Gunpowder is a formulation of potassium nitrate, charcoal and sulphur in the ratio 15 : 3 : 2 What is meant by the term “formulation” [2]
Calculate the mass of charcoal in 40g of gunpowder [1]

What stress will shift the following equilibrium system to the left? n2(g) + 3h2(g) ⇌ 2nh3(g) adding more n2(g) adding more nh3(g) increasing the pressure of the system reducing the volume of the container

When the mercury level in a barometer decreases that atmospheric pressure has

An engineer decides to use a slightly weaker material rather than a stronger material, since she knows that the stronger material can break suddenly. this is an example of what? a choosing a material that will show warning before it fails b using composite materials that combine strength c using a material for multiple applications d using design techniques that increase efficiency and reduce cost