Question

Help please hard chemistry chart (btw I know this is math)
Need help with Data Table 2
In Data table-2, you are given 8 different masses and volumes for metals A-B-C. These are values that will provide (x,y) points on your graph to show that density remains constant for each metal. Mass is plotted on the (y-axis) and volume is plotted on the (x-axis). The slope of each line, y/x which will be mass/volume will indicate the different densities for metals A,B, and C.

Your lab value for denisty is your (E) value; while the actual value in a table of values is your (A) value. You will use these values to calculate the experimental error:
(E-A)/A

Answer 1

What is the required?

Answer 2

For each metal, plot the points as (volume, mass) on a cartesian plane and show they tend to fit a straight line. Calculate the slope which is mass/volume which will give you the density of your metal.

Answer 3

Hi @3mar

Answer 4

I am back

Answer 5

Welcome back!
\[\Huge\color{red}ツ\]

Answer 6

Okay so seeing what you said, I am about to plot the points because that is step one right?

Answer 7

Could you give me 2 min, please?

Answer 8

Of course, brother =)

Answer 9

Thank you for your patience.

Answer 10

=)

Answer 11

@3mar available yet?

Answer 12

@mww Help please, I think @3mar brother got caught up in something

Answer 13

did you plot the points?

Answer 14

Lemme do that now

Answer 15

Do I plot all 8 points for the 3 metals?

Answer 16

you do them on separate graphs then draw a line of best fit through them and calculate the slopes.

Answer 17

remember volume is the x axis and mass the y axis.

You can also use your table to do a mass/volume calculation for each entry and then average these to see how well your slope line compares to this average. Should be very close.

Answer 18

Here you go, first step is done. I graphed all the points

Answer 19

ok do you know how to draw the trendline and calculate the slope?

Answer 20

I am so sorry for late!
I was doing something for my mother!

I apology!

Answer 21

There is a way to do it on Excel. you can have x and y columns to enter your data then --> insert --> charts --> scatterplot. under chart elements, add trendline, and under trendline options, select 'set intercept' to 0.0 and check 'show equation'.

Answer 22

Okay so do that and then tell you the equation?

Answer 23

well the slope is inherent in the equation it spits out. for a line y = a + bx has the slope being the coefficient of x, which is the b value.

Answer 24

I dont have excel

Answer 25

@3mar

Answer 26

yes, sister!

Answer 27

help please , look I graphed it

Answer 28

so where did you reach?

Answer 29

I graphed the points on the graph by (volume,mass).
I don't know the next step.

Answer 30

Did you do a table or just points?

Answer 31

just points, don't you see it above

Answer 32

:(

Answer 33

I mean: table like that is better than just points.
Let me show up my points!

https://www.desmos.com/calculator/kwn5jv2n5v

Answer 34

Oh so instead of graphing them make a table

Answer 35

That is right!
By doing so, you will get the line fitting easy as I have illustrated!

Did you get the idea?

Answer 36

Yes so do I do the rest of the metals?

Answer 37

Yes, individually of commonly, as you wish!

familiar or need a push?

Answer 38

@3mar

Answer 39

Here you go @3mar brother

Answer 40

You are Awesome!
Ma Sha' Allah!

Then did you get the regression/line fitting or your three tables?

Answer 41

What do you mean, can you explain more. I am not quite understanding

Answer 42

I did for metal A, and you did for B and C.
right?

What is the best line fit did you get for B and C?

Clear now?

Answer 43

Line fit so see the points>?

Answer 44

How much the line fits the points?
Look at \(r^2\) under the relation (y1~ax1+b)

got it?

Answer 45

Can you give me an example. sorry brother I am confused

Answer 46

It says r^2 =1

Answer 47

That is awesome!

That means the line is definitely fits the input data 100%

Answer 48

So for both of them it fits?

Answer 49

Is \(r^2=1\) for both?

Answer 50

no

Answer 51

so which one has \(r^2=1\), and what about the other one?

Answer 52

metal C has r^2=1

Answer 53

Very good!
and meta A that I have done is 0.991
what about B?

Answer 54

0.966

Answer 55

That is good!

So:
A = 0.991
B = 0.996
C = 1

Right?

Answer 56

right

Answer 57

What would go in the table now

Answer 58

What do you mean?

Answer 59

Did you not do tables for metals A, B and C?

Answer 60

So what do I insert in the empty spaces

Answer 61

I think you will write the mean of masses and volumes for all metals.