Dissolving

Do all solids dissolve in water?

• Yes

• No

What are the ways to separate solids that don't dissolve?

• Decanting

• Sieving

• Filtering

• Separating

Which of the below statements are true?

• A sieve works by holding the large solid pieces in the sieve so the water can escape the holes.

• You can't separate fine sand and water using a sieve.

• If the solid sinks, you can decant it by pouring the liquid off the top.

• If the solid is suspended in the water, you can sieve or filter it.

What is a solution?

• A solution is a liquid form of a solid substance.
• A solution is a type of gas.
• A solution is a mixture of only one substance.
• Some solids disappear when you put them in water - this is a solution.

How do you get the solid in a solution out again?

• Heat the solution to a higher temperature
• Shake the solution vigorously
• Use methods such as filtration, evaporation, or crystallization.

• Add more solid to the solution

What happens to a solution when the water evaporates?

• The solute becomes less concentrated.
• Instead of removing the solid from the liquid you are removing the water from the solid.

• If you leave a solution in a warm place the water will evaporate leaving the dissolved solid in the bottom of the dish.

• The solute becomes a gas.

Tags

NGSS.MS-PS1-4

How can you make water pure?

• Adding sugar to water
• Evaporating as water vapour

• Condensing on a cold surface

• Exposing water to sunlight

Tags

NGSS.MS-PS3-3

What happens when water evaporates from a solution?

• The solution becomes less dense.
• The solution becomes more diluted.
• The solution becomes more viscous.
• Liquid particles that escape become vapour or gas.

Tags

NGSS.MS-ESS2-4

NGSS.MS-PS1-4

How can you dissolve solids faster?

• Increase temperature, stir, crush, or increase surface area
• Decrease temperature
• Leave it undisturbed
• Use a smaller container

Is there a limit to how much solid a liquid will dissolve?

• Yes, there is a limit to how much solid a liquid will dissolve.
• The limit is determined by the color of the solid.
• The limit depends on the temperature of the liquid.
• No, there is no limit to how much solid a liquid will dissolve.