CBSE Class 8 Science Materials Metals And Non Metals Worksheet Set B

Read and download free pdf of CBSE Class 8 Science Materials Metals And Non Metals Worksheet Set B. Students and teachers of Class 8 Science can get free printable Worksheets for Class 8 Science in PDF format prepared as per the latest syllabus and examination pattern in your schools. Standard 8 students should practice questions and answers given here for Science in Grade 8 which will help them to improve your knowledge of all important chapters and its topics. Students should also download free pdf of Class 8 Science Worksheets prepared by school teachers as per the latest NCERT, CBSE, KVS books and syllabus issued this academic year and solve important problems provided here with solutions on daily basis to get more score in school exams and tests

Materials Metals And Non Metals Class 8 Science Worksheet Pdf

Class 8 Science students should refer to the following printable worksheet in Pdf for Materials Metals And Non Metals in standard 8. This test paper with questions and answers for Grade 8 Science will be very useful for exams and help you to score good marks

Class 8 Science Worksheet for Materials Metals And Non Metals

A.TICK THE CORRECT OPTIONS:

Question. 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
Answer. c metalloids


Question. The only metal that exists as liquid at room temperature is_____

a. mercury
b. chlorine
c. bromine
d. gold
Answer. a-mercury


Question. The property of metals that allows them to be hammered into thin sheets is called____

a. ductility
b. hardness
c. malleability
d. sonority
Answer. c-malleability


Question. The oxides of non-metals are generally ________ in nature.

a. acidic
b. basic
c. neutral
d. Both a and c
Answer. a-acidic

 

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.
Answer.
1. Ductility   2. Bismuth
3 Diamond   4. Graphite
5 silver sulphide

 

C.VERY SHORT ANSWER QUESTIONS:-

Question. What happens when copper vessel is exposed to moist air for a long time?
Answer. When copper vessel is exposed to moist air for a long time, it slowly reacts with carbon dioxide and moisture (water) present in the air and loses its shine due to the formation of a green coating of copper hydroxide and copper carbonate.


Question. Name the second most abundant element in the earth’s crust.

Answer. Silicon is the second most abundant element in the earth’s crust.


Question. What is formed when metals react with oxygen?

Answer. When metals react with oxygen, it forms metal oxides that are basic in nature.


Question. Name the metal that is used in household electric wiring.

Answer. Copper is the metal that used in household electric wiring.


Question. Name one metal that is highly unreactive.

Answer. Gold


Question. Name (a) a solid metal and (b) a liquid metal at room temperature.

Answer. (a) Iron (b) Mercury

 

D.SHORT ANSWER QUESTIONS:-

Question. What happens when the following metals react with dilute hydrochloric acid?
(a) magnesium (b) aluminium
Answer.
(a). Magnesium reacts quite rapidly with dilute hydrochloric acid and forms magnesium chloride and hydrogen gas.
Mg              +     2HCl    ------------->   MgCl2     +    H2
Magnesium      hydrochloric acid       Magnesium      chloride hydrogen gas

(b ) Aluminium reacts with dilute hydrochloric acid and forms aluminium chloride and hydrogen gas.
2Al             +     6HCl -------------> 2AlCl3       +    3H2
aluminium    hydrochloric acid        aluminium       chloride hydrogen gas


Question. Which of the following elements would form (i) acidic oxides and (ii) basic oxides?

a. carbon b. magnesium c. sulphur d. zinc e. iron
Answer.
(a) carbon--acidic oxide
(b) magnesium—basic oxide
(c) sulphur—acidic oxide
(d) zinc—basic oxide
(e) iron—basic oxide


Question. What is meant by `rusting of iron’?

Answer. when an iron object is left in damp air (moisture) for a considered amount of time, it gets covered with a reddish-brown flaky substance. This is called rusting of iron.


Question. What 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.

Answer.-a. The magnesium would replace the copper from copper sulphate solution (blue colour) and form magnesium sulphate, which is colourless solution and a fine copper powder precipitate would form.
CuSo4 + Mg ----------------> MgSo4 + Cu
Copper magnesium magnesium sulphate copper (reddish
Sulphate (blue colour) (colourless solution) brown)


Question. Give reasons for the following:

a. Electric wires are made of copper.
Answer. Electric wires are made of copper because it conducts electricity with high flexibility and very little resistance.

b Gold and silver are used for making jewellery.
Answer. Metals such as gold and silver are quite unreactive, due to this property they are used for making jewellery.

C Graphite is used for making electrodes in electric cells.
Answer. Graphite is used for making electrodes in electric cells because Graphite is a good conductor of electricity and it is cheaper.


Question. 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.
Answer. a The string of guitar are made up of metal because it is sonorous. Sonority is the property of ringing when strikes by an object.

b What do we learn from Sonu?
Answer. We learn from Sonu that we should show our talent to everyone and help the needy.

 

LONG ANSWER QUESTIONS:-

Question. State any three physical and two chemical properties to prove that copper is a metal.
Answer. PHYSICAL PROPERTY:-

a. Copper is malleable and ductile.
b. Copper is good conductor of electricity.
c. Copper has high melting and boiling point.

CHEMICAL PROPERTY:-
a. Copper reacts with oxygen to form copper oxide which is basic in nature.
2Cu +O2  →   2CuO
b. Copper displaces less reactive metals from their salt solution.
Cu + Ag2So4   →  CuSo4 + 2Ag


Question. State any five physical properties on the basis of which metals can be distinguished from non-metals.

Answer.

worksheet 6 science clas 8

More Question

Name the following questions:-

1. Name some common non-metals used in our daily life.
2. Hardest naturally occurring substance.
3. Property of metals which make them useful as electric wires.
4. Non – metal which has metallic luster.
5. Two non metals which are soft solids.
6. Non metals do not conduct electricity or heat except for one . Name it.
7. An allotrope of carbon which is as tensile as steel.
8. Metals that are not attacked by cold water, boiling water or stream.
9. The property of metals by virtue of which these can beaten into sheets.
10.Non metals used in disinfection of drinking water.

II. Answer the following( in one or two words)

1. What are the elements called which can neither fit with metals nor non metals?
2. Which of the following metals is the best conductor of heat and electricity? Gold, Silver, Copper, Aluminum
3. Which property of metals makes them useful as ringing bells?
4. Arrange the following elements in order of increasing reactivity. Sodium, Magnesium, Copper, Zinc, Aluminum
5. An oxide solution of which of the following elements will turn blue litmus red.
6. Which non-metal is used in making pencil lead?
7. Identify the most reactive and least reactive metal amongst the following Aluminum, Potassium, Copper, zinc, Gold
8. State the nature of oxides of non-metals.
9. Give an example of neutral oxide .
10.Which non metal is kept under water and why?

 

Please refer to attached file for CBSE Class 8 Science Worksheet - Materials-Metals and Non-Metals Part B

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