Read each item carefully and choose the best answer.

1. What is the correct order of steps in the scientific method?
a. Ask a question, make a hypothesis, test the hypothesis, draw conclusions, and analyze results.
b. Ask a question, make a hypothesis, test the hypothesis, analyze results, and draw conclusions.
c. Ask a question, analyze results, make a hypothesis, test the hypothesis, and draw conclusions.
d. Make a hypothesis, test the hypothesis, analyze results, ask a question, and draw conclusions.

2. What skill is used by a scientist when they listen to the sounds that are produced by whales?
a. interpreting data
b. drawing conclusions
c. making a hypothesis
d. making observations

3. A scientist hypothesizes that the temperature at which a bird’s egg is incubated will determine whether the bird will be male or Female scientist . What is the independent variable of this experiment?
a. incubator
b. temperature
c. gender of the ostrich

4. A scientist conducted an experiment to determine how the amount of salt
in a body of water affects the number of plants that can live in the water. In
this experiment, which is the dependent variable?
a. water
b. temperature of the water
c. amount of salt in the water
d. number of plants in the water

5. Which of the following steps to solve a problem must be completed last?
a. analyzing data
b. drawing conclusions
c. testing a hypothesis
d. recognizing and identifying the problem

6. Sodium chloride dissolves in water very well. Which is NOT TRUE in the
following statements?
a. Water is a pure substance.
b. Sodium chloride is a pure substance.
c. Dissolving sodium chloride with water produces a mixture.
d. Dissolving sodium chloride with water produces a new substance.

7. Which of the following materials will be used to separate a mixture of iron
nails and sand?
a. alcohol Lamp
b. filter paper
c. magnet
d. spoon

8. Two liquids were observed and heated. The data gathered is shown in the
table below. Based on the table, which of the following is TRUE about Liquid
a. It has a fixed boiling point.
b. It is heterogeneous.
c. It is a mixture.
d. It is an element.

9. You are given a 40 mL solution in a beaker. You add solute to the beaker
and you observe some particles do not dissolve. What solution is it?
a. saturated
b. unsaturated
c. concentrated
d. supersaturated

10. What type of a mixture is a solution?
a. Heterogeneous
b. Homogeneous
c. Immiscible
d. Miscible

11. A powder is about to be poured into the liquid. Which of the following
should be done to make this powder dissolve faster?
a. Freeze the mixture
b. Stir the powder in the liquid
c. Add more powder to the liquid
d. Store the mixture in a dark place

12. How does the solubility of a solid change when the temperature of the
liquid solvent is increased?
a. The solubility increases.
b. The solubility decreases.
c. There is no change in the solubility.
d. The change in the solubility is unpredictable.

13. How many grams of glucose are needed to prepare 400mL of 5% glucose solution?
a. 5g
b. 10g
c. 14g
d. 20g

14. What is the percent by mass concentration of a solution that contains
6.0g of sugar dissolved in 20.7g of water?
a. 21.21%
b. 22.21%
c. 22.47%
d. 22.74%

15. Which of the following refers to the solution that contains less amount of
solute than can dissolve at a given temperature?
a. solubility
b. saturated solution
c. unsaturated solution
d. supersaturated solution

16. A solution is prepared by mixing a 20g of sodium chloride in 80g of water.
What are the concentrations of the solute and solvent in % by mass?
a. solute: 10% ; solvent: 90%
b. solute: 20% ; solvent: 80%
c. solute: 30% ; solvent: 70%
d. solute: 40% ; solvent: 60%

17. Which of the following CANNOT be broken down into simple substance?
a. chemical formula
b. compound
c. element
d. mixture

18. Which of the following ingredients is a compound?
a. calcium
b. calcium chloride
c. magnesium
d. manganese

19. How would you describe elements and compounds?
a. Elements and compounds are composed of one substance.
b. Elements and compounds are composed two or more substances.
c. Elements and compounds can be broken down into complex forms.
d. Elements and compounds cannot be broken down into simpler forms using ordinary means.

20. Boron, carbon, nitrogen, and oxygen are examples of _______________.
a. compounds
b. elements
c. ingredients
d. nutrition facts

Pa-brainlest ko makatama para perfect ako sa test namin sa Science 7​