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

NameDate

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

A cup holds 1 mol of dissolved sugar and 1 mol of dissolved salt. How many moles of dissolved particles is that, Bo?
A cup holds 0.5 mol of dissolved sugar and 0.25 mol of dissolved salt. How many moles of dissolved particles is that, Esme?
A jug holds 2 mol of dissolved sugar and 0.5 mol of dissolved salt. How many moles of dissolved particles is that, Jun?
4.
In salt water, what are the dissolved particles, Luz?
- Tiny drops of melted salt
- Whole NaCl units
- Separate Na⁺ and Cl⁻ ions
5.
Why can water pull salt apart, Milo?
- It cuts the salt into whole NaCl pieces
- Its heat melts the salt crystal
- Its charged ends attract the ions
6.
What happens to sugar as it dissolves, Noah?
- Its molecules spread apart but stay whole
- Its molecules split into charged ions, like salt
- It melts into syrup
7.
Why does sugar dissolve in water even though it forms no ions, Ren?
- Sugar does form ions in water
- Sugar is polar enough to attract water
- Sugar melts in water
8.
A tester lights brightly in salt water, dimly in circle water and not at all in sugar water. Which holds the most ions, Tala?
- They hold the same ions
- The sugar water
- The salt water
9.
Why does circle water light the tester a little, Zee?
- Water molecules themselves split into many ions in the tap
- It holds a few dissolved ions from minerals
- Dissolved sugar in it forms ions
10.
Baking soda water lights the tester. What does that show, Ari?
- Baking soda melted in the water
- Baking soda stays as whole molecules
- Baking soda forms ions: it is an electrolyte

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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