CHEMISTRY HIGH SCHOOL

Which reaction occurs most rapidly at standard conditions?H2(g) + I2(s) 2HI(g)
Cu(s) + S(s) CuS(s)
C6H12O6(s) + 6O2(g) 6CO2(g) + 6H2O(g)
5C2O42-(aq) + 2MnO4-(aq) + 16H+(aq) 10CO2(g) + 2Mn2+(aq) + 2H2O(l)
Ag+(aq) + I-(aq) AgI2(s)
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Answers

Answer 1
Answer:

Answer : Option A) H_(2)_((g)) + I_(2)_((s)) ----> 2HI_((g)).

Explanation : The reaction of hydrogen gas with iodine in solid phase will react most rapidly at standard conditions.

A rapid chemical reaction is one where reactants react fast with each other to give the products at the standard temperature and pressure conditions.

In the given choices Iodine is highly reactive as it belongs to the halogen group and also atomic hydrogen is very reactive in nature, when both combine it gives hydrogen iodide which is much stable in nature than the reactants.

when one mole of hydrogen reacts with one mole of iodine it produces 2 moles of hydrogen iodide.

H_(2)_((g)) + I_(2)_((s)) ----> 2HI_((g)).
Answer 2
Answer: The reaction occurs most rapidly at standard conditions are:
H2(g) + I2(s) 2HI(g)

The reaction that do not occur rapidly at standard conditions are 
Cu(s) + S(s) CuS(s)
C6H12O6(s) + 6O2(g) 6CO2(g) + 6H2O(g)
5C2O42-(aq) + 2MnO4-(aq) + 16H+(aq) 10CO2(g) + 2Mn2+(aq) + 2H2O(l)
Ag+(aq) + I-(aq) AgI2(s)

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Ron wants to install an energy efficient and long lasting device for lighting in his new home. Which device should he use?

Answers

Answer:

Light Emitting Diode (LED) lighting device.

Explanation:

Light Emitting Diode (LED) is an electrical component that produces light when a current flows through its terminals. It has a long life span and conserves energy coupled with brilliant lightning effects. Also, it is light in weight and generate no heat compared to other lighting devices. It is majorly recomended because of its diverse properties and efficient functions.

This componet can be incorporated to produce an energy efficient and long lasting lighting device. So, Ron should use a Light Emitting Diode (LED) lighting device.
he should use the long lasting one

The balanced chemical equation for the reaction of copper (Cu) and silver nitrate (AgNO3) is shown below. Cu + 2AgNO3 mc001-1.jpg 2Ag + Cu(NO3)2 How many moles of copper must react to form 3.50 mol of Ag?

Answers

The balanced reaction is:

Cu + 2AgNO3 = 2Ag + Cu(NO3)2

We are givent the amount of silver to be produced. This will be the starting point. Calculations are as follows:

 3.50 mol Ag ( 1 mol Cu / 2 mol Ag ) = 1.75 mol Cu

Therefore, we need 1.75 mol of copper in order to produce 3.50 mol of silver.

Answer:

1.75 moles of copper must react to form 3.50 mol of Ag.

Explanation:

Cu + 2AgNO_3\rightarrow 2Ag + Cu(NO_3)_2

According to reaction 2 moles of silver are obtained from 1 mole of copper.

Then 3.50 mole of Silver will be obtained from:

(1)/(2)* 3.5 mol=1.75 mol

1.75 moles of copper must react to form 3.50 mol of Ag.

An atom of any element must contain(1) an equal number of protons and neutrons
(2) an equal number of protons and electrons
(3) more electrons than neutrons
(4) more electrons than protons

Answers

An atom of any element must contain "(2) an equal number of protons and electrons" but it should be noted that atoms can borrow electrons from one another. 
An atom (which by definition is neutral) should have (2) an equal number of protons and electrons.
If the number of protons and electrons are not equal, it becomes an ion.The number of protons and neutrons can vary widely depending on what the substance is and depending on the isotopes.

What value was there in predicting the properties for gaps in Mendeleev's table?

Answers

Predicting the properties for gaps in Mendeleev’s table helps discover new elements. Because during his presentation of his proposed periodic table, he noted some gaps in his table and predicted that there are still unknown elements between those gaps. He uses some prefixes like dvi-, tri-, and eka- in order to give provisional names to his predicted elements. In his periodic table, he also laid out his elements from the lightest to the heaviest element. The lightest elements started from zero, some examples are gases.

Answer:

The Table helps discover new elements.

Explanation:

Consider the following generic chemical equation:A + B → C + D

Reactant A contains 85.1 J of chemical energy. Reactant B contains 87.9 J of chemical energy. Product C contains 38.7 J of chemical energy. If the reaction absorbs 104.3 J of chemical energy as it proceeds, how much chemical energy must product D contain? Explain your answer.

Answers

Answer:  238.6 J

Explanation:

According to the law of conservation of energy, energy can neither be created nor be destroyed. It can only be transformed from one form to another.

Endothermic reactions are those in which heat is absorbed by the system and thus the energy of products is higher than the energy of reactants.

For the given reaction:

A+B+energy\