C8 Chemical Analysis

Required

1

A pure substance has to be an element

4.8.1.1

Required

1

A mixture is always an impure substance.

4.8.1.1

Required

1

Impure substances have higher boiling points

4.8.1.1

Required

1

Salt is put on ice to increase the melting point.

4.8.1.1

2

Identify 2 differences between pure and impure substances

4.8.1.1

Required

1

What happens to the melting point of water when impurities are added?

4.8.1.1

Required

1

Many people would say that spring water is pure. Is this a pure substance? Explain your answer.

4.8.1.1

Required

1

A student compared a sample of isooctane with some petrol. The student found that the octane boiled at 99°C while the petrol boiled between 45 and 95°C. Which of these is a pure substance? Explain your answer.

4.8.1.1

Required

1

Explain why salt is placed on roads in winter months?

4.8.1.1

1

4.8.1.1

5.5.A

Required

1

4.8.1.1

Required

1

A green ink contains 85% yellow dye and 15% blue dye.
Determine the simplest whole number ratio of yellow dye : blue dye in the green ink.

Yellow dye : Blue dye =

4.8.1.2

MS1c

Required

1

A fertiliser contains 0.225 g of iron per 3.0 g of fertiliser.

Which calculation gives the percentage of iron in the fertiliser?

Tick one

4.8.1.2

MS1c

Required

1

Formulations have specific amounts of each chemical

4.8.1.2

Required

1

Diesel is a formulation. What is a formulation?

4.8.1.2

1

Simple distillation allows us to separate liquids with different boiling points.

4.8.1.3

0

Use the ruler tool on this chromatogram - you will need this to answer the next questions.

4.8.1.3

1

4.8.1.3

1

4.8.1.3

1

4.8.1.3

MS1a

1

4.8.1.3

MS1a

1

4.8.1.3

MS1a

1

4.8.1.3

MS1a

2

4.8.1.1

4.8.1.3

1

4.8.1.3

MS1a

1

In chromatography, ink is the solvent.

4.8.1.3

1

Why is the start line drawn in pencil rather than pen?

4.8.1.3

1

Chromatography allows us to separate different elements in a compound.

4.8.1.3

1

In chromatography, the dyes are soluble in water.

4.8.1.3

2

4.8.1.3

1

Match the gas test to its positive result

Draggable item		Corresponding Item
Hold a burning splint at the open end of a test tube of the gas		Limewater turns milky (cloudy)
Put Damp litmus paper into the gas		Litmus paper is bleached and turns white
Place a glowing splint in a test tube of the gas

4.8.2.1

4.8.2.2

…

Required

1

This question is about gas tests - sort into Tests and Results

Litmus paper is bleached and turns white
Place a glowing splint in a test tube of the gas
Hold a burning splint at the open end of a test tube of the gas

4.8.2.1

4.8.2.2

…

8

Put the order of Chromatography in order

When the solvent has almost reached the top of the filter paper, remove it from the beaker
Cover the beaker and wait a few minutes
Suspend the filter paper in a beaker so it isn't touching the sides or the bottom
Carefully add the solvent to a level just below the ink spot, taking care not to splash the paper
Place a spot of ink on the pencil line

4.8.1.3

2

4.8.3.1

5

Match the metal hydroxide with its color reaction.

Draggable item		Corresponding Item
Aluminium hydroxide		White precipitate
Copper(II) hydroxide		Blue precipitate
Iron(III) hydroxide		Brown precipitate

4.8.3.2

1

4.8.3.2

1

4.8.3.2

1

4.8.3.2

1

4.8.3.5

3

Draggable item		Corresponding Item

4.8.3.3

4.8.3.4

4.8.3.5

1

4.8.2.3

4.8.3.3

1

4.8.3.4

2

4.8.3.1

4.8.3.7

2

4.8.3.7

1

4.8.3.7

1

4.8.3.7

1

4.8.3.7

C8 Chemical Analysis

A pure substance has to be an element

A mixture is always an impure substance.

