HONORS CHEMISTRY – Happy use your brain day!! Can you now use what you’ve learned about density? Who is going to be your spokesperson? When is your lab going to be due? Do you need two due dates???

So here’s my measurements I got from using the ruler.
Length = 8.71 cm, Width = 4.07cm, and Height = 1.86cm. I multiplied them together and got 65.9cm3.
When I measured the block on the balance I got 38.438g.
So I took 38.438g and divided it by 65.9 cm3 and got 0.583 g/cm3

Ok yeah I forgot percent of error. I think paper white = Alpha so I’m using that one.
%E = (E – A/ A)(100)
%E = (0.583 – 0.541)(100)
%E = (0.042)(100)
%E = 4.2%

To grays: I have measured my length to be 10.16 cm, my width to be 5.37 cm, and my height to be 1.28 cm. I measured my block on the balanced and concluded it is 95.145 g. Volume is length times width times height. I multiplied the length, width, and height and got 69.8 cm cubed. The equation for density is D= m divided by V. When you plug the data in, it is D = 99.145 g divided by 69.8 cm. I plugged this into my calculator and got 1.42 g/cm cubed. I have concluded that our block is named “Epsilon”. Grays agree?

I found the mass of my clear block by using my balance, and got a mass of 70.682g. I found the volume of the block by multiplying length (8.10 cm) times width (3.10cm) times height (2.38cm). Next, I divided my mass by my volume (D=M/v) to get a density of 1.18.

Hey guys. So I was thinking, this is pretty easy right? So maybe the info. Should be due on like Thurs. and then HJ could have the email by Mon. What do you guys say?

Hey guys, hope the long weekend is going well so far! So I sent in my calculations, how I got them, and what I think they mean, but I feel like I should help more. Is there anything else I should do?

just completely disregard my previous comments bc i retyped it here

paper white block measurements:

l= 8.67 cm
w= 8.16 cm
h= 1.29 cm
V= lwh
V= (8.67cm)(8.16cm)(1.29cm)
V= 91.26 cm cubed

m= 42.238 g

D= m/V
D= 42.238 g/ 91.26 cm cubed
D= 0.46 g/ cubic cm

i think paper white is Alpha:
%error= (E-A)/A x 100
%error= (0.46 g/cm^3 – 0.541 g/cm^3) / 0.541 g/cm^3 x 100
%error= 15%

it’d be really convenient if you guys could put all the important info in one comment or maybe in comments that are right next to each other!!!!!!!!!!! im going to be paying the most attention to the last comments you guys have.

I agree with Sammy that the gray block is Epsilon.
gray block measurement:
l= 6.69 cm
w= 2.24 cm
h= 4.14 cm
V= lwh
V= (6.69 cm)(2.24 cm)(4.14 cm)
V= 62.040384 cm^3 or 62.0 cm^3

Final measurements for SK:
Grey box= epsilon
l= 7.00 cm
w= 6.40 cm
h= 1.19 cm
V= l x w x h
V= 7.00 cm x 6.40 cm x 1.19 cm
V= 53.3 cm^3
m= 77.90 g
D= m/V
D= 77.90 g/ 53.3 cm^3
D= 1.45 g/cm^3
% error = E- A/ A x 100
% error = 1.45 g/ cm^3 – 1.42 g/ cm^3 / 1.42 g/cm^3 x100
% error = 2.11 %

Out of the fifteen people that commented their data, all except two agree with this: Alpha is paper white, Beta is black, Delta is milky white, Gamma is clear, and Epsilon is gray. As of right now, that us what I’m emailing Mrs. Skinner. Any objections?

You measured it in mm Sammy not cm

are any two blocks the same size (length height and width) that are even in different colors or are they all different??

Ok so I assured my density.

I had a PAPER WHITE block and I got 0.583g/cm3.

I’d recommend we set a due date like. Now.

No, I measured it in cm. The small dashes are mm and the bigger ones are cm.

I don’t think this balance is working 🙁

Unless ive made a mistake, the density of my paper white block is 2.93 g/cm cubed.

Could you show us your math.

I believe I was right because I picked up all the colors of blocks and mine seemed the lightest.

The density of my milky white block is 0.9078 g/cm^3. Someone wanna come check if I did my sig figs correctly? idk if I did it absolutely right.

Spencer, Would I use four sig figs in this measurement?

yes, least amount of sig figs

You measured only to the mm. (to matty)

Black block= Epsilon?

