13. Chemical Change and Chemical Bond

13. Chemical Change and Chemical Bond

1. Which Substances written on the left side of the arrow are original substances that take part in the reaction.

1) Catalysts
2) Atom
3) Products
4) reactants

2. Which reactants are take part inchemical reaction of respiration ?

1) carbon dioxide and oxygen
2) oxygen
3) glucose and oxygen
4) water and carbon dioxide

3. What is true about photosynthesis ?

1) Oxygen is mainly a byproduct of the process of photosynthesis
2) The main product of photosynthesis is glucose
3) All of these
4) The reactants for photosynthesis are light energy, water, carbon dioxide and chlorophyll,

4. Which gas is required for Combustion ?

1) Carbon dioxide
2) oxygen
3) Nitrogen
4) Helium

5. How many electrons first shell of atom hold ?

1) up to Five electrons
2) up to three electrons
3) up to two electrons
4) up to six electrons

6. Which gas is formed when baking soda is added to lemon juice?

1) Hydrogen
2) Nitrogen
3) Oxygen
4) Carbon dioxide

7. Which bond found in water molecule ?

1) metallic bond
2) Ionic bond
3) Polar bond
4) Covalent bond

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