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3 years ago

1. Does the bowling ball have more potential energy or kinetic energy as it sit on top of the building? Why?

Chemistry

2 answers:

Ksenya-84 [330]3 years ago

7 0

Answer:

I think it has more potential energy because the ball has yet to move from it's spot.

Explanation:

Luden [163]3 years ago

6 0

The bowling ball have more gravitational potential energy as it sit on top of the building

Explanation:

The energy that is possessed by an object due to the position of that object in the field of gravity is called Gravitational potential energy . The object that is present in the place that is very closer to the Earth's surface has a constant gravitational potential energy. When an object is at certain height there is a necessity of force for lifting that object form that height.

This is applies to the gravitational potential energy also.When two objects are placed at different heights, the object that is placed at the greater height will have more potential energy. This is because, the force necessary to take the object from greater height will be more.

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In which of the following case would the rusting of iron nail be the slowest ? thanks !

coldgirl [10]

Answer: D or B but i think D because iron will react slower with tap water than Hydrochloric acid

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3 years ago

Quinine (C20H24N2O2) is the most important alkaloid derived from cinchona bark. It is used as an antimalarial drug. For quinine

dolphi86 [110]

Answer:

The pH of saturated solution of the quinine is 10.05

Explanation:

Quinine (Q) is C20H24N2O2 has a molar mass of 324.4 g/mol

Q can behave as a weak base. Kb and pKb can be calculated for weak bases

pKb1 is to be considered when solving the question.

pKb1 = 5.1

Step 1 : Calculate the Kb of Quinine

pKb1 = - log [kb]

5.1 = - log [kb]

take Antilog of both side

[kb] = 7.94 x 10∧-6

Step 2: Calculate the concentration of saturated solution of Q in mol/dm3

From the question, 1900 ml of solution contains 1 g of Q

Therefore, 1000 ml of solution will contain........... x g of Q

x = 1000 /1900

x = 0.526 g in 1 dm3

In calculating concentration in mol/dm3,

Concentration in mol/dm3 = concentration in g /dm3 divided by molar mass

Molar mass of Q = 324.4

Concentration in mol/dm = 0.526 /324.4

= 0.0016 mol/dm3

Step 3: Calculating the Concentration of OH-

At Equilibrium, Kb = x² / 0.0016

7.94 x 10∧-6 = x² / 0.0016

x = √ 0.0016 × 7.94 x 10∧-6

x = 1. 127 × 10∧-4 mol/dm3

The concentration of OH- = 1. 127 × 10∧-4 mol/dm

Step 4: Calculating the pH of Quinine

Recall, pOH = - log [OH-]

pOH = - log [1. 127 × 10∧-4]

pOH = 3.948

Also recall that pH + pOH = 14

pH = 14 - 3.948

pH = 10.05

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4 years ago

Name the following ester molecule: O CH,CH,CH,CH,COCH,CH,CH, NO SCAM

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3 years ago

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rewona [7]

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3 years ago

A reaction will be spontaneous only at low temperatures if both ΔH and ΔS are negative. For a reaction in which ΔH = −310.1 kJ/m

ruslelena [56]

Answer:

3211.12 K

Explanation:

The expression for the standard change in free energy is:

$\Delta G=\Delta H-T\times \Delta S$

Where,

$\Delta G$ is the change in the Gibbs free energy.

T is the absolute temperature. (T in kelvins)

$\Delta H$ is the enthalpy change of the reaction.

$\Delta S$ is the change in entropy.

For reaction to be spontaneous, $\Delta G$

Given, $\Delta H=-310.1\ kJ/mol=-310100\ J/mol$

$\Delta S=-89.00\ J/K.mol$

So,

$\Delta H-T\times \Delta S$

Thus, applying values as:-

$-310100-T\times (-89.00)$

So, T = 3484.27 K

The conversion of T( °C) to T(K) is shown below:

T( °C) = T(K) - 273.15

So,

T = (3484.27 - 273.15) K = 3211.12 K

The temperature below which the reaction is spontaneous is:- 3211.12 K

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4 years ago