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GCSE Chemistry Quiz on Additional Chemistry - Topic 3: Covalent Compounds and Separation Techniques, created by Hollieee01 on 15/04/2014.

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Additional Chemistry - Topic 3: Covalent Compounds and Separation Techniques

Question 1 of 16

1

What atoms do covalent bonds occur between?

Select one of the following:

  • Non-metal atoms

  • Metal atoms

  • Metal and non-metal atoms

Explanation

Question 2 of 16

1

A single covalent bond is formed when two atoms share one pair of electrons

Select one of the following:

  • True
  • False

Explanation

Question 3 of 16

1

How many electrons are shared when a double bond is formed?

Select one of the following:

  • 2 electrons

  • Two pairs

  • 1 pair

  • 12 electrons

Explanation

Question 4 of 16

1

What is each atom aiming to do when sharing it's electrons?

Select one of the following:

  • Get a full outer shell

  • Lose all of its neutrons

  • Give away all of it's electrons to other elements

  • Share with all it's friends to make the world a happier place

Explanation

Question 5 of 16

1

What are the properties of a simple covalent molecule? (2)

Select one or more of the following:

  • Weak forces between the molecules

  • Strong covalent bonds between atoms

  • Weak covalent bonds between atoms

  • Strong forces between the molecules

Explanation

Question 6 of 16

1

Simple covalent molecules have high melting and boiling points and can conduct electricity

Select one of the following:

  • True
  • False

Explanation

Question 7 of 16

1

What makes the giant molecule different to a simple molecule?

Select one or more of the following:

  • Many of the atoms in a giant molecule are joined together covalently throughout the whole giant molecule structure

  • There are more electrons in the atoms of the giant molecules which makes them negatively charged and able to conduct electricity

  • Giant molecules have high boiling and melting points, simple molecules have low ones

  • A simple molecule is made by breaking the atoms apart, a giant molecule is made by connecting atoms together manually

Explanation

Question 8 of 16

1

Graphite is used to make

Select one of the following:

  • Cars and airplanes

  • Electrodes and lubricants

  • Roofs of houses and flooring

  • Soles of shoes and hair clips

Explanation

Question 9 of 16

1

Does graphite have weak forces of attraction between its layers or strong?

Select one of the following:

  • Strong?

  • Weak?

Explanation

Question 10 of 16

1

What methods can you use to test different compounds?

Select one or more of the following:

  • Melting them using a bunsen burner

  • Placing electrodes into a sample of the substance to see if it conducts electricity as a solid, liquid or aqueous solution

  • Timing how long it takes the substance to dissolve in water

Explanation

Question 11 of 16

1

What is the definition of immiscible?

Select one of the following:

  • When two liquids are mixed together and form distinct separate layers

  • When liquids are mixed together and stay mixed together

  • When liquids turn to carbon dioxide when placed together

  • When liquids turn to a gas when they have been placed in a freezer

Explanation

Question 12 of 16

1

Miscible is when liquids are mixed together and they stay mixed together

Select one of the following:

  • True
  • False

Explanation

Question 13 of 16

1

How would you separate miscible liquids?

Select one of the following:

  • By using distillation or fractional distillation

  • By shaking them around

  • By using a separating tunnel

  • By placing them in a water bath

Explanation

Question 14 of 16

1

Once oxygen has been separated from liquid air by fractional distillation what can we use it for?

Select one of the following:

  • Steel-making

  • To help young children breath better

  • To help freeze food quickly

  • To put back into the air

Explanation

Question 15 of 16

1

What is chromatography used for?

Select one or more of the following:

  • To separate dissolved dyes used in food colourings

  • To check foods for additives, contaminants and other substances

  • To separate traces of chemicals in fires

  • To identify drugs

  • To test our blood pressure

  • To test for animal faeces

Explanation

Question 16 of 16

1

How do we work out the Rf value of a substance?

Select one of the following:

  • Distance moved by soluble substance / Distance moved by solvent

  • Distance moved by solvent / Distance moved by soluble substance

  • Distance moved by soluble substance x Distance moved by solvent

  • Distance moved by soluble substance + Distance moved by solvent

Explanation

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