Exam style questions and answers for Chemistry

Why can carbon nanotubes be used as lubricating material? (2)

Why can graphite conduct electricity? (2)

6 MARK QUESTION: Explain why chlorine (Cl2) is a gas at room temperature, but sodium chloride (NaCl) is a solid at room temperature.
Include a description of the bonding and structure of chlorine and sodium chloride in your answer. (6)

Fill in the gap with either: 'high', 'low' or 'very low':

Diamond has a _____ melting point
(1)

Roughly how many atoms do nanoparticles contain? (1)

Why are mixture of metals harder than pure metals? (2)

Gold and stainless steel are also used for dental braces.

Suggest two factors to consider when choosing which metal to use for dental braces. (2)

What is the minimum amount of energy called that is needed to break bonds between particles. (1)

How do catalysts help speed up the rate of reaction? (2)

Sulfuric acid reacts with metals to produce salts.
Why is potassium not a suitable metal to react with sulfuric acid? (2)

A student reacted zinc metal with sulfuric acid to produce a salt and another product.

Complete the equation for this reaction.

Zn + H2SO4 .............................. + ........................... (2)

The student wanted to increase the rate of the reaction between the zinc and sulfuric acid.

State one way, other than using a catalyst, that the student could increase the rate of the reaction. (1)

What is meant by an endothermic reaction and how is it shown in a thermometer when testing it? (2)

Magnesium oxide contains magnesium ions (Mg2+) and oxide ions (O2–).

Describe, as fully as you can, what happens when magnesium atoms react with oxygen atoms to produce magnesium oxide. (4)

Silicon dioxide has a very high melting point.

Other substances are added to silicon dioxide to make glass. Glass melts at a lower temperature than silicon dioxide.

Suggest why. (1)

Describe the structure of a metallic bond

Why is there now less water vapour in the atmosphere?

Why is there less carbon dioxide in the atmosphere?

If pressure increases in a closed system at dynamic equillibrium, what side is favoured in the reaction? (2)

Why can anhydrous copper sulfate be used as a drying reagent? (2) or 3 idk i made this up recalling from Mr.Hebbs

Write the structural formula for ethyl ethanoate

Write the structural formula for propanol
(2)

How can you reduce the effect of random errors? (2)

How is a systematic error caused? (1)

Explain why diamond is hard. (2)

Explain why graphene is strong. (3)

Pure iron would not be suitable for a replacement hip joint. Suggest why. (1)

Why is iron described as an element? (1)

Stainless steel is harder than pure iron.
Explain why. (2) or (3)

What is meant by a strong acid?