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3 years ago

What’s the boiling point of water

Chemistry

2 answers:

love history [14]3 years ago

7 0

Answer:

100 °C

Explanation:

Well it actually It depends on temperature and altitude . The boiling point of water is 100 °C or 212 °F at 1 atmosphere of pressure (sea level). However, the value is not a consistent. The boiling point of water depends on the atmospheric pressure, which changes according to elevation.

vredina [299]3 years ago

4 0

212 Fahrenheit or 100 Celsius

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Which of the substances in the chart has the least density?

3241004551 [841]

Answer:
Option-D (Piece of Wood) is the correct answer.

Explanation:
Density is related to mass and volume as,

Density = Mass / Volume
For Wood,
Density = 42.5 / 50

Density = 0.85

You can calculate remaining densities by yourself. Among all the density of Piece of Wood is the least.

3 0

3 years ago

. Monthly measurements of atmospheric CO2 concentration at Mauna Loa began in March 1958. The average CO2 concentration for that

Harrizon [31]

Answer:

$Increase=98.8ppm$

$Average\ increase/year=1.594\frac{ppm}{year}$

Explanation:

Hello,

In this case, since the nowadays concentration of CO2 is 414.51 ppm and the concentration in 1958 was 315.71 ppm, the total increase is computed via the difference between them:

$Increase=414.51ppm-315.71ppm\\\\Increase=98.8ppm$

Moreover, the average increase per year is computed considering that from 1958 to 2020, 62 years have passed, therefore, such average is:

$Average\ increase/year=\frac{98.8ppm}{62 years} \\\\Average\ increase/year=1.594\frac{ppm}{year}$

Regards.

4 0

3 years ago

Consider the reaction Ca(OH)2(s)→CaO(s)+H2O(l) with enthalpy of reaction ΔHrxn∘=65.2kJ/mol What is the enthalpy of formation of

Ganezh [65]

Answer:

ΔH °fCaO= -655.09 KJ/mol = ΔH °fCaO

Explanation:

ΔH °(reaction)a=ΔH °f(product)-ΔH °f(reactant)

where,

ΔH °f(product)=is the standard heat of formation of products

-ΔH °f(reactant)=is the standard heat of formation of reactants

The standard heat of formation of H 2 O ( l ) is − 285.8 k J / m o l .

The standard heat of formation of Ca(OH )2 is − 986.09 k J / m o l .

For the given reaction, the standard enthalpy change is calculated by the expression shown below.

ΔH °(reaction)a=ΔH °f(CaO+H2O)-ΔH °f(Ca(OH)₂

65.2 = ΔH °fCaO+( -265.8) -(-986.09)

= ΔH °fCaO-265.8+986.09

65.2 = ΔH °fCaO+ 720.29

65.2-720.29 = ΔH °fCaO

-655.09 KJ/mol == ΔH °fCaO

3 0

3 years ago

HELP ASAP

xenn [34]

Answer:

Option A) oxygen

Explanation:

Oxygen gas it the electrolysis of an aqueous solution of sodium nitrate which a gas forms at anode it is called the oxygen gas

maybe this answer might help u out

3 0

3 years ago

Read 2 more answers

Which of the following statements are True about the experimental process used in the Diels Alder reaction?

vovikov84 [41]

Here we have to get the correct statements among the given, applicable for Diels-Alder reaction.

The true statements in case Diels-Alder reaction are-

1. An excess of Maleic anhydride is used.

2. The I.R. of the products are indistinguishable.

The Diels-Alder reaction is the most is the most important cyclo-addition reaction in organic chemistry. These are addition reactions in which ring systems are formed without eliminating any compounds.

There remains one diene and one dienophile. The reaction is reversible in nature and requires elevated temperature to obtain its transition state. The reaction rate become faster in certain condition like using of polar solvents.

Among the given statements the following statements are true-

1. An excess of maleic anhydride (the most effective di-enophile) is used to process the reaction in forward direction.

2. The products obtain in this reaction are stereoisomers thus are indistinguishable by infrared spectroscopy (IR).

The statements which are not true for the Diels-Alder reaction:

3. The re-crystallization of the products by any polar solvent like methanol is not feasible as it will cause the retro reaction due to stability of the transition state in polar solvent.

4. Cleaning of glassware are compulsory for any reaction it is not specifically true for Diels-Alder reaction.

5. The reaction occurs at elevated temperature thus flame is required.

8 0

3 years ago