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Debora [2.8K]
3 years ago
14

The degree to which a measurement approaches a standard value is _____. accuracy

Chemistry
2 answers:
levacccp [35]3 years ago
7 0
You forgot one...and that happens to be the answer---> Accuracy
Mamont248 [21]3 years ago
4 0

Answer:

accuracy

Explanation:

The close a measured value is to a standard accepted value the more accurate the measurement is. For example, 1 liter of milk is given and its volume is measured twice. The two measured volumes are 99 ml and 98 ml respectively. Here the former measured value is more accurate than the later measurement.

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How does a phase change from solid to liquid occur in a substance?
Alex

Answer:

see below

Explanation:

1. Heat energy is added to the substance, weakening the electrical attraction between molecules.

2. Both the melting point and boiling point are lower.

3. dipole

4. Water and ethanol have different molecular structures.

5. The lone pairs of electrons in the oxygen atom causes the molecule to be bent; the oxygen atom has a partial negative charge, while the hydrogen atoms have partial positive charges.

[quizlet: captncrun]

4 0
2 years ago
When 25.0 g of ch4 reacts completely with excess chlorine yielding 45.0 g of ch3cl, what is the percentage yield, according to c
Ber [7]

Taking into account definition of percent yield, the percent yield for the reaction is 57.08%.

<h3>Reaction stoichiometry</h3>

In first place, the balanced reaction is:

CH₄ + Cl₂ → CH₃Cl + HCl

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

  • CH₄: 1 mole
  • Cl₂: 1 mole
  • CH₃Cl: 1  mole
  • HCl:  1 mole

The molar mass of the compounds is:

  • CH₄: 16 g/mole
  • Cl₂: 70.9 g/mole
  • CH₃Cl: 50.45 g/mole
  • HCl:  36.45 g/mole

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

  • CH₄: 1 mole ×16 g/mole= 16 grams
  • Cl₂: 1 mole ×70.9 g/mole= 70.9 grams
  • CH₃Cl: 1 mole ×50.45 g/mole= 50.45 grams
  • HCl: 1 mole ×36.45 g/mole= 36.45 grams

Mass of CH₃Cl formed

The following rule of three can be applied: if by reaction stoichiometry 16 grams of CH₄ form 50.45 grams of CH₃Cl, 25 grams of CH₄ form how much mass of CH₃Cl?

mass of CH_{3} Cl=\frac{25 grams of CH_{4}x 50.45grams of CH₃Cl }{16 grams of CH_{4}}

<u><em>mass of CH₃Cl= 78.83 grams</em></u>

Then, 78.83 grams of CH₃Cl can be produced from 25 grams of CH₄.

<h3>Percent yield</h3>

The percent yield is the ratio of the actual return to the theoretical return expressed as a percentage.

The percent yield is calculated as the experimental yield divided by the theoretical yield multiplied by 100%:

percent yield=\frac{actual yield}{theorical yield}x100

where the theoretical yield is the amount of product acquired through the complete conversion of all reagents in the final product, that is, it is the maximum amount of product that could be formed from the given amounts of reagents.

Percent yield for the reaction in this case

In this case, you know:

  • actual yield= 45 grams
  • theorical yield= 78.83 grams

Replacing in the definition of percent yields:

percent yield=\frac{45 grams}{78.83 grams}x100

Solving:

<u><em>percent yield= 57.08%</em></u>

Finally, the percent yield for the reaction is 57.08%.

Learn more about

the reaction stoichiometry:

brainly.com/question/24741074

brainly.com/question/24653699

percent yield:

brainly.com/question/14408642

#SPJ1

5 0
2 years ago
According to recent research ice skaters are able to glide smoothly across the ice because
Anna11 [10]
Ice is constantly subliming to form a layer of water vapor
6 0
3 years ago
Which veriable should he change, measure and control (temp of water, volume of water and mass of sodium chloride that dissolve )
erma4kov [3.2K]
I would say
change: Temp
Measure: Mass
Control: Volume
7 0
3 years ago
25 pts<br> 3. Compare and contrast a dry cell with a voltaic cell by filling in the table.
Orlov [11]

Answer:

Half Cell  (1)oxidation reaction (2) redox reaction

Anode----(1)and(2) electrochemical cell at which oxidation occurs

Cathode---(1)and(2)electrochemical cell at which reduction

Electrolytes----(1)ammonium chloride------

Oxidation Reaction --- (1)in Anode(2)in Anode

Reduction Reaction----(1)in Cathode(2)in cathode

Bridge---(1)Zinc–carbon battery(2) Galvanic cell

Relative size   ------ (1)smaller--------(2)much larger

Explanation:

6 0
2 years ago
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