Impure substances have higher boiling points

Salt is put on ice to increase the melting point.

Identify 2 differences between pure and impure substances

What happens to the melting point of water when impurities are added?

Many people would say that spring water is pure. Is this a pure substance? Explain your answer.

A student compared a sample of isooctane with some petrol. The student found that the octane boiled at 99°C while the petrol boiled between 45 and 95°C. Which of these is a pure substance? Explain your answer.

Explain why salt is placed on roads in winter months?

A green ink contains 85% yellow dye and 15% blue dye. Determine the simplest whole number ratio of yellow dye : blue dye in the green ink. Yellow dye : Blue dye =

A fertiliser contains 0.225 g of iron per 3.0 g of fertiliser. Which calculation gives the percentage of iron in the fertiliser?Tick one

Formulations have specific amounts of each chemical

Diesel is a formulation. What is a formulation?

Simple distillation allows us to separate liquids with different boiling points.

Use the ruler tool on this chromatogram - you will need this to answer the next questions.

In chromatography, ink is the solvent.

Why is the start line drawn in pencil rather than pen?

Chromatography allows us to separate different elements in a compound.

In chromatography, the dyes are soluble in water.

Match the gas test to its positive result

This question is about gas tests - sort into Tests and Results

Put the order of Chromatography in order

Match the metal hydroxide with its color reaction.

A pure substance has to be an element

A mixture is always an impure substance.

Impure substances have higher boiling points

Salt is put on ice to increase the melting point.

Identify 2 differences between pure and impure substances

What happens to the melting point of water when impurities are added?

Many people would say that spring water is pure. Is this a pure substance? Explain your answer.

A student compared a sample of isooctane with some petrol. The student found that the octane boiled at 99°C while the petrol boiled between 45 and 95°C. Which of these is a pure substance? Explain your answer.

Explain why salt is placed on roads in winter months?

A green ink contains 85% yellow dye and 15% blue dye. Determine the simplest whole number ratio of yellow dye : blue dye in the green ink. Yellow dye : Blue dye =

A fertiliser contains 0.225 g of iron per 3.0 g of fertiliser. Which calculation gives the percentage of iron in the fertiliser?Tick one

Formulations have specific amounts of each chemical

Diesel is a formulation. What is a formulation?

Simple distillation allows us to separate liquids with different boiling points.

Use the ruler tool on this chromatogram - you will need this to answer the next questions.

How many substances are in dye A?

How many substances are in Dye B?

Calculate the Rf value for substance P

Calculate the Rf value for substance Z

Calculate the Rf value for substance Y

Calculate the Rf value for substance X

Explain how the chromatogram shows that A is a pure substance and B is a mixture.

In chromatography, ink is the solvent.

Why is the start line drawn in pencil rather than pen?

Chromatography allows us to separate different elements in a compound.

In chromatography, the dyes are soluble in water.

What colours are in substance P?

Match the gas test to its positive result

This question is about gas tests - sort into Tests and Results

Put the order of Chromatography in order

Match the metal hydroxide with its color reaction.

How many substances are in dye A?

How many substances are in Dye B?

Calculate the Rf value for substance P

Calculate the Rf value for substance Z

Calculate the Rf value for substance Y

Calculate the Rf value for substance X

Explain how the chromatogram shows that A is a pure substance and B is a mixture.

A green ink contains 85% yellow dye and 15% blue dye.
Determine the simplest whole number ratio of yellow dye : blue dye in the green ink.

Yellow dye : Blue dye =

A fertiliser contains 0.225 g of iron per 3.0 g of fertiliser.

Which calculation gives the percentage of iron in the fertiliser?

Tick one

A green ink contains 85% yellow dye and 15% blue dye.
Determine the simplest whole number ratio of yellow dye : blue dye in the green ink.

Yellow dye : Blue dye =

A fertiliser contains 0.225 g of iron per 3.0 g of fertiliser.

Which calculation gives the percentage of iron in the fertiliser?

Tick one