Showing posts with label class8-chemistry. Show all posts
Showing posts with label class8-chemistry. Show all posts

Tuesday, 21 December 2021

CBSE Class 8 Science - Combustion and Flame - Worksheet-2 #class8Science #eduvictors #combustion

CBSE Class 8 Science - Combustion and Flame - Worksheet-2

CBSE Class 8 Science - Combustion and Flame - Worksheet #class8Science #eduvictors #combustion


Fill in the blanks with suitable words.


1. ________ gas in air is essential for combustion.


2. A chemical process in which a substance reacts with oxygen to give off heat is called __________.


3. During the process of combustion, _______ and light are given out.

Wednesday, 8 September 2021

CBSE Class 8 Chemistry - Metals and Non-Metals (MCQs) (#class8Chemistry)(#class8Science)(#eduvictors)

CBSE Class 8 Chemistry - Metals and Non-Metals (MCQs) 

CBSE Class 8 Chemistry - Metals and Non-Metals (MCQs)  (#class8Chemistry)(#class8Science)(#eduvictors)

Q1: All metals are solids except: 

(a) Sodium

(b) Calcium

(c) Mercury

(d) Copper



Q2: Which of the following metal does not react with dilute Hydrochloric acid?

(a) Iron

(b) Sodium

(c) Magnesium

(d) Copper

Thursday, 22 April 2021

CBSE Class 8 - Chemistry - Synthetic Fibres and Plastics - Plastics Uses and Its Impact on Environment (Q and A)(#class8Science)(#eduvictors)

CBSE Class 8 - Chemistry - Synthetic Fibres and Plastics - Plastics Uses and Its Impact on Environment (Q and A)

CBSE Class 8 - Chemistry - Synthetic Fibres and Plastics - Plastics Uses and Its Impact on Environment (Q and A)(#class8Science)(#eduvictors)

Q1: What is a plastic?

Answer: Plastic is also a polymer like the synthetic fibre. All plastics do not have the same arrangement of units. In some, it is linear, whereas in others it is cross-linked.

CBSE Class 8 - Chemistry - Synthetic Fibres and Plastics - Plastics Uses and Its Impact on Environment (Q and A)(#class8Science)(#eduvictors)


Q2: What are the main properties of plastics?

Answer: 

① Plastic is easily mouldable in all types of possible shapes. 

② Most plastics are light, chemically stable and do not rust. The weight of plastic is less when compared to that of metal.

③ Some types of plastics are good insulaters and have low thermal conductivity.

④ Plastic can be recycled, coloured, reused, rolled into sheets or made into wires.

⑤ Most plastics have poor heat resistance.

⑥ Plastics have good durability (lasts longer).