Question

1. While cooking , closing the cooking pan with a lid allows the food to cook faster. Which of the following statement explains this correctly? a) The lid reduces the loss of heat through convection to the surroundings b) The lid reduces the loss of heat through radiation to the surroundings c) The lid reduces the loss of heat through conduction to the surroundings d) The lid prevents a convection current from being set up 2. Compounds are substances in which the constituent elements always combine in a specific ratio. Which of these substance is not a compound ? a) sulphur dioxide b) water c) air d) table salt 3.The atomic number of oxygen is 6. This means that oxygen has 6 positively charged particles called protons in its nucleus . An atom does not posses any charge. What is the number of electrons ( negatively charged particles) in an oxygen atom? a) 0 b) 2 c)6 d) 12

Answer 1

Answer:

I know the answer only for one the atomic number of oxygen is 8