Human activity has led to an increase in the amount of carbon in the atmosphere.

Question

Human activity has led to an increase in the amount of carbon in the atmosphere. This has an effect on

Select one:

a. the size of the hole in the ozone layer

b. increase in size of hole in ozone layer and global warming

c. global warming

2. A 50 mg per litre solution is diluted by a factor of 1/5. What is the concentration of the diluted solution?

Select one:

a. 25 mg per litre

b. 10 mg per litre

c. 5 mg per litre

d. 15 mg per litre

3. Choose the statement that is NOT correct.

Select one:

a. Amino acids contain an amine (-NH) and carboxylic acid group (COOH).

b. All thiols contain a sulfur atom.

c. Alcohols always contain a carbonyl group (C=O).

d. All amines contain a nitrogen atom

4. Which of the following statements is correct?

Select one:

a. An alkene is a hydrocarbon with carbon-carbon triple bonds.

b. An alkene is a hydrocarbon with carbon-carbon double bonds.

c. Benzene is an alkene.

d. A saturated hydrocarbon would be an alkene.

5. Which gas law can be used to explain why an open tank of rainwater would become contaminated from a nearby gas leak?

Select one:

a. Boyle's Law

b. Henry's Law

c. Dalton's Law

6. Hydrogen bonds are weak attractions that generally form between

Select one:

a. Hydrogen atoms and any other atom in a different molecule

b. Two hydrogen atoms in different molecules

c. Two hydrogen atoms in the same molecule

d. Hydrogen atoms and oxygen atoms of two different molecules

Explanation / Answer

1) Ans= c - global warming

   Increase in the amount of carbon in the atmosphere leads to global warming.

2)    Ans = b

Dilution always reduces the concentration.

New concentration = 50 mg per litre / 5 = 10 mg per litre

3) Ans = C

    Alcohols always contain -OH functional group.

    -C=O is carbonyl functional group.

4) Ans = b - An alkene is a hydrocarbon with carbon-carbon double bonds.

   Alkyne = carbon-carbon triple bonds

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