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2 years ago

How many bonded pairs of electrons are there in the molecule NOCl? A)2 B)3 C)4 D)5

Chemistry

1 answer:

iren2701 [21]2 years ago

3 0

There are 2 covalent bonds between the Nitrogen and Oxygen, and 1 between the Nitrogen and Chlorine.

It should be 3.

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What is the molar mass of CO2

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Molar mass of CO2 = 44.01 g/mol

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3 years ago

Conservation of mass was discussed in the background. describe how conservation of mass (actual, not theoretical) could be check

rosijanka [135]

Conservation of mass can be checked in an experiment . There are three steps to do it in a best way:

1. Weigh all the equipment and materials required in the experiment before the experiment.

2. Avoid spillage and evaporation during the experiment.

3. Weigh all the equipment and materials after the experiment.

If the mass is conserved then weight from step 1 is equal to weight from step 3.

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3 years ago

1. Which of the following is a correctly written thermochemical equation?

WITCHER [35]

Explanation:

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The given correct thermochemical reactions are:

$Fe(s)+O_2(g)\rightarrow Fe_2O_3(s),\Delta H = 3,926 kJ
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$C_3H_8(g)+5O_2 (g)\rightarrow 3CO_2 (g)+4H_2O(l),\Delta H= 2,220 kJ/mol$

2. Phase change affect the value of the enthalpy change of the thermochemical equation. This is because change in phase is accompanied by change in energy. For example:

$H_2O(s)\rightarrow H_2O(g),\Delta H_{s}=51.1 kJ/mol$

$H_2O(l)\rightarrow H_2O(g),\Delta H_{v}=40.65 kJ/mol$

In both reaction phase of water is changing with change in energy of enthalpy of reaction.

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3 years ago

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Which one of the following solutions would have a pH value greater than 7?

Sliva [168]

Answer:

The 2 one

Explanation:

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2 years ago

Which happens when a reversible reaction reaches a state of chemical equilibrium?

Trava [24]

Explanation:

Reversible reactions that happen in a closed system eventually reach equilibrium. At equilibrium, the concentrations of reactants and products do not change. But the forward and reverse reactions have not stopped - they are still going on, and at the same rate as each other.

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2 years ago

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