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3 years ago

What causes the periodic (recurring) patterns seen in the periodic table?

Chemistry

1 answer:

IgorC [24]3 years ago

8 0

Valence elections, electron affinity, electronegativity, atomic radius

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the value of kc for the following reaction is 0.630 at 409 K N2O4(g) --> 2NO2(g) if a reaction vessel at that temperature int

stealth61 [152]

Answer: The concentration of nitrogen dioxide at equilibrium is 0.063 M

Explanation:

We are given:

Initial concentration of nitrogen dioxide = 0.0250 M

Initial concentration of dinitrogen tetraoxide = 0.0250 M

For the given chemical equation:

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

Initial: 0.025 0.025

At eqllm: 0.025-x 0.025+2x

The expression of $K_c$ for above equation follows:

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

We are given:

$K_c=0.630$

Putting values in above expression, we get:

$0.630=\frac{(0.025+2x)^2}{(0.025-x)}\\\\x=-0.2013,0.019$

Neglecting the negative value of 'x', because concentration cannot be negative

So, equilibrium concentration of nitrogen dioxide = (0.025 + 2x) = [0.025 + 2(0.019)] = 0.063 M

Hence, the concentration of nitrogen dioxide at equilibrium is 0.063 M

6 0

3 years ago

Can Someone please do this for me please please

Gnoma [55]

1. Physical
2. Chemical
3. Physical
4. Physical
5. Chemical
6. I really don't feel like doing 6, sorry.
7. False: energy to mass
11. False: change to exothermic
12. False: change to endothermic

4 0

3 years ago

While in science class a student measured a cube. She

alexira [117]

Answer:

7cm

Explanation:

6 0

4 years ago

Question 4 Unsaved When writing electron configuration the 3d block comes after the 4s block. Question 4 options: True False

zmey [24]

Answer:

True

Explanation:

According to Aufbau's principle "sublevels with lower energies are filled up before those with higher energies".

Sublevels do not fill up in numerical order but there is a certain manner in which they are filled. The pattern is shown below:

1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p e.t.c

We see that the 4s gets filled before the 3d sublevel.

6 0

4 years ago

A colligative property is when the addition of a solute to a solvent alters the boiling point or The freezing point of a solvent

Mrrafil [7]

Answer:

this cp, is probably vapor pressure.

4 0

3 years ago