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Marrrta [24]
3 years ago
5

Which element has 19 electrons surrounding the nuclei of its atoms?

Chemistry
1 answer:
QveST [7]3 years ago
5 0
I think its potassium
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What feature of a chemical equation is used to balance the equation and make sure it obeys the law of conservation of mass?
taurus [48]

Answer:

b) coefficient

Explanation:

Refer to this example:

CH4  +2  O2  →  CO2+  2  H2O

2 is used as a coefficient in this chemical equation.

5 0
3 years ago
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The lowest value of the henry's law for methane gas (ch4) will be obtained with __________ as the solvent and a temperature of _
NikAS [45]

The lowest value of the henry's law for methane gas (CH₄) will be obtained with H₂O as the solvent and a temperature of  349 K.

The lowest value of the henry's law for methane gas (CH₄) will be obtained with H₂O as the solvent and a temperature of 349 K.  

Henry's law: This law states that at a constant temperature, the amount of a gas dissolved in a given type and volume of liquid is directly proportional to the partial pressure of that gas that in equilibrium with that liquid.

Mathematically it can be written as:

          C_{g}=k\times P_{g}

So, for the methane gas , lowest value of the henry's law obtained at  349 K and with H₂O as the solvent.

3 0
3 years ago
a beaker of benzene is at room temperature. what is its vapor pressure. Is this vapor pressure large enough to cause the benzene
Serhud [2]

Answer:

(1). The vapor pressure is 91 mmHg at 20°C.

(2). No, benzene will not boil at sea level.

Explanation:

Benzene, C6H6 is an aromatic, liquid compound with with molar mass of 78.11 g/mol and Melting point of 5.5 °C. One of the importance or the uses of benzene is in the making of fibres and plastics.

The vapour pressure of benzene can be gotten from the table showing the vapor pressure of different liquids.

Boiling point can simply be defined as the point or the temperature in which the vapor pressure is the same with the atmospheric pressure.

The atmospheric pressure is 760mmHg, while the vapor pressure at sea level is at the temperature of 15°C which is equal to 71 mmHg( from the table showing the vapor pressure of different liquids).

71 mmHg is not equal to 760 mmHg, thus, at sea level Benzene will not boil.

8 0
3 years ago
Explain the difference between mechanical weathering and chemical weathering​
Alchen [17]

Answer:

mechanical weathering breaks rocks into smaller forms without any change in their composition whereas chemical weathering breaks down rocks by forming new minerals .

or simply mechanical weathering is the physical breakdown of rocks while chemical weathering is the breakdown of rocks through chemical reactions .

5 0
3 years ago
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Para que serve o balanceamento de equações químicas?
Marrrta [24]
Please speak english
3 0
3 years ago
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