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4 years ago

Which of the following statements is true about calorimetry?

Chemistry

2 answers:

balu736 [363]4 years ago

4 0

Answer:

Option C

Explanation:

The heat released by the system is absorbed by the surroundings, then only the heat will be balanced.

The surrounding heat increases and so to balance that heat the system releases heat so that it can cool down because heat is neither created nor destroyed.

This is the first law of thermodynamics.

Burka [1]4 years ago

4 0

Answer : The correct statement is, Heat released by the system is equal to heat absorbed by the surroundings.

Explanation :

According to the first law of thermodynamic, the energy can not be created or destroyed, it can only change or transfer from one state to another state.

Calorimetry : It is a device that is used to measure the amount of heat transferred to or from a system or surrounding.

In order to maintain the equilibrium, when some amount of heat released by the system then this released heat is absorbed by the surroundings.

Hence, correct statement is, Heat released by the system is equal to heat absorbed by the surroundings.

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From the Henderson-Hasselbalch equation, explain how the ratio [Al/[HA] changes with changing pH

Kryger [21]

Answer:

The ratio [A-]/[HA] increase when the pH increase and the ratio decrease when the pH decrease.

Explanation:

Every weak acid or base is at equilibrium with its conjugate base or acid respectively when it is dissolved in water.

$HA + H_{2}O$ ⇄ $A^{-} + H_{3}O^{+}$

This equilibrium depends on the molecule and it acidic constant (Ka). The Henderson-Hasselbalch equation,

$pH = pKa + Log \frac{[A^{-}]}{[HA]}$

shows the dependency between the pH of the solution, the pKa and the concentration of the species. If the pH decreases the concentration of protons will increase and the ratio between A- and AH will decrease. Instead, if the pH increases the concentration of protons will decreases and the ratio between A- and AH will increase.

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3 years ago

What is the KE of 750 kg car moving at 25 m/s?

Ymorist [56]

Answer: 234,375 J=234.375 kJ

Explanation:

K= m*V²/2

K=750kg*625m²/s²/2=234375 J

8 0

3 years ago

Explain why you can boil water in a pot without the pot also boiling

ddd [48]

Because the pot isn’t water it just gets really hot and you can burn yourself if you touch it

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3 years ago

With the atomic number 1 and an atomic mass of 1.0079, hydrogen has _________.

GarryVolchara [31]

The answer is A for number 1 and D for 2

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2 years ago

Read 2 more answers

The effectiveness of nitrogen fertilizers depends on both their ability to deliver nitrogen to plants and the amount of nitrogen

densk [106]

Answer:

Ammonia > Urea > Ammonium nitrate > Ammonium sulphate

Explanation:

Percentage by mass of nitrogen in NH3:

Molar mass of NH3= 17 g/mol

Hence % by mass = 14/17 × 100 = 82.35%

% by mass of NH4NO3

Molar mass of NH4NO3 = 80.043 g/mol

Hence; 28/80.043 × 100 = 34.98%

% by mass of (NH4)2SO4;

Molar mass of (NH4)2SO4= 132.14 g/mol

Hence; 28/132.14 × 100 = 21.19%

% by mass of CH4N2O

Molar mass of urea = 60.0553 g/mol

Hence 28/60.0553 × 100 = 46.62%

8 0

3 years ago