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3 years ago

Why are atoms of lithium, sodium, and potassium almost neverfound alone in nature

Chemistry

2 answers:

yuradex [85]3 years ago

6 0

<span> The Alkali elements are so reactive that they are </span><span>never found alone in nature</span>

Crazy boy [7]3 years ago

4 0

These three metals- called the alkali metals- have one electron in their outer shell. Since all atoms want to be stable, it try's to lose this electron. They are very reactive, and so will be found in compounds or mixtures, such as sodium chloride (table salt!)

Hope this helps:)

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50 POINTS PLEASE HELP ASAP! I WILL MARK BRAINLIEST ONLY IF CORRECT AND CLEARLY STATED

cricket20 [7]

Answer:

1) The hydrogen-ion concentration is 0.001 M and pH of the solution is less than 7 which means that the solution is acidic.

2) The acid dissociation constant of a weak monoprotic acid is $2.0\times 10^{-8}$ .

Explanation:

1) Concentration of hydroxide ions = $[OH^-]=1\times 10^{-11}$

The pOH of the solution:

$pOH=-\log[OH^-]$

$pOH=-\log[1\times 10^{-11}=11$

pH + pOH = 14

pH = 14 - pOH = 14 - 11 = 3

The pH of the solution is given as:

$pH=-\log[H^+]$

$3=-\log[H^+]$

$[H^+]=10^{-3} M=0.001 M$

The hydrogen-ion concentration is 0.001 M and pH of the solution is less than 7 which means that the solution is acidic.

Dissociation on weak monoprotic weak acid is given by :

$HA\rightleftharpoons A^-+H^+$

Initially

0.5 M 0 0

At equilibrium

(0.5-x) x x

Given , hydrogen ions concentration = $[H^+]=x=0.0001 M$

The expression of a dissociation constant $K_a$ is given as:

$K_a=\frac{[A^-][H^+]}{[HA]}$

$=\frac{x\times x}{(0.5-x)}=\frac{0.0001\times 0.0001 }{(0.5-0.0001)}$

$K_a=2.0\times 10^{-8}$

The acid dissociation constant of a weak monoprotic acid is $2.0\times 10^{-8}$ .

6 0

3 years ago

Read 2 more answers

To make a table of elements, dmitri

yKpoI14uk [10]

The question is incomplete, the complete question is;

To make a table of the elements, dimitri Mendeleev sorted the elements according to their?

Answer:

Atomic weights

Explanation:

Dimitri Medeleeve is a Russian scientist who worked assiduously on the project of developing a system of classifying all the elements. His periodic table was filled with spaces as many atoms weren't yet discovered. 'Eka' prefix was used to name some elements whose properties closely resembled that of their predecessors in Mendeleev's system of classification.

The dependence of the atomic properties on the weight of the atom was the basis for Mendeleeves' original classification. According to Medeleeve, elements having similar chemical properties are also expected to have similar atomic weights and their atomic weights was found to increase regularly.

The Mendeleeve concept of periodic arrangement of elements is the closest precursor of the modern periodic table as it is used in chemistry. Mendeleev arranged the elements in order of increasing relative atomic mass .

6 0

3 years ago

How many molecules are there in 39 grams of water

yaroslaw [1]

Answer:

I think its 117

Explanation:

H20

2*39 (hydrogens)

78+39(oxygens)

117

6 0

3 years ago

Read 2 more answers

Elabore el balance de la ecuación por oxido reducción enumerando cada paso

Rasek [7]

Answer:

${ \rm{5CaC _{2}O _{4(aq)}+ 2KMnO _{4(aq)} + 8H _{2} SO _{4(aq)} → 5CaSO _{4(s)}+ 2Mn SO _{4(aq)}+ K _{2} SO _{4(s)} + 10CO _{2(g)} + 8H _{2} O _{l} }}$