What makes an acid or a base

Answer Key - Grade 10 Science Worksheet - Challenge Me

Circle the best answer, or write your answer on the line.

1. 1.

   Water, H₂O, has charge 0 and gives up one H⁺. What is the charge of its conjugate base, Ari?

   -1
2. 2.

   The hydrogen sulfate ion has charge -1 and gives up one H⁺. What is the charge of its conjugate base, Bo?

   -2
3. 3.

   The ammonium ion has charge +1 and gives up one H⁺. What is the charge of its conjugate base, Esme?

   0
4. 4.

   In HCO₃⁻ + H₂O → CO₃²⁻ + H₃O⁺, what role does HCO₃⁻ play, Jun?

   • Neither: it is a spectator
   • Acid: it donates a proton
   • Base: it accepts a proton
5. 5.

   In HCO₃⁻ + H₃O⁺ → H₂CO₃ + H₂O, what role does HCO₃⁻ play, Kira?

   • Base: it accepts a proton
   • Acid: it donates a proton
   • Neither: it stays unchanged
6. 6.

   What is a particle like HCO₃⁻ or H₂O, which can donate or accept a proton, called, Luz?

   • Amphiprotic
   • Neutral
   • Insoluble
7. 7.

   Milo says ammonia can't be a base because its formula has no OH⁻. Agree or disagree?

   • Disagree: it accepts a proton
   • Agree: a base must contain OH⁻
   • Agree: ammonia is an acid
8. 8.

   Noah says the carbonate ion, CO₃²⁻, can't be a base because it has no OH⁻. Agree or disagree?

   • Disagree: it accepts protons
   • Agree: without OH⁻ there is no base
   • Agree: carbonate gives off H⁺ ions
9. 9.

   Which is a conjugate acid-base pair, Ren?

   • H₂O and OH⁻
   • HCl and NaOH
   • H₂O and H₂O₂
10. 10.

    What is the conjugate acid of water, Tala?

    • H₂O₂
    • OH⁻
    • H₃O⁺