science teacher's guide - DepEd Naga City

Teacher's GuideModule 1: Solutions6. Give one reason why people stir coffee or juice in water after they haveadded sugar.7. Why do you think that it is easier to dissolve powdered brown sugarthan a big whole piece or chunk of brown sugar (the size of a small icecream cup) in water?For items 8-10: A group of students was asked to investigate how fast sugardissolves in cold and in hot water?8. If this is going to be a fair test, what variables should they control?a. Amount of water and sugar in each cup, method of stirring, timewhen the solid is added to water, how long each solution is stirred.b. Amount of water and sugar in each cup, method of stirring, how longeach solution is stirred.c. Amount of sugar in each cup; method of stirring, time when the solidis added to water, how long each solution is stirred.d. Amount of water in each cup, method of stirring, time when the solidis added to water; how long each solution is stirred.9. What is the dependent variable (what is being measured)?I. The temperature of water.II. The amount of sugar.III. The length of time that sugar completely dissolves in hot water.IV. The length of time that sugar completely dissolves in cold water.a. I only c. II and IIIb. II only d. III and IV10. What is the independent variable in the investigation?a. I only c. I, II and IIIb. II and III d. II, III and IVGrade 7 Science: MatterDiversity of Materials in the Environment 14