Grade 10 · Science · Chemistry

10th grade Why things dissolve: polarity, electrolytes and nonelectrolytes worksheet

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Why things dissolve: polarity, electrolytes and nonelectrolytes

Grade 10 Science Worksheet - Challenge Me

NameDate

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

29.22 g of table salt (NaCl, 58.44 g/mol) dissolves in water. How many moles of ions form, to 0.01 mol, Esme?
116.88 g of table salt (NaCl, 58.44 g/mol) dissolves in water. How many moles of ions form, to 0.01 mol, Jun?
3.
Ari says sugar water conducts, since anything dissolved does. Which reply fits, Luz?
- Agree: each dissolved substance forms ions that carry charge
- Agree, if the water is warm
- Disagree: sugar stays as whole molecules, with no ions
4.
Bo says water can dissolve oil if you stir hard enough. Which reply fits, Noah?
- Disagree: polar water and nonpolar oil do not dissolve
- Agree: stirring long enough dissolves any substance in time
- Agree, if the oil is warm
5.
Which pairing dissolves, Pia?
- Sugar in water
- Cooking oil in water, after hard stirring
- Salt in cooking oil
6.
A greasy spot won't wash off a pan with plain water. Why, Ren?
- Grease is nonpolar, so water can't dissolve it
- Grease does dissolve in plain water, just very slowly
- The water is not salty enough
7.
Which solvent would dissolve table salt best, Tala?
- Melted candle wax
- Water
- Cooking oil
8.
Which drawing shows salt dissolved in water, Zee?
- Separate Na⁺ and Cl⁻ ions, each ringed by water
- A puddle of melted salt under the water
- Whole NaCl pairs floating in the water
9.
Which drawing shows sugar dissolved in water, Ari?
- Sugar sitting in a white layer on top of the water
- Whole sugar molecules spread among water molecules
- Sugar split into charged pieces, as salt would be
10.
Which drawing shows salt and sugar dissolved in one cup, Bo?
- Na⁺ and Cl⁻ ions apart, with whole sugar molecules
- Whole NaCl pairs floating beside whole sugar molecules
- Salt ions, with sugar split into ions too

10th grade Why things dissolve: polarity, electrolytes and nonelectrolytes worksheet – printable — Print: 1 2 3 4 5 6

About this worksheet

Why things dissolve: polarity, electrolytes and nonelectrolytes. Every version has 10 questions, and the answer key prints on the second page.

What your child will learn

I can explain "like dissolves like": polar water dissolves salt and sugar, but not oil.
I can tell electrolytes (salt and baking soda form ions and conduct) from nonelectrolytes (sugar stays whole).
I can count dissolved particles: 1 mol of NaCl gives 2 mol of ions, and 1 mol of sugar gives 1 mol of molecules.

Standard: none (TX, FL)

Words to know

polar: Having slightly charged ends, like a water molecule

ion: A charged particle, such as Na⁺ or Cl⁻

electrolyte: A substance that forms ions in water, so the solution conducts

nonelectrolyte: A substance that dissolves as whole molecules, so the solution does not conduct

Common mistakes

Your child counted dissolved salt as one particle. Salt splits into two ions, Na⁺ and Cl⁻, so 1 mol gives 2 mol of ions.

Your child thought sugar forms ions. Sugar molecules separate but stay whole, so sugar water doesn't conduct.

Your child pictured salt dissolving as whole units. Water pulls salt apart into Na⁺ and Cl⁻ ions.

Questions parents ask

What is the most common mistake with why things dissolve: polarity, electrolytes and nonelectrolytes?

Your child counted dissolved salt as one particle. Salt splits into two ions, Na⁺ and Cl⁻, so 1 mol gives 2 mol of 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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