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olasank [31]
3 years ago
10

Give criteria in terms of temperature changes for exothermic and endothermic reactions

Chemistry
1 answer:
alexandr402 [8]3 years ago
4 0

Answer:

The correct answer based on the criterion of whether the temperature increases or decreases.

Explanation:

If the ambient temperature increases when a reaction takes place, we can deduce that it is an exothermic reaction, since in this type of reaction the system gives heat to the environment, increasing the temperature.

On the other hand, if the ambient temperature decreases, we can deduce that we are in front of an endothermic reaction, since in this type of reaction the system absorbs heat from the environment so the temperature decreases.

Have a nice day!

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What is the molarity of a strong acid solution with a pH of 3?
Anna35 [415]

Answer:

Since HCl is a strong acid, it completely ionizes, and the pH of HCl in solution can be found from the concentration (molarity) of the H+ ions, by definition equal to 0.100 M. (The conjugate base of the acid, which is the chloride ion Cl–, would also have a concentration of 0.100 M.) The pH is thus –log(0.100) = 1.000.

Explanation:

6 0
3 years ago
Plz can anyone help me I'm a bit stuck in this one ​
trasher [3.6K]

Answer:

just see if i am not wrong

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8 0
3 years ago
URGENT.
Sergio [31]

Answer:

1. 72.9 atm

2. 0.43937 K

Explanation:

1. Gray- lussacs law is p1/t1=p2/t2 so we use this formula to figure it out by filling in the variables and solving

p1=45.0 atm

t1=323 K

p2= ?

t2=523 K

Now we fill in this in the formula and solve - 45.0 atm/ 323 K = p2/ 523 K

and now we solve for p2 by multiplying 535k by each side to give us p2

2. Using the same formula we get 10.0atm/? = 12.0 atm/ 273.15 k and we divide both sides by 10.0 atm

4 0
3 years ago
In the following reaction, how many moles of H2O are created when 7 moles of oxygen are consumed?
notka56 [123]

Answer:

C

Explanation:

You can see in the chemical equation that 7 O_{2} are used up to produce 6H_{2}O

4 0
3 years ago
Calculate mole fraction of benzene (70 g) having 30 gram of mass of carbon tetrahedral​
Fynjy0 [20]

Moles of benzene

  • 70/90=7/9=0.8mol

moles of CCl_4

  • 30/154
  • 0.2mol

Now

\\ \rm\Rrightarrow \chi_{C_6H_6}

\\ \rm\Rrightarrow \dfrac{\chi_{C_6H_6}}{\chi_{sol^n}}

\\ \rm\Rrightarrow \dfrac{0.8}{0.8+0.2}

\\ \rm\Rrightarrow \dfrac{0.8}{1}

\\ \rm\Rrightarrow 0.8

4 0
2 years ago
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