Length- 12.01cm

Width- 4.01cm

Height- 1.01cm

V=lwh

V=(12.01cm)(4.01cm)(1.01cm)

V=48.6cm^3

D=m/V

D=65.82g/48.6cm^3

D=1.35g/cm^3

%error =( E-A/ A)(100)

%error= {(1.35g/cm^3 – 1.42g/cm^3) / 1.42g/cm^3}{100}

%error = -4.93%

*65.821g

So here’s my measurements I got from using the ruler.

Length = 8.71 cm, Width = 4.07cm, and Height = 1.86cm. I multiplied them together and got 65.9cm3.

When I measured the block on the balance I got 38.438g.

So I took 38.438g and divided it by 65.9 cm3 and got 0.583 g/cm3

Ok yeah I forgot percent of error. I think paper white = Alpha so I’m using that one.

%E = (E – A/ A)(100)

%E = (0.583 – 0.541)(100)

%E = (0.042)(100)

%E = 4.2%

What do u mean hj?

For my milky white block, I got 1.06 g/cm^3 as my density. I believe I did the sig figs right.

To grays: Abi, 1 m is = 100 cm. On the meter stick, there are 100 cm. they are cm not mm.

Don’t forget to estimate a place more than the smallest marks on your ruler (hundredths place)!!! (thousandths place for balance)

Matty, do you still need to check sig figs?

Hope joy, can you check mine?

okay so i have the black block and i got:

V= 7.67 cm x 8.32 cm x 1.29 cm

V= 82.320576 cm^3

V= 82.3 cm^3

m= 78.842 g

D= 78.42 g / 82.3 cm^3

D= 0.957982989 g/cm^3

D= 0.956 g/cm^3

% error= 0.957 g/cm^3 – 0.967 g/cm^3 / 0.967 g/cm^3 (x 100)

% error= -1.034126163 g/cm^3

% error= -1.03 g/cm^3

which i used betas measurement

now I got 0.8962 as the density

Good job today! Looking forward to “seeing” your answers!

For my milky white block I got a density of 0.9421 g/cm^3

To grays: I have measured my length to be 10.16 cm, my width to be 5.37 cm, and my height to be 1.28 cm. I measured my block on the balanced and concluded it is 95.145 g. Volume is length times width times height. I multiplied the length, width, and height and got 69.8 cm cubed. The equation for density is D= m divided by V. When you plug the data in, it is D = 99.145 g divided by 69.8 cm. I plugged this into my calculator and got 1.42 g/cm cubed. I have concluded that our block is named “Epsilon”. Grays agree?

I found the mass of my clear block by using my balance, and got a mass of 70.682g. I found the volume of the block by multiplying length (8.10 cm) times width (3.10cm) times height (2.38cm). Next, I divided my mass by my volume (D=M/v) to get a density of 1.18.

I guess this makes my block gamma.

i did my measurements completely wrong earlier!!!

my squarish shaped paper white block’s measurements:

l= 8.67 cm

w= 8.16 cm

h= 1.29 cm

V= 91.26 cm cubed

m= 42.238 g

0.46 g/ cubic cm

Ok so would you agree that it’s alpha or what do you think?

Here is the data for my Black block:

V= l x w x h

V= 5.87 x 11.24 x 1.22

V= 80.5 cm^3

m= 82.519 g

D= m/V

D= 82.519/80.5

D= 1.02 g/cm^3

I’m pretty sure the Black Block is Beta.

& the formulas i used were

V= l(w)h

D= m/V

% error= E-A/A (x100)

My percent error for the black block (Beta) is:

% error= (e-a)/(a) x 100

% error= (1.02-0.967)/(0.967) x 100

% error= 0.0548 x 100

% error= 5.48%

Hey guys. So I was thinking, this is pretty easy right? So maybe the info. Should be due on like Thurs. and then HJ could have the email by Mon. What do you guys say?

I think that sounds good, Rachel. Do we need to calculate the percent of error along with the other calculations?

Hey guys, hope the long weekend is going well so far! So I sent in my calculations, how I got them, and what I think they mean, but I feel like I should help more. Is there anything else I should do?

Ok so my block was black and here are my measurements:

l=9.62cm

w= 4.70cm

h= 2.57cm

Then I continued to the volume formula:

V= l x w x h

V= 9.62cm x 4.70cm x 2.57cm

V= 116.19998cm^3

V= 116cm^3

Then I measured mass on my balance:

m= 110.432g

So I continued to density:

D=m/V

D=110.432cm^2 / 116.2cm^3

D= 0.9504g/cm^3

This is closest to the Beta name(9.67g/cm^3). So I’m thinking Beta blocks are black

Here’s also my % of error

%e= e-a/a

%e= 0.9504g/cm^3 – 0.967g/cm^3 / 0.967g/cm^3 x 100

%e= 0.1016g/cm^3 x 100

%e= 10%

Also I forgot to add the unit for my density when I sent the original measurement. My density is 1.8 g/cm^3.

