(Term 1) 2nd Summative Test in Science 7

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Scientific Investigations, Basic Measurements, Solutions (part 1 only: identify solute and solvent, factors affecting solubility), and Proper use and handling of science equipment

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MERY ROSE SANTIAGO

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(Term 1) 2nd Summative Test in Science 7


(Term 1) 2nd Summative Test in Science 7Versión en línea Scientific Investigations, Basic Measurements, Solutions (part 1 only: identify solute and solvent, factors affecting solubility), and Proper use and handling of science equipment por MERY ROSE SANTIAGO 1 1. In conducting a scientific investigation, what is typically the very first essential step that a researcher must do? a C. Setting up all the lab equipment b B. Drawing a final valid conclusion c A. Analyzing the gathered data carefully d D. Stating the main aim or problem 2 2. Which part of a scientific investigation contains the detailed, step-by-step procedures used to conduct the experiment? a D. Results b C. Method c A. Aim d B. Conclusion 3 3. You notice that your phone9s battery drains extremely fast. You think that reducing the screen brightness will make it last longer. In the scientific method, what does your thought represent? a B. Data b A. Conclusion c C. Hypothesis d D. Problem 4 4. A student observed and recorded the height of a mung bean plant for seven consecutive days. Which part of the scientific investigation do these recorded measurements belong to? a B. Conclusion b C. Method c D. Results d A. Aim 5 5. A scientist wants to find out if a new organic fertilizer increases plant height. She applies it to Plant A and gives zero fertilizer to Plant B. What is the specific role of Plant B in this experiment? a A. It acts as the normal control setup for a fair comparison. b B. It acts as the main variable of the scientific experiment. c C. It provides the initial main problem of the overall study. d D. It serves as the final conclusion for the research thesis. 6 6. After testing, you found that salt dissolves significantly faster in hot water than in cold water. Based on your results, what is your scientific conclusion? a A. Cold water makes the salt dissolve instantly. b C. Increasing temperature speeds up the process. c D. Salt particles disappear permanently in water. d B. Heat has no effect on the dissolving process. 7 7. A student claims, "My experiment is a total failure because my final results did not match my initial hypothesis." Is this statement scientifically sound? a C. Yes, because a very good experiment must always prove the claim. b A. No, because unexpected results still provide valid scientific data. c D. Yes, because completely mismatched data means the tool is broken. d B. No, because the hypothesis should simply be changed to match it. 8 8. Which of the following is considered the standard metric unit for measuring the mass of a solid chemical in the laboratory? a D. Milliliter b A. Centimeter c B. Gram d C. Liter 9 9. A digital timer reads exactly 01:50 during an experiment. What does this measurement accurately represent in total seconds? a C. 90 b B. 70 c A. 50 d D. 110 10 10. If a student reads a laboratory thermometer and it points exactly to 370C, what does this indicate in a human body context? a B. The temperature is exactly at the normal human body level. b D. The temperature is at the freezing point of pure tap water. c A. The temperature is extremely below the normal human range. d C. The temperature is at the boiling point of pure tap water. 11 11. When accurately measuring the volume of a liquid in a graduated cylinder, how should you read the meniscus? a B. At the lowest point of the curved liquid surface. b D. By viewing it from below the heavy bottom base unit. c C. By looking from above the rim of the glass cylinder. d A. At the highest point of the curved liquid surface. 12 12. When using a triple beam balance or a platform balance to measure mass, what is the most important step you should do first before placing the object on the pan? a B. Place the heaviest weight on the measurement pan first. b A. Ensure all the sliding riders are exactly set to zero. c C. Record the current room temperature of the laboratory. d D. Subtract the mass of the empty weighing container used. 13 13. A student accurately measured the time it took for a toy car to travel a ramp in three separate trials: 12 seconds, 14 seconds, and 16 seconds. What is the average time? a A. 12 b B. 14 c D. 42 d C. 16 14 14. Why is it highly important for scientists to organize their collected numerical data into clear tables or graphs? a D. It replaces the need to write a conclusion for the whole study. b C. It provides a visual way to easily identify patterns and trends. c B. It makes the scientific report look much more colorful and fun. d A. It conceals the random errors made during the actual experiment. 15 15. You have collected numerical data tracking the rising temperature of water every 2 minutes while heating it over a burner. What is the most appropriate way to organize and present this continuous data? a C. A pie chart representing different water sources in the lab. b D. A scatter plot of the water volume versus the container size. c A. A bar graph showing only the final temperature of the water. d B. A line graph showing the temperature changes over the time. 16 16. In a simple chemical mixture consisting of a spoonful of sugar thoroughly dissolved in a glass of water, what is the specific role of the sugar? a B. Solution b C. Solvent c A. Solute d D. Suspension 17 17. Which of the following statements correctly differentiates a solvent from a solute in a solution? a D. The solvent is much smaller in amount; the solute is much larger. b A. The solvent dissolves the solute; the solute is what is dissolved. c C. The solvent is what is dissolved; the solute does the dissolving. d B. The solvent is always a solid; the solute is always a liquid form. 18 18. You keep adding salt to a glass of water and continuously stir it. Eventually, the salt stops dissolving and simply settles at the bottom. What does this observation mean? a C. The solvent has suddenly turned into a solid block of sodium. b A. The salt has completely evaporated into the surrounding air. c B. The solution has already reached its maximum saturation. d D. The water has magically lost its ability to attract anything. 19 19. A student is preparing a cup of hot chocolate. Why does the chocolate powder dissolve noticeably faster in hot milk than in cold milk? a D. Hot milk produces its own internal intense chocolate flavor. b C. Hot milk particles move faster and collide more frequently. c B. Cold milk naturally rejects any newly added solid particles. d A. Cold milk has particles that move extremely fast inside it. 20 20. Aside from increasing the temperature, which basic action will also speed up the dissolving process of a solid solute in a solvent? a B. Cooling the container inside a large bowl of solid cold ice. b D. Stirring the mixture continuously using a clean glass rod. c A. Adding more solid solute to the exact same amount of liquid. d C. Leaving the mixture completely undisturbed for a whole hour. 21 21. Based on the factors that affect solubility, which combination of actions will dissolve a solid sugar cube the fastest? a B. Crushing the sugar cube and thoroughly mixing it in hot water. b A. Crushing the sugar cube and thoroughly mixing it in cold water. c D. Dropping the whole intact sugar cube straight into hot water. d C. Dropping the whole intact sugar cube straight into cold water. 22 22. Which piece of specific laboratory equipment is best used for transferring or measuring very small, exact amounts of liquid, such as 5 milliliters? a A. Beaker b B. Florence flask c D. Pipette d C. Petri dish 23 23. What is the primary and safest use of a mortar and pestle in a science experiment? a D. Measuring the exact mass of a newly formed solid object. b A. Crushing and grinding solid substances into fine powder. c B. Heating small amounts of chemical liquids over a flame. d C. Holding multiple test tubes securely in an upright form. 24 24. When heating a chemical substance inside a test tube over a Bunsen burner or an alcohol lamp, how should you properly position the open end of the tube? a B. Pointed towards the ceiling to effectively capture all gases. b A. Pointed directly towards your own face to carefully observe. c C. Pointed towards your lab partner for a much better viewing. d D. Pointed away from yourself and anyone else working nearby. 25 25. Why is the student required to use tongs instead of their bare hands or a regular piece of cloth? a B. To keep the crucible completely free from any airborne germs. b D. To stop the internal chemical reaction from happening fast. c A. To ensure that the expensive crucible does not suddenly melt. d C. To prevent severe skin burns from the extremely hot object.

