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3 years ago

What temperature is absolute zero? A. OK B. 0°F O C. O molecules D. 0°C

Chemistry

2 answers:

KiRa [710]3 years ago

6 0

Answer:

o k

Explanation:

ok ok .......o k....ok aaaaaaa

Wittaler [7]3 years ago

3 0

Answer:

the absolute zero temperature is D o°c

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The mass of an electron is ___

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Answer: A
because electron mass is so small that they aren't accounted for the overall mass of an atom. Electrons are smaller than protons and neutrons.

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3 years ago

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An unused flashbulb contains magnesium and oxygen. After use, the contents are changed to magnesium oxide but the total mass doe

harkovskaia [24]

Answer: Law of conservation of mass explains these observations.

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products formed must be equal to the mass of reactants taken.

In order to get the same mass on both sides, the atoms of each element must be balanced on both sides of the chemical equation.

$2Mg+O_2\rightarrow 2MgO$

Mass of reactants= mass of Mg+ mass of $O_2$ = 48 g + 32 g = 80 g

Mass of products = mass of $MgO$ = 80 g

Thus mass of reactants is equal to mass of products, thus law of conservation of mass is obeyed.

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3 years ago

What is the other product for this reaction? Hbr + NaOH —> ( select 2)

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Answer: HBr + NaOH = nabr + h2o

Explanation:

I hope this helped!

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3 years ago

What would be an appropriate way to display the results of the experiment outlined?

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The best way (in my opinion) is to put it in a table or spreadsheet.

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Enthalpies of reaction calculated from bond energies and from enthalpies of formation are often, but not always, close to each o

jolli1 [7]

The enthalpy change in a reaction is given by-

ΔH°rxn = ∑nΔH°f,products - ∑nΔH°f,reactants

This can be expressed in terms of bond energy as-

ΔH°rxn = BEreactants - BEproducts

Therefore, the calculated bond energy according to the above equation will be-

ΔH°rxn = [ (C-C) + 2(C-O) + 4(C-H) + 2(O-H) ] - [ (C-C) + 2(C-O) + 4(C-H) + 2(O-H) = 0 kJ/mol

<h3>What is enthalpy change?</h3>

Enthalpy change is a measure of the energy emitted or consumed in a reaction. This can be determined using the following equation which involves standard enthalpy of reactant and product formation:

ΔH°rxn = ∑nΔH°f,products - ∑nΔH°f,reactants

<h3>What is bond energy?</h3>

Bond energy is defined as the amount of energy needed to dissociate a mole of molecules into their individual atoms.

Learn more about the Enthalpy Change here:

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2 years ago