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4 years ago

What characteristic of an element shown on the periodic table can help you to predict its melting point

1 answer:

7 0

<h2> The characteristic of the element that shown on the periodic table can help you to predict its melting point is</h2><h2 />

metals which are found in group 1 , 2 and group 13 have generally posses low melting
non metals in group which are found in group 14 to group 18 low melting point in general

<u><em> Explanation</em></u>

<em>melting point are varied and do not generally form a distinguishable trend across the periodic table but the above conclusion can be drawn from the periodic table</em>

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n the following reaction, how many liters of oxygen will react with 270 liters of ethene (C2H4) at STP? C2H4(g) + 3O2(g) 2CO2(g)

natima [27]

C₂H₄ + 3O₂ = 2CO₂ + 2H₂O

V(C₂H₄) = 270 L

V(O₂)=3V(C₂H₄)

V(O₂)=3*270=810 L

8 0

3 years ago

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A tank contains a mixture of helium, neon, and argon gases. If the total pressure in the tank is 490. mmHg and the partial press

OleMash [197]

Answer: The partial pressure of neon is 173 mmHg

Explanation:

According to Dalton's law, the total pressure is the sum of individual pressures.

$p_{total}=p_A+p_B+p_C$

Given : $p_{total}$ =total pressure of gases = 490 mm Hg

$p_{He}$ = partial pressure of Helium = 215 mmHg

$p_{Ar}$ = partial pressure of argon = 102 mm Hg

$p_{Ne}$ = partial pressure of neon= ?

$p_{total}=p_{He}+p_{Ar}+p_{Ne}$

$490=215+102+p_{Ne}$

$p_{Ne}=173mmHg$

Thus partial pressure of neon is 173 mmHg

5 0

3 years ago

If an element is a reactant or product in a chemical reaction, the reaction must be an oxidaton-reduction reaction. Why is this

Bezzdna [24]

Explanation:

Oxidation reduction reactions are the reactions in which one specie oxidizes and other reduces.

For example,

$2Na+2HCl\rightarrow H_2+2NaCl$

This is a oxidation reduction reaction because sodium in elemental state ( 0 oxidation state) oxidizes to Na⁺ in NaCl. Also H⁺ in HCl reduces to H° in H₂.

Elements are present in 0 oxidation state and either it is formed or consumed, its oxidation state has to be changed for a chemical reaction to occur. Hence, it is true.

8 0

4 years ago

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Answer:

Explanation:

4 0

3 years ago

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Rhenium has two naturally occurring isotopes, Re-185 and Re-187. The relative atomic mass of rhenium is 186.2. What are the natu

Ahat [919]

Answer:

The natural abundance of Re-185 is 40% and of Re-187 is 60%

Explanation:

Relative atomic mass is defined as the sum of the mass of each isotope times its relative abundances.

Is Rhenium has only 2 isotopes and the abundances are X and Y we can write:

X + Y = 1 <em>(1)</em>

And:

185X + 187Y = 186.2 <em>(2)</em>

<em>Where X is abundance of Re-185 and Y abundance of Re-187</em>

<em />

Replacing (1) in (2):

185X + 187(1-X) = 186.2

185X + 187-187X = 186.2

-2X = -0.8

X = 0.4 = 40%

And Y = 100% - 40% = 60%

<h3>The natural abundance of Re-185 is 40% and of Re-187 is 60%</h3>

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3 years ago