CBSE Class 8 Science Materials Metals And Non Metals Worksheet

Read and download free pdf of CBSE Class 8 Science Materials Metals And Non Metals Worksheet. Students and teachers of Class 8 Science can get free printable Worksheets for Class 8 Science Chapter 4 Materials Metals and Non-Metals in PDF format prepared as per the latest syllabus and examination pattern in your schools. Class 8 students should practice questions and answers given here for Science in Class 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 with solutions on daily basis to get more score in school exams and tests

Worksheet for Class 8 Science Chapter 4 Materials Metals and Non-Metals

Class 8 Science students should refer to the following printable worksheet in Pdf for Chapter 4 Materials Metals and Non-Metals in Class 8. This test paper with questions and answers for Class 8 will be very useful for exams and help you to score good marks

Class 8 Science Worksheet for Chapter 4 Materials Metals and Non-Metals

Metals and non-Metals
 
Question 1. Which of the following can be beaten into thin sheets?
(a) Zinc (✓)    (b) Phosphorus    (c) Sulphur    (d) Oxygen
 
Question 2. Which of the following statements is correct?
(a) All metals are ductile.                        (b) All non-metals are ductile.
(c) Generally, metals are ductile. (✓)      (d) Some non-metals are ductile.
 
Question 3 Fill in the blanks.
 
(a) Phosphorus is a very reactive non-metal.
(b) Metals are good conductors of heat and electricity.
(c) Iron is more reactive than copper.
(d) Metals react with acids to produce hydrogen gas.
 
Question 4. Mark ‘T’ if the statement is true and ‘F’ if it is false.
(a) Generally, non-metals react with acids. ( F)
(b) Sodium is a very reactive metal. ( T)
(c) Copper displaces zinc from zinc sulphate solution. ( F)
(d) Coal can be drawn into wires. ( F)
 
Question 5. Some properties are listed in the following Table. Distinguish between metals and non-metals on the basis of these properties.

8th.sci.eng.july.Aug 3

 

Question 6- Give reasons for the following.
 
(a) Aluminium foils are used to wrap food items. 
Ans- Because aluminium metal is malleable. Therefore, it can be beaten into thin foils. Also a layer of aluminium oxide on aluminium foil make it non reactive with food. 
 
(b) Immersion rods for heating liquids are made up of metallic substances. 
Ans- Because metals are good conductors of heat and electricity. 
 
(c) Copper cannot displace zinc from its salt solution. 
Ans- Because copper is less reactive metal than zinc. 
 
(d) Sodium and potassium are stored in kerosene. 
Ans- Because they are highly reactive elements. They can easily catch fire even when in contact with air. 
 
Question 7. Can you store pickle in an aluminium utensil? Explain. 
Answer- As lemon pickle contains acid so it cannot be stored in metallic vessels as acids readily react with metals to produce hydrogen gas. 
 
Question 8. Match the substances given in Column A with their uses given in Column B.

8th.sci.eng.july.Aug 4

 

Question 9. What happens when 
(a) Dilute Sulphuric acid is poured on a copper plate? 
(b) Iron nails are placed in copper sulphate solution? 
Write word equations of the reactions involved. 
Answer- (a) No reaction will take place because copper is less reactive than hydrogen. 
Copper sulphate + Sulphuric acid → No reaction 
(b) When iron nails are placed in copper sulphate solution, Cu is displaced by iron and solution turns green 
from blue. Chemical equation is as follows:
Iron nails + Copper sulphate solution → Iron sulphate + copper. 
                    (blue)                                  (light green) 
Question 10. Soloni took a piece of burning charcoal and collected the gas evolved in a test tube. 
(a) How will she find the nature of the gas? 
(b) Write down word equations of all the reactions taking place in this process. 
Answer- (a) When charcoal is burnt in air, carbon dioxide gas is evolved. This gas when passed into the lime water, turns it milky. This is the test for CO2 gas. 
(b) Carbon + Oxygen → Carbon dioxide gas. 
 
Question 11. One day Reeta went to a jeweller’s shop with her mother. Her mother gave an old gold Jewellery to the goldsmith to polish. Next day when they brought the Jewellery back, they found that there was a slight loss in its weight. Can you suggest a reason for the loss in weight? 
Answer- In polishing, the jeweler put the gold Jewellery in a mild acid solution (aqua regia), which on reaction with acid goes into the solution. So, this process certain amount of gold is lost to the acidic solution. 
 
