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navik [9.2K]
3 years ago
15

Why do certain substances dissolve in water and others don't? *

Chemistry
1 answer:
ipn [44]3 years ago
7 0
<h2>Answer: <u><em>Hope this helps</em></u></h2>

Explanation:

<h3><u><em>Why do some substances dissolve in water and others don't? It has to do with the structure of the water molecule. Oxygen has a greater attraction for electrons, so the shared electrons (bonding electrons) spend more time close to oxygen then to either of the hydrogens.</em></u></h3>

<u><em></em></u>

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45.6 mL of 0.0600 M Ba(OH)2 is added to 25.0 mL of HCl of unknown concentration. What is the concentration of HCl?
Alex Ar [27]

45.6 mL of 0.0600 M of Ba(OH)_{2} is added to 25.0 mL of HCl of unknown concentration then , the  concentration of HCl is 0.032 M .

Calculation ,

Formula used : M_{1} V_{1} =  M_{2} V_{2}                 ...( 1 )

Where  M_{1}= concentration of Ba(OH)_{2}  =  0.0600 M ( given )

M_{2} = concentration of HCl = ? ( to be find )

 V_{1}= volume of Ba(OH)_{2}  = 25.0 mL  ( given )

V_{2} = volume of HCl = 45.6 mL  ( given )

Now , put the value of all volume and concentration in equation ( 1 ) we get .

0.0600 M ×  25.0 mL =  M_{2}  × 45.6 mL

M_{2}  =  0.0600 M ×  25.0 mL / 45.6 mL = 0.032 M

Therefore , concentration of  unknown concentration of HCl is 0.032 M .

to learn about concentration here ,

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7 0
1 year ago
If 97.3 L of NO2 forms measured at 35 C and 632 mm Hg. What is the percent yield?
enyata [817]
<span>a. Use PV = nRT and solve for n = number of mols O2. 
mols NO = grams/molar mass = ? 

 Using the coefficients in the balanced equation, convert mols O2 to mols NO2. Do the same for mols NO to mols NO2. It is likely that the two values will not be the same which means one is wrong; the correct value in LR (limiting reagent) problems is ALWAYS the smaller value and the reagent producing that value is the LR. 

b. 
Using the smaller value for mols NO2 from part a, substitute for n in PV = nRT, use the conditions listed in part b, and solve for V in liters. This will give you the theoretical yield (YY)in liters. The actual yield at these same conditions (AY) is 84.8 L. 

</span>and % will be 60%.
3 0
3 years ago
21. Which has a greater density: a large block of ice or a small block of iron?
irinina [24]

Answer:

I think ice !

Explanation:

its my answer

7 0
4 years ago
Read the directions and create the graph described below. You will then click the submit button and upload a picture of your gra
Alex73 [517]

The characteristics of the graphs we can find the answer on how to draw the graph

  • Scales: The x scale = 40 mb / cm paper and the y scale  = 0.05 mL / cm paper
  • Graphic attached

The graphical representation is one of the best methods to visualize the relationships between a series of experimental data and to be able to find their functional relationships.

A graphic representation has several parts

  • Find the scales.
  • Mark the values ​​on the x and y axis
  • Plot the experimental points
  • Draw the curve through the experimental points

The scales are found with the relationship between the variation of the data between the amount of paper or graph range, let's look for the scales for each axis.

x-axis

The variation of the data  Δx = Final value - initial value

Paper range, generally it is  x = 20cm (sheet size)

They indicate that the graph must start at zero, so the minimum value must be changed,

             initial value = 0

              Δx = 760 -0 = 760

             x scale  = 760/20

             x scale  = 38 mb / cm of paper

y-axis

Data range   Δy= 0.9 -0

Paper range  y= 20 cm (sheet size)

            y-scale  = 0.9 / 20

            y scale  = 0.045 mL / cm paper

One of the characteristics of the scale is that it must be comfortable for graphing, which is why it approximates the following units

Selected scales  

         x scale  = 40 mb / cm paper

         y scale = 0.05 mL / cm paper

The second part consists of marking values ​​equally spaced and facilitating readable in the two axes, see attached for a graph made in a computer program

Plot each experimental point as best as possible, there are always some approximations by the selected scales

Draw a curve that passes through most of the experimental points and those that remain outside are balanced above and below the curve, in this case the program draws a line between each point, but it is preferable to draw a smooth curve.

In conclusion with the characteristics of the graphs we can find the answer on how to draw the graph

  • x scale  = 40 mb / cm paper
  • y scale = 0.05 mL / cm paper
  • Graphic attached

Learn more about graphical representation here:

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Which procedure did early chemists use to determine which substances were elements? A. They observed the substances that made up
DaniilM [7]
C.
They broke down mixtures by chemical means.
5 0
3 years ago
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