Quiz: TERM1 EXAM REGULAR


TERM1 EXAM REGULAROnline version SCIENCE by 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.

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.

You can integrate the game into an LMS compatible with LTI 1.1 or LTI 1.3 such as Canvas, Moodle, or Blackboard. This way, the scores will be automatically saved into the platform’s gradebook.

TERM1 EXAM REGULAR

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TERM1 EXAM REGULAROnline version

by 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?

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