TERM1 EXAM REGULAR

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SCIENCE

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Dee Rivera

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TERM1 EXAM REGULAR


TERM1 EXAM REGULARVersión en línea SCIENCE por Dee Rivera 1 In a chemical reaction, what happens to the atoms of the reactants? a They disappear after releasing energy. b They change into entirely new elements. c They increase in number as products form. d They rearrange to form new substances. 2 Which statement expresses the law of conservation of mass? a Only solid reactants produce liquid products contribute to total mass. b The mass of the products is always greater than that of the reactants. c Atoms lose their atomic mass and atomic weight whenever heat is released. d The mass of the products equals the mass of the reactants in a closed system. 3 Why must a chemical equation have the same number of each type of atom on both sides? a The reactants and products must have equal volumes. b Every reaction must produce the same number of molecules. c Atoms are rearranged but are neither created nor destroyed. d Each substance and mixtures must have the same coefficient. 4 A sealed flask contains 12 g of carbon and 32 g of oxygen before they react completely. What total mass should the products have? a 20 g b 44 g c 32 g d 56 g 5 A student reacts vinegar and baking soda in an open cup and records a lower final mass. Which conclusion is best supported? a Mass was destroyed because bubbles formed. b The law of conservation of mass applies only to solids. c The balance must be wrong because product mass can never appear lower. d Some gaseous product escaped; a sealed setup is needed to test total mass fairly. 6 Which household substance is commonly acidic? a Vinegar b Soap solution c Bleach solution d Baking-soda solution 7 What does blue litmus paper usually do in an acidic solution? a It turns red. b It remains blue. c It turns light green. d It becomes colorless. 8 A solution turns red litmus paper blue. How should the solution be classified? a Acidic b Basic c Neutral salt only d Pure water 9 A learner tests calamansi juice, soapy water, and saline solution with universal indicator. Which result is most reasonable? a Calamansi: blue; soap: red; saline: violet b Calamansi: green; soap: green; saline: red c Calamansi: violet; soap: yellow; saline: blue d Calamansi: red-orange; soap: blue; saline: green 10 An unlabeled clear liquid turns blue litmus red and has a pH of 2. Which action is safest and scientifically justified? a Taste a drop to confirm that it is an acid. b Mix it with bleach to observe a stronger color change. c Treat it as an acid, avoid direct contact, and report it to the teacher. d Pour it into the sink because all acids dissolve in water and it can clean tiles.

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TERM1 EXAM REGULARVersión en línea

por Dee Rivera

In a chemical reaction, what happens to the atoms of the reactants?

Which statement expresses the law of conservation of mass?

Why must a chemical equation have the same number of each type of atom on both sides?

A sealed flask contains 12 g of carbon and 32 g of oxygen before they react completely. What total mass should the products have?

A student reacts vinegar and baking soda in an open cup and records a lower final mass. Which conclusion is best supported?

Which household substance is commonly acidic?

What does blue litmus paper usually do in an acidic solution?

A solution turns red litmus paper blue. How should the solution be classified?

A learner tests calamansi juice, soapy water, and saline solution with universal indicator. Which result is most reasonable?

An unlabeled clear liquid turns blue litmus red and has a pH of 2. Which action is safest and scientifically justified?