Compressions are regions of high pressure due to particles being close together
rarefactions are regions of low pressure due to particles being spread further apart
Longitudinal waves are often demonstrated by pushing and pulling a stretched slinky spring
Answer:
magnetite
Explanation:
proportion of iron in haematite = 3.5/5 x 100% = 70%
proportion of iron in magnetite = 7.2/10 x 100% = 72%
Answer: d) 16.34 grams
Explanation:
To calculate the moles :
According to stoichiometry :
As 2 moles of 
are produced by= 4 moles of 
Thus 0.292 moles of are produced by= =
of
Mass of 
Thus 16.34 g of will be needed
Answer:
solubility
Explanation:
solubility is a measure of how much a substance will dissolve in a solvent.
