Grade 10 · Science · Chemistry

10th grade The equilibrium constant, K worksheet

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The equilibrium constant, K

Grade 10 Science Worksheet

NameDate

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

At equilibrium for N₂O₄ ⇌ 2 NO₂, [N₂O₄] = 0.04 mol/L and [NO₂] = 0.1 mol/L. What is K, Ari?
At equilibrium for N₂O₄ ⇌ 2 NO₂, [N₂O₄] = 0.3 mol/L and [NO₂] = 0.06 mol/L. What is K, Bo?
At equilibrium for N₂O₄ ⇌ 2 NO₂, [N₂O₄] = 0.1 mol/L and [NO₂] = 0.05 mol/L. What is K, Esme?
4.
Which is K for H₂ + I₂ ⇌ 2 HI, Kira?
- 2[HI] ÷ ([H₂][I₂])
- ([H₂][I₂]) ÷ [HI]²
- [HI]² ÷ ([H₂][I₂])
5.
Which is K for CaCO₃(s) ⇌ CaO(s) + CO₂(g), Luz?
- [CO₂]
- [CaCO₃] ÷ [CaO]
- [CaO][CO₂] ÷ [CaCO₃]
6.
For a mixture, Q is smaller than K. Which way does the reaction go, Milo?
- Neither way
- Forward, toward products
- Backward, toward reactants
7.
For a mixture, Q is larger than K. Which way does the reaction go, Noah?
- Forward, toward products
- Backward, toward reactants
- Neither way
8.
For a mixture, Q equals K. What happens, Pia?
- No net change: it's at equilibrium
- It speeds up in the forward direction
- It runs backward fast
9.
Extra reactant is added to a mixture at equilibrium. What happens, Ren?
- Q drops below K; it shifts forward
- K rises to match Q
- Q rises above K; it shifts back
10.
Some product is removed from a mixture at equilibrium. What happens, Tala?
- K falls
- More reactant forms
- More product forms

The equilibrium constant, K. Every version has 10 questions, and the answer key prints on the second page.

I can write K: products over reactants, with coefficients as powers, leaving out pure solids and liquids.
I can calculate K from given equilibrium concentrations.
I can read a large K as mostly products and a small K as mostly reactants.
I can compare Q with K and predict the effect of changing a concentration.

Standard: supports HS-PS1-6

equilibrium constant, K: Products over reactants at equilibrium, with coefficients as powers

reaction quotient, Q: The same ratio for any mixture

homogeneous: All in one phase, such as all gases

heterogeneous: With more than one phase; pure solids and liquids are left out

extent: How far a reaction goes

Your child put the reactant on top. K is products over reactants.

Your child left out the square. The 2 in front of NO₂ becomes a power: K = [NO₂]² ÷ [N₂O₄].

Your child multiplied by the coefficient 2. In K the coefficient is a power: [HI]², not 2 × [HI].

What is the most common mistake with the equilibrium constant, k?

Your child put the reactant on top. K is products over reactants.

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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