All categories

3 years ago

Which correctly describes the reaction between potassium and excess water?

1 answer:

7 0

Balanced chemical reaction: 2K(s) + 2H₂O(l) → 2KOH(aq) + H₂(g).

KOH is inorganic compound p<span>otassium hydroxide, a strong base.
H</span>₂ is hydrogen gas.
In balanced chemical reaction number of atoms on both side of chemical reaction must be same. There are two potassium atoms, four hydrogen atoms and two oxygen atoms on both side of reaction.

You might be interested in

The following molecular scenes depict an important reaction in nitrogen chemistry (nitrogen is blue; oxygen is red): Write a bal

alexandr1967 [171]

Answer:

2 N2O5 4 NO2 + 1 O2

Explanation:

For the last one you dont really have to add the 1 but you can if its nedded,

since 3 divided by 3 is 1.

3 0

2 years ago

For the gaseous reaction of carbon monoxide and chlorine to form phosgene (COCL2)

Natasha_Volkova [10]

This is an incomplete question, here is a complete question.

For the gaseous reaction of carbon monoxide and chlorine to form phosgene (COCl₂)

Perform the following calculations:

A) Calculate ΔS at 298 K (ΔH= -220 kJ/mol and ΔG= -206 kJ/mol

B) Assuming that ΔS and ΔH change little with temperature, calculate ΔG at 450 K.

Answer :

(a) The value of ΔS at 298 K is, -0.0469 kJ/mol.K

(b) The value of ΔG at 450 K is, -199 kJ/mol

Explanation :

(a) According to Gibb's equation:

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

$\Delta G$ = Gibbs free energy = -206 kJ/mol

$\Delta H$ = enthalpy change = -220 kJ/mol

$\Delta S$ = entropy change = ?

T = temperature in Kelvin = 298 K

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

$-206kJ/mol=-220kJ/mol-298K\times \Delta S$

$\Delta S=-0.0469kJ/mol.K$

Thus, the value of ΔS at 298 K is, -0.0469 kJ/mol.K

(b) According to Gibb's equation:

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

$\Delta G$ = Gibbs free energy = ?

$\Delta H$ = enthalpy change = -220 kJ/mol

$\Delta S$ = entropy change = -0.0469 kJ/mol.K

T = temperature in Kelvin = 450 K

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

$\Delta G=-220kJ/mol-450K\times -0.0469 kJ/mol.K$

$\Delta G=-198.895kJ/mol\approx -199kJ/mol$

Thus, the value of ΔG at 450 K is, -199 kJ/mol

6 0

3 years ago

PLEASE HELP!! 50 POINTS FOR ONE MULTIPLE CHOICE QUESTION!!!!!!!!!!!!!!!

Paul [167]

Answer:

it is B

Explanation:

8 0

2 years ago

Read 2 more answers

If electrons were used in the two slit experiment instead of light, what change would need to be made to the slit spacing in ord

irina [24]

The change that would need to be made to the slit spacing in order to see a diffraction pattern is bending, because in understanding why light behaves like a wave, it is the interference and diffraction were the phenomena distinguish waves from particles but waves are the only one can interfere and diffract while particles do not. The light bends around obstacles or cylinder like waves do, then it is bending which cause and resulted in the single slit diffraction pattern.

5 0

3 years ago

When the temperature of a 3. 0-l sample of a gas is dropped from 200°c to 100°c, what will be the final volume of the gas sample

ipn [44]

P1V1T1=P2V2T2 Add 273 to convert degrees Celsius to Kelvin:

∴200×25/298=250×V2/273, ∴V2=200×25×273/298×250, ∴V2=18.32L

<h3>Where is the volume equation?</h3>

The basic formula for volume is length, breadth, and height, as opposed to length, width, and height for the area of a rectangular shape. The calculation is unaffected by how you refer to the various dimensions; for instance, you can use "depth" instead of "height."

<h3>What is chemistry using volume units?</h3>

Volume, which is measured in cubic units, is the 3-dimensional space occupied by matter or encircled by a surface. The cubic meter (m3), a derived unit, is the SI unit of volume.

to know more about volume and temperature here:

brainly.com/question/12050285

#SPJ4

4 0

1 year ago