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jekas [21]
3 years ago
14

Complete each of the definitions with the appropriate phrase. Precision means that ___________measurements are close to_________

___ Accuracy means that___________ measurements are close to_____________
Chemistry
1 answer:
Gwar [14]3 years ago
5 0

Answer:

Precision means that <u><em>independent </em></u>measurements are close to <u><em>each other.</em></u>

Accuracy means that <u><em>independent</em></u> measurements are close to <u><em>a known or accepted value.</em></u>

Explanation:

Accuracy refers to how close the measurements of a measurement system are to the true value while precision refers to how close the measurements are to each other. In other words, accuracy is the closeness of the value of one or more independent measurements to a true value, and precision is the closeness of two or more values ​​of several measurements to each other.

Both are independent of each other, that is to say that the results in the values ​​of a measurement can be precise and not exact, and vice versa.

So:

Precision means that <u><em>independent </em></u>measurements are close to <u><em>each other.</em></u>

Accuracy means that <u><em>independent</em></u> measurements are close to <u><em>a known or accepted value.</em></u>

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Tomtit [17]

0.32 moles

You just do 14/ 44.01 (the atomic mass of carbon + oxygen's atomic massX2)

8 0
3 years ago
1 Copy and complete using the words below:
Aleks [24]

Answer:

The elements in__Group_ 0 of the Periodic Table are called the_noble__gases. They are generally __unreactive_. because they have a__full_outer shell of electrons. So they do not need to gain__lose_or share _electrons_ with other atoms.

5 0
4 years ago
8. A party-supply store sells a helium-gas
MatroZZZ [7]

Answer:

P₂= 116.7 atm

Explanation:

Here apply the Boyle's law equations that states :at constant temperature the volume of a dry mass of a gas is inversely proportional to its pressure.

This is simplified as;

P₁V₁=P₂V₂ where P is pressure and V is volume

Given that;

P₁=1

V₁=1.81 m³

P₂=?

V₂=1.55*10^-2 m³

Apply the formula

1*1.81 =P₂*1.55*10^-2 m³

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P₂= 116.7 atm

7 0
3 years ago
In Part A, you found the number of moles of product (1.80 mol P2O5 ) formed from the given amount of phosphorus and excess oxyge
n200080 [17]

Answer:

1.40 moles.

Explanation:

The balanced chemical equation for the reaction of Phosphorus and Oxygen is as follows -

4P + 5O_2 = 2P_2O_5

In Part A, the oxygen was taken in excess. So Phosphorus will be the limiting reagent.

Since, 2 moles of P_2O_5 is formed by 4 moles of P

So, for 1.8 moles of  P_2O_5 amount of required moles of P = \frac{4}{2} \times 1.80 = 3.60

In Part B, the phosphorus was taken in excess so oxygen will be the limiting reagent.

Since, 2 moles of P_2O_5 is formed by 5 moles of oxygen

So, for 1.40 moles of P_2O_5 moles of O_2 required = \frac{5}{2} \times 1.40 = 3.50

Thus as of now we have 3.60 moles of P_2O_5 and 3.50 moles of O_2.

As in the reaction of formation of P_2O_5, oxygen is the limiting reagent.

So the moles of P_2O_5 formed by the 3.50 moles of oxygen will be

P_2O_5 = \frac{2}{5} \times 3.50 = 1.40 moles.

5 0
3 years ago
Which statement describes a metallic bond? A. Electrons are mobile within a metal. B. Electrons transition from an inner shell t
k0ka [10]

A- electrons good luck

8 0
4 years ago
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