Chapter 2: Matter

2. Which of the following is NOT a physical change?

3. Ibrahim mixes salt and sand together. He can still see individual grains of salt and sand, and he can separate them using a magnet and water. What type of substance is this mixture?

4. Nora is learning about the effect of temperature on gas solubility. She opens a cold soda can and it is more fizzy than a warm one. What is the relationship between gas solubility and temperature?

5. Waseem mixes sand and water in a glass. He notices that the sand particles are large and settle to the bottom after some time. This mixture is an example of:

6. Ming is preparing a concentrated solution of sodium chloride. He adds more solute to the solvent. How does the concentration of the solution change?

7. A chemical property is observed when a substance:

8. Uma is studying the solubility of sugar in water. She finds that at 20°C, she can dissolve 200 g of sugar in 100 g of water. If she tries to dissolve 250 g in 100 g of water at 20°C, what will happen?

9. Tina is making a solution by dissolving oxygen gas in water. She knows this is important for aquatic life. What type of solution is this based on the solvent and solute states?

10. A supersaturated solution is:

11. Ahmed has a glass of water at room temperature. He puts it in the freezer, and after a few hours, it becomes ice. He is curious about the change in the arrangement of particles. Based on the states of matter, what change occurred?

12. Patricia is making a solution of salt in water. She keeps adding salt until no more salt will dissolve and some salt remains at the bottom. What type of solution does Patricia have?

13. Rachel is making a mixture of flour and water. The mixture is cloudy and particles do not settle quickly. She knows this is not a true solution. What is this mixture classified as?

14. Liquids have:

15. Which of the following is an example of a colloid?

16. Density is defined as:

17. Xia is studying a substance that has properties of both a liquid and a solid. It flows like a liquid but has some ordered structure like a solid. She is studying this for her project on modern displays. What is this state called?

18. A saturated solution contains:

19. Khalid is learning about the different forms of carbon. He knows that diamond is hard and transparent, while graphite is soft and opaque. These are different forms of the same element. What are these forms called?

20. Which of the following is a mixture?

21. Which of the following is an intensive property?

22. Xia is making a solution of iodine in alcohol (tincture of iodine). She knows that iodine is the solute and alcohol is the solvent. What type of solution is this based on the states of solute and solvent?

23. Victor is looking at a mixture of two metals, copper and tin, to make bronze. The mixture is uniform and is considered a solution. What type of solution is bronze?

24. Khalid is looking at a piece of graphite. He knows that graphite is soft and can be used as a lubricant. Which property of graphite makes it soft and slippery?

25. An unsaturated solution contains:

26. Allotropes are different forms of:

27. Emma is studying the density of an unknown liquid. She measures its mass and volume and finds that its density is 0.8 g/cm³. She compares it to water (1.0 g/cm³). Will this liquid float on water?

28. George is learning about the compressibility of states of matter. He knows that gases are highly compressible, liquids are almost incompressible, and solids are incompressible. Which state of matter has particles that are closest together?

29. Tina has a solution of potassium permanganate in water. The solution is purple and uniform. If she adds more water, the solution becomes lighter. What is happening to the concentration?

30. Quinn is studying the properties of diamond. He knows diamond is the hardest natural material. Which property of diamond contributes to its hardness?