Question

can any body tell me the correct answers please...​

Answer 1

Answer:

(A) 1) cooking gas

2) melting

3) solids

4) wood

5) gold

(B) 1) chemicals

2) fertilizers

3) destructive

4) temperature

5) two

(C) 1) Fertilizer => increases the yield of crops

2) Solids => rigid

3) Boiling => substance change from solid to gas

4) Element => building blocks of materials

5) Iron and sulphur => magnets

(D) 1) Shooting star (because rest all are co-related to each other)

2) compounds (because rest all are mixtures of liquids)

3) Iron (because rest all are liquids)

4) mercury (because rest all are gaseos substance)

5) cotton (because cotton is natural Fibre and rest all are synthetic fibre)

(E) 1) Dmitri Mendeelev => Periodic Table

Marie Curie => Radium and polonium

John Dalton => Dalton's atomic theory

Joseph Priestley => Oxygen

2) Digestion relies on chemical reactions between food and acids and enzymes to break down molecules into nutrients the body can absorb and use. Soaps and detergents act as emulsifiers to surround dirt and grime so it can be washed away from clothing, dishes, and our bodies. Drugs work because of chemistry.

3) The spaces between the molecules or atom are called intermolecular spaces.

4) A compound contains atoms of different elements chemically combined together in a fixed ratio. An element is a pure chemical substance made of same type of atom. Compounds contain different elements in a fixed ratio arranged in a defined manner through chemical bonds.

5) There are two types of mixtures: heterogeneous and homogeneous. Heterogeneous mixtures have visually distinguishable components, while homogeneous mixtures appear uniform throughout.

Example = Heterogeneos => sugar and sand

Homogeneous => oil and water

Hope it helps you :)

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