All questions are ready for submission.
1. What term describes the collected measurements and observations used to support an explanation?A. ConclusionB. GraphC. DataD. Variables
2. What is the proper method for validating a hypothesis?A. By conducting experimentB. By gathering enough information about the problemC. By making inferencesD. By formulating conclusion
3. What describes a consistently observable natural phenomenon under identical conditions, often expressed mathematically or verbally?A. ConclusionB. HypothesisC. TheoryD. Law
4. When Ruben dissolves orange crystals in water with continuous stirring, which observations are most likely to occur?
I. The water becomes orange.
II. The color of the solution becomes darker.
III. Crystals disappear from the bottom of the beaker.
IV. The beaker and its contents become heavier as stirring continues.A. I and II onlyB. III and IV onlyC. I, II, and III onlyD. I, II, and IV only
5. Which statement about the scientific method is FALSE?A. Conclusion is the last stepB. Scientific method may be applied in everyday lifeC. Scientific method is done by following a step-by-step procedure in an exact sequenceD. Scientific method is a systematic way of solving problem
6. Which laboratory equipment should be used to accurately determine the mass of an irregularly shaped solid?A. Erlenmeyer flaskB. Graduated cylinder with waterC. Vernier caliperD. Electronic balance
7. When graphing the relationship between distance traveled and velocity of a car, which variable is dependent and on which axis should it be plotted?A. Distance, x-axisB. Velocity, x-axisC. Velocity, y-axisD. Distance, y-axis
8. A student discovers a piece of metal. What quick test can determine if the metal might contain iron?A. Heat the metalB. Weigh the metalC. Place the metal near a magnetD. Place the metal in water
9. A student submerged strips of aluminum and iron in water, then exposed them to air for one week. What was most likely observed after one week?A. The aluminum strip formed rustB. Both of the metal strips formed rustC. The iron strip formed rustD. Neither of the metals formed rust
10. Which human activity has contributed the most carbon to the atmosphere?A. Burning fossil fuelsB. Mining fossil fuelsC. Increasing soil erosionD. Cutting down the rainforests
11. The table below lists measurement tasks and tools. Which pair correctly matches the measurement task with appropriate laboratory tools?
I. Add 10g of salt to 200 ml of water and stir - Triple-beam balance, 25 ml capacity beaker marked in 1 ml intervals
II. Add 20 ml of rubbing alcohol to 50 ml of water - 250 ml capacity Erlenmeyer flask marked in 50 ml intervals
III. Add 3 ml of cooking oil to 10g of sugar - 5 ml capacity pipette marked in 1 ml intervals, pan balance with masses, petri dish
IV. Add 25 g sugar to 15 ml of water and heat until the sugar dissolves - 100 ml capacity graduated cylinder marked in 25 ml intervals, spring scale, mortarA. IIIB. IC. IID. IV
12. Aubrey wants to monitor her summative test scores throughout the first grading period. Which graphical representation would best help her analyze her progress over time?A. Bar graphB. Line graphC. Pie graphD. Scatter graph
13. What is the most likely consequence if global warming continues unaddressed?A. Lower sea levelsB. Melting of ice capsC. More pollution in waterD. More reflected sunlight off the ice pack
14. What type of relationship exists when both quantities increase, but one quantity increases at a faster rate than the other?A. Direct proportionB. Inverse proportionC. Inverse square proportionD. Direct square proportion
15. To determine which is denser, oil or water, you mixed 25 ml of oil with 25 ml of water. What useful qualitative observation can you make from this setup?A. There are 50 ml of liquid in the containerB. Oil did not mix with waterC. There are 25 ml of water and 25 ml of oil in the containerD. Oil is on top of the water
16. Which of the following is classified as a compound?A. Cemented wallB. GoldC. Dry iceD. Tincture of iodine
17. Which substance is most likely to turn blue litmus paper red?A. Ammonia in waterB. Detergent solutionC. VinegarD. Lime water
18. Which can be classified as homogeneous mixtures?
I. Buko pie
II. Blood
III. Virgin coconut oil
IV. Mango juiceA. III onlyB. I and II onlyC. II, III and IV onlyD. I, III, and IV only
19. Which is a physical property characteristic of non-metals?A. Malleability and ductilityB. High densityC. High tensile strengthD. Low tensile strength
20. The yellow color of a highlighter is a ________ property.A. chemicalB. physicalC. heterogeneousD. homogeneous
21. An odorless and colorless substance boils at 100°C and melts at 0°C. What conclusion can be drawn from these observations?A. It is a metalB. It is a pure substanceC. It is a mixtureD. It is a non-metal
22. Which substance would you use to clean tarnished silver?A. Salt solutionB. Sugar solutionC. VinegarD. Baking soda
23. What would you add to food to extend its shelf life?A. Baking sodaB. VinegarC. Salt solutionD. Tomato
24. Why is it inadvisable to consume soft drinks on an empty stomach?A. It could lessen your appetiteB. It could make you feel full fasterC. It increases the acidity of your stomachD. It contains stimulants which cause dizziness
25. Where is almost all of an atom's mass concentrated?A. electronB. neutronC. protonD. nucleus
26. How many protons does an atom contain if it has a mass number of 23 and an atomic number of 11?A. 12B. 11C. 23D. 44
27. A Carbon-12 atom contains ______________.A. 6 electrons, 12 protons, 6 neutronsB. 6 electrons, 6 protons, 6 neutronsC. 12 electrons, 6 protons, 6 neutronsD. 16 electrons, 6 protons, 6 neutrons
28. What happens to an element's atomic number during a chemical reaction?A. Remains the sameB. ChangesC. Changes alternatelyD. Changes and then is restored
29. Which statement about hydrogen isotopes is correct?A. They have the same number of protonsB. They have different atomic numbersC. They have the same number of neutronsD. They have different numbers of electrons
30. Which of the following species has 16 electrons?A. ₁₃Al³⁺ with mass number 27B. ₁₇Cl⁻ with mass number 35C. ₁₆S with mass number 32D. ₁₆S²⁻ with mass number 32
