Making and separating solutions

9.A student adds copper sulfate crystals to water and stirs. After some time, the crystals disappear. Which statement is correct?

10.A mixture of salt, sand, and water is stirred and then filtered. What remains on the filter paper?

11.Which of the following statements about solutions is correct?

12.To obtain copper sulfate crystals from a copper sulfate solution, the solution is heated gently in an evaporating basin. Why is the solution removed from heat before all the water has evaporated?

13.A student adds 10 g of salt to 100 cm³ of water at 20°C and stirs. After 5 minutes, all the salt has dissolved. The student repeats the experiment with 100 cm³ of water at 60°C. Which statement about the second experiment is correct?

14.A mixture contains salt, sand, and water. The mixture is stirred and then filtered. The filtrate is collected and then heated gently in an evaporating basin until some water has evaporated. What is the final residue in the evaporating basin?

15.The diagram shows an experiment to obtain copper sulfate crystals from a copper sulfate solution. The solution is heated gently in an evaporating basin. Why is the solution removed from heat before all the water has evaporated?

16.Which of the following is the solute in a solution made by dissolving oxygen gas in water?

17.A student has a mixture of iron filings and sand. Which method should be used to separate them?

18.A student adds 5 g of sugar to 50 cm³ of water at 25°C and stirs. After 2 minutes, undissolved sugar remains at the bottom. Which change would cause all the sugar to dissolve in less than 2 minutes?

19.Which of the following is insoluble in water?

20.A student filters a mixture of sand and water. What passes through the filter paper?

21.A solution contains 20 g of salt dissolved in 100 g of water. The solution is heated until 50 g of water has evaporated. Assuming no salt is lost, what mass of salt crystals will be obtained?

22.In a solution of sugar in water, what is the solvent?

23.A student wants to obtain salt crystals from a salt solution. Which piece of apparatus is essential for this process?

24.A mixture of salt, sand, and water is stirred and then filtered. The filtrate is collected and then heated gently in an evaporating basin until some water has evaporated. What remains on the filter paper?

25.A student wants to obtain copper sulfate crystals from a copper sulfate solution. Which of the following is the correct sequence of steps?

26.A student has a mixture of sand and water. Which method should be used to separate them?

27.In a fizzy drink, carbon dioxide is dissolved in water. What is the solute?

28.A student adds 10 g of salt to 100 cm³ of water at 20°C and stirs. After 5 minutes, all the salt has dissolved. The student repeats the experiment with 100 cm³ of water at 50°C and adds salt until no more dissolves. Which statement is correct?

29.A mixture contains salt, sand, and water. The mixture is stirred and then filtered. The filtrate is collected and then heated gently in an evaporating basin until some water has evaporated. Which substances are obtained after filtration and after evaporation?

30.A solution contains 20 g of salt dissolved in 100 g of water. The solution is heated until 50 g of water has evaporated. Assuming no salt is lost, what mass of salt remains in the solution?

31.Which of the following best defines the term 'solute'?

32.Which of the following best defines the term 'solvent'?

33.Which of the following best defines the term 'solution'?

34.Which of the following statements is true?

35.Can you filter out salt from a saltwater solution using filter paper?

36.In a fizzy drink, carbon dioxide is dissolved in water. What is the solvent?

37.Which of the following methods is used to separate sand from a mixture of sand and water?

38.To obtain sugar crystals from a sugar solution, which method is used?

39.A student adds 10 g of salt to 100 cm³ of water at 20°C and stirs. After 5 minutes, all the salt has dissolved. The student repeats the experiment with 100 cm³ of water at 50°C. Which statement best describes what happens?

40.A mixture contains salt, sand, and water. The mixture is stirred and then filtered. What is collected as the filtrate?

41.Sand is soluble in water.

42.Salt is soluble in water.

43.Sugar dissolves faster in hot water than it does in cold water.

44.You can filter out the salt from a saltwater solution by passing the solution through filter paper.

45.Which of the following is the solute in a solution of salt water?

46.Which method is used to obtain copper sulfate crystals from a copper sulfate solution?

47.Match each term on the left with its correct description on the right.

48.Arrange the following steps in the correct order to obtain copper sulfate crystals from a copper sulfate solution.

49.Sugar dissolves faster in cold water than in hot water.

50.A student has a mixture of salt and sand. She adds water and stirs, then filters the mixture. Which substance remains on the filter paper?

51.Complete the sentence: In a fizzy drink, the solute is ___ and the solvent is ___.

52.Describe what the word soluble means.

53.Describe what the word insoluble means.

54.State two ways of making salt dissolve faster in water.

55.Complete the sentences using the words from the list: solute, solvent, solution, soluble, insoluble.

56.Describe how you would separate sand from a sand and water mixture.

57.Describe how you would separate sugar from a sugar and water solution.