Name…………………….
Group….…………..
Quiz (1) M3
Model (A)
Question 1: Write the scientific term
1. Chemical reactions in which two or more substances combine to form a new compound.
2. Water with percentage of calcium and magnesium salts
3. A chemical process which ion or atom loses one electron or more
4. The gas produced by the thermal decomposition of calcium carbonate.
Question 2: Choose the correct answer
1. Sodium reacts with water to form a/an:
(a) Alkaline solution
(b) Acidic solution
(c) Salt
(d) Oxide
2. When magnesium is added to a solution of one of the copper salts, a __________ precipitate is formed.
(a) Black
(b) White
(c) Red
(d) Blue
Question 3: Write balanced chemical equations and its type
1- Zinc react with copper sulphate
……………………………………………………………………………………………………………………..
2- The oxidation half reaction of magnesium///
……………………………………………………………………………………………………………………..
Question 4: Give a reason
1. Gold does not react with dilute acids.
2. Oxidation and reduction are two concurrent process.
3. Silver lose it’s shine over time.
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Question 5: What happens?
1. A strip of magnesium is brought close to flame.
2. Adding drops of hydrochloric acid to sodium chloride containing universal indicator
Question 6: Complete the following:
1. Cu 2+ + 2e-
Cu represents ……………………………. reaction
2. 3 Fe(s) + …………………… ⟶ Fe₃O₄(s)
3. When silver nitrate react with sodium chloride ……………………… is formed as white precipitate
4. …………………… gas ignites with pop sound.
Question 7: Answer the following:
From the opposite figure:
- Write the equation of the reaction occurred in the tube and state the type of reaction
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