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lisov135 [29]
3 years ago
7

Why are standards needed for measured quantities?

Chemistry
2 answers:
aleksandr82 [10.1K]3 years ago
8 0

It's imperative to have standard units for measuring quantities with the goal that the quantities are uniform.

Further Explanation:

measuring quantities:

In a physical setting an estimation instrument might be checked to estimating substances of a particular physical amount. In such a setting the particular physical amount is known as a deliberate amount. The synonymous thought "noticeable" regularly is utilized with regards to quantum mechanics.  

Standard units:  

which means of standard unit alludes to a unit of specific arrangement of units of estimation called the standard framework (versus the decimal measuring standard). The standard framework incorporates the standard units of the foot, the pound (mass), and the gallon.  

Standard units are utilized in estimation:  

A standard unit of estimation is a quantifiable language that enables everybody to comprehend the relationship of the article with the estimation. It is communicated in inches, feet, and pounds, in the United States, and centimeters, meters, and kilograms in the decimal standard for measuring.  

Techniques for Measurement:  

Direct Method of Measurement, In this technique for estimation, the obscure amount is straightforwardly contrasted and the standard amount. The consequence of the amount is communicated in number. It is the most widely recognized strategy for estimating the physical amounts like length, temperature, weight, and so on.

Subject: chemistry

Level: High School

Keywords: measuring quantities, Standard units, Standard units are utilized in estimation, Techniques for Measurement.

Related links:

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Alex3 years ago
4 0
In chemistry the need for standards when measuring quantities are in place for accurate measurement that is recognized world wide. This way, no matter what language people use, they will always understand there standards. 
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9. Sodium reacts with water to produce sodium hydroxide and hydrogen gas, as shown below.
saveliy_v [14]

Answer:

B

Explanation:

2Na + 2H2O2==NaOh + H2

184/23=x/18

x=(184×18)/23

x=144g

4 0
3 years ago
Suppose of potassium sulfate is dissolved in of a aqueous solution of sodium chromate. Calculate the final molarity of potassium
dimulka [17.4K]

Answer:

This question is incomplete, here's the complete question:

<em><u>"Suppose 0.0842g of potassium sulfate is dissolved in 50.mL of a 52.0mM aqueous solution of sodium chromate. Calculate the final molarity of potassium cation in the solution. You can assume the volume of the solution doesn't change when the potassium sulfate is dissolved in it. Round your answer to 2 significant digits."</u></em>

Explanation:

Reaction :-

K2SO4 + Na2CrO4 ------> K2CrO4 + Na2SO4

Mass of K2SO4 = 0.0842 g, Molar mass of K2SO4 = 174.26 g/mol

Number of moles of K2SO4 = 0.0842 g / 174.26 g/mol = 0.000483 mol

Concentration of Na2CrO4 = 52.0 mM = 52.0 * 10^-3 M = 0.052 mol/L

Volume of Na2CrO4 solution = 50.0 ml = 50 L / 1000 = 0.05 L

Number of moles of Na2CrO4 = 0.05 L * 0.052 mol/L = 0.0026 mol

Since number of moles of K2SO4 is smaller than number of moles Na2CrO4, so 0.000483 mol of K2SO4 will react with 0.000483 mol of Na2CrO4 will produce 0.000483 mol of K2CrO4.

0.000483 mol of K2CrO4 will dissociate into 2* 0.000483 mol of K^+

Final concentration of potassium cation

= (2*0.000483 mol) / 0.05 L = 0.02 mol/L = 0.02 M

8 0
3 years ago
Consider the following data for five hypothetical elements: Q, W, X, Y, and Z. Rank the elements from most reactive to least rea
Natalka [10]

Answer:

Y, Q, W, Z and X

Y > Q > W > Z > X

Explanation:

To know the most reactive element, the element will be able to displace other metal in it compound. We also have to observe if the reaction occur. If the reaction didn't occur, that means the element is not reactive than the metal found in the other reactant. Invariably their will be no displacement.

Q + w+ Reaction occurs

Q element displace the metal w in it compound . This means Q is more reactive.

x +z+ No reaction

No reaction here. This means x is less reactive than z as it couldn't displace z in it compound.

w + z+ Reaction occurs

w is more reactive than z as it displaces z in it compound.

Q+ + Y Reaction occurs

Y is more reactive than Q as it displaces Q in it compounds.

Therefore, the most reactive to the least reactive is arrange as follows.

Y, Q, W, Z and X

8 0
3 years ago
Suppose a mercury thermometer contains 3.250g of mercury and has a capillary that is 0.180mm in diameter.. How far does the merc
Helga [31]
1) You need to get volume of both temperatures by using first attached formula V= Mass/DensityV_1 = (3.250 g)/(13.596 g/(cm^3)) = .2390 cm^3&#10;At 25 degrees C (V_2e have:&#10;&#10;V_2  = (3.250 g)/(13.534 g/(cm^3)) = .2401 cm^3

2) Using the second formula you get the height of 0 degree 
h = V/(pi * r^2)&#10;&#10;&#10;h_1 =(.2390 cm^3)/(pi*(.009 cm)^2)  = 939.2 cm

(radius in cm is (0.180 mm) / 2 * (1 cm)/(10 mm) or .009 cm

3) Then with h1 you can easily get the height of 25 degrees 
h_2 =(.2401 cm^3)/(pi*(.009 cm)^2) = 943.5 cm

 Subtract 943.5 cm - 939.2 cm, and obtain a rise in mercury height of 4.3 cm

5 0
3 years ago
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