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化學 · 共 135 題 · 點擊選項即時核對答案

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121.

CO₂(g) + CaCO₃(x) + H₂O(y) → Ca(HCO₃)₂(z) In the above chemical equation, which of the following combination is correct?

x	y	z
aq	l	aq
s	aq	s
s	l	s
s	l	aq

122.

For each of the following questions, decide whether each of the two statements is true or false. If both are true, decide whether the second correctly explains the first.

A.Both statements are true and the 2nd statement is a correct explanation of the 1st statement.

B.Both statements are true but the 2nd statement is NOT a correct explanation of the 1st statement.

C.The 1st statement is false but the 2nd statement is true.

D.Both statements are false.

1st statement	2nd statement
Concentrated sulphuric acid can be used to prepare nitric acid.	Sulphuric acid is more volatile than nitric acid.

123.

For each of the following questions, decide whether each of the two statements is true or false. If both are true, decide whether the second correctly explains the first.

A.Both statements are true and the 2nd statement is a correct explanation of the 1st statement.

B.Both statements are true but the 2nd statement is NOT a correct explanation of the 1st statement.

C.The 1st statement is false but the 2nd statement is true.

D.Both statements are false.

1st statement	2nd statement
Sodium carbonate is not decomposed by heat.	Sodium carbonate is an ionic compound.

124.

Consider the following diagram:

Which of the following combinations is correct?

	Reactant X	Reactant Y
	H₂(g)	dilute H₂SO₄
	CO(g)	dilute HNO₃
	NH₃(g)	dilute HCl
	C(s)	concentrated HCl

125.

For each of the following questions, decide whether each of the two statements is true or false. If both are true, decide whether the second correctly explains the first.

A.Both statements are true and the 2nd statement is a correct explanation of the 1st statement.

B.Both statements are true but the 2nd statement is NOT a correct explanation of the 1st statement.

C.The 1st statement is false but the 2nd statement is true.

D.Both statements are false.

1st statement	2nd statement
Polyester is a thermoplastic.	Polyester is formed by condensation polymerization.

126.

For each of the following questions, decide whether each of the two statements is true or false. If both are true, decide whether the second correctly explains the first.

A.Both statements are true and the 2nd statement is a correct explanation of the 1st statement.

B.Both statements are true but the 2nd statement is NOT a correct explanation of the 1st statement.

C.The 1st statement is false but the 2nd statement is true.

D.Both statements are false.

1st statement	2nd statement
In the reaction between calcium carbonate and hydrochloric acid, the reaction rate decreases with time.	The molar concentration of hydrochloric acid decreases as the reaction between calcium carbonate and hydrochloric acid proceeds.

127.

For each of the following questions, decide whether each of the two statements is true or false. If both are true, decide whether the second correctly explains the first.

A.Both statements are true and the 2nd statement is a correct explanation of the 1st statement.

B.Both statements are true but the 2nd statement is NOT a correct explanation of the 1st statement.

C.The 1st statement is false but the 2nd statement is true.

D.Both statements are false.

1st statement	2nd statement
A solution of hydrogen chloride in methylbenzene can turn blue litmus paper red.	Hydrogen chloride dissolves in methylbenzene to form hydrogen ions.

128.

For each of the following questions, decide whether each of the two statements is true or false. If both are true, decide whether the second correctly explains the first.

A.Both statements are true and the 2nd statement is a correct explanation of the 1st statement.

B.Both statements are true but the 2nd statement is NOT a correct explanation of the 1st statement.

C.The 1st statement is false but the 2nd statement is true.

D.Both statements are false.

1st statement	2nd statement
When concentrated sulphuric acid is poured onto a piece of cotton cloth, the piece of cloth becomes charred.	Concentrated sulphuric acid is a strong oxidizing agent.

129.

For each of the following questions, decide whether each of the two statements is true or false. If both are true, decide whether the second correctly explains the first.

A.Both statements are true and the 2nd statement is a correct explanation of the 1st statement.

B.Both statements are true but the 2nd statement is NOT a correct explanation of the 1st statement.

C.The 1st statement is false but the 2nd statement is true.

D.Both statements are false.

1st statement	2nd statement
Distilled water is a poor conductor of electricity.	Distilled water contains an equal number of H⁺(aq) ions and OH⁻(aq) ions.

130.

For each of the following questions, decide whether each of the two statements is true or false. If both are true, decide whether the second correctly explains the first.

A.Both statements are true and the 2nd statement is a correct explanation of the 1st statement.

B.Both statements are true but the 2nd statement is NOT a correct explanation of the 1st statement.

C.The 1st statement is false but the 2nd statement is true.

D.Both statements are false.

1st statement	2nd statement
In the preparation of soap, sodium chloride is added after the reaction between oil and sodium hydroxide has been completed.	Sodium chloride can increase the solubility of soap.