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3 years ago

The quantity of heat required to change the temperature of 1 g of a substance by 1⁰c is defined as

1 answer:

Alex3 years ago

8 0

Specific heat is the quantity of heat required to change the temperature of 1 gram of a substance by 1 degree Celsius. It is the amount per unit mass that is required to raise the temperature by one degree Celsius. Every substance has its own specific heat and each has its own distinct value. The units of specific heat are joules per gram-degree Celsius (J/f C) and sometimes J/Kg K may also be used.

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A buffered solution containing dissolved aniline, C6H5NH2, and aniline hydrochloride, C6H5NH3Cl, has a pH of 5.57 . A. Determine

vlada-n [284]

Answer:

[C₆H₅NH₃⁺] = 0.0399 M

Explanation:

This excersise can be easily solved by the Henderson Hasselbach equation

C₆H₅NH₃Cl → C₆H₅NH₃⁺ + Cl⁻

pOH = pKb + log (salt/base)

As we have value of pH, we need to determine the pOH

14 - pH = pOH

pOH = 8.43 (14 - 5.57)

Now we replace data:

pOH = pKb + log ( C₆H₅NH₃⁺/ C₆H₅NH₂ )

8.43 = 9.13 + log ( C₆H₅NH₃⁺ / 0.2 )

-0.7 = log ( C₆H₅NH₃⁺ / 0.2 )

10⁻⁰'⁷ = C₆H₅NH₃⁺ / 0.2

0.19952 = C₆H₅NH₃⁺ / 0.2

C₆H₅NH₃⁺ = 0.19952 . 0.2 = 0.0399 M

5 0

3 years ago

Which of the following aqueous solutions has the lowest pH? Why?

jenyasd209 [6]

Answer:

HCI

Explanation:

The solution with the lowest pH is HCI with a pH value of 1. It is understood that it is more acidic because it is a strong acid.

6 0

3 years ago

Density of water is 1 g/ml. If a piece of wood with a density of 5 g/ml is

Alchen [17]

Answer:

The piece of wood will sink

Explanation:

If an object has a density higher than water, it will sink, and the piece of wood is more dense than water when measured.

6 0

3 years ago

Select the keyword or phrase that will best complete each sentence.

Lorico [155]

Answer:

alkenes

nucleophiles

electrophiles

syn

anti

syn and anti

Explanation:

Compounds that contain a carbon-carbon double bond are known as alkenes

Alkenes are electron rich; therefore, simple alkenes do not react with nucleophiles or bases, but will react with electrophiles or acids.

In the IUPAC system, an alkene is identified by the suffix -ene-

Addition reactions in which two parts Of a reagent are added to the same side of

a double bond are known as syn additions.

Addition reactions in which two parts of a reagent are added from opposite

sides of a double bond are called anti additions

Halogenation and halohydrin formation occur with syn and anti -additions.

Further explanations:

Compounds that contain a carbon-carbon single bond are known as alkanes. Compounds that contain a carbon-carbon double bond are known as alkenes. Compounds that contain a carbon-carbon triple bond are known as alkynes.

Nucleophiles are electron rich so they react with electron deficient centers while Electrophiles are electron deficient so they react with electron rich centers.

4 0

3 years ago

I dont get dependent and independent variables if someone can explain it and give an example that wpould be great!

Musya8 [376]

An independent variable is the variable that is changed or controlled in a experiment to test the effects on the dependent variable. A dependent variable is the variable being tested and measured. so like is math. the input variable is the independent variable. the output is the dependent variable because it depends on the input variables.

5 0

3 years ago