Question

Multiple b. solids and liquids only d. liquids only Select the correct option 1. When a change occurs a. energy is always absorbed e energy is either absorbed or given out b. energy is always given out d. energy changes do not occur 2. Water can dissolve a solids only a solids, liquids and Bases 3. In a physical change A. the molecules of a substance do not change b. the molecules of the substances change new substances are formed d. none of these 4. Chemical changes are a. always irreversible b. mostly irreversible c always reversible d. mostly reversible 3. If two substances are brought in contact, it will result in a. a physical change only b. a chemical change only c no changes d. a chemical change if they are heated together, otherwise a physical change 6. Which of these is a reversible change? a. Metal contracting b. Baking a cake c. Ripening of fruits d. Blooming of flowers 7. Which of these is an irreversible change? a. Melting of candle wax b. Burning of candle wax c. Melting of ice d. Boiling of water 8. How do you change burnt paper back into its original form? a. By cooling it b. By heating it d. You cannot c. By leaving it at room temperature CHANGES AROUND US • B-25​

Answer 1

Ans: I don't know anything