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3 years ago

If heat is released when water vapor what phase change Occurs

Chemistry

2 answers:

Ksenya-84 [330]3 years ago

6 0

Answer:

condensation

Explanation:

Heat is released when a vapour condenses.

Triss [41]3 years ago

3 0

Answer:

A chemical change

Explanation: It is turning into a gas so it wouldnt be a physical change

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How many orbitals are in the 5th energy level?

Alexandra [31]

Answer:7

Explanation:

8 0

3 years ago

Read 2 more answers

The density of copper is 9.0g/cm3 and the mass of a copper coin is 0.31g. Calculate the volume of the coin.

Lady_Fox [76]

Multiply 9.0g/cm3 by 0.31g = 2.79cm3

6 0

4 years ago

Complete and balance the molecular equation for the reaction of aqueous copper(II) chloride, CuCl2, and aqueous potassium phosph

aleksandrvk [35]

<u>Answer:</u> The net ionic equation is written below.

<u>Explanation:</u>

Net ionic equation of any reaction does not include any spectator ions.

Spectator ions are defined as the ions which do not get involved in the chemical equation. It is also defined as the ions which are found on both the sides of the chemical reaction when it is present in ionic form.

The chemical equation for the reaction of copper (II) chloride and potassium phosphate is given as:

$3CuCl_2(aq.)+2K_3PO_4(aq.)\rightarrow Cu_3(PO_4)_2(s)+6KCl(aq.)$

Ionic form of the above equation follows:

$3Cu^{2+}(aq.)+6Cl^-(aq.)+6K^+(aq.)+2PO_4^{3-}(aq.)\rightarrow Cu_3(PO_4)_2(s)+6K^+(aq.)+6Cl^-(aq.)$

As, potassium and chloride ions are present on both the sides of the reaction, thus, they will not be present in the net ionic equation.

The net ionic equation for the above reaction follows:

$3Cu^{2+}(aq.)+2PO_4^{3-}(aq.)\rightarrow Cu_3(PO_4)_2(s)$

Hence, the net ionic equation is given above.

7 0

3 years ago

Reaction enthalpy for ethanol oxidation, C2H5OH+3O2 -> 2CO2 + 3H2O is 1257 kJ/mole. Energy content per mol fuel ______kJ Ener

MArishka [77]

Answer:

Energy content per mol fuel 1257 kJ.

Energy content per gram fuel = 27.33 kJ

Energy released per mol carbon dioxide gas formed is 628.5 kJ

Energy released per mol oxygen gas consumed= 419 kJ

Moles of carbon dioxide gas formed per 1000 kJ energy released is 1.591.

Explanation:

$C_2H_5OH+3O_2\rightarrow 2CO_2 + 3H_2O,\Delta H= 1257 kJ/mol$

1) Energy released per mole or fuel that is ethanol :

$1mol \times 1257 kJ/mol=1257 kJ$

2) Mass of 1 mole of ethanol = 46 g

46 grams of ethanol produces 1257 kJ of energy

Energy content per gram fuel :

$\frac{1257 kJ}{46 g}=27.33 kJ/g$

3) Energy released when 2 moles of carbon dioxide are formed = 1257 kJ

Energy released per mol of carbon dioxide formed:

$\frac{1}{2}\times 1257 kJ/mol=628.5 kJ/mol$

4) Energy released when 3 moles of oxygen gas are consumed = 1257 kJ

Energy released per mol of oxygen gas consumed:

$\frac{1}{3}\times 1257 kJ/mol=419 kJ/mol$

5) Energy released when 2 moles of carbon dioxide are formed = 1257 kJ

Moles of carbon dioxide gas formed per kilo Joule of energy:

$\frac{2}{1257} mol$

Moles of carbon dioxide gas formed when 1000 kJ of heat is released:

$\frac{2}{1257} \times 1000 mol=1.591 mol$

5 0

4 years ago

What is the molecule polarity of SiCl4????

mars1129 [50]

Answer:

Silicon Tetrachloride:Explanation:

Silicon tetrachloride has the formula SiCl4. It is a covalent compound, which means that electrons are shared between the silicon atom and the chlorine atoms. The bond angles between the chlorine atoms and the silicon depend on the molecule's shape.

7 0

4 years ago