10 questions per set. Your first answer counts.
Some quantities combine two measurements. Speed tells you how much distance is travelled each second.
Divide the numbers and divide the units. m/s means metres per second. The unit before the slash is on top.
A reaction can be measured using the volume of gas made, or the mass lost, in a measured time.
Keep the cubic symbol when you divide a volume by time. cm³/s is a volume each second; cm/s is a length each second.
Density describes mass per volume of a material. Mass concentration describes the mass of solute per volume of solution.
For example, 6 g of solute in 0.5 dm³ of solution gives 6 ÷ 0.5 = 12 g/dm³. Use the units given, or convert to the units required.
Acceleration tells you how quickly velocity changes. The change in velocity already has the unit m/s.
(m/s) ÷ s = m/(s × s) = m/s². Here the velocity changes by 2 m/s each second. The metres are not squared.
Follow the operation in the equation. Multiplying two units does not always leave both in the answer.
In kg × N/kg, the kg units cancel. In force × distance, N × m gives newton metres. For work done, 1 N m = 1 J.