Grade 5 Solutions & Mixtures worksheet
from Gradelings · Name: ______________________
How to explain it
- In a solution, one substance dissolves into another, like salt in water.
- A filter separates things that don't dissolve, like sand from water.
- Dissolved salt is too tiny for a filter, so heat the water to evaporate it. The salt stays behind.
- Cool the vapour and it condenses back into pure water.
Example: How could you get the salt back out of salt water? Salt is dissolved, so a filter won't catch it. Heat the water until it evaporates. The salt is left behind. Answer: evaporate the water
Question 1
Kenji has a dry mix of iron filings, sand and salt. Put his separation steps in order.
- 🧲Run a magnet through the dry mix to pull out the iron
- ☕Pour it through a filter to catch the sand
- 🥄Add water and stir until the salt dissolves
- ☀️Let the water evaporate to leave the salt
Run a magnet through the dry mix to pull out the iron → Add water and stir until the salt dissolves → Pour it through a filter to catch the sand → Let the water evaporate to leave the salt
Hint: Use the magnet while the mix is still dry. Then dissolve the salt, filter out the sand, and evaporate the water to get the salt back.
Question 2
Which tool would best separate sand from water?
- a magnet
- a ruler
- a thermometer
- a filter, like a coffee filter
a filter, like a coffee filter
Hint: A filter lets water through but catches the bigger, undissolved sand grains.
Question 3
A class tested four powders. Which powder is the least soluble in water?
Grams that dissolved in 100 mL of water at room temperature Substance Amount dissolved Powder A 12 g Powder B 47 g Powder C 9 g Powder D 33 g - Powder B
- Powder A
- Powder D
- Powder C
Powder C
Hint: The least soluble substance dissolved the smallest amount. Find the smallest number.
Question 4
A sieve separates the parts of a mixture by their…
- magnetism
- size
- colour
- temperature
size
Hint: Small pieces fall through the holes in a sieve; bigger pieces stay on top.
Question 5
Which would make sugar dissolve faster in water?
🥄- using bigger sugar cubes
- stirring
- using colder water
- keeping the water perfectly still
stirring
Hint: Stirring, warmer water and smaller pieces all help a solid dissolve faster.
Question 6
Is dissolving sugar in water a change that can be reversed?
- yes, if the water evaporates the sugar is left
- no, the sugar is destroyed
- no, it becomes a brand-new substance
- only if you freeze it
yes, if the water evaporates the sugar is left
Hint: Dissolving is a physical change. The sugar is still there, and evaporating the water brings it back.
Question 7
Soluble or insoluble in water? Tap an item, then tap its basket.
Sort into: 💧 soluble · 🚫 insoluble
- 🍚uncooked rice
- 🏖️sand
- 🧃drink crystals
- 🧂table salt
- 🧁baking soda
- 🪨pebbles
💧 soluble: drink crystals, table salt, baking soda · 🚫 insoluble: uncooked rice, sand, pebbles
Hint: A soluble substance dissolves and seems to disappear in water. An insoluble one stays visible, sinks or floats.
Question 8
What is a saturated solution?
- a mixture with visible pieces
- a solution that can't dissolve any more solute
- a solution with no solute at all
- a solution that has frozen
a solution that can't dissolve any more solute
Hint: Keep adding salt to water and eventually it stops dissolving and piles up on the bottom. The solution is saturated.
Question 9
How can you get pure water back from salt water? Put the steps in order.
- ♨️Water evaporates and the salt stays behind
- 🔥Heat the salt water
- ❄️The vapour touches a cold surface and condenses
- 💧Drops of pure water drip into a clean cup
Heat the salt water → Water evaporates and the salt stays behind → The vapour touches a cold surface and condenses → Drops of pure water drip into a clean cup
Hint: Heat makes the water evaporate and leave the salt behind. Then the water vapour cools, condenses and drips into a clean container.
Question 10
Which tool would separate iron filings from sand?
🧲- a filter
- a magnet
- a measuring cup
- a thermometer
a magnet
Hint: Iron is attracted to magnets. Sand is not.
Answer key
- 1. Run a magnet through the dry mix to pull out the iron → Add water and stir until the salt dissolves → Pour it through a filter to catch the sand → Let the water evaporate to leave the salt
- 2. a filter, like a coffee filter
- 3. Powder C
- 4. size
- 5. stirring
- 6. yes, if the water evaporates the sugar is left
- 7. 💧 soluble: drink crystals, table salt, baking soda · 🚫 insoluble: uncooked rice, sand, pebbles
- 8. a solution that can't dissolve any more solute
- 9. Heat the salt water → Water evaporates and the salt stays behind → The vapour touches a cold surface and condenses → Drops of pure water drip into a clean cup
- 10. a magnet
Want more than 10 questions?
In Gradelings the questions change every time and adjust to your child, with hints and kind feedback.