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strojnjashka [21]
3 years ago
14

Which of the following statements describes

Chemistry
1 answer:
kozerog [31]3 years ago
5 0

Answer:

Energy is released as heat during the reaction.

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Air is a mixture of gases that is about 78.0% N2 by volume. When air is at standard pressure and 25.0 ∘C, the N2 component will
Gemiola [76]

Answer:

The value of Henry's law constant for N2 = 6.26 * 10^-4  M/ atm

Explanation:

Step 1: Data given

Temperature = 25.0 °C

The N2 component will dissolve in water with a solubility of 4.88*10^−4 M

air is at standard pressure = 1.00 atm

Step 2: Calculate Henry's law constant for N2

C=k*Pgas

⇒ with  C = the solubility of a gas at a fixed temperature in a particular solvent

⇒  with k = Henry's law constant

 ⇒  with Pgas = the partial pressure of the gas

k = C/Pgas

Since 78.0 % of the gas is N2

P(N2) = 0.78 atm

k = C/P(N2) = (4.88*10^−4 M)/(0.78 atm)

k = 6.26 * 10^-4  M/ atm

The value of Henry's law constant for N2 = 6.26 * 10^-4  M/ atm

7 0
4 years ago
A temprature change in a reaction indicates
umka21 [38]

Chemical change

Explanation:

Often times, in chemical reactions, a temperature change indicates that a chemical change has occurred.

What is a chemical change?

  • It is a kind of change in which new products are formed.
  • Chemical changes are usually accompanied by energy changes in reactions.
  • The process is not easily reversible.
  • It usually involve a change in mass.
  • Requires considerable amount of energy

When temperature change occurs, it usually denotes chemical change.

learn more:

Chemical change brainly.com/question/9388643

#learnwithBrainly

3 0
3 years ago
Below is the Lewis structure of the hydrogen cyanide molecule.
lianna [129]

Answer :

The number of bonding pairs of electrons around the hydrogen atom = 2

The number of lone pairs of electrons around the hydrogen atom = 0

Explanation :

Lewis-dot structure : It shows the bonding between the atoms of a molecule and it also shows the unpaired electrons present in the molecule.

In the Lewis-dot structure the valance electrons are shown by 'dot'.

The given molecule is, HCN

As we know that carbon has '4' valence electrons, hydrogen has '1' valence electrons and nitrogen has '5' valence electrons.

Therefore, the total number of valence electrons in HCN = 1 + 4 + 5 = 10

According to Lewis-dot structure we conclude that, there are 8 number of bonding electrons and 2 number of non-bonding electrons.

The number of bonding pairs of electrons around the hydrogen atom = 2

The number of lone pairs of electrons around the hydrogen atom = 0

8 0
3 years ago
GUYS QUICK HELP!<br> is a soda pop bottle a invention or an innovation?
Grace [21]

Answer:

Invention

Explanation:

!Hope This Helps!

8 0
3 years ago
Read 2 more answers
Hydrogen is manufactured on an industrial scale by this sequence of reactions:
hichkok12 [17]

Answer:

K=K_1*K_2\\\\K=\frac{[H_2]^3[CO_2][H_2]}{[CH_4][H_2O][H_2O]}

Explanation:

Hello there!

In this case, for the given chemical reaction, it turns out firstly necessary to write the equilibrium expression for both reactions 1 and 2:

K_1=\frac{[CO][H_2]^3}{[CH_4][H_2O]} \\\\K_2=\frac{[CO_2][H_2]}{[CO][H_2O]}

Now, when we combine them to get the overall expression, we infer these two are multiplied to get:

K=K_1*K_2\\\\K=\frac{[CO][H_2]^3}{[CH_4][H_2O]} *\frac{[CO_2][H_2]}{[CO][H_2O]}\\\\K=\frac{[H_2]^3[CO_2][H_2]}{[CH_4][H_2O][H_2O]}

Regards!

6 0
3 years ago
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