Changes

| style="height:20px; width:300px; text-align:center;" |'''A [[Volume (Space)|volume]] of 6.35x10^-3m³ [[Aluminium]] and 4.10x10^-3m³ [[Magnesium ]] are [[alloy]]ed together. Given the density of [[Aluminium]] is 2700kgm^-3 and the density of [[Magnesium]] is 2700kgm1700kgm^-3 then calculate the density of the [[alloy]]'''. | style="height:20px; width:300px; text-align:center;" |'''A 200,000cm[[Volume (Space)|volume]] of 4.9x10^-3m³ [[Volume (Space)|volumeCopper]] of and 1.1x10^-3m³ [[airZinc]] has a are [[massalloy]] ed together. Given the density of 245g. Calculate [[Copper]] is 8900kgm^-3 and the density of [[airZinc]] correct to two is 7100kgm^-3 then calculate the density of the [[Significant Figures|significant figuresalloy]]'''.

[[MassCopper]] [[Volume (Space)|volume]] = 245g 4.9x10^-3m³ [[Copper]] [[Density]] = 08900kgm^-3 [[Zinc]] [[Volume (Space)|volume]] = 1.245kg1x10^-3m³ [[Zinc]] [[Density]] = 7100kgm^-3

*<math>\rho = \frac{\rho_{Al}V_{Al}+\rho_{Mg}V_{Mg}}{VV_{Al}+V_{Mg}}</math>

*<math>\rho = \frac{m\rho_{Cu}V_{Cu}+\rho_{Zn}V_{Zn}}{VV_{Cu}+V_{Zn}}</math>

*<math>\rho = \frac{08900\times 4.9 \times 10^{-3} + 7100\times 1.2451 \times 10^{-3}}{04.9 \times 10^{-3} + 1.21 \times 10^{-3}}</math>

*<math>\rho = 1.225kg/m8600kgm^{-3}</math>

<math>\rho \approx 1However, this assumes that the total [[Volume (Space)|volume]] of the [[object]] is simply the [[sum]] of the two [[Volume (Space)|volumes]] which is not necessarily the case due to the way different sized [[particle]]s form a [[lattice]].2kg/m^3</math>