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(Term 1) 2nd Summative Test in Science 7Versión en línea

por MERY ROSE SANTIAGO

1. In conducting a scientific investigation, what is typically the very first essential step that a researcher must do?

2. Which part of a scientific investigation contains the detailed, step-by-step procedures used to conduct the experiment?

3. You notice that your phone9s battery drains extremely fast. You think that reducing the screen brightness will make it last longer. In the scientific method, what does your thought represent?

4. A student observed and recorded the height of a mung bean plant for seven consecutive days. Which part of the scientific investigation do these recorded measurements belong to?

5. A scientist wants to find out if a new organic fertilizer increases plant height. She applies it to Plant A and gives zero fertilizer to Plant B. What is the specific role of Plant B in this experiment?

6. After testing, you found that salt dissolves significantly faster in hot water than in cold water. Based on your results, what is your scientific conclusion?

7. A student claims, "My experiment is a total failure because my final results did not match my initial hypothesis." Is this statement scientifically sound?

8. Which of the following is considered the standard metric unit for measuring the mass of a solid chemical in the laboratory?

9. A digital timer reads exactly 01:50 during an experiment. What does this measurement accurately represent in total seconds?

10. If a student reads a laboratory thermometer and it points exactly to 37 0C, what does this indicate in a human body context?

11. When accurately measuring the volume of a liquid in a graduated cylinder, how should you read the meniscus?

12. When using a triple beam balance or a platform balance to measure mass, what is the most important step you should do first before placing the object on the pan?

13. A student accurately measured the time it took for a toy car to travel a ramp in three separate trials: 12 seconds, 14 seconds, and 16 seconds. What is the average time?

14. Why is it highly important for scientists to organize their collected numerical data into clear tables or graphs?

15. You have collected numerical data tracking the rising temperature of water every 2 minutes while heating it over a burner. What is the most appropriate way to organize and present this continuous data?

16. In a simple chemical mixture consisting of a spoonful of sugar thoroughly dissolved in a glass of water, what is the specific role of the sugar?

17. Which of the following statements correctly differentiates a solvent from a solute in a solution?

18. You keep adding salt to a glass of water and continuously stir it. Eventually, the salt stops dissolving and simply settles at the bottom. What does this observation mean?

19. A student is preparing a cup of hot chocolate. Why does the chocolate powder dissolve noticeably faster in hot milk than in cold milk?

20. Aside from increasing the temperature, which basic action will also speed up the dissolving process of a solid solute in a solvent?

21. Based on the factors that affect solubility, which combination of actions will dissolve a solid sugar cube the fastest?

22. Which piece of specific laboratory equipment is best used for transferring or measuring very small, exact amounts of liquid, such as 5 milliliters?

23. What is the primary and safest use of a mortar and pestle in a science experiment?

24. When heating a chemical substance inside a test tube over a Bunsen burner or an alcohol lamp, how should you properly position the open end of the tube?

25. Why is the student required to use tongs instead of their bare hands or a regular piece of cloth?

3. You notice that your phone9s battery drains extremely fast. You think that reducing the screen brightness will make it last longer. In the scientific method, what does your thought represent?

10. If a student reads a laboratory thermometer and it points exactly to 370C, what does this indicate in a human body context?