Mixture
What do we call two or more substances combined without forming a new substance?
What is a mixture?
What do we call characteristics of matter that can be observed or measured?
What are physical properties?
What tool can be used to remove iron filings from sand?
What is a magnet?
What do we call a mixture in which one substance dissolves in another?
What is a solution?
What type of change occurs when no new substance is formed?
What is a physical change?
In a mixture, do the substances keep their own physical properties or become completely new substances?
What is keeping their own physical properties?
What physical property tells how much matter an object contains?
What is mass?
What method separates solid particles from a liquid using a filter?
What is filtering?
In saltwater, what substance is the solute?
What is salt?
What type of change occurs when a new substance is formed?
What is a chemical change?
Raisins, peanuts, and cereal are mixed together. What type of mixture is this?
What is a mixture of solids?
What physical property tells how much space an object takes up?
What is volume?
What process can be used to recover salt from saltwater?
What is evaporation?
In saltwater, what substance is the solvent?
What is water?
Is melting an ice cube a physical change or a chemical change?
What is a physical change?
A student mixes sand and iron filings. Are they able to separate the two substances? If so, how?
Yes. They can use a magnet to remove the iron filings.
Is the color of a substance a physical property or a chemical property?
What is a physical property?
A student has sand, salt, and iron filings. What should the student use first to separate one of the substances?
A magnet to remove the iron filings.
When salt dissolves in water, does the salt disappear or remain in the solution?
It remains in the solution, even though we cannot see the individual salt crystals.
A piece of iron develops rust. Is this a physical or chemical change? Explain.
A chemical change because rust is a new substance.
A student combines three different materials. The materials can still be seen and separated. What does this tell you about the mixture?
The substances keep their identities and can be separated using physical methods.
A student adds sand to a beaker of water. Does the mass of the sand disappear when it is mixed with water? Explain.
No. The sand still has mass even when mixed with water.
A student wants to recover iron filings, sand, salt, and water from a mixture. Describe the processes they could use.
Use a magnet for iron, dissolve the salt in water, filter out the sand, and distill the saltwater to collect the water and salt separately.
A student dissolves salt in water and wants to recover the salt. What should the student do, and why does it work?
Evaporate the water. The water becomes a gas, leaving the salt behind.
A student mixes peanuts, raisins, and cereal using a spoon. Explain why this is a physical change rather than a chemical change.
No new substance forms. Each ingredient keeps its physical properties and can still be separated.