Can anyone send a worksheet on metals and non metals and combustion of flame for class 8
Answers
Answer:
Explanation:
A.TICK THE CORRECT OPTIONS:
1 The elements that have some properties of metals and some
properties of non-metals are called____
a. ores b. metal mix c. metalloids d. gangue
2 The only metal that exists as liquid at room temperature is_____
a. mercury b. chlorine c. bromine d. gold
3 The property of metals that allows them to be hammered into thin
sheets is called____
a. ductility b. hardness c. malleabilityd. sonority
4 The oxides of non-metals are generally ________ in nature.
a. acidic b. basic c. neutral d. Both a and c
5 Metals react with water to form ________ gas.
a. hydrogen b. nitrogen c. oxygen d. ozone
B.FILL IN THE BLANKS:-
1. The property that allows the metals to be drawn into thin wires is
called _______.
2. Metals like ______ is a poor conductor of heat.
3. _______is the hardest known substance in nature.
4. ______is a non metal that is a good conductor of electricity.
5. Silver objects turn black due to the formation of a layer of ______ on
their surfaces.
C.VERY SHORT QUESTIONS:-
Q.1What happens when copper vessel is exposed to moist air for a
long time?
Q.2 Name the second most abundant element in the earth’s crust.
Q.3What is formed when metals react with oxygen?
Q.4 Name the metal that is used in household electric wiring.
Q.5 Name one metal that is highly unreactive.
Q.6 Name (a) a solid metal at room
temperature.
(b) a liquid metal at room
temperature.
D.SHORT ANSWER QUESTIONS:-
Q.1What happens when the following metals react with dilute
hydrochloric acid? with equation.
(a) magnesium
(b) aluminium
Q.2Which of the following elements would form
(i) acidic oxides
a. carbon b. magnesium c. sulphur d. zinc e. iro
Q.3What is meant by `rusting of iron’?
Q.4What will be the change in the colour of copper sulphate solution
when magnesium is added to it? Write a balanced chemical equation
for the same.
Q.5 Give reasons for the following:
a. Electric wires are made of copper.
b Gold and silver are used for making jewellery.
C Graphite is used for making electrodes in electric cells.
Q.6 In evening, Sonu plays guitar for the poor children of his colony.
They all enjoy listening to the guitar. Sonu even teaches some of them
how to play guitar, free of cost.
a. Name the property because of which strings in guitar are made of
metal.
b What do we learn from Sonu?
LONG ANSWER QUESTIONS:-
Q.1 State any three physical and two chemical properties to prove
that copper is a metal.
Q.2 State any five physical properties on the basis of which metals can
be distinguished from non-metals.
this is the worksheet i hope this helps you
please mark it as brainliest