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Elodia [21]
4 years ago
13

Sammy wants to tell me how much total monthly income is going to various which of th following would be most helpful in displayi

ng this data 1. Circle graph 2. Bar graph 3. Line graph 4. Frequency table
Chemistry
1 answer:
Oxana [17]4 years ago
4 0
I think a line graph would be most appropriate in this case.
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how many grams of nahco3 (fm84.007) must be added ro 4.00g of k2co3 (fm 138.206) to give a ph of 10.80 in 500ml of water​
Anna11 [10]

Answer:

0.804g of NaHCO₃ you must add

Explanation:

pKa of HCO₃⁻/CO₃²⁻ is 10.32.

It is possible to find pH of a buffer by using H-H equation, thus:

pH = pka + log [A⁻] / [HA]

<em>Where [HA] is concentration of acid (HCO₃⁻) and [A⁻] is concentration of conjugate acid (CO₃²⁻).</em>

Moles of CO₃²⁻ = K₂CO₃ are:

4.00g ₓ (1mol / 138.206g) = 0.0289 moles CO₃²⁻

Replacing:

10.80 = 10.32 + log [0.0289] / [HCO₃⁻]

[HCO₃⁻] = 0.009570 moles you need to add to obtain the desire pH

As molar mass of NaHCO₃ is 84.007g/mol, mass of NaHCO₃ is:

0.009570 moles ₓ (84.007g / mol) =

<h3>0.804g of NaHCO₃ you must add</h3>

6 0
3 years ago
What kind of chemical reaction does the chemical equation sodium plus chlorine --&gt; sodium chloride represent?
Nuetrik [128]

Chemical reactions convert reactants to products, whose properties differ from those of the reactants. Chemical equations are a compact and convenient way to represent chemical reactions. They have the general form

Reactant(s) → Product(s)

The arrow in the equation means "changes to" or "forms." The reaction of gaseous nitrogen with hydrogen to produce ammonia, NH 3 , is represented by the chemical equation

Although there are thousands of chemical reactions, a significant number of them, especially those that are not organic reactions, can be classified according to four general patterns: combination, decomposition, displacement, and exchange.


Read more: http://www.chemistryexplained.com/Di-Fa/Equations-Chemical.html#ixzz4XjnDFUrK

8 0
3 years ago
How many meters are there for 1km
Hoochie [10]

Answer:

1000 meters

Measure of Lengths

10 millimeters (mm) = 1 centimeter (cm)

10 centimeters = 1 decimeter (dm) = 100 millimeters

100 centimeter = 1 meter (m) = 1,000 millimeters

1000 meters = 1 kilometer (km)

Explanation:

Hope this helps :)

5 0
3 years ago
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Describe two ways in which gases are similar to liquids in properties​
Nadusha1986 [10]

Answer:

they have weak intermolecular forces

7 0
3 years ago
Why is Germanium more electronegative than Calcium?<br> PLEASE HELP!!
Nina [5.8K]

Answer:

b/c the line of electronegativity pass through germanium

3 0
2 years ago
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