D=m/V

D=70.682g/59.8cm^3

D=1.8g/cm^3

I’m sorry I meant to type 1.18g/cm^3 for density!

%error= E-A/ A x100

%error=1.18g/cm^3 – 1.17g/cm^3 / 1.17g/cm^3 x100

%error= 0.855%

My block was milky white and here are my measurement:

LxWxH

4.61cmx 5.59cmx 2.39cm= 61.6 cm^3

I got the mass was 65.125 g

D=m/V

D=65.125g/ 61.6 cm^3= 1.06 g/cm^3

% of error= E-A/A x100

% of error= 1.06-1.17/1.17 x100 =-9.40%

So I think the milky white blocks may be Gamma.

I had the clear block:

V=L*W*H

V= 9.60cm*7.10cm*1.25cm

V= 85.2cm^3

And I got the mass to be 99.750g

D=m/V

D=99.750g/85.2cm^3

D= 1.17g/cm^3

So I’m pretty sure the clear block are Gamma

The Clear Blocks are Gamma.

my measurements:

length: 8.41cm

width:5.61cm

height: 1.21cm

Volume: 57.087 921cm^3

mass: 67.123g

D= m÷V

D= 67.123g ÷ 57.087 921cm^3

D= 1.17578g/cm^3

D= 1.18g/cm^3

%E= [(E-A)÷A]×100

%E= [(1.18-1.17)÷1.17]×100

%E= 0.8%

I think all my sig figs are correct but I can’t rely on my own mind!! 😂

My measurements above were:

l=9.60cm

w= 7.10cm

h=1.25cm

My percent error is:

% error= e-a/a *100

% error = 1.17g/cm^3/1.17g/cm^3 (Gamma)

=0%

I had a white block and the dimensions were:

L= 14.24 cm

W= 3.35 cm

H= 1.29 cm

I used the volume formula to get 61.5 cm^3 for the volume.

V= L*W*H = (14.24 cm) * (3.35 cm) * (1.29 cm) = 61.5 cm^3

I massed the block and got a mass of 31.910 g.

V= 61.5 cm^3

M= 31.910 g

I used the density formula to get 0.520 g/cm^3 for the block’s density.

D= M / V = (31.910 g) / (61.5 cm^3) = 0.520 g/cm^3

D= 0.520 g/cm^3

So I believe the paper white blocks are Alpha.

So using the percent error formula I found my percent error for the Alpha block to be: -3.88%

Percent error = Experimental – Accepted / Accepted * 100

Percent error = (0.520 g/cm^3) – (0.541 g/cm^3) / (0.541 g/cm^3) * 100

Percent error = -3.88%

Here are my final measurements and calculations so Hope Joy can have a more organized set of data to turn in. Sorry for so many comments!

Measurements:

Mass=70.682g

Length=8.10cm

Width=3.10cm

Height=2.38cm

Calculations:

V=lwh

V=(8.10cm)(3.10cm)(2.38cm)

V=59.8cm^3

D=m/V

D=70.682g/59.8cm^3

D=1.18g/cm^3

%error=experimental-accepted/accepted

%error=1.18g/cm^3 – 1.17g/cm^3 / 1.17g/cm^3

%error=0.855%

Also, My block is clear and according to my calculations is gamma.

Final Calculations for HJ:

My block is the color gray.

l=10.16 cm

w=5.37 cm

h=1.28 cm

m=95.145 g

V= l x w x h

V= 10.16cm x 5.37cm x 1.28cm

V= 69.836cm^3

D=m/V

D= 99.145g/69.836cm^3

D= 1.42g/cm^3.

Based on my calculations, my block is named “Epsilon” because the density of Epsilon is 1.42g/cm^3 and I got 1.42g/cm^3 in my calculations.

%error=E-A/A

%error=1.42g/cm^3-1.42g/cm^3 / 1.42g/cm^3

%error= 0%

just completely disregard my previous comments bc i retyped it here

paper white block measurements:

l= 8.67 cm

w= 8.16 cm

h= 1.29 cm

V= lwh

V= (8.67cm)(8.16cm)(1.29cm)

V= 91.26 cm cubed

m= 42.238 g

D= m/V

D= 42.238 g/ 91.26 cm cubed

D= 0.46 g/ cubic cm

i think paper white is Alpha:

%error= (E-A)/A x 100

%error= (0.46 g/cm^3 – 0.541 g/cm^3) / 0.541 g/cm^3 x 100

%error= 15%

it’d be really convenient if you guys could put all the important info in one comment or maybe in comments that are right next to each other!!!!!!!!!!! im going to be paying the most attention to the last comments you guys have.

