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4 years ago

Choose the incorrect answer below concerning absolute zero.

Chemistry

2 answers:

Stells [14]4 years ago

8 0

Absolute zero is zero K (Kelvin) that is the complete absence of any molecular movement.

babymother [125]4 years ago

6 0

Answer:

. is equal to 0°C ( notice that the question is which statement is inocrrect)

Explanation:

The absolute zero corresponds to the zero of the absolute temperature scale, whose unit of measure is the Kelvin degree, (abbreviated K grade, in honor of the physicist Lord Kelvin), and its value coincides with a temperature of 273.15 ° C below zero (or −273.15 ° C) on the most daily scale of degrees Celsius or Celsius. Budini also clarified that a temperature difference of one degree Celsius is the same as a temperature difference of one degree Kelvin-

"We call absolute zero of temperature the value for which the internal movement of the atoms or molecules that constitute matter ceases. Temperature is a measure of the energy of motion of the microscopic constituents of a physical system. Therefore, one can to think that if it is possible to lower the temperature of a system then it should be possible to reach a (zero) temperature value for which there is no internal movement of its constituents. It would be a kind of frozen state of any material or system"

This means that no matter what substance, material or system is spoken of, such a system cooled to absolute temperature zero will have all its motionless constituent particles, there will be no internal energy of motion.

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A pure substance could be either an element or a compound true or false?

Zanzabum

Answer:

True

Explanation:

Both work because an element would be pure and compounds can be split into elements. This will work unless the substance isnt chemcially pure, but in this case it is so the answer would be true.

3 0

3 years ago

What factors affect water quality?In a typical drinking-water treatment process, ____________________ is when air is forced thro

ki77a [65]

Aeration is the answer to your question

3 0

4 years ago

For each row in the table below, decide whether the pair of elements will form a molecular compound held together by covalent ch

maw [93]

Answer:

1- yes

HBr--hydrogen bromide

2- no

BaBr₂----barium bromide

3- yes

NCl----- nitrogen chlorine

5 0

3 years ago

4.2 g of 1,4-di-t-butyl-2,5-dimethoxybenzene (250.37 g/mol) were synthesized by reacting 10.4 mL of t-butyl alcohol (MW 74.12 g/

nalin [4]

Answer:

Percentage yield of 1,4-di-t-butyl-2,5-dimethoxybenzene is 41.40%.

Explanation:

Here, in the reaction sulfuric acid is playing the role of catalyst by donating its proton in initial stage of the reaction and in the end of the reaction the proton is returned back to sulfuric acid.

Mass = Density × Volume

Mass of t-butyl alcohol = $0.79 g/mL\times 10.4 mL=8.219 g$

Moles of t-butyl alcohol = $\frac{8.219 g}{74.12 g/mol}=0.11084 mol$

Moles of 1,4-dimethoxybenzene = $\frac{5.6 g}{138.17 g/mol}=0.04052 mol$

According to reaction 2 mol of t-butyl alcohol reacts with 1 mol of 1,4-dimethoxybenzene.

Then 0.11084 moles of t-butyl alcohol will react with :

$\frac{1}{2}\times 0.11084 mole=0.05542 mol$ of 1,4-dimethoxybenzene.

This means that moles of 1,4-dimethoxybenzene are limited and moles of t-butyl alcohol are in excess.So, the moles of product will depend upon the moles of 1,4-dimethoxybenzene.

According top reaction 1 mol of 1,4-dimethoxybenzene gives 1 mol of 1,4-di-t-butyl-2,5-dimethoxybenzene.

Then 0.04052 moles of 1,4-di-t-butyl-2,5-dimethoxybenzene will give:

$\frac{1}{1}\times 0.04052 mol= 0.04052 mol$ of 1,4-di-t-butyl-2,5-dimethoxybenzene.

Mass of 0.04052 moles of 1,4-di-t-butyl-2,5-dimethoxybenzene:

0.04052 mol × 250.37 g/mol = 10.144 g

Percentage yield:

$\frac{Experimental}{Theoretical}\times 100$

Percentage yield of 1,4-di-t-butyl-2,5-dimethoxybenzene:

Experimental yield = 4.2 g

Theoretical yield = 10.144 g

$\frac{4.2 g}{10.144 g}\times 100=41.40\%$

4 0

3 years ago

When sulfur emitted by smokestacks combines with moisture in the atmosphere to form acids that are spread by the wind, ____ resu

kari74 [83]

Answer:

The correct option is: c. acid rain

Explanation:

Acid rain refers to the precipitation that has an acidic pH. This type of precipitation is harmful as it has high hydrogen ion concentration.

The harmful emissions such as sulfur dioxide and nitrogen oxide, that are present in the Earth's atmosphere and transported by the air and wind, react with the water molecules during the precipitation to produce acidic rain.

5 0

4 years ago