Science 3rd tri

1. What is a mixture?

• A combination of two or more substances that are chemically bonded
• A combination of two or more substances that are physically combined but not chemically bonded

2. Which of the following is an example of a mixture?

• Seawater
• Oxygen

3. How can mixtures be separated?

• By chemical reactions
• By physical methods such as filtration or decantation

4. What is the main difference between a mixture and a solution?

• Mixtures are chemically bonded, while solutions are not
• Mixtures can be easily separated, while solutions require complex methods to separate

5. Which of the following is an example of a homogeneous mixture?

• Sand and water
• Saltwater

6. Burning of candle wax is a ________change

• Reversible
• Irreversible

7. Burning of paper is a _______________ change

• Reversible
• Irreversible

8. Rusting of iron is a _______________ change

• Reversible
• Irreversible

9. Melting of ice is a _______________ change

• Reversible
• Irreversible

10. Frying an egg to make an omelette is a _______________ change

• Reversible
• Irreversible