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WorksheetsIS_Unit9_Unit_exercise_E
Total questions: 17
Worksheet time: 6mins
A1. Both acids and alkalis can conduct electricity when dissolved in water.
True
False
A2. A solution with a higher pH value is more acidic than one with a lower pH value.
True
False
A3. Adding water to an alkali can neutralize the alkali.
True
False
A4. Strong alkalis are much more corrosive than strong acids.
True
False
A5. We should handle concentrated acids and alkalis in a fume cupboard.
True
False
B1. Which of the following is a common property of acids?
They have a slippery feel.
They turn red litmus paper blue.
They have a pH value less than 7.
They react with alkalis to produce a saltand hydrogen.
B2. Which of the following substances has a pH value less than 7?
Distilled water
Rainwater
Limewater
Toothpaste
B3. Answer the following question.
A
B
C
D
B4. Which of the following can be used to find the pH value of a substance?
(1) Litmus paper
(2) Universal indicator
(3) pH meter
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3)
B5. Answer the following question.
A
B
C
D
[E] B6. Answer the following question.
A
B
C
D
B7. Which of the following statements about the procedure for diluting concentrated acids and alkalis is INCORRECT?
Dilute them in a well ventilated area.
Add water rapidly to a large amount of concentrated acids or alkalis.
Wear safety goggles and gloves.
Add concentrated acids or alkalis slowly to a large amount of water.
C1(a). Before the experiment, the student rubs the metals with a sandpaper to
remove the acidic coatings
remove the alkaline coatings
remove the oxide coatings
remove the carbonate coatings
C1(b). What gas is produced if gas bubbles are given out in the experiment?
oxygen
hydrogen
chlorine
carbon dioxide
C1(c). How to test for the gas produced in (b)?
A
B
C
D
[E] C1(d). Write word equations for the reactions between zinc and hydrochloric acid.
zinc + hydrochloric acid ➔ zinc chloride + hydrogen
zinc + hydrochloric acid ➔ zinc chloride + water
zinc + hydrochloric acid ➔ zinc chloride + carbon dioxide
zinc + hydrochloric acid ➔ zinc chloride + water + chlorine
[E] C1(e). Write word equations for the reactions between magnesium and hydrochloric acid.
magnesium+hydrochloric acid ➔ magnesium chloride+hydrogen
magnesium+hydrochloric acid ➔ magnesium chloride+water
magnesium+hydrochloric acid ➔ magnesium chloride+chlorine
magnesium+hydrochloric acid ➔ magnesium chloride+nitrogen
