Republic of the Philippines

Department of Education
Region I
SCHOOLS DIVISION PANGASINAN II
SAN LUIS NATIONAL HIGH SCHOOL
Rosales, Pangasinan

FIRST PERIODICAL EXAM IN SCIENCE 7

SY: 2022 – 2023
Name: ___________________________________ Grade/ Section: _______________ Score: __________
1. In a scientific investigation, which is the tentative answer to the problem?
A. conclusion B. data C. experiment D.
hypothesis
2. The mother of Aaron wanted to find out the effect of organic fertilizer in the growth of pechay
plant. What are the steps she needs to follow in order to find out the effect of fertilizer on the
plant’s growth?
A. conduct an experiment, form a hypothesis, make a conclusion, record data , ask a
question
B. observe, ask a question, form a hypothesis, conduct an experiment, record data, make
a conclusion
C. form a hypothesis, conduct an experiment, record data, make a conclusion, ask a
question
D. record data, form a hypothesis, make a conclusion, conduct an experiment , observe,
ask a question
3. The scientific investigation begins with ________.
A. sharing findings to others
B. asking the opinion of others
C. an observation of events around us
D. digging of information over the internet
4. During an experiment about a coin and feather that were dropped at the same time, it was
found that the coin reached the ground first. One student said: “Maybe, the coin is heavier than
the feather.” What do you call this kind of statement?
A. a problem B. a hypothesis C. an interpretation D. conclusion
5. Vincent saw bats catching insects after dark. He asked, “How do bats find the insects in the
dark?” What does this statement signify?
A. Observation B. Experiment C. conclusion D. question
6. What do you call the information collected during an experiment?
A. data B. observation C. hypothesis D. variable
For questions 7-9, refer to the information below
During the bread and pastry class of Russel, he watched closely as her teacher demonstrated how to prepare
bibingnka or rice cake. She noticed that her teacher added yeast. She asked her teacher, “Teacher Ana what is the
use of yeast?” Teacher Ana replied, “The yeast will make the bibingka rise. It will release gas as it is feed on
sugar.” Russel wonders if the amount of sugar will affect the size of the bibingka.

7. What would be Russel’s statement of the problem?

A. Does yeast affects the taste of bibingla?
B. Does sugar affects the taste of bibingka?
C. How does sugar affects the size of bibingka?
D. How does flour and butter affects the size of bibingka?
8. Which of the following statement would be the hypothesis Russel?
A. Does sugar affects the size of bread?
B. More sugar made the bread rise higher.
C. If more sugar is added, then the bread will rise higher.
D. John finds that 70g. of sugar produces the largest bibingka.
9. At the end of the experiment, Russel stated that the larger the amount of sugar added then
the bibingka becomes bigger. What does this statement signify?
A. An observation B. A hypothesis C. A conclusion D. A
question
10. Celso read about growing plants in water. He wanted to determine how plants could grow
without soil. What step of scientific method is being described?
 A. Observation B. Experiment C. hypothesis
D. Conclusion
11. Which one of the following statements is correct?
A. Water is an element and nitrogen is a compound.
B. Water is a compound and nitrogen is an element.
C. Water and nitrogen are both compounds.
D. Water and nitrogen are both elements.
12. Which of the following makes compounds different from elements?
A. Compounds are made up of molecules.
B. Compound may be a solid, liquid, or gas.
C. Compound have properties which make them useful to people.
D. The molecules of a compound are composed of two or more kinds of atoms.
13. Which element can be found as charcoal or diamond?
A. carbon B. hydrogen C. oxygen D. zinc
14. Calcium is the main component of our bones and teeth. Which is the correct symbol for this
element?
A. C B. Cl C. Ca D. Cu
15. Some accessories are made up of silver. Which is the correct symbol for this element?
A. Au B. Ag C. G D. Go
16. When a substance is analyzed using an electron microscope, it is found to contain only one
type of atom. This substance is ______.
A. an element B. a molecule C. a mixture D. a compound
17. A compound is represented by a chemical formula while an element is represented by
a________.
A. coefficient B. chemical symbol C. subscript D. chemical formula
18. What is the correct order of chemical symbols of the following element; chlorine, potassium,
copper, sodium?
A. Cl, P, Co, So B. Cl, K, Co, So C. Cl, K, Cu, Na D. C,P,C,S
19. Study the four diagrams representing different substances. Which two of these diagrams
represents elements?

