Division of Misamis Occidental
Aloran Southwest District
TAGUANAO INTEGRATED SCHOOL- 501879
FIRST PERIODICAL EXAMINATION- SCIENCE 7
SY. 2022-2023
Name:
Grade Level:
Subject:
Teacher:
Score:
Date:
I. Direction: Read the questions carefully and choose the letter of the best answer. Encircle the
letter of the correct answer.
1. What do you call a series of logical steps that is followed in order to solve a problem?
A. Model method
B. Scientific theory
C. Scientific method
D. Experimental process
2. What skill is involved when you use fine senses to gather information?
A. Observing
C. Developing hypothesis
B. Posing questions
D. Designing experiments
3. Which step that follows formulating and objectively testing hypotheses?
A. Interpreting results
C. Conducting experiments
B. Stating conclusions
D. Making observations and collecting data
4. What skill is used by a scientist when he/she listens to the sounds that are produced by whales?
A. Interpreting data
C. Making a hypothesis
B. Drawing conclusions
D. Making observations
5. What is the correct order of the steps in the scientific method?
A. Ask a question, analyze results, make a hypothesis, test the hypothesis, draw conclusions,
communicate results.
B. Ask questions, make a hypothesis, test the hypothesis, analyze results, draw conclusions,
communicate results.
C. Ask a question, make a hypothesis, test hypothesis, draw conclusions, analyze results,
communicate results.
D. Make a hypothesis, test the hypothesis, analyze the results, ask a question, draw conclusions,
communicate results.
6. Which of the following hypotheses is written correctly?
A. If frozen tennis balls will not bounce as high.
B. If I heat up a tennis ball it will bounce high.
C. If I freeze a tennis ball, then it will not bounce as high.
D. If a tennis ball is frozen, it will not bounce as high as one that is not frozen.
7. 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. Which is the independent variable?
A. Water
C. Amount of salt in the water
B. Temperature of the water
D. Number of plants in the water
8. 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
C. Amount of salt in the water
B. Temperature of the water
D. Number of plants in the water
9. Why is Scientific Method an important process in doing experiments?
A. It takes more work but it is worth it.
B. It helps the experiment to take longer and be better.
C. It ensures that the results can be trusted and repeated.
D. It ensures that the people doing the experiments are scientific.
10. How do scientists test their hypothesis?
A. Designing models
B. Doing experiments
C. Drawing conclusions
D. Formulating questions
11. It can be separated through chemical means.
A. Compound
B. Element
C. Mixture
D. Substance
12. Which of the following is NOT an element?
A. Calcium
C. Oxygen
B. Iron
D. Sugar
13. Oxygen and iron are elements (I). Protein and sugar are elements too (II).
A. Both statements I and II are TRUE.
B. Both statements I and II are FALSE.
C. Statement I is FALSE while statement II is TRUE.
D. Statement I is TRUE while statement II is FALSE.
14. Danica was assigned by her teacher to match compound with its constituent elements. Which do
you think of her matched pair are correct?
I.
II.
III.
IV.
Calcium Chloride : Calcium, Chlorine
Water : Nitrogen, Oxygen
Carbon Dioxide; Carbon, Oxygen
Salt : Sodium, Magnesium
A. I and II only
B. I and III only
C. II and III only
D. I and IV only
15. How do you classify elements from compounds?
A. Elements are single atom substances.
B. Compounds are composed of one molecule.
C. Compounds are composed of two or more molecules.
D. Compounds are composed of two or more compounds.
16. Joshua planned to have an experiment. He prepared the materials namely sodium chloride, hydrogen
peroxide, iron, and iodine. Which of his materials are compounds?
I. Sodium chloride
II. Hydrogen peroxide
III. Iron
A. I and II only
B. I and III only
IV. Iodine
C. II and III only
D. II and IV only
17. When hydrogen is combined with oxygen what is produced?
A. Hydrocarbon
C. Oxide
B. Hydrochloride
D. Water
18. Which of the following is NOT correctly matched?
A. Salt: Na and Cl : Element
B. Water: H and O: Compound
C. Carbon dioxide: C and O: Compound
D. Magnesium chloride: Mg and Cl: Compound
For items 19—20 refer to the problem below.
Substance A and Substance B were examined. The results showed that Substance A is made
up of a single atom and cannot be broken down into simple form while Substance B is made up of
two or more atoms of different kinds and can be broken down into its components.
19. Which of the following is substance B?
A. Compound
B. Element
20. Which of the following is substance A?
A. Acid
B. Element
C. Mixtures
D. Pure Substance
C. Compound
D. Mixture
21.Which of the following is a property of mixture?
A. It has a definite composition.
B. It consists of a single phase.
C. It has a heterogeneous composition.
D. It can be chemically separated into its components.
22.Which is NOT a technique to separate components of mixture?
A. Condensation
C. Evaporation
B. Distillation
D. Filtration
23. What is the difference between a substance and a mixture?
A. Substance can be separated while mixture cannot be separated.
B. Substance has many components while mixture has one only.
C. Substance is heterogeneous while mixture is homogeneous.
D. Substance is pure while mixture is impure.
24. Which of the following is a heterogeneous mixture?
A. Air
C. Stainless steel
B. Oil in water
D. Softdrinks
25. Ella is experimenting on how two liquid samples. The data he gathered is shown in the table
below.
