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3 years ago

Which of the following is an example of heat transfer through conduction?

Chemistry

2 answers:

Bumek [7]3 years ago

8 0

Answer:

a pan on the stove getting hot

Explanation:

Conduction is type of heat transfer that involves vibration of particles transferring heat to the ones next to them by collisions. So it requires contact between substances.

Hot air rising is convection which is typical of fluids. The sun drying our clothes is radiation of waves from the sun. And microwaves as the name suggestion heats through radiation of waves. A pan on the stoves however relies on the physical contact between the stove and the pan. So particles of the stove vibrate colliding with the pan particles transferring energy

slava [35]3 years ago

7 0

A pan on the stove getting hot, because the pan is conducting the heat from the stove.

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(CO2) (O2) (He) (N2) (CH4) (Imagine these are balloons with the specified gas inside)

valentina_108 [34]

Answer:

Highest speed: He

Lowest speed: CO2

Explanation:

The rms speed (average speed) of the molecules/atoms in an ideal gas is given by:

$v=\sqrt{\frac{3RT}{M}}$

where

R is the gas constant

T is the absolute temperature of the gas

M is the molar mass of the gas, which is the mass of the gas per unit mole

From the equation, we see that at equal temperatures, the speed of the molecules in the gas is inversely proportional to the molar mass: the higher the molar mass, the lower the speed, and vice-versa.

In this problem, we have 5 gases:

(CO2) (O2) (He) (N2) (CH4)

Their molar mass is:

CO2: 44 g/mol

O2: 16 g/mol

He: 4 g/mol

N2: 14 g/mol

CH4: 16 g/mol

The gas with lowest molar mass is Helium (He): therefore, this is the gas with greatest average speed.

The gas with highest molar mass is CO2: therefore, this is the gas with lowest average speed.

8 0

4 years ago

Plz help, I will give brainliest.

baherus [9]

Answer: The value of $K_c$ is 2

Explanation:

Moles of $N_2O_4$ = 1.0 mole

Volume of solution = 1.00 L

Initial concentration of $N_2O_4$ = $\frac{1.0mol}{1.00L}=1.0M$

Equilibrium concentration of $NO_2$ = $\frac{1.0mol}{1.00L}=1.0M$

The given balanced equilibrium reaction is,

$N_2O_4(g)\rightleftharpoons 2NO_2(g)$

Initial conc. 1.0 M 0 M

At eqm. conc. (1.0-x) M (2x) M

The expression for equilibrium constant for this reaction will be,

$K_c=\frac{[NO_2]^2}{[N_2O_4]}$

Given : 2x = 1.0

x= 0.5

Now put all the given values in this expression, we get :

$K_c=\frac{(1.0)^2}{(1.0-0.5)}$

$K_c=2$

Thus the value of $K_c$ is 2

4 0

3 years ago

Why are Van der Waals forces important?

lilavasa [31]

Answer:

The answer is B.

Explanation:

They are the strongest type of inter-molecular force attractive forces that can act between atoms. This is why Vander Walls forces important.

7 0

3 years ago

While boiling potatoes for dinner in salted water, the pot boils over and you notice that the flame on your gas burner turns to

wel

Answer:

This observation can be explained under the following reasons:

High sodium content
Lowered heat temperature
Organic burn

Explanation:

High sodium content from the potato fluid causes the flame to turn yellow, as indicative of the presence of sodium (flame test).

The colour change could also be attributed to the drastic lowering of the burner heat. Finally, pure organics like wood and fats burn red, a would be the case with fluids from the boiled potatoes.

I hope this explanation was helpful.

5 0

3 years ago

Electronegativity patterns

Norma-Jean [14]

Electronegativity generally increases as you move from left to right across a period

7 0

3 years ago