Reactions Of Metals And Metal Carbonates
- 1.
What is the formula for carbon dioxide?
- A.
C2O
- B.
CO
- C.
CO2
- D.
C2O2
Correct Answer
C. CO2Explanation
The correct answer is CO2 because carbon dioxide is composed of one carbon atom bonded to two oxygen atoms. The chemical formula CO2 represents this composition accurately.Rate this question:
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- 2.
What is the test and positive result for hydrogen gas?
- A.
Universal indicator - red
- B.
Limewater - cloudy
- C.
Litmus paper - blue
- D.
Lit splint - squeaky pop
Correct Answer
D. Lit splint - squeaky popExplanation
A lit splint produces a squeaky pop sound when it comes into contact with hydrogen gas. This is because hydrogen gas is highly flammable and reacts explosively with oxygen in the presence of a flame. The reaction produces water vapor and releases energy, causing the characteristic squeaky pop sound. Therefore, a positive result for hydrogen gas can be determined by observing this reaction with a lit splint.Rate this question:
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- 3.
What is the formula for hydrogen gas?
- A.
H
- B.
H2
- C.
H
- D.
H2
Correct Answer
B. H2Explanation
The correct answer is H2. Hydrogen gas is composed of two hydrogen atoms bonded together, which is represented by the chemical formula H2.Rate this question:
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- 4.
What is the test and positive result for carbon dioxide gas?
- A.
Limewater - cloudy
- B.
Universal indicator - red
- C.
Lit splint - squeaky pop
- D.
Litmus paper - blue
Correct Answer
A. Limewater - cloudyExplanation
When carbon dioxide gas is passed through limewater, it forms a white precipitate of calcium carbonate, making the limewater cloudy. This is a positive result for the presence of carbon dioxide gas.Rate this question:
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- 5.
What is NOT a observation in a chemical reaction?
- A.
Change of colour
- B.
Change of temperature
- C.
Change of odour
- D.
Change of state
- E.
Effervescence (bubbles)
Correct Answer
D. Change of stateExplanation
In a chemical reaction, the change of state is not considered an observation. This is because a change of state, such as from a solid to a liquid or a gas, is a physical change rather than a chemical change. Observations in a chemical reaction typically involve changes in color, temperature, odor, or the formation of bubbles (effervescence), which indicate the release of a gas.Rate this question:
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- 6.
Acid + Metal --> ________ + hydrogen
Correct Answer
salt, SaltExplanation
When an acid reacts with a metal, it produces a salt and hydrogen gas. The salt is formed by the combination of the metal cation from the metal and the anion from the acid. The hydrogen gas is released as a byproduct of the reaction. Therefore, the correct answer is "salt, Salt."Rate this question:
- 7.
Acid + Metal carbonate --> Salt + Water + ________
Correct Answer
carbon dioxide, Carbon Dioxide, Carbon dioxide, carbon DioxideExplanation
When an acid reacts with a metal carbonate, it produces salt, water, and carbon dioxide. In this case, the blank should be filled with "carbon dioxide" or any variation of it, such as "Carbon Dioxide" or "Carbon dioxide" or "carbon Dioxide".Rate this question:
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Jan 23, 2023Quiz Edited by
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Jan 23, 2020Quiz Created by
Connolly.r
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