Temperature in ˚C
Before
heating
After 5
minutes
After 8
minutes
After 10
minutes
After 12
minutes
After 14
minutes
After 16
minutes
Liquid A
29
45
60
90
100
100
100
Liquid B
30
47
65
97
100
105
108
SAMPLES
What can be inferred from the table?
A. Liquid A is pure substance while Liquid B is a mixture.
B. Liquid A is a mixture while Liquid B is a pure substance.
C. Liquid A is an element while Liquid B is a substance.
D. Both Liquids A and B are pure substance.
26. Which of the following materials will be used to separate a mixture of iron nails and sand?
A. Alcohol Lamp
C. Magnet
B. Filter paper
D. Spoon
27. What is/are true for substance and mixture?
I. Pure substance melts completely.
II. Pure substance has a varying boiling point.
III. Mixture does not melt completely.
IV. IV. Mixture has a fixed boiling point.
A. I and II only
C. II and IV only
B. I and III only
D. I and IV only
28. Which of the following will Jeoffrey do to segregate the rubber bands of different colors?
A. Decantation
C. Filtration
B. Evaporation
D.Physical Manipulation
29. A white powder was tested and heated. After some time, it melts completely. What does it imply?
A. It is a mixture.
B. It is a pure substance.
C. It is a homogeneous mixture.
D. It is a combination of pure substance and mixture.
30. What does it indicate when a sugar is heated in a test tube until it is completely changed into a
black mass and droplets of water?
A. Compound
C. Mixture
B. Element
D. Solution
31. You are given a 40 mL solution in a beaker. You add solute to the beaker and you observed
some particles did not dissolve. What solutions is it?
A. Saturated
C. Concentrated
B. Unsaturated
D. Supersaturated
32. What do you call a substance that dissolved in another substance which is in greater amount?
A. Solute
C. Solute and Solvent
B. Solvent
D. Neither Solute nor Solvent
33. What do you call a substance dissolved in any solution?
A. Solute
C. Solute and Solvent
B. Solvent
D. Neither Solute nor Solvent
34. How will you prepare an unsaturated solution?
A. Freeze the mixture
B. Stir the powder in the liquid
C. Add less amount of powder to the liquid
D. Add more amount of solute in a lower amount of solvent.
35. Which of these factors will cause more sugar to dissolve in a saturated sugar solution?
I. Add more sugar while stirring
II. Add more sugar and heat the solution
III. Add more sugar to the heated solution
IV. Add more sugar and cool down the solution
A. I, II, III only
C. II and III only
B. I and II only
D. I, III, IV only
36. Why increasing temperature of the solvent will speed up the dissolving process? because it
brings____________.
A. more solute to crystallize
B. less solute molecules to the solvent
C. fresh solvent into contact with more solute
D. more solvent molecules to collide with the solute
37. When
A.
B.
C.
D.
does a solution become saturated?
Crystals form
You need to stir it more
No additional material will dissolve in it
Two materials have combined to create a clear liquid
38. Which of the following describes a solvent?
A. It’s a metal molecule
B. Another word for solution
C.
A thing that makes drinks turns colors
C. The liquid in which a solute is dissolved to form a solution
39.
40.
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
A saturated solution is made by dissolving 36.8g of a solid in 200mL of water. A second
solution is made by dissolving 19.1 g of the same solid in 100mL of water. How the solution
would be classified?
A. Unsaturated
C. Supersaturated
B. Saturated
D. Hyper saturated
41. How many grams of glucose are needed to prepare 400mL of 5% glucose solution?
A. 5g
C. 14g
B. 10g
D. 20g
42.
What is the percentage concentration in the following solution given 2g sucrose in 80g water?
A. 2.4%
C. 4.0%
B. 2.5%
D. 97.6%
43. Sterling silver contains 95% silver. If a necklace made of sterling silver weighs 15g, what is the
mass of the silver dissolved in the necklace?
A. 1.6g
C. 9.0g
B. 6.2g
D. 14.25g
44.
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%
C. 22.47%
B. 22.21%
D. 22.74%
45. Brass is a copper- zinc alloy. If the concentration of zinc is relatively low, the brass has a golden
color and is often used for inexpensive jewelry. If a 35.0g pendant contains 1.7g of zinc, what is
the % by mass of zinc in brass?
A. 4.7%
C. 4.9%
B. 4.8%
D. 10%
46. A solution of benzene and toluene was prepared by adding toluene to benzene until the total
volume becomes 135mL. By volume, the solution is 30.0% benzene. How much benzene, in
mL, is in the solution?
A. 39.5mL of benzene
C. 41.5mL of benzene
B. 40.5mL of benzene
D. 42.5mL of benzene
47. 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%
48. What is the volume of a 25% methyl solution that contains 20mL of methyl?
A. 6.25mL
C. 8.25mL
B. 7.25mL
D. 9.25mL
49. You bought an 18 karats ring which contains 18g of gold. What is the % by mass of gold in a
ring?
A. 65%
C. 85%
B. 75%
D. 95%
50. What is the % M/M if 10.0g of copper is added to enough zinc to produce 110g of an alloy?
A. 9.05%
C. 9.10%
B. 9.09%
D. 10.00%