Question 12. Write differences between metals and non metals. 
Answer-

8th.sci.eng.july.Aug 5

 

ONE MARK MCQs 
 
1. Prabhsimran bought an idol (statue) made of copper from a fair, but he was astonished to see that the idol was covered with a light green coating on its surface after some days. The light green coating on the statue is mixture of - 
a) copper hydroxide and copper carbonate (✓)    b) copper sulphate and copper hydroxide 
c) copper sulphate and copper carbonate            d) none of these 
 
2. Name the metal which is used in thermometer and it is in liquid state at room temperature. 
a) Alcohol    b) Graphite    c) Mercury (✓)    d) Iron 
 
3. Tejinder accidentally left a non metal in open air, the non metal started burning. Name the non  metal? 
a) Mercury    b) Copper    c) Phosphorus (✓)    d) none of these 
 
4. In temples, bells are made up of metal instead of wood. Metal produces sound waves that’s why they are known as……………………. 
a) Conductors   b) Ductile   c) Weak     d) sonorous (✓) 
 
5. While performing test for the gas evolved, when the teacher brought a burning matchstick near the mouth of the test tube, the gas evolved burnt by producing a pop sound. Name the gas evolved. 
a) Carbon dioxide    b) Oxygen    c) Nitrogen    d) Hydrogen (✓) 
 
6. Balkaran immersed an iron nail into copper sulphate solution. The blue colour of copper sulphate solution changes to
a) blue to pink    b) blue to green(✓)    c) blue to black    d) none of these 
 
7. Mohit felt tired after doing a little work only. When he visited his doctor, he was told that he had iron deficiency. Where did Mohit have iron in his body?
a) In bones      b) In blood (✓)            c) In hair              d) none of these
 
8. Magnesium oxide is obtained by burning magnesium ribbon in air. What is the nature of magnesium oxide? 
a) acidic    b) basic (✓)    c) natural    d) none of these 
 
9. Raman is beating a piece of material into thin sheet. Which material is Raman beating from the given below 
a) copper (✓)    b) Sulphur    c) chlorine    d) oxygen 
 
10. Ravinder had seen that blacksmith is hammering iron nail and it turns into sheet. This conversion of nail to sheet depicts which nature of iron. 
a) ductility    b) Malleability (✓)    b) Lustre    d) sonorous 
 
11. Sarabjit’s mother was holding the metal’s kettle with a piece of cloth because it’s wooden handle was broken . She used cloth to lift the kettle because cloth is: 
a) good conductor of heat    b) poor conductor of heat(✓)    c) friend of heat    d) none of these 
 
12. Aman had learned that metal are hard but his teacher had cut one of the metal with knife. Name the metal used by the teacher. 
a) Potassium (✓)    b) Copper    c) Aluminum    d) Iron 
 
13. In the following circuit which material can be used instead of iron nail to complete the circuit.
 8th.sci.eng.july.Aug 6
a) Graphite (✓) b) plastic    c) Wood    d) Rubber
 
14. Which of the following can be beaten into sheets? 
a) Carbon   b) Phosphorous    c) Iodine    d) Iron (✓) 
 
15. Balkaran added zinc granules to ferrous sulphate solution . The green colour of ferrous sulphate solution disappeared after some time .What could be the possible cause of this colour disappearance. 
a) zinc is more reactive than iron so it displaces iron from its solution. (✓)
b) iron is more reactive than zinc so the colour disappear. 
c) can’t say anything about the colour change 
d) none of these. 
 
16. Anhad had dissolved ‘X’ compound into water. He obtained a bright blue coloured solution. Name compound X he had used. 
a) Zinc sulphate   b) Iron sulphate   c) Copper sulphate (✓)    d) none of these
 
17. Avnoor had used aluminium foil paper to complete the circuit. After inserting the battery , blubs glows. From this what we can say about the nature of aluminium foil. 
a) aluminium is metal (✓)          b) aluminium is non metal 
c) aluminium is bad conductor   d) none of these 
 
18. Manpreet dipped red litmus paper into rust solution. The colour of red litmus turns blue. What would be the possible cause of this change? 
a) Rust solution is acidic in nature.    b) Rust solution is basic in nature. (✓) 
c) Rust solution is neutral.                d) None of these. 
 
