Need some help with my decision (1 Viewer)

[jaycoo]

Okay y'all I've chosen general maths for yr 11 next year and I'm also doing chemistry. Maths is definitely not my strength but science is. However, I'm blank whenever the teacher brings in maths into the science topic. Will general maths be a waste of time or will it help me with chemistry?


Thanks

 

[HeroicPandas]

Re: Need some help with my decision SKDJFBSDKJFNJSSDBISFSDZHJKSDCDBKNV

Chemistry doesn't need maths for the calculation questions, its just numbers and calculator. The most most u'll ever do is the re-arrangement of something to find it

example:

This is a great formula - say they gave u the mass and moles of an unknown compound (say, mass = 1.22 grams and moles = 0.605 mol) and they tell u to find the molar mass, all u need to do is make MOLAR MASS the subject, sub in 'm' and 'n' and u'll get the answer

u dont even have to do maths (as a subject) to do calculations in chemistry AND u'll only struggle if u dont understand chemistry. There is not a lot of maths in chemistry, it just understanding how to use formulas and u will only know how to use them if u understand chemistry

 

[jaycoo]

Re: Need some help with my decision SKDJFBSDKJFNJSSDBISFSDZHJKSDCDBKNV

Chemistry doesn't need maths for the calculation questions, its just numbers and calculator. The most most u'll ever do is the re-arrangement of something to find it

example:

This is a great formula - say they gave u the mass and moles of an unknown compound (say, mass = 1.22 grams and moles = 0.605 mol) and they tell u to find the molar mass, all u need to do is make MOLAR MASS the subject, sub in 'm' and 'n' and u'll get the answer

u dont even have to do maths (as a subject) to do calculations in chemistry AND u'll only struggle if u dont understand chemistry. There is not a lot of maths in chemistry, it just understanding how to use formulas and u will only know how to use them if u understand chemistry

oh so it's kind of like speed, distance and time? feeling more confident!

thanks

 

[HeroicPandas]

Re: Need some help with my decision SKDJFBSDKJFNJSSDBISFSDZHJKSDCDBKNV

oh so it's kind of like speed, distance and time? feeling more confident!

thanks

yeh like that. general maths will suffice, helps u with some rearranging equations and subbing in variables - chemistry calculations is about applying formulas CORRECTLY

 

[jaycoo]

Re: Need some help with my decision SKDJFBSDKJFNJSSDBISFSDZHJKSDCDBKNV

yeh like that. general maths will suffice, helps u with some rearranging equations and subbing in variables - chemistry calculations is about applying formulas CORRECTLY

what happens if i drop it in yr 12? will i survive?

 

[nerdasdasd]

what happens if i drop it in yr 12? will i survive?

You will survive. Year 12 chemistry maths is quite basic.

 

[jaycoo]

You will survive. Year 12 chemistry maths is quite basic.

how basic though? right now i get c's in maths. please give me examples!! i really need to know. omg pleeeeaase

 

[HeroicPandas]

Example: Calculate the number of moles of 5 grams of magnesium (use the periodic table)

 

[jaycoo]

Example: Calculate the number of moles of 5 grams of magnesium (use the periodic table)

Ok so would you go:

n=24.305/5
n=4.861

I have no idea. ???¿¿¿¿??? Is that correct? Slap me if I'm wrong.

 

[HeroicPandas]

Ok so would you go:

n=24.305/5
n=4.861

I have no idea. ???¿¿¿¿??? Is that correct? Slap me if I'm wrong.

n(moles) = m(mass)/M(molar mass)

so n = 5/24.31

 

[jaycoo]

n(moles) = m(mass)/M(molar mass)

so n = 5/24.31

Would you round it to 2 decimal places or..?

n=m/M
n=5/24.31
n=0.20567668
=0.21

 

[HeroicPandas]

Would you round it to 2 decimal places or..?

n=m/M
n=5/24.31
n=0.20567668
=0.21

In chemistry, its significant figures, so u look at the question and the data given, and pick out the data that U HAVE USED (in this case the 5 grams of magnesium), how many significant figures is 5? Its 1 sig fig, so ur answer should be in 1 sig fig

so n = 0 (1sf) lol

this is a bad question i shouldve done 5.0001 grams

HOWEVER, say u did a question and u used 2 values from the information given: say 0.1001grams and 0.2grams, ur final answer will be in 1 sig fig as it is the lowest

 

[jaycoo]

In chemistry, its significant figures, so u look at the question and the data given, and pick out the data that U HAVE USED (in this case the 5 grams of magnesium), how many significant figures is 5? Its 1 sig fig, so ur answer should be in 1 sig fig

so n = 0 (1sf) lol

this is a bad question i shouldve done 5.0001 grams

HOWEVER, say u did a question and u used 2 values from the information given: say 0.1001grams and 0.2grams, ur final answer will be in 1 sig fig as it is the lowest

AAAAAAHHHHHHHGGMDAKSNKSHSJ ok lol so if my answer was 1.0000025274 the sigfig would be 1. Or if I had 0.0009263 sigfig would be 0?

 

[AnimeX]

AAAAAAHHHHHHHGGMDAKSNKSHSJ ok lol so if my answer was 1.0000025274 the sigfig would be 1. Or if I had 0.0009263 sigfig would be 0?

no no, the first non-zero number is counted as the first "significant figure", for example 0.00000000002927 to one sig fig would be 0.00000000003, would not round to zero.

try these ones: correct to 2 sig fig, see how you go!

a) 1.00987
b) 0.000999
c) 1.234
d) 2.001

 

[jaycoo]

no no, the first non-zero number is counted as the first "significant figure", for example 0.00000000002927 to one sig fig would be 0.00000000003, would not round to zero.

try these ones: correct to 2 sig fig, see how you go!

a) 1.00987
b) 0.000999
c) 1.234
d) 2.001

a) 1.0099
b) 0.001000
c) 1.230
d) 2.000

man idek I just..

 

[asianese]

Correct answers:

a) 1.0
b) 1.0x10^-3
c) 1.2
d) 2.0

(all 2sf)

 

[AnimeX]

Correct answers:

a) 1.0
b) 1.0x10^-3
c) 1.2
d) 2.0

(all 2sf)

yup this, but b) is 1.0x10^-4

 

[jaycoo]

Correct answers:

a) 1.0
b) 1.0x10^-3
c) 1.2
d) 2.0

(all 2sf)

I'm just gonna go slap myself. brb guys.

 

[Menomaths]

yup this, but b) is 1.0x10^-4

b) is 1.0x10^-3

 

[asianese]

AnimeX - please count again.