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IgorC [24]
3 years ago
15

A compound that changes color when it is placed into an acidic or a basic solution is a compound that changes color when it is p

laced into an acidic or a basic solution is protonated. amphiprotic. an acid-base indicator. a buffer.
Chemistry
1 answer:
Molodets [167]3 years ago
7 0
<span>Compounds with these characteristics are called acid-base indicators. These substances, also called pH indicators are generally weak acids or bases, the ones who dissociate incompletely when dissolved in water, releasing only some of their hydrogen atoms in the solution. An example of a</span>
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When a 0.235-g sample of benzoic acid is combusted in a bomb calorimeter, the temperature rises 1.643 ∘C . When a 0.275-g sample
andrew-mc [135]

Answer : The heat of combustion per mole of caffeine at constant volume is 76197.18 kJ/mole

Explanation :

First we have to calculate the specific heat calorimeter.

Formula used :

Q=m\times c\times \Delta T

where,

Q = heat of combustion of benzoic acid = 26.38 kJ/g = 26380 J/g

m = mass of benzoic acid = 0.235 g

c = specific heat of calorimeter = ?

\Delta T = change in temperature = 1.643^oC

Now put all the given value in the above formula, we get:

26380J/g=0.235g\times c\times 1.643^oC

c=68323.38J/^oC

Thus, the specific heat of calorimeter is 68323.38J/^oC

Now we have to calculate the heat of combustion of caffeine.

Formula used :

Q=c\times \Delta T

where,

Q = heat of combustion of caffeine = ?

c = specific heat of calorimeter = 68323.38J/^oC

\Delta T = change in temperature = 1.584^oC

Now put all the given value in the above formula, we get:

Q=68323.38J/^oC\times 1.584^oC

Q=108224.23J=108.2kJ

Now we have to calculate the moles of caffeine.

\text{Moles of caffeine}=\frac{\text{Mass of caffeine}}{\text{Molar mass of caffeine}}

Mass of caffeine = 0.275 g

Molar mass of caffeine = 194.19 g/mole

\text{Moles of caffeine}=\frac{0.275g}{194.19g/mole}=0.00142mol

Now we have to calculate the heat of combustion per mole of caffeine at constant volume.

\text{Heat of combustion per mole of caffeine}=\frac{108.2kJ}{0.00142mol}=76197.18kJ/mole

Therefore, the heat of combustion per mole of caffeine at constant volume is 76197.18 kJ/mole

4 0
3 years ago
98 POINTS!
MatroZZZ [7]
Rocks. Because the air water and soil are part of carbon.
4 0
4 years ago
Read 2 more answers
how much potassium bromide, in grams, should be added to water to prepare 0.50 of solution with molarity of 0.125M?
Flura [38]
Volume = 0.50 L

Molar mass  KBr = 119.002 g/mol

Molarity = 0.125 M

Mass ( KBr) = ?

 mass = molarity * molar mass * volume

mass = 0.125 * 119.002 * 0.50

mass = 7.437625 g of KBr

hope this helps!
5 0
3 years ago
What is the simplified value of the exponent expression 16^1/4
Sliva [168]
Answer: 2

Justitification:

1) Property: 

a^{(1/b)} =  \sqrt[b]{a}

Therefore:

16^{1/4}=  \sqrt[4]{16}

2) 16 = 2⁴

3) Property

\sqrt[n]{a^n} =a^{n/n}=a

Therefore:

\sqrt[4]{2^4} =2^{4/4}=2
3 0
3 years ago
Which pH change represents a hundredfold increase in the concentration of H3O+?
goldenfox [79]
The answer is (3) pH 3 to pH 1. The pH is related to the concentration of H3O+ with the relationship: pH = -lg c(H+). So when concentration of H3O+ increase, the pH will decrease. And decrease 2 when when increase hundredfold. Because 100=10^2.
5 0
3 years ago
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