Back to the lesson and practice
ActivityPractice worksheet
Do it🖨️ On paper✏️ On screen
New copyMake a new one

Works with a finger, a stylus or a mouse. Nothing is saved or sent anywhere.

Write your answers with a finger, mouse or stylus. Switch to Scroll to move around the page. A stylus always writes.

eurekami

9th grade chemical reactions, acids and bases

9th grade (Year 10 in England) · 14 questions · Common Core: NGSS.MS-PS1-5, NGSS.HS-PS1-7, NGSS.HS-PS1-5, NGSS.HS-PS1-2 · England: KS4 Combined Science: Chemical changes, KS4 Combined Science: The rate and extent of chemical change, KS3 Chemistry: Chemical reactions

Name

Date

Score/ 14

  1. Question 1

    Sodium hydroxide solution is added to a solution and a green precipitate forms. Which metal ion is present?

    • A. copper(II), Cu²⁺
    • B. iron(II), Fe²⁺
    • C. iron(III), Fe³⁺
    • D. calcium, magnesium or aluminium ions

  2. Question 2

    Rates of reaction: which statement is NOT true?

    • A. Lower temperatures make reactions faster.
    • B. Increasing surface area increases the rate.
    • C. Food lasts longer in a fridge because reactions are slower at low temperature.
    • D. Reactions need particles to collide with enough energy.

  3. Question 3

    Marble chips fizz in acid. Which test identifies the gas made?

    • A. a lighted splint pops
    • B. limewater turns milky
    • C. damp litmus is bleached
    • D. a glowing splint relights

  4. Question 4

    A reaction produces 15 cm³ of gas in 30 seconds. What is the mean rate of reaction, in cm³/s?

    Answercm³/s

  5. Question 5

    What does a catalyst do?

    • A. is used up in the reaction
    • B. slows down a reaction
    • C. changes the products
    • D. speeds up a reaction without being used up

  6. Question 6

    What is the molecular formula of ethane, the alkane with 2 carbon atoms?

    • A. C₂H₄
    • B. C₂H₆
    • C. C₃H₆
    • D. C₂H₅

  7. Question 7

    Balance the equation. What number goes in the gap? N₂ + 3H₂ → __NH₃

    Answer

  8. Question 8

    Which gas gives this result: a glowing splint relights?

    • A. hydrogen
    • B. oxygen
    • C. carbon dioxide
    • D. chlorine

  9. Question 9

    What does "oxidation" mean in terms of oxygen?

    • A. melting
    • B. gain of oxygen
    • C. gain of hydrogen
    • D. loss of oxygen

  10. Question 10

    Tests for gases: which statement is NOT true?

    • A. Hydrogen gives a squeaky pop with a lighted splint.
    • B. Carbon dioxide relights a glowing splint.
    • C. Limewater is a solution of calcium hydroxide.
    • D. Chlorine may turn damp blue litmus red before bleaching it.

  11. Question 11

    Firework makers want a bright green colour. Which compounds should they add?

    • A. lithium compounds
    • B. sodium compounds
    • C. copper compounds
    • D. potassium compounds

  12. Question 12

    CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂ How many O atoms are on the left side of this balanced equation?

    Answer

  13. Question 13

    Why is crude oil called a finite (non-renewable) resource?

    • A. It is made from sunlight each day
    • B. It formed over millions of years and is used much faster than it forms
    • C. It is made in factories
    • D. It never runs out

  14. Question 14

    Which equation is correctly balanced?

    • A. Zn + 2HCl → ZnCl₂ + H₂
    • B. Zn + 2HCl → 2ZnCl₂ + H₂
    • C. 2Zn + 2HCl → ZnCl₂ + H₂
    • D. Zn + 3HCl → ZnCl₂ + H₂

Write your answers right on the page. · Free from eurekami.com

All done? Check your answers
  1. iron(II), Fe²⁺
  2. Lower temperatures make reactions faster.
  3. limewater turns milky
  4. 0.5 cm³/s
  5. speeds up a reaction without being used up
  6. C₂H₆
  7. 2
  8. oxygen
  9. gain of oxygen
  10. Carbon dioxide relights a glowing splint.
  11. copper compounds
  12. 3
  13. It formed over millions of years and is used much faster than it forms
  14. Zn + 2HCl → ZnCl₂ + H₂