19. Gagan was taught by his teacher that hydrogen gas is produced when metals react with acid ,but when he placed a metal in dilute hydrochloric acid , no reaction occurred . Which metal did he placed in dilute HCl ?
a) Magnesium     b) Iron     c) Copper (✓)     d) Aluminium 
 
20. Teacher asked Manpreet about a non metal which has lustre. Name that non metal?
a) Coal b) Chlorine    c) Phosphorus     d) graphite (✓)
 
21. Simran enquired her mother that why can’t we store or keep lemon pickle in Aluminium vessel?
a) pickle turn sour.                               b) pickle turn sweet 
c) pickle becomes poisonous              d) vessel will get corroded (✓) 
 
22. Element copper is mainly used to manufacture electrical wires and cooking utensils. Which of the following is NOT a property of copper ? 
a) ductility b) malleability   c) low melting point (✓)     d) good conductor of heat
 
23. Two elements A and B on burning in air give corresponding oxides . Oxides of both A and B are soluble in water. The aqueous solution of A is alkaline and reacts with aqueous solution of oxide of B to give another compound. Identify A and B.
a) A and B are metals                          b) A and B are non-metals
c) A is metal and B is non-metal (✓)    d) A is non-metal and B is metal
 
24. Name the least reactive metal out of the following?
a) Silver    b) Gold    c) Copper    d) Platinum(✓) 
 
25. Harpreet burnt a piece of charcoal (carbon) and collected the gas evolved during the burning process. Name the gas he collected.
a) Oxygen   b) Sulphur dioxide   c) Carbon dioxide (✓)    d) Carbon mono-oxide 
 
26. Name a metal that is so soft that it can be cut with knife and also it is so reactive that it can not be placed in open air.
a) Phosphorus    b) Iron    c) Potassium (✓)    d) Aluminium 
 
27. Mehak observed the lustre of new copper utensils is lost after some period of usage . A green coloured layer is formed over them. What is the reason behind this ? 
a) Copper oxide layer is formed over it    b) Copper carbonate layer is formed over it (✓) 
c) Due to corrosion of copper (✓)            d) None of these
 
28. What is the nature of oxide of non metal ? 
a) Basic    b) Acidic (✓)    c) Neutral     d) None of these 
 
29. Name the type of reaction in which more reactive metal displaces less reactive metal from its salt solution? 
a) Combination reaction        b) Displacement reaction (✓) 
c) Decomposition reaction     d) Doubled displacement reaction 
 
30. Which of the following is not a ductile element? 
a) Silver    b) Copper    c) Sulphur (✓)    d) Aluminium 
 
31. Teacher gave Vicky four different samples of elements and asked him which sample can be beaten into sheet by hammering? 
a) Crystal of iodine   b) Piece of sulphur   c) Piece of iron (✓)   d) Piece of zinc 
 
32. Name the Non metal element whose isotope is good conductor of electricity? 
a) Gallium    b) Silicon    c) Carbon (✓)    d) Copper 
 
33. Study the characteristics of substance ‘X’ given below.
1. High melting point 
2. Good conductor of electricity
3. Malleable
Based on the above characteristics, what could ‘X’ be? 
a) Silicon    b) Sodium chloride   c) Iron (✓)    d) Carbon 
 
34. Which of the following element react vigorously with oxygen? 
a) Carbon    b) Sodium (✓)    c) Silver    d) Gold 
 
35. Out of the following which is safer to store Sodium and Potassium? 
a) Water     b) Kerosene oil (✓)    c) Glass bottle     d) Plastic bottle 
 
36. Which of the following non metal can be safely kept in water? 
a) Oxygen    b) Phosphorous (✓)    c) Nitrogen    d) Chlorine 
 
37. Which gas is produced when Aluminium metal reacts with Sodium Hydroxide solution? 
a) Oxygen    b) Hydrogen (✓)     c) Carbon dioxide     d) nitrogen 
 
38. What is the nature of Sulphur dioxide gas? 
a) Acidic (✓)    b) Basic    c) Neutral    d) Both 
 
39. Inside of food cans are coated with tin and not with zinc because 
a) Zinc is costlier than tin                   b) zinc has higher melting point than tin 
c) Zinc is more reactive than tin (✓)    d) zinc is less reactive than tin 
 
40. Name the non metal whose violet colored solution is used as an antiseptic? 
a) Phosphours    b) Iodine (✓)    c) Sulphur     d) Calcium

 

More questions-

Question. Differentiate between metal and non-metal on the basis of chemical properties.
Ans. Difference between metals and non-metals on the basis of chemical properties.

