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2 years ago

How can the gravitational potential energy of an object be changed?

Chemistry

1 answer:

Aleksandr [31]2 years ago

7 0

Answer:

Gravitational potential energy may be converted to other forms of energy, such as kinetic energy. If we release the mass, gravitational force will do an amount of work equal to mgh on it, thereby increasing its kinetic energy by that same amount (by the work-energy theorem).

Explanation:

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30cm^3 of a dilute solution of Ca(OH)2 required 11 cm^3 of 0.06 mol/dm^. Hcl for complete neutralization. Calculate the concentr

Alenkasestr [34]

Answer: Thus concentration of $Ca(OH)_2$ in $mol/dm^3$ is 0.011 and in $g/dm^3$ is 0.814

Explanation:

To calculate the concentration of $Ca(OH)_2$ , we use the equation given by neutralization reaction:

$n_1M_1V_1=n_2M_2V_2$

where,

$n_1,M_1\text{ and }V_1$ are the n-factor, molarity and volume of acid which is $HCl$

$n_2,M_2\text{ and }V_2$ are the n-factor, molarity and volume of base which is $Ca(OH)_2$

We are given:

$n_1=1\\M_1=0.06mol/dm^3\\V_1=11cm^3=0.011dm^3\\n_2=2\\M_2=?\\V_2=30cm^3=0.030dm^3$ $1cm^3=0.001dm^3$

Putting values in above equation, we get:

$1\times 0.06mol/dm^3\times 0.011dm^3=2\times M_2\times 0.030dm^3\\\\M_2=0.011mol/dm^3$

The concentration in $g/dm^3$ is $0.011mol/dm^3\times 74g/mol=0.814g/dm^3$

Thus concentration of $Ca(OH)_2$ is $0.011mol/dm^3$ and $0.814g/dm^3$

4 0

3 years ago

92dm3 of a gas dissolved in a solvent. How many moles is this?

Paul [167]

Assuming its at r. t.p and pressure
no. of moles = 96/24=4moles
altho some books will say that its 23.7dm3/mole but that doesnt really matter because its the process that matters

5 0

3 years ago

Besides glycerol what 3 other molecules make up a triglyceride?

ICE Princess25 [194]

Triglyceride is a molecule constituted by one one molecule of glycerol and 3 molecules of fatty acids. The structure of a glycerol is like a letter "E", where the vertical line ( | ) is the glycerol and the three horizontal lines are long chains of organic acids, each with one COOH group, called fatty acids.<span> The answer is that the other 3 molecules that make up a triglyceride are fatty acids.</span>

6 0

3 years ago

For the titration of a weak acid with a strong base what is the pKa of the weak acid if the pH is 6.72 at the equilvalence point

Paladinen [302]

Explanation:

We have to calculate $pK_{a}$ value.

It is known that at the equivalence point concentration of acid is equal to the concentration of anion formed.

Hence, [HA] = $[A^{-}]$

Now, relation between $pK_{a}$ and pH is as follows.

pH = $pK_{a} + log \frac{[A^{-}]}{[HA]}$

Putting the values into the above formula as follows.

pH = $pK_{a} + log \frac{[A^{-}]}{[HA]}$

4.23 = $pK_{a} + log (1)$ (as [HA] = $[A^{-}]$ )

$pK_{a}$ = 4.23 (as log (1) = 0)

or, $pK_{a}$ = 4

Thus, we can conclude that $pK_{a}$ of given weak acid is 4.

6 0

3 years ago

Explain what occurs in a substitution reaction and give an example of substitution reaction. Explain why organic reactions are t

uranmaximum [27]

Substitution Reactions are those reactions in which one nucleophile replaces another nucleophile present on a substrate. These reactions can take place via two different mechanism i.e SN¹ or SN². In SN¹ substitution reactions the leaving group leaves first forming a carbocation and nucleophile attacks carbocation in the second step. While in SN² reactions the addition of Nucleophile and leaving of leaving group take place simultaneously.

Example:
OH⁻ + CH₃-Br → CH₃-OH + Br⁻

In above reaction,

OH⁻ = Incoming Nucleophile

CH₃-Br = Substrate

CH₃-OH = Product

Br⁻ = Leaving group

Organic reactions are typically slower than ionic reactions because in organic compounds the covalent bonds are first broken, this breaking of bonds is a slower step, while, in ionic compounds no bond breakage is required as it consists of ions, so only bond formation takes place which is a quicker and fast step.

7 0

3 years ago