27. What is the purpose of doing multiple trials in an experiment?A. To get as much data as possible.B. To make sure the procedure is done correctly every time.C. Eliminate observations that are not typical and reduce errors.D. To double-check the results so they are the same each time.28. 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.29. Ten (10) tomato seedlings in one set-up were grown in a dark room while ten (10)seedlings in other set-up were exposed to sunlight. In both set-ups, all conditions are keptconstant. The seedling grown in the dark became pale with long slender stem and soondied. The seedlings exposed to sunlight were green and healthy. How would you show yourunderstanding of the hypothesis being tested for the investigation?A. Sunlight is necessary for the growth of plants.8. The green pigment of the leaf disappears in the dark.C. Sunlight is necessary for proper mineral absorption of plants.D. Plants in the dark cannot perform the process of photosynthesis30. Which of the following substance is an element?A. Carbon dioxide31. Salt is made up of what elements?A. Sodium and ChlorideB. IronC. SaltD. SugarB. Sodium and CopperA. Carbon dioxideC. Sodium and ChlorineD. Sodium and Oxide32. Which of the following substance is NOT a compound?B. HydrogenC. Salt33. What is the volume of a 20% methyl solution that contains 15mL of methyl?A. 6 mL of methylB. 5 mL of methylC. 4 mL of methylD. 3mL of methylD. Sugar34. Rubbing alcohol is sold as a 70 % (v/v) solution of isopropyl alcohol in water. What volume ofisopropyl alcohol is used to make 500mL of rubbing alcohol?A. 330 mLB. 340C. 350 mLD. 360 ml35. What is the percent by volume of a solution formed by mixing 25mL of isopropanol with 45mLwater? A. 35.71 %B. 31.75 %C. 37.15%D. 32.71 %36. A photographic "stop bath" contains 160mL of pure acetic acid, HC2H302(1) in 650mL solution.What is the v/v concentration of acetic acid in the stop bath?A. 2.46%B. 24.61%C. 25%D. 26.41 %37. The active ingredient in wines and other alcoholic beverages is ethanol. A 300mL sample ofwine was found to contain 37.5mL of ethanol. What is the percentage by volumeconcentration of ethanol in the wine sample?A. 1.25%B. 125 %C. 12.5%D. 10%

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27. What is the purpose of doing multiple trials in an experiment?A. To get as much data as possible.B. To make sure the procedure is done correctly every time.C. Eliminate observations that are not typical and reduce errors.D. To double-check the results so they are the same each time.28. 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.29. Ten (10) tomato seedlings in one set-up were grown in a dark room while ten (10)seedlings in other set-up were exposed to sunlight. In both set-ups, all conditions are keptconstant. The seedling grown in the dark became pale with long slender stem and soondied. The seedlings exposed to sunlight were green and healthy. How would you show yourunderstanding of the hypothesis being tested for the investigation?A. Sunlight is necessary for the growth of plants.8. The green pigment of the leaf disappears in the dark.C. Sunlight is necessary for proper mineral absorption of plants.D. Plants in the dark cannot perform the process of photosynthesis30. Which of the following substance is an element?A. Carbon dioxide31. Salt is made up of what elements?A. Sodium and ChlorideB. IronC. SaltD. SugarB. Sodium and CopperA. Carbon dioxideC. Sodium and ChlorineD. Sodium and Oxide32. Which of the following substance is NOT a compound?B. HydrogenC. Salt33. What is the volume of a 20% methyl solution that contains 15mL of methyl?A. 6 mL of methylB. 5 mL of methylC. 4 mL of methylD. 3mL of methylD. Sugar34. Rubbing alcohol is sold as a 70 % (v/v) solution of isopropyl alcohol in water. What volume ofisopropyl alcohol is used to make 500mL of rubbing alcohol?A. 330 mLB. 340C. 350 mLD. 360 ml35. What is the percent by volume of a solution formed by mixing 25mL of isopropanol with 45mLwater? A. 35.71 %B. 31.75 %C. 37.15%D. 32.71 %36. A photographic "stop bath" contains 160mL of pure acetic acid, HC2H302(1) in 650mL solution.What is the v/v concentration of acetic acid in the stop bath?A. 2.46%B. 24.61%C. 25%D. 26.41 %37. The active ingredient in wines and other alcoholic beverages is ethanol. A 300mL sample ofwine was found to contain 37.5mL of ethanol. What is the percentage by volumeconcentration of ethanol in the wine sample?A. 1.25%B. 125 %C. 12.5%D. 10%​

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to make sure the procedureis done correctly every time

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