.
Mg(OH)2(aq) + 2 HCl(aq) → MgCl2(aq) + 2 H2O(l).
What is the moles of hydrochloric acid?
0.0300 moles
0.750 moles
30.0 moles
750. moles
Use the information below to answer questions No. 4, 5 and 6.
150 cm3 of hydrochloric acid 0.2 mol/dm3 is used to neutralise 200 cm3 of magnesium hydroxide as shown in the reaction below.
Mg(OH)2(aq) + 2 HCl(aq) → MgCl2(aq) + 2 H2O(l).
What is the mole ratio between hydrochloric acid and magnesium hydroxide?
2 : 1
1 : 2
1 : 1
2 : 2
Use the information below to answer questions No. 4, 5 and 6.
150 cm3 of hydrochloric acid 0.2 mol/dm3 is used to neutralise 200 cm3 of magnesium hydroxide as shown in the reaction below.
Mg(OH)2(aq) + 2 HCl(aq) → MgCl2(aq) + 2 H2O(l).
What is the concentration of magnesium hydroxide solution?
0.100 mol / dm3
0.150 mol / dm3
0.0750 mol / dm3
0.0250 mol / dm3
Fe2O3(s) → Fe(s) + O2(g) [NOT BALANCED]
What is the mass of iron produced when 20 g of iron(III) oxide is decomposed?
[Ar Fe = 56 ; O = 16]
(a)
In titration, solution with unknown concentration in the conical flask is called ...
Titrant
Analyte
Burette
End point
Which are the main chemical(s) that should be present in titration?
You can choose more than one answer.
Titrant
Analyte
pH indicator
Sodium hydroxide
To keep the accuracy of our experiment, we need to redo the titration at least ... times.
(a)
Which titres should we choose to be included in our calculation?
Your answer can be more than one.
25.20 cm3
25.00 cm3
24.80 cm3
27.20 cm3
In which part that our left hand should hold into (for right hand user) during the titration?
A
B
C
None of the answers is correct
Sodium hydroxide 0.5 mol / dm3 is put in the burette and 20 cm3 of sulfuric acid is placed in the conical flask with methyl orange indicator. Which statement is correct about this experiment?
Methyl orange = acidic (red) & alkaline (yellow)
Sodium hydroxide is the analyte.
Sulfuric acid is the titrant.
The end point is reached when the colour turns from red into orange.
The end point is reached when the colour turns from yellow into orange.
What is the correct average titres value from these data experiment?
#1 = 20.80 cm3
#2 = 20.90 cm3
#3 = 25.80 cm3
20.80 cm3
20.85 cm3
22.50 cm3
25.80 cm3
25 cm3 of hydrochloric acid is put in the conical flask. Potassium hydroxide is contained in the burette with concentration of 0.4 mol dm-3. The titre values are 14.90 cm3, 15.00 cm3 and 15.10 cm3. Determine the concentration of the acid.
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