Step 18 of 18 · Solutions and mixtures · SC4-SOL-01
Water and density
Ice floats, salt water boils hotter, and density decides what sinks.
Learn it
Describe the unique properties of water and explain floating and sinking using density
Idea 1 of 4
Water's fixed points
Pure water melts at 0 °C and boils at 100 °C at sea level. Dissolving salt in it lowers the freezing point and raises the boiling point — which is why salt is spread on icy roads.
Know it by heart
Say each one in your head, then tap to check.
Try it
Play — nothing here is marked
A full-marks answer
A block has a mass of 60 g and a volume of 80 cm³. Calculate its density and say whether it floats in water.
3 marksBuilt one line at a time — say the next line before you reveal it
- density = mass ÷ volume(formula)
Words to know
Tap a card to flip it
Step 18 · last bit
Ready? Prove it.
A round of ten. Score 8 or more and this step is done.