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ScienceClass 8ICSE

An element forms an oxide which is acidic in nature. State whether the element is a metal or a non-metal?

Answer An element which forms an oxide which is acidic in nature is a non-metal. This is because nonmetallic oxides react with water to form acids.

ScienceClass 8ICSE

Iron metal reacts slowly with the oxygen and moisture of damp air to form rust. State whether the rust formed is acidic, basic, or neutral.

Answer Iron metal reacts slowly with the oxygen and moisture of damp air to form rust. Rust is metal oxide hence, it is basic in nature.

ScienceClass 8ICSE

State one chemical property which can be used to distinguish a metal from a non-metal.

Answer The formation of positive ions by metals is one chemical property that can be used to distinguish a metal from a non-metal.

ScienceClass 8ICSE

How do metal oxides differ from non-metal oxides?

Answer Metal oxides are basic in nature and turn red litmus blue. For example: Magnesium oxide. Non-metal oxides are acidic or neutral in nature. The acidic oxides turn blue litmus red. For example: Carbon dioxide.

ScienceClass 8ICSE

Name a non-metal which is a good conductor of electricity?

Answer Graphite, the form of carbon is a non-metal which is a good conductor of electricity

ScienceClass 8ICSE

Name a non-metal which is very hard.

Answer A non-metal that is very hard is diamond.

ScienceClass 8ICSE

Name the property of iron metal due to which it can be hammered to make objects of different shapes such as an axe, a spade or a shovel.

Answer Malleability is the property of iron metal due to which it can be hammered to make objects of different shapes such as an axe, a spade or a shovel

ScienceClass 8ICSE

If a metal coin is dropped on a hard floor, it produces a ringing sound. What is this property of metals known as?

If a metal coin is dropped on a hard floor, it produces a ringing sound, this property of metals known as sonorous.

ScienceClass 8ICSE

N ame two metals which are soft and can be easily cut with a knife.

Answer The two metals which are soft and can be easily cut with a knife are potassium and sodium.

ScienceClass 8ICSE

Name the property; (a) Which allows metals to be hammered into thin sheets. (b) Which enables metals to be drawn into wires.

Answer Malleability Ductility

ScienceClass 8ICSE

Name one metal and one nonmetal which exist in the liquid state at room temperature.

Answer Metal which is liquid at room temperature is Mercury and non-metal which is liquid at room temperature is Bromine.

ScienceClass 8ICSE

What is the general name of the elements whose properties are intermediate between those of metals and nonmetals?

Answer The general name of the elements whose properties are intermediate between those of metals and nonmetals metalloids

ScienceClass 8ICSE

Fill in the following blanks with suitable words (a) Alcohol is produced with the help of (b) Blue-green algae fix directly from air to enhance fertility of soil. (c) Micro-organisms can be seen with help of (d) Cholera is caused by . (e) Common salt has been used to preserve and for ages. (f) The food material which is preserved by pasteurization is (g) As a result of the nitrogen cycle, the percentage of nitrogen in the atmosphere remains more or less

Answer Answer Alcohol is produced with the help of Blue-green algae fix nitrogen directly from the air to enhance fertility of Micro-organisms can be seen with the help of a Cholera is caused by Common salt has been used to preserve meat and fish The food material which is preserved by pasteurization is As a result of the nitrogen cycle, the percentage of nitrogen in the atmosphere remains more or less

ScienceClass 8ICSE

Name two leguminous plants that can fix nitrogen.

Leguminous plants like peas and beans can fix nitrogen gas of the air into compounds of nitrogen.

ScienceClass 8ICSE

What type of plants can fix nitrogen gas of the air into compounds of nitrogen?

Answer Leguminous plants can fix nitrogen gas of the air into compounds of nitrogen.

ScienceClass 8ICSE

Name the microorganisms present in the soil and in the root nodules of leguminous plants which can fix atmospheric nitrogen.

Answer Blue-green algae and Rhizobium bacteria ( nitrogen-fixing bacteria) is present in their root nodules can fix atmospheric nitrogen.

ScienceClass 8ICSE

Name any two special chemicals which are used as food preservatives.

Answer Sodium benzoate and sodium meta bisulphate are two special chemicals which are used as food preservatives.

ScienceClass 8ICSE

Name two food materials that are preserved by using common salt.

Answer Fish and meat are preserved by using common salt.

ScienceClass 8ICSE

Name two food materials which can be preserved by using oil or vinegar.

Answer The food materials which can be preserved by using oil or vinegar are meat and fish

ScienceClass 8ICSE

Name two food materials which can be preserved by using sugar.

Answer Food materials that can be preserved by using sugar are jellies and jam.

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