Chem help? One question?

Chemistry

1 answer:

Savatey [412]3 years ago

5 0

I think it may be C

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When an electron in an atom moves from a higher, less stable level, down to a lower, more stable level, a photon is

Wittaler [7]

Answer:

Emitted

Explanation:

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3 years ago

Which best represents a balanced equation?

bazaltina [42]

Explanation:

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mark me as brainlist ok

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3 years ago

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Using the equations and enthalpy values provided, which mathematical expression can be used to determine the unknown enthalpy ch

vlabodo [156]

In order to solve this, we need to make use of Hess' Law.

We are already given the equations and their corresponding deltaH. Using Hess' Law, we can generate this equation:
104 kJ = x - (-1182 kJ) - (-1144 kJ)

Among the choices, the answer is
B.104 = x - [(-1182) + (-1144)]

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Stolb23 [73]

Answer:

I liked the video, it gave us lots of information about___. __ means/ is about.

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A scientist measures the standard enthalpy change for the following reaction to be -17.2 kJ : Ca(OH)2(aq) 2 HCl(aq)CaCl2(s)

elixir [45]

Answer: $\Delta H^{0}=-173.72$ kJ/mol

Explanation: Enthalpy Change is the amount of energy in a reaction - absorption or release - at a constant pressure. So, Standard Enthalpy of Formation is how much energy is necessary to form a substance.

The standard enthalpy of formation of HCl is calculated as:

$\Delta ^{0}=\Sigma H_{products}-\Sigma H_{reactants}$