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Grade 9 Final Revision

Ms. Nisa
26
0
Masalah tambahan (20/ 20)
Allow incorrect answer
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masalah 1

pilihan

What is the main characteristic of Group 1 elements in the periodic table?

  • They are non-metals
  • They are noble gases
  • They are highly reactive metals
  • They are transition metals

masalah 2

pilihan

Which element in Group 1 is the most reactive?

  • Lithium
  • Sodium
  • Potassium
  • Francium

masalah 3

pilihan

How many valence electrons do Group 1 elements have?

  • One
  • Two
  • Three
  • Four

masalah 4

pilihan

What is the electronic structure of sodium (Na)?

  • 2, 8, 1
  • 2, 8, 2
  • 2, 8, 3
  • 2, 8, 4

masalah 5

pilihan

What characteristic is common among Group 7 elements?

  • They are all gases
  • They are all metals
  • They are all non-metals and highly reactive
  • They are inert

masalah 6

pilihan

Which element is a halogen?

  • Oxygen
  • Nitrogen
  • Chlorine
  • Neon

masalah 7

pilihan

How many valence electrons do Group 7 elements have?

  • Five
  • Six
  • Seven
  • Eight

masalah 8

pilihan

What happens when a Group 1 metal reacts with a Group 7 element?

  • They form a salt
  • They form water
  • They form a gas
  • They form a metal alloy

masalah 9

pilihan

Which of the following is a property of alkali metals?

  • High density
  • High melting point
  • Softness
  • Low reactivity

masalah 10

pilihan

What is the electronic structure of chlorine (Cl)?

  • 2, 8, 5
  • 2, 8, 6
  • 2, 8, 7
  • 2, 8, 8

masalah 11

pilihan

What is the rate of a chemical reaction?

  • The speed at which reactants are converted into products
  • The amount of reactants used
  • The color change in a reaction
  • The energy absorbed in a reaction

masalah 12

pilihan

Which factor does NOT affect the rate of a chemical reaction?

  • Temperature
  • Concentration of reactants
  • Presence of a catalyst
  • Color of the reactants

masalah 13

pilihan

How does increasing the temperature affect the rate of reaction?

  • It decreases the rate
  • It increases the rate
  • It has no effect
  • It stops the reaction

masalah 14

pilihan

What role does a catalyst play in a chemical reaction?

  • It increases the amount of reactants
  • It provides energy to the reaction
  • It changes the products formed
  • It speeds up the reaction without being consumed

masalah 15

pilihan

Which of the following increases the rate of reaction by increasing the surface area?

  • Breaking a solid into smaller pieces
  • Decreasing the temperature
  • Adding water to the reaction
  • Using a larger container

masalah 16

pilihan

Why does increasing the concentration of reactants increase the rate of reaction?

  • It decreases the energy of the reactants
  • It increases the chance of collisions between reactant molecules
  • It changes the nature of the reactants
  • It reduces the volume of the reaction container

masalah 17

pilihan

How does pressure affect the rate of reaction in gases?

  • Increasing pressure decreases the rate
  • Increasing pressure increases the rate
  • Pressure has no effect
  • Pressure changes the reactants

masalah 18

pilihan

What is the effect of a catalyst on the activation energy of a reaction?

  • It increases the activation energy
  • It decreases the activation energy
  • It has no effect
  • It doubles the activation energy

masalah 19

pilihan

Which factor can slow down the rate of a chemical reaction?

  • Increasing temperature
  • Increasing concentration
  • Decreasing surface area
  • Adding a catalyst

masalah 20

pilihan

What is an example of a real-life catalyst?

  • Water in making ice
  • Salt in boiling water
  • Enzymes in digestion
  • Sugar in tea
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