Metals and Non metals_1

Question. (i) Write the electron-dot structures for sodium and magnesium.
(ii) What are the ions present in Na2O and MgO.
Ans. (i) Electron-dot structures of sodium and magnesium:

Metals and Non metals_2

      

(ii) Ion present in Na2O is Na+ and O2-
             Ion present in MgO is Mg2+ and O2-

Question. A green layer is gradually formed on a copper plate left exposed to air for a week in a bathroom. What Could this green substance be?
Ans. It is due to the formation of basic copper carbonate (CuCO3.Cu(OH)2.

Question. Which gas is liberated when a metal reacts with an acid? How will you test the presence of this gas?
Ans. Hydrogen gas is formed. Bring a burning matchstick near to it, H2 will burn explosively with ‘pop’ Sound.

Question. (a) In the formation of compound between two atoms A and B, A loses two electrons and B gains one Electron.
(i) What is the nature of bond between A and B?
(ii) Suggest the formula of the compound formed between A and B.
(b)On similar lines explain the formation of MgCl2 molecule.
(c)Common salt conducts electricity only in the molten state. Why?
(d)Why is melting point of NaCl high?
Ans. (a)

Metals and Non metals_3

Metals and Non metals_4

(c)Common salt is an ionic compound which conducts electricity only in molten state because in molten state
The electrostatic forces of attraction between opposite charged ions are overcome due to heat.
Thus ions Move freely and conduct electricity.
(d) NaCl is an ionic compound so there is a strong force of attraction between the positively charged Na Ion and negatively charged chloride ion. Therefore, a considerable amount of energy is required

Question. Explain the following:
(a) Reactivity of Al decreases if it is dipped in HNO3.
(b) Carbon cannot reduce the oxides of Na or Mg.
(c) Iron articles are galvanized.
Ans. (a) When Al metal reacts with HNO3, Al2O3 is formed which further gets deposited on aluminum metal. Hence, more Al metal is not available for the reaction because Al2O3 layer is passive in nature.
(b) Na and Mg both metals are very reactive. These metals have more affinity towards oxygen than carbon. Hence, carbon cannot reduce the oxides of these metals.
(c) Galvanization is a process to protect iron from rusting. Iron get rusted when come in contact with air and moisture.

 

1. Following diagrams explain which Properties of metals .
Beating iron nail with           hammer Passing electricity through any
                                                           Material

""CBSE-Class-8-Science-Materials-Metals-And-Non-Metals-Worksheet-Set-A

""CBSE-Class-8-Science-Materials-Metals-And-Non-Metals-Worksheet-Set-A-1

7. Name the following type of reaction :-
Copper sulphate (CuSo4) + Zinc (Zn) = Zinc Sulphate (Znso4) + Cu (Copper)
____________________ (Displacement / addition)

8. Write any three differences between metals and non-metals on the basis of following characters -
Property                         Metal                   Non-Metal
1) Appearance            _____________    ______________
2) Conduction of heat  _____________   ______________
3) Malleability             _____________   ______________
4) Ductility                 _____________   ______________

Write one word for the following : 
i) Materials having properties of both metals and non-metals __________.
ii) The property of metals due to which they produce sound _____________.
iii) The property of metals due to which they can be beaten into sheets _________.
iv) Nature of metal oxides is ______________.
v) The property of metals by virtue of which they can be drawn into wires ________.

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?

METALS AND NON METALS

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?

III. Fill in the blanks

1. The number of metals is much _____________________ than non metals.

2. The smallest unit of an element is known as _________________________.

3. Metals like _____________________ and ____________________ exist in liquid state.

4. Elements which do not react chemically are known as _______________________.

5. Oxides of metals which are acidic as well as basic in nature are called _________ oxides.

IV. Multiple Choice Questions

1. Pb is the symbol of
a. Copper
b. Phosphorus
c. Lead

2. Helium, Neon, Argon are
a. Metals
b. Noble gases
c. Metalloids

3. Which of the following metal burns with dazzling while flame.
a. Sodium
b. Potassium
c. Magnesium

4. Which of the following displaces Hydrogen on reaction with dilute mineral acids.
a. Silver
b. Sodium
c. Sulphor

5. Metals which are used for making electric wires and cooking vessels-
a. Copper and Aluminum
b. Copper and Iron
c. Aluminum

6. Non metals which is used in making microchips
a. Carbon
b. Silicon
c. Sulphur

7. Metals which can be cut with knife.
a. Iron
b. Calcium
c. Sodium

8. Compounds of which non-metal are used as fertilizers
a. Chlorine
b. Nitrogen
c. Phosphorus

9. Alloys of which of the following metal are used for making aero planes and automobile engine.
a. Copper
b. Aluminum
c. Iron

10. Metals react with oxygen to form their oxides which are generally.
a. Neutral in nature
b. Acidic in nature
c. Basic in nature

Q.1. Fill in the blanks

1) __________ and _________ metals are soft and can be cut with a knife.

