Chemical/Physical Change
Is melting ice a chemical or physical change?
Physical
What state of matter is air?
Gas
Is salt water a mixture or pure substance?
Mixture
What must you wear to protect your eyes?
Safety Goggles
What method separates solids from liquids?
→ Filtration
Burning wood is what type of change?
Chemical
Particles in a solid are:
A) Far apart
B) Close together and fixed
C) Moving freely
B
What do we call a substance that is dissolved in a solution?
Solute
Should you taste chemicals in the lab?
No!
What technique separates salt from water?
→ Evaporation
Give ONE sign of a chemical change
Gas produced / colour change / temperature change / precipitate
Name the change from liquid → gas
→ Evaporation / boiling
A student mixes sand and water. After sitting for a while, the sand settles at the bottom.
Suspension
A student needs to measure 50 mL of liquid accurately.
Which piece of equipment should they use?
Measuring Cylinder
What tool is used in filtration?
Filter paper
Why is dissolving sugar in water NOT a chemical change?
No new substance formed
A balloon with a small amount of air is placed in hot water and expands.
Using the particle model, explain why the balloon expands.
What is the solute in salt water?
Salt
What object is the same shape as a pringles can and is used for measuring accurate volumes of liquids?
Measuring cylinder
A mixture contains sand and salt dissolved in water.
Describe how you would separate the sand.
Filtration
A solid dissolves in water, then when heated produces a gas and a new solid forms.
Which changes are physical and which are chemical? Justify your answer.
Compare particle movement in liquids vs gases
→ Liquids: slide past each other; Gases: move freely and quickly
Explain the difference between solution and suspension
→ Solution = fully dissolved; Suspension = particles settle
What equipment is required for an experiment heating water?
Milk looks evenly mixed, but its particles do not settle and cannot be removed by filtration.
What type of mixture is milk?