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ArbitrLikvidat [17]

3 years ago

15

In what areas of the periodic table do you find the least reactive elements?

2 answers:

umka21 [38]3 years ago

5 0

in the right side of the periodic table . It is group 18 called nobel gas or group This group has all element in stable form each has 8 electron in outermost orbit they are non reactive

slamgirl [31]3 years ago

4 0

Answer:

Noble gases are nonreactive, nonmetallic elements in group 18 of the periodic table. Noble gases are the least reactive of all elements. That's because they have eight valence electrons, which fill their outer energy level.

Elements: Argon

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A container of gas has a volume of 280 mL at a temperature of 22 Celsius if the pressure remains constant what is the volume 44

d1i1m1o1n [39]

Answer:

300.9mL

Explanation:

Given parameters:

V₁ = 280mL

T₁ = 22°C

T₂ = 44°C

Unknown:

V₂ = ?

Solution:

To solve this problem, we apply Charles's law;

it is mathematically expressed as;

$\frac{V_{1} }{T_{1} } = \frac{V_{2} }{T_{2} }$

We need to convert the temperature to kelvin;

T₁ = 22°C = 22 + 273 = 295K

T₂ = 44°C = 44 + 273 = 317K

Input the parameters and solve;

$\frac{280}{295}$ = $\frac{V_{2} }{317}$

V₂ x 295 = 280 x 317

V₂ = 300.9mL

5 0

3 years ago

How many molecules of BH3 are in 14.32 grams of BH3?

kkurt [141]

Answer:

6.23 x 10^23 molecules

Explanation:

First find the number of moles of BH3 from the information given. We know the amount of grams present and we can find the molar mass which is 13.84.

We know that moles is grams divided by molar mass so we get 14.32/13.84 which is 1.03 moles.

Finally, to figure out the number of molecules, we multiply 1.03 by Avogadro's number which is 6.022x10^23 and we get 6.23x10^23 molecules.

3 0

3 years ago

A gas that produces a "pop" with a burning splint is carbon dioxide. true or false

Ksivusya [100]

False, a gas that produces a pop is hydrogen
Hope this helped :)

7 0

3 years ago

Which is a thermosetting plastic?<br><br>Polythene<br>PVC<br>Melamine<br>Nylon

serg [7]

Melamine should be the right answer, i hope this helps.

5 0

3 years ago

Does anybody know how to do q4. Please show working out thanks.

insens350 [35]

Answer:

% purity of limestone = 96.53%

Explanation:

Question (4).

Weight of impure CaCO₃ = 25.9 g

Molecular weight of CaCO₃ = 40 + 12 + 3(16)

= 100 g per mole

We know at S.T.P. number of moles of CO₂ = 1 and volume = 22.4 liters

From the given reaction, 1 mole of CaCO₃ reacts with 1 mole or 22.4 liters of

CO₂.

∵ 22.4 liters of CO₂ was produced from CaCO3 = 100 g

∴ 1 liter of CO₂ will be produced by CaCO₃ = $\frac{100}{22.4}$

∴ 5.6 liters of CO₂ will be produced by CaCO₃ = $\frac{100\times 5.6}{22.4}$

= 25 g

Therefore, % purity of CaCO₃ = $\frac{\text{Weight calculated}}{{\text{Weight given}}}\times 100$

= $\frac{25}{25.9}\times 100$

= 96.53 %

7 0

3 years ago