2) __________ is the only metal, which is found in liquid state at room temperature.

3) A suspension of rust in water turns __________litmus ____________. So it is __________ in nature.

4) In general, metallic oxides are ___________ in nature whereas oxides of nonmetals are _______ in nature.

5) Metals react with acids to produce___________ gas which burns with a __________ sound.

6) A _____________ reactive metal can replace a ___________ reactive metalfrom its salt solution.

7) The elements which possess character of both metals and non metals are called __________.

8) The non-metal _______________ is used in water purification process.

9) The non-metal ________________ is found in the liquid state

Q.2. Give reasons for the following.

1) Bells used in temples are made of metals and not wood.

2) A copper vessel when exposed to moist air for long acquires a dull green coating.

3) Sodium metal is kept stored in kerosene.

4) Phosphorus is kept stored in water.

5) Gold and Silver are used for making jewellery.

6) Copper is used in electrical wiring.

Q3. Choose the correct answer.

1) The property of metals by which they can be beaten into thin sheets is called:
(i) Malleability
(ii) Ductility
(iii) Conductivity (iv) None of the above

2) Materials which are generally hard, lustrous, malleable, ductile, sonorous and good conductors of heat and electricity are:
(i) Non-metals
(ii) Metals
(iii) Metalloid
(iv) None of the above

3) Which of the following is a non-metal:
(i) Sodium
(ii) Aluminum
(iii) Sulphur
(iv) Calcium

4) The metal which is the best conductor of electricity is:
(i) Silver
(ii) Gold
(iii) Copper
(iv) Zinc

Q.4. How do metals and non-metals differ in their reaction with acids?

Q.5. What are displacement reactions? Give one example.

Q.6. Write four differences in the physical properties of metals and non metals.

Q.7. When zinc granules are put in copper sulphate solution and left undisturbed for sometime, we find that the blue colour of the solution disappears and a powdery red mass is deposited at the bottom of the beaker. Write the equation involved. What type of reaction is this? Explain the observations.

Q.8. . When we keep copper turning in zinc-sulphate solution for sometime, we find that there is no change. Explain why is it so?

Q.9.What is reactivity series of metals? Arrange the following metals in decreasing order of reactivity- Iron, Sodium , Copper, zinc.

Q10 Sneha and Neha are friends.Sneha belongs to a rich family and believes in throwing things after use,while Neha does not like wastage and reuses things.Answer the following questions
(i) How reusing things avoids wastage?
(ii) List any two examples where you can reuse things.
(iii) What change can you make in your habits to become more eco-friendly?

Chapter 01 Crop Production and Management
CBSE Class 8 Science Crop Production And Management Worksheet
Chapter 02 Microorganisms: Friend or Foe
CBSE Class 8 Science Micro Organisms Friend And Foe Worksheet
Chapter 03 Synthetic Fibres and Plastics
CBSE Class 8 Science Synthetic Fibers And Plastics Worksheet
Chapter 04 Materials Metals and Non-Metals
CBSE Class 8 Science Materials Metals And Non Metals Worksheet
Chapter 07 Conservation of Plants and Animals
CBSE Class 8 Science Conservation Of Plants And Animals Worksheet
Chapter 08 Cell Structure and Functions
CBSE Class 8 Science Cell Structure And Functions Worksheet
Chapter 10 Reaching the Age of Adolescence
CBSE Class 8 Science Reaching The Age Of Adolescence Worksheet
Chapter 14 Chemical Effects of Electric Current
CBSE Class 8 Science Chemical Effect Of Electric Current Worksheet
Chapter 17 Stars and the Solar System
CBSE Class 8 Science Stars And The Solar System Worksheet
Chapter 18 Pollution of Air and Water
CBSE Class 8 Science Pollution Of Air And Water Worksheet

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