CHEMISTRY MIDDLE SCHOOL

Consider the following intermediate chemical equations.What is the enthalpy of the overall chemical reaction

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Consider the following intermediate chemical equations. What is the enthalpy - 1

Answers

Answer 1
Answer:

Answer: 250 kJ

Explanation: According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to Hess’s law, the chemical equation can be treated as algebraic expressions and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

P_4(s)+6Cl_2\rightarrow 4PCl_3  \Delta H_1=-2439kJ (1)

4PCl_5(g)\rightarrow P_4(s)+10Cl_2(g)  \Delta H_2=3438kJ (2)

Net chemical equation:

PCl_5(g)\rightarrow PCl_3(g)+Cl_2(g)  \Delta H=? (3)

Adding 1 and 2 we get,

4PCl_5(g)\rightarrow 4PCl_3(g)+4Cl_2\Delta H_3=\Delta H_1+\Delta H_2=-2439+3438=1000kJ   (4)

Now dividing equation (4) by 4, we get

PCl_5(g)\rightarrow PCl_3(g)+Cl_2

\Delta H=(\Delta H_3)/(4)=(1000kJ)/(4)=250kJ   (4)

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2 bromocyclopentanamine line formula

Answers

Answer:

The structure for 2 brormocyclopentan amine is given in attached file.

Explanation:

2-bromocyclopentamine (Figure attached) is a synthetic compound which is synthesized by substitution reaction of cyclopentamine and hydrobromide. Its molecular formula and molecular mass are C5H10NBr and 164.05 g/mol respectively.  It is a very reactive compound so it doesn’t available in pure form, it is present in market as a mixture of 2-bromocyclopentamine and Hydrobromide.

Properties:

Its boiling point is 115 °C.

Its melting point is  -75 °C.

It is highly flammable.

It is highly toxic.

It is irritant.

It is corrosive in nature.

What is the role if DNA in determining an organism's traits

Answers

Everything. DNA contains genes and which genes a person has determines which (if any) proteins are formed. Based on how much of a protein is formed determines how strong a trait is expressed. DNA is the genetic material that contains genes. genes contain information about an organisms trait. hope this helps :)

What is the chemical reaction of Water breaks down into hydrogen and oxygen.

Answers

Answer:

electrolysis

Explanation:

i hope that helps you!
Electrolysis, because when an electric current is passed through liquid water it changes the water into two gases

What dose it mean to say that mass is conserved during a physical change?

Answers

 It means that the amount of mass will stay the same after the change occurs.

Why does hot water freeze faster than cold water?

Answers

Answer:

Temperature dependency is responsible for the process that hot water freeze faster than cold water.

Explanation:

The effect given above is called Mpemba Effect. According to this idea hot water freezes more quickly as compared to cold water. But until now there is no convincing explanation for this strange phenomenon.  One idea is that hot containers make better thermal contact with a refrigerator and so conduct heat more efficiently because a good conductor is good fro the transfer of heat. Another idea about this effect is that warm water evaporates more quickly and since this is an endothermic process, it cools the water making it freeze more quickly.

warm water evaporates rapidly and since this is an endothermic process, it cools the water making it freeze more quickly.

Physical and chemical properties

what is density when mass is 5.2 and volume is 0.117

Answers

Density = mass / volume

D = 5.2 / 0.117

D = 44.44
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