Question

Picture below

Answer 1

a) 2.5g * 0.0275

Answer 2

thank you

Answer 3

You need to convert 2.75% to a decimal so you divide it by 100, then you multiply it by the original weight of the bracelet to determine the amount of silver present in it

Answer 4

I hope that helps you understand these type of questions, if you have any further questions ask

Answer 5

So why do we need to convert 2.75 into a decimal? (:

Answer 6

It is because percent is just a unit that means out of 100, we convert it to % because people like big round numbers.

Just say you had 2grams of gold in a mass of 10grams to find the ratio of gold to total mass we divide to see how many times 10 will go into 2

2/10 = 0.2

Now if we have any larger amounts of mass that have the same composition of gold we can just multiply it by 0.2 to figure out how much gold is in the mass because we know it takes up 20% of its composition

If you take the ratio of say the entire mass over the entire mass, how many times 10 will go into 10
10/10 = 1
we see that the ratio is out of 1, we multiply it by 100 and we get 100% thus which makes sense

Answer 7

I probably over explained the concept it is actually pretty simple

Answer 8

Thank you veru much

Answer 9

I forgot to include units,

Just say you had 2grams of gold in a mass of 10grams to find the ratio of gold to total mass we divide to see how many times 10 will go into 2

2/10 = 0.2 grams of gold per gram of mass

if we multiply it by 100 we get percent gold present in the mass so 20%

Answer 10

When it is in percent form we lose the unit gram of gold per gram of mass and we are stuck with different units thus you need to convert back to the original units to solve your problems

Answer 11

which is just a matter of simple algebra

Answer 12

For your bracelet problem we have

x grams of gold/2.5 total mass = 0.0275grams of gold/1 grams of total mass

so,

x/2.5g = 0.0275g/1
=
x/2.5g = 0.0275g
=
2.5*(x/2.5)= 0.0275*2.5
=
x = 0.69g

Answer 13

remember you can divide anything by 1 and it wont change its value

2/1 = 2
3/1 = 3
0.222/1 = 0.222
etc..

Answer 14

Hope this helps if you have any questions please feel free to ask but I think I covered your question in good detail sorry if I was a bit wordy