What shape are all molecules that contain only two atoms?

What substance is combination of different atoms

Furkat [3]

The substance which is a combination of different atoms is a compound.

7 0

3 years ago

A 0.25-mol sample of a weak acid with an unknown Pka was combined with 10.0-mL of 3.00 M KOH, and the resulting solution was dil

Masteriza [31]

Answer : The value of $pK_a$ of the weak acid is, 4.72

Explanation :

First we have to calculate the moles of KOH.

$\text{Moles of }KOH=\text{Concentration of }KOH\times \text{Volume of solution}$

$\text{Moles of }KOH=3.00M\times 10.0mL=30mmol=0.03mol$

Now we have to calculate the value of $pK_a$ of the weak acid.

The equilibrium chemical reaction is:

$HA+KOH\rightleftharpoons HK+H_2O$

Initial moles 0.25 0.03 0

At eqm. (0.25-0.03) 0.03 0.03

= 0.22

Using Henderson Hesselbach equation :

$pH=pK_a+\log \frac{[Salt]}{[Acid]}$

$pH=pK_a+\log \frac{[HK]}{[HA]}$

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

$3.85=pK_a+\log (\frac{0.03}{0.22})$

$pK_a=4.72$

Therefore, the value of $pK_a$ of the weak acid is, 4.72

7 0

3 years ago

You are given a sample of several compounds to separate by paper chromatography. You draw a pencil line exactly 1.00 cm from the

Pavel [41]

Answer:

a) 6.3 cm

b) 8.0 cm

c) 0.7875

Explanation:

(a) The compound has moved above upto 7.3 cm from the bottom of the paper. Let us assume that line is drawn at 1.0 cm mark as the origin of spot. \

Distance traversed by compound= 7.3 - 1.0 cm = 6.3 cm

(b) Distance traversed by the solvent = 9.0 - 1.0 cm = 8.0 cm

(c) The Rf = Compound Migration distance / Solvent front migration distance

= 6.3/8.0 = 0.7875

7 0

3 years ago

An ionic compound is a chemical compound dissociated into positive and negative ions, but globally neutral (it is a bond that us

Firdavs [7]

True

Explanation:

Ionic compounds are chemical compounds that dissociates into positive and negative ions and are globally neutral due to the charge balance. They are made up of metals and non-metals.

Ionic bonds are formed between two kinds of atoms having a large electronegativity difference.
It is usually between metals and non-metals.
The formation of this bond type involves the transfer of electrons from the less electronegative atom such that the two kinds of atoms now have completely filled outer shell like the noble gases.
This transfer makes the metal positively charged while the non-metal becomes negatively charged.
The atoms forms ions that are oppositely charged.
The charges are balanced out leaving a net neutral compound.
The electrostatic force of attraction between these ions is the ionic or electrovalent bond.

learn more:

Ionic compound brainly.com/question/6071838

#learnwithBrainly

6 0

3 years ago

An object exerts a reaction force when it _____.

VashaNatasha [74]

Touch or pushed........

7 0

3 years ago

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