Final Measurements for HJ:

black block= beta

l= 7.67 cm

w= 8.32 cm

h= 1.29 cm

V=lwh

V= 7.67 cm x 8.32 cm x 1.29 cm

V= 82.320576 cm^3

V= 82.3 cm^3

m= 78.842 g

D= m/V

D= 78.42 g / 82.3 cm^3

D= 0.957982989 g/cm^3

D= 0.956 g/cm^3

% ERROR= (E-A)/A x 100

% error= (0.957 g/cm^3 – 0.967 g/cm^3) / 0.967 g/cm^3 x 100

% error= -1.034126163 g/cm^3

% error= -1.03 g/cm^3

Final Measurements for HJ:

black block= beta

l= 7.67 cm

w= 8.32 cm

h= 1.29 cm

V= lwh

V= 7.67 cm x 8.32 cm x 1.29 cm

V= 82.320576 cm^3

V= 82.3 cm^3

m= 78.842 g

D= m/V

D= 78.42 g / 82.3 cm^3

D= 0.957982989 g/cm^3

D= 0.956 g/cm^3

% error=(E-A)/A x 100

% error= (0.957 g/cm^3 – 0.967 g/cm^3) / 0.967 g/cm^3 x 100

% error= -1.034126163 g/cm^3

% error= -1.03 g/cm^3

I agree with Sammy that the gray block is Epsilon.

gray block measurement:

l= 6.69 cm

w= 2.24 cm

h= 4.14 cm

V= lwh

V= (6.69 cm)(2.24 cm)(4.14 cm)

V= 62.040384 cm^3 or 62.0 cm^3

m= 97.366 g

D= m/V

D= 97.366 g/62.040384 cm^3

D= 1.56939712 g/cm^3 or 1.57 g/cm^3

This density is closest to Epsilon with a percentage error of 10.6%

% error= (e-a)/a x 100

% error= (1.57 g/cm^3 – 1.42 g/cm^3)/1.42 g/cm^3 x 100

% error= 10.56338% or 10.6%

Final measurements for SK:

Grey box= epsilon

l= 7.00 cm

w= 6.40 cm

h= 1.19 cm

V= l x w x h

V= 7.00 cm x 6.40 cm x 1.19 cm

V= 53.3 cm^3

m= 77.90 g

D= m/V

D= 77.90 g/ 53.3 cm^3

D= 1.45 g/cm^3

% error = E- A/ A x 100

% error = 1.45 g/ cm^3 – 1.42 g/ cm^3 / 1.42 g/cm^3 x100

% error = 2.11 %

Final Measurements!

milky white block= delta

l= 6.60 cm

w= 3.95 cm

h= 2.55 cm

m= 59.583 g

V= l x w x h

V= 6.60 cm x 3.95 cm x 2.55 cm

V= 66.5 cm^3

D= m/V

D= 59.583 g / 66.5 cm^3

D= 0.896 g/cm^3

%E= (E-A) / A x 100

%E= (0.896 g/cm^3 -0.910 g/cm^3) / 0.910 g/cm^3 x 100

%E= -1.54%

helloooo

how many people should i have information for?

Here is the data for the black block:

V = l x w x h

V = 5.87 cm x 11.24 cm x 1.22 cm

V= 80.5 cm^3

m = 82.519 g

D = m / V

D = 82.519 g / 80.5 cm^3

D = 1.02 g / cm^3

% error = (e-a) / (a) x 100

% error = (1.02 – 0.967) / (0.967) x 100

% error = 0.0548 x 100

% error = 5.48 %

I’m think that the black block falls under Beta.

Out of the fifteen people that commented their data, all except two agree with this: Alpha is paper white, Beta is black, Delta is milky white, Gamma is clear, and Epsilon is gray. As of right now, that us what I’m emailing Mrs. Skinner. Any objections?

That sounds good, HJ.

https://docs.google.com/document/d/1lwCh6SeEi9fkftDM1XD7ZIqKKDlF3SxtZvqb8gssG94/edit?usp=sharing

final

Milky White Block Measurements- *Delta*

————

l= 7.21cm

w= 4.50 cm

h= 1.22 cm

V=lwh = 7.21 cm × 4.50 cm × 1.22 cm

V= 39.58 cm^3

———–

m= 36.630 g

———–

D= m/V

D= 36.630 g/ 39.58 cm^3

—————

D= 0.925 g/cm^3

—————

% error= (e-a)/ (a) × 100

% error= (0.925-0.910)/ 0.910 × 100

% error= (0.015/ 0.910) × 100

% error= (0.0164) × 100

————

% error= 1.64%

————