LSS: Chemical Changes (11.3 & 11.4) [Student-Generated Qns]

Which is not a chemical change?

• 1. Freezing

• 1. Rusting

• 1. Combustion

• 1. Sublimation of dry ice into carbon dioxide vapor

What chemical reactions requires heat or an increase in temperature?

• Oxidation
  

• Combustion

• Photosynthesis

• Thermal Decomposition

What does combustion of fuels produce?

(More than 1 correct answer)

• Big explosion

• carbon monoxide

• carbon dioxide

• sulfur dioxide

What are involved in the rusting process?

• 1. Water, Hydrogen, Oxygen

• Oxygen, Water and Iron

• Oxygen, Water and Glucose

• None Of The Above

Which of the following is a solution to prevent rusting?

• 1. Drying

• 1. Vacuuming 

• Washing

• Burning

What is not a way to prevent rusting?

• Galvanising

• Oiling

• Soaking the material in water

• Electroplating

Answer explanation

Explanation:
You have to prevent the material from having any contact with water or oxygen

Who established the Nobel prize?

• Ms Wong

• Nobell Alfred

• Alfred Nobel

What process causes water to break down into its constituent elements?

• 1. Oxidation

• 1. Thermal decomposition

• 1. Electroplating

• 1. Electrolysis

With only a single gram of gold, how do you plate a silver ball?

• 1. Electrolysis

• 1. Oxidation

• 1. Combustion

• 1. Electroplating

What would result from the mixing of acid and alkali?

• Salt + water
  

• Salt + carbon dioxide

• Salt + hydrogen + water

• None of the above