Grade 10 · Science · Chemistry

10th grade Strong and weak acids and bases worksheet

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Strong and weak acids and bases

Grade 10 Science Worksheet - Building Confidence

NameDate

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

A model drawing of acetic acid shows 40 molecules; 1 of them split into ions. What percent split, Ari?
A model drawing of acetic acid shows 80 molecules; 1 of them split into ions. What percent split, Bo?
3.
Using the drawings, what makes HCl a strong acid, Kira?
- It is a very concentrated acid
- Its smell is stronger than others
- Its molecules all split into ions
4.
Using the drawings, what is mostly present in the acetic acid solution, Luz?
Use the picture in question 3.
- H⁺ and CH₃COO⁻ ions
- Cl⁻ and H⁺ ions
- Whole CH₃COOH molecules
5.
Which of these acids is strong, Milo?
- Acetic acid
- Citric acid
- Hydrochloric acid
6.
Which of these bases is strong, Noah?
- Ammonia
- Sodium hydroxide
- Baking soda
7.
Vinegar's acid is acetic acid. Is acetic acid strong or weak, Pia?
- Strong: it splits completely
- Strong: vinegar tastes sour
- Weak: it splits partly
8.
Which arrow fits a weak acid splitting in water, Ren?
- ←, backward
- ⇌, both ways
- →, forward and complete
9.
HCl → H⁺ + Cl⁻ is written with a one-way arrow. Why, Tala?
- Cl⁻ is a strong base
- HCl stays as whole molecules
- HCl ionizes completely
10.
Which particles are mostly present in hydrochloric acid, Zee?
- Whole HCl molecules
- H₃O⁺ and Cl⁻ ions
- OH⁻ and Na⁺ ions

Strong and weak acids and bases. Every version has 10 questions, and the answer key prints on the second page.

I can say that strong acids and bases split completely and weak ones only partly, and name common examples.
I can tell strength (how much splits) from concentration (how much is dissolved).
I can find percent ionization and compare H⁺ in strong and weak acids of the same concentration.
I can use Ka and Kb: a larger value means a stronger acid or base.

Standard: none (TX)

strong acid: An acid that ionizes completely in water, such as HCl or HNO₃

weak acid: An acid that ionizes only partly, such as acetic acid

concentration: How much solute is dissolved per liter (M)

percent ionization: 100 × [H⁺] ÷ starting concentration

Ka: The acid ionization constant; larger means stronger

Your child gave the percent of molecules that stayed whole. The question asks for the percent that split into ions.

Your child gave a fraction, not a percent. Multiply [H⁺] ÷ concentration by 100.

Your child assumed equal concentrations give equal H⁺. A strong acid ionizes completely; a weak one only partly.

What is the most common mistake with strong and weak acids and bases?

Your child gave the percent of molecules that stayed whole. The question asks for the percent that split into ions.

Are these 10th grade science worksheets free to print?

Yes. All 6 printable versions at each level are free to print, with the answer key, and no account is needed.

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