I'm extremely confused on my homework right nowWe're learning how to calculate density and science and I don't get it; it incorporates some math which I'm not very good at xDSo if you can help me with this work, it would be much appreciated, you have no ideaI have to calculate the density:1Calculate the density of a substance with a mass of 200 g and a volume of 40cm3I have to answer it in a complete sentence towards the end.2Calculate the mass of 100cm3 of silver (density 10.5 g/ cm3)3Calculate the volume of 270 g of aluminum; which has a density of 2.7 g/cm3Please help me, I'm clueless.
1: density is mass divided by volume (as you can see by looking at your density equation in the second question) so take your mass (200g) and divide by volume (40cm3) to get 200g/40cm3, simplify to get 5g/cm3 2: generally if you're given a standard number for something (such as the density of silver 10.5 g/cm3) and another related number you can generally just mush them together to figure it outRemember that units (such as cm3) act just like numbers and can be multiplied or dividedIn this case you want to get rid of the cm3 to get the mass (in grams)So multiply your 100cm3 by 10.5 g/cm3The cm3 will cancel out and you get 1050g 3: this works similarly only this time you want to get rid of the mass (g) to get the volume (cm3)Because the equation is simply a relationship between two things (2.7 grams of aluminum takes up 1 cm3 of space.) you can flip the equation upside down and it still worksso you get 1cm3/2.7gThen multiply the 270g to get rid of g and leave only your volume (in cm3) so you get (270g1cm3)/(2.7g)This comes out to 100cm3.
