Question

1. A group of student s wanted to prepare a sample of crystal from this following reaction: sodium + water → A + hydrogen; A + hydrochloric acid → B + water

(a) What is the chemical name of A?

(b) What is the chemical name of B?

(c) Salt is divided into acidic salt, basic salt and neutral salt. What kind of salt is produced by the second reaction?

2. A chemical element with atomic number 20 and mass number 40.078 amu. It is a reactive metal which is located in alkaline earth metal group.

(a) What is the chemical name of the element?

(b) Write a word equation for the reaction of this reactive metal with water.

(c) Write a word equation for the reaction of this reactive metal in carbonates with hydroiodic acid.

3. There're 3 unknown compounds (A, B and C) give lilac, blue-green and crimson red colour respectively.

(a) What metal is in each compounds (A, B and C)?

(b) Which metal (in part a) does not react with water? Explain your answer.

4. A salt is obtained from reaction between metal and acid solution. The metal that used in this reaction is silver and the acid solution is carbonic acid.

(a) What is the chemical name of salt above?

(b) Explain the separation method that used to get dry powder of the salt above.

(c) Write a word equation for this reaction.

pls help I'm not good at chemistry ​

Answer 1

Answer:

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