please sagutin nyo po ito ipapasa namin kay maam ito. sana po tulungan nyo po ako wala po akong grades kapag hindi ko to ipapasa ngayon i hope na tulungan nyo ako bibigyan ko kayo ng 100 points kapag sinagutan nyo to maraming salamat


1. 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, time when 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 long each solution is stirred.
c. Amount of sugar in each cup; method of stirring, time when the solid is added to water, how long each solution is stirred.
d. Amount of water in each cup, method of stirring, time when the solid is added to water; how long each solution is stirred.
2. 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 b. II and III c. II only d. III and IV
3. What is the independent variable in the investigation?
a. I only b. I, II and III c. II and III d. II, III and IV
4. Scientists use the scientific method to find the answer to a certain question. When planning a scientific investigation, what is the first thing scientists do?
a. Conduct the experiment
b. Plan the experiment
c. State the hypothesis
d. Research the problem
5. . Which of the following is NOT TRUE about scientific method?
a. Experimentation is used to test the hypothesis.
b. Observation is the first step in scientific method.
c. Hypothesis is the possible answer to the problem.
d. Results must be kept to self
6. The chemical system with two phases of matter is ______________________
a. salt solution b. glass of iced water c. carbonated drinks d.oil and water


7. The table shows data from an investigation designed to find a liquid solution that is both an acid and a strong electrolyte. Based on the data, a solution that is both an acid and a strong electrolyte is_____
a. Solution 1 b. Solution 2 c. Solution 3 d. Solution 4
8. Which of the following statements concerning factors that affect solute solubility is incorrect?
a. Most solid solutes become more soluble in water with increasing temperature.
b. Most solid solutes become less soluble in water with decreasing pressure.
c. Gaseous solutes become less soluble in water with increasing temperature.
d. Gaseous solutes become more soluble in water with increasing pressure
9. A saline solution is made up of sodium chloride and water. What do you call water in this solution?
a. solute b. solvent c. saturated solute d. saturated solvent

10. Rubbing alcohol is composed of ethyl alcohol and water. What do you call ethyl alcohol in this solution?
a. solute b. solvent c. saturated solute d. saturated solvent


11. Stainless steel is a combination of carbon and iron. What is the solution phase of this mixture?
a. gas b. liquid c. solid d. plasma

12. Which statement describes the solute?
a. It is the solid formed in solution. b. It is the liquid part of the solution.
c. It is the component of a solution in smaller amount. d. It is the component of a solution in bigger amount.



13. . In which step is the solution described as saturated solution
a. 1 b. 5 c. 6 d. 7

14. Ten grams of white sugar is dissolved in 100 mL of water. All of the sugar is dissolved in the water. Which of the following best describes the resulting solution?
a. saturated b. supersaturated c. unsaturated d. undersaturated

15. What will happen if a solution has a larger concentration than other solution?
a. float above the less concentrated solution
b. mix with the less concentrated solution
c. sink below the less concentrated solution
d. all of the above
16. Which of the following factors will NOT make the dissolution of a solid solute in water faster?
a. addition of more water b. heating of the mixture
c. making the temperature colder d. stirring of the mixture

17. Which of the following factors explains why oil is immiscible in water?
a. There is not enough water to dissolve the oil b. The atmospheric pressure is not enough to make the mixing possible
c. The nature of water is different from that of the oil d. There should be stirring to make it possible for both to mix

18. How can you say that a solution is considered diluted?
a. Dark in color
b. Have a strong scent
c. Have a large amount of solute
d. Have a small amount of solute in a solution
19. How do you increase the concentration of a solution?
a. add more powder or solute
b.add more water
c.less powder or solute
d. less water or solvent