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3 years ago

In which pair is the one on the left larger than the one on the right?

Chemistry

2 answers:

Nuetrik [128]3 years ago

5 0

Answer:

K is larger than K+

Explanation:

Given that the atomic radius is affected by the number of electrons arround the nucleus (being the numeber of protons constant). The lower the number of electrons, the stonger is the atraction between them and the protons resulting on a smaller atomic radius.

The K+ is a monovalent cation of K, meaning that it has 1 less electron than K and therefore a smaller radius.

GarryVolchara [31]3 years ago

3 0

K because parent atoms are always larger than their cations(positively charged atoms)

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Which of the following mixtures may be act as a buffer solution?

lions [1.4K]

Answer:

B) HF, NaF

Explanation:

A buffer solution is made up of a weak acid and its conjugate base.
In this case, HF is a weak acid and NaF is the conjugate base, therefore the mixture of HF, and NaF would make a perfect buffer solution.
The buffer would have the weak acid HF and its conjugate base, F- which comes from the soluble salt NaF.

4 0

4 years ago

What about 50 g of water?<br> I need help what this

ELEN [110]

Answer:

3.38 Tablespoons

10.14 Teaspoons

0.21 U.S. Cups

0.18 Imperial Cups

0.20 Metric Cups

50.00 Milliliters

Explanation:

3 0

3 years ago

If the percent by volume is 2.0% and the volume of solution is 250 mL, what is the volume of solute in solution? Show your work.

Mrrafil [7]

Volume of solute = 250 * 2%
= 250 * 0.02
= 5

In short, Your Answer would be 5 mL

Hope this helps!

3 0

3 years ago

Write the Noble Gas Notation for Silicone

ozzi

Answer:

[Ne] 3s2 3p2

Explanation:

Neon (Ne) is the noble gas right before silicon (Si).

Then right after neon is the 3s subshell. It has two electrons and is full.

After 3s comes the 3p subshell, and silicon only has two electrons in the 3p subshell (you can just count the electrons in each subshell on your periodic table).

8 0

3 years ago

This is the chemical formula for talc Mg3(Si2O5)2(OH)2(the main ingredient in talcum powder):

Elena-2011 [213]

Answer:

0.022 mol O

Explanation:

Mg3(Si2O5)2(OH)2

We can see that 1 mol of this substance has 3 mol of Mg.

Oxygen altogether is 5*2 (from (Si2O5)2) + 2(from(OH)2) = 10 +2 = 12

So, 1 mol of this substance has 12 mol oxygen.

So, 1 mol of this substance contains 3 mol Mg and 12 mol O, or

ratio Mg : O = 3 : 12 = 1 : 4

1 mol Mg ----- 4 mol O

0.055 mol Mg ---x mol O

x = 0.055*4/1 = 0.220 mol O

8 0

3 years ago