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Reaction Acids with Metals

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Question

Complete the crossword Fig. 6.1 with the help of the clues
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2. A chemical process in which a substance reacts with oxygen to give off heat. (10)

3. Petrol is used as a __________ in automobiles. (4)

6. It is as hard as stone and black in colour .(4)

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Q. Question 38
Complete the crossword Fig. 6.1 with the help of the clues :

Across
1. Non-metal which catches fire if exposed to air. (10)
3. The lowest temperature at which a substance catches fire is called its ___ temperature. (8)
5. The most common fire extinguisher. (5)

Down
4. Petrol is used as a ___ in automobiles. (4)
6. It is as hard as stone and black in colour. (4)

Q. A chemical process in which a substance reacts with oxygen to give off heat is called as:

Q. Complete the crossword given in Fig. 4.3 with the help of the clues.

Across

1. Which is generally hard, ductile, malleable and sonorous.

2. A metal is called so it can be drawn into wires.

3. Metal bells are used because of this property.

Down

4. A metal generally used for making jewellery.

5. A metal which is liquid at room temperature.

6. A metal which reacts with acid as well as base to form

hydrogen gas.

7. Substances used to enhance the growth of plants.

8. Property by virtue of which metals can be beaten into thin

sheets.

Q. Complete the crossword given below with the help of clues
Across
1. Substance used as synthetic wool (7 letters)
2. A plastic used for making containers and carry bags (9 letters)
3. Substance made up of a large number of smaller molecules (7 letters)
4. Another name for this compound is artificial silk (5 letters)
Down
5. A type of fibre obtained naturally from the cocoon (4 letters)
6. A synthetic fibre classified as a polyester (8 letters)
7. A polymer used for making rope (5 letters)

Q. Fill in the blanks using the words given in the box.

ignition, petrol, combustion, calorific value, combustible, inflammable

(a) A chemical process in which a substance reacts with oxygen to give off heat is called ______.
(b) Wood, paper, CNG are __________ substances.
(c) The lowest temperature at which a substance catches fire is called its ______ temperature.
(d) Ignition temperature of _______ is lower than that of wood.
(e) The substances which have very low _______ temperature and can easily catch fire with a flame are called _______ substances.
(f) The amount of heat energy produced on complete combustion of 1kg of a fuel is called its ______.

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Reaction Acids with Metals

Standard VII Chemistry

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