20. Which of the following can be separated into simpler form only by chemical means?
A. hydrogen B. sodium C. gold D. water
21. What are the two (2) classes of matter?
A. Atom and molecule C. Plant and animal cells
B. Element and compound D. Substance and mixture
22.Which of the following is a physical appearance of a substance?
A. Complicated B. Homogeneous C. Heterogeneous D. Non-uniform
23.Which of the following is a heterogeneous mixture?
A. Air B. Stainless steel C. Oil in water D. Soft drink
24.What substance is made by mixing two elements without being chemically combined?
A. Compound B. Element C. Mixture D. Solution
25.Which of the following is a heterogeneous mixture?
A. Air B. Oil in water C. Stainless steel D. Soft drink
26. It was observed that a burning chemical produced a black flame and left ashes. What type of
substance is this chemical?
A. mixture. B. organic C. inorganic. D. acid.
27.Which of the following statements distinguishes pure substances from mixtures?
A. Can be separated by physical means.
B. Consists of two or more kinds of matter.
C. Have no specific solubility and densities.
D. Have constant boiling temperature and melting temperature.
28.Ethan wants to separate the marbles in a jar full of water. Which of the following is the BEST
way to separate the mixture?
A. Decantation B. Dissolving C. Evaporation D. Using a magnet
29.What is the BEST way to use in separating iron fillings from a mixture?
A. Filter paper B. Magnet C. Water D. Spoon
30.Which of the following uses evaporation as a means of separating the components of the
given mixture?
A. Oil and water C. Sand and gravel
B. Pebbles and sand D. Salt and water
31. In a salt water solution, what substance is considered the solvent?
A. Salt C. Both are solvents
B. Water D. Neither substance is a solvent
32. Which of the following is a supersaturated solution?
A. One cup of NaCl in one cup of water.
B. One teaspoon of NaCl in one cup of water.
C. A small pinch of NaCl in one cup of water.
D. One tablespoon of NaCl in one cup of water.
33. Why is a solution considered a homogeneous mixture?
A. It is usually liquid. C. It contains a solute and solvent.
B. It can be dilute or concentrated. D. Its component are distributed evenly.
34. All of the following describes a solution EXCEPT_____.
A. Clear C. Cannot pass through filter paper
B. Homogeneous D. Can be separated by physical means
35. Which of the following refers to the solution that contains the maximum amount of solute
dissolved by a given amount of solvent?
A. Solubility C. Unsaturated solutions
B. Saturated solutions D. Supersaturated solutions
36. Which of the following refers to the solution that contains less amount of solute than can
dissolve by a given amount solvent?
A. Solubility C. Unsaturated solutions
B. Saturated solutions D. Supersaturated solutions
37. What is the solution that contains more solute than a saturated solution under the same
conditions?
A. Solubility C. Unsaturated solutions
B. Saturated solutions D. Supersaturated solutions
38. To make a solute dissolve more quickly in a solvent which of the following will you do?
A. Stir it in cold water. C. Let the solute settle down.
B. Stir it in warm water. D. Nothing to do with the solute.
39. Alfred accidentally added more amount of sugar in a cup of hot milk. What will he most likely
to do?
A. Add water C. Mix the milk solution well
B. Add sugar D. Put it in the refrigerator for an hour
40. How does the solubility of a solid change when the temperature of the liquid solvent is
increased?
A. The solubility increases. C. There is no change in the solubility.
B. The solubility decreases. D. The change in the solubility is unpredictable.

41. 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%
42. What is the volume of a 25% methyl solution that contains 29 mL of methyl?
A. 6.25 mL B. 7.25 mL C. 8.25 mL D. 9.25 mL
43. How many grams of glucose are needed to prepare 400 mL of 5% glucose solution?
A. 5g B. 10g C. 14g D. 20g
44. What is the percentage concentration in the following solution given 2g sucrose in 80g
water?
A. 2.4% B. 2.5% C. 4.0% D. 97.6%
45. What is the percent by mass concentration of a solution that contains 6.0g of sugar dissolved
in 20.7 g of water?
A. 21.21% B. 22.21% C. 22.47% D. 22.74%
46. A saline solution is a salt and water mixture that is safe for our body. What is the %
concentration of NaCl (salt) present in this fluid solution?
The standard ration is 9 grams NaCl for every 1000 g of water.
A. 0.09% B. 0.9% C. 9.0% D. 90%
47. Mouthwashes are used to kill the bacteria in our mouth. Find the % by volume of alcohol
in a 160 mL mouthwash solution if the amount of alcohol is 40 mL.
A. 0.250% B. 2.50% C. 25.0% D. 250.0%
48. Most of the liquid solutions we buy in the supermarket is expressed in % concentration.
Which of these best explains the use of % by volume of a solution (v/v)?
A. When the given solute and solvent are both solids.
B. When the given solute and solvent are both liquids
C. When the given solute is liquid, and solvent is solid
D. All of these explains the use % by volume as long as its homogeneous
49. What is the percent by mass of a solution made by dissolving 10.0 g of NaCl into 180.0 g of
water?
A. 5.26% B. 5.56% C. 180.0% D. 20.0%
50. What is the percent by mass of a solution containing 56.5 g of salt in 500 g of water?
A. 11.3% B. 5.56% C. 8.85% D. 10.2%