Is Matter Around Us Pure? Science - Is Matter Around Us Pure?

Which of the following can be called a suspension?

1. Milk.
2. Milk of magnesia.
3. Salt solution.
4. Vinegar.

Which of the following mixture cannot be separated by using water as the solvent?

1. Copper sulphate and sand.
2. Sand and potash alum.
3. Sand and sulphur.
4. Sugar and sand.

The rusting of an iron object is called:

1. Corrosion and it is a physical as well as a chemical change.
2. Dissolution and it is a physical change.
3. Corrosion and it is a chemical change.
4. Dissolution and it is a chemical change.

The correct increasing order of the boiling points of liquid oxygen, liquid argon and liquid nitrogen present in liquid air is:

1. Nitrogen, oxygen, argon.
2. Nitrogen, argon, oxygen.
3. Argon, oxygen, nitrogen.
4. Oxygen, argon, nitrogen.

You are given a mixture of iodine in alcohol called tincture iodine. Which method will you use to recover both, iodine as well as alcohol, from this mixture?

1. Evaporation.
2. Simple distillation.
3. Fractional distillation.
4. Crystallization.

Brass is an alloy which is considered a _________.

Immiscibl liquids are separated by using a __________.

A mixture of kerosene and petrol can be separated by _________.

An element is made up of only one kind of _________.

Miscible liquids are separated by __________.

Milk is a pure substance.

Name one pair of liquids which can be separated by using a separating funnel.

Alcohol can be separated from a mixture of alcohol and water by a separating funnel.

1. Bread is an example of solid foam.

2. Sponge is an example of solid sol.

What type of colloids are bread and sponge?

Classify the following as elements or compounds:
Iron, Iron sulphide, Sulphur, Chalk, Washing soda, Sodium, Carbon, Urea

What is the other name of homogenous mixtures?

How would you confirm that a colourless liquid given to you is pure water?

How will you separate a mixture of chalk powder and water?

What elements do the following compounds contain?
Sugar, Common salt

What is the difference between colloids and suspensions?

Define:

1. Solute
2. Solvent

How much water should be mixed with 12ml of alcohol so as to obtain 12% alcohol solution?

What is a suspension? Give two examples of suspensions.

Which of the following are physical changes and which are chemical changes?

1. Burning of a magnesium wire.
2. Freezing of water.
3. Rusting of iron.
4. Glowing of an electric bulb.

How will you separate a mixture of iron filings and powdered carbon?

What is chromatography? State its two applications.

In what respects does a true solution differ from a colloidal solution?

How will you separate a mixture of sodium chloride and sand?

How will you separate a mixture of cooking oil (groundnut oil) and water?

Draw a labelled diagram of the fractional distillation apparatus used for separating a mixture of alcohol and water.

Give the main differences between physical changes and chemical changes.

How will you separate common salt, sand and iron filings from their mixture?

You are given a mixture of water, groundnut oil and common salt. How will you separate groundnut oil and common salt from it?

Differentiate between a saturated and an unsaturated solution. How will you test whether a given solution is saturated or not?