Pure Substances

Q.

Is water an element or a compound? Give reason to support your statement.

Q.

Milk is a pure substance.

1. True

2. False

Q.

Find the odd one out. Give a reason for your answer.

Air, water, common salt, and lime.

Q.

Give three characteristics of pure substances.

Q.

Which of the following is a pure substance?

1. Gold

2. Wood

3. Brick

4. Mercury

Q.

Which of the following is the simplest form of matter?

1. Element

2. Mixture

3. Compound

4. None of these

Q. Compounds are formed when atoms of _____elements combine.

1. Same
2. Different

Q.

The constituent particles of a pure substance are different in their chemical nature.

1. element

2. mixture

Q.

Classify the following into elements and compounds:

Water, Hydrogen, Salt, Gold, Carbon dioxide, Iron

1. Elements - Hydrogen, Gold

   Compounds - Water, Salt, Carbon dioxide, Iron

2. Elements - Hydrogen, Gold, Iron

   Compounds - Water, Salt, Carbon dioxide

3. Elements - Hydrogen, Gold, Iron, Carbon dioxide

   Compounds - Water, Salt

4. Elements - Water, Salt, Carbon dioxide

   Compounds - Hydrogen, Gold, Iron

Q. Which amongst the following is a pure substance?

1. Carbon dioxide
2. Milk
3. Saline water
4. 22 carat Gold

Q.

Few properties are mentioned below. Specify the property as mixture or compound:

STATEMENT 1: The constituents can be separated easily by physical means.

STATEMENT 2: Has a variable composition.

STATEMENT 3: Has a fixed melting and boiling point.

STATEMENT 4: Shows entirely different properties from constituent elements.

1. 1 and 3 are compounds are rest are mixture.

2. statement 1 is mixture and rest are compound.

3. statement 3 and 4 mixture and rest are compound.

4. statement 1 and 2 are mixtures and 3 and 4 are compounds.

Q. How many molecule of O2 are present in 1L air containing 80% volume of O2 at STP?

Q.

Define two types of pure substances. Give three examples of each.

Q.

Is water an element or a compound? Give reason to support your statement.

Q.

State if the following statement is True or False. Correct the false statement.

Both elements and compounds are pure substances.

1. True
2. False

Q. A pure substance has a very sharp melting and boiling point. True or false?

1. True
2. False

Q. Match the type of substance with its example.

1. Pure substance
2. Heterogeneous mixture
3. Homogeneous mixture
4. 
5. 
6. 

Q. Chemical composition of some matter is in the fallowing table .Identify the main type of matter from their. Name of matter Chemical composition Main type of matter Sea water Distilled water Hydrogen gas filled in a balloon The gas in LPG cylinder Baking soda Pure gold The gas in oxygen cylinder Bronze Diamond Heated white powder of blue vitriol Lime stone Dilute hydrochloric acid

H2O + NaCl + MgCl2+...
H2O
H2
C4H10 + C3H8
NaHCO3
Au
O2
Cu + Sn
C
CuSO4
CaCO3
HCl + H20

Q.

Pure substances are classified into………… and ………………

Q. A pure substance is made up of only one type of particles.

1. True
2. False

Q. A glass of milk is an example of a pure substance.

1. False
2. True

Q. Define

$\left(a\right)$ Soft water

Q. Pure substances are classified as:

1. elements and mixtures
2. compounds and mixtures
3. molecules and mixtures
4. elements and compounds

Q. Pure substances can be classified as _____________ and ___________.

1. elements, compounds
2. elements, mixtures
3. compounds, mixtures
4. molecules, mixtures

Q.

Give reason : A mixture of oil and water, retains the properties of its constituent compounds.

Q. Which among the following are pure substances?

1. Sugar
2. Salt
3. Aerosol
4. Soft drinks
5. Soil
6. Diamond
7. Sulphur
8. Baking soda

Q. Which one of the following is a pure substance?

1. Soft drink
2. Salt water
3. Sugar crystals
4. Muddy water

Q.

Unlike any other compound in our known universe, _________ molecule expands in volume instead of compacting after reaching freezing point.

1. Water

2. Hydrogen

3. Alcohol

4. Mercury

Q. Sugar particles are considered to be pure substances.

1. True
2. False

Q. cannot be broken down into simpler components using any chemical process.

1. Elements
2. Compounds
3. Mixtures