Basics of Chemistry Worksheet-2

Basics of Chemistry Worksheet-2

1. A compound is made by chemically combining two or more elements. Properties of a compound are ______ from the properties of elements it contains.

(a) doubled       (b) added           (c) same             (d) different

2. How can you break a compound into its simpler elements?

(a) By physical reactions.           (b) By chemical reactions.

(c) By force.                                    (d) It can not be done.

3. Which of the following will not happen to the molecules of liquid when extra heat is applied to it?

(a) Molecules will receive energy from heat.

(b) Molecules will move faster.

(c) Molecules will come closer.

(d) Distance between molecules will increase.

4. Which action is needed to make icecream?

(a) Heating liquid above boiling point.

(b) Heating liquid above freezing point.

(c) Cooling liquid below boiling point.

(d) Cooling liquid below freezing point.

5. Which of the following is a solution?

(a) Mixture of Sand and Powder

(b) Salt dissolved in water

(c) Whipped Cream

(d) Soap bubbles

6. Hydrogen is a gas. Oxygen is a gas. When combined they make _____.

(a) a gas called hydro-oxide.

(b) a liquid called water.

(c) a solid called hydro-peroxide.

(d) a liquid called oxidized hydrogen.

7. The temperature at which a solid turn into liquid is called ______.

(a) Boiling point                            (b) Melting point

(c) Flash point                               (d) Vapor point

8. Materials that allow heat and electricity to pass through without any obstacle are called ______.

(a) Magnet        (b) Non-metal  (c) Insulator      (d) Conductor

9. Which of the following is another way to describe density?

(a) It describes how tightly or loosely the molecules of the matter are packed.

(b) It describes how strongly the molecules of the matter are attached.

(c) It describes how much energy the molecules of the matter have.

(d) It describes how big the molecules are.

10. Change in which of the following can change the density of a matter?

(a) Wind speed                               (b) Time

(c) Light                                           (d) Temperature

Answer Key:

(1)–(d); (2)–(b); (3)–(c); (4)–(d); (5)–(b); (6)–(b); (7)–(b); (8)–(d); (9)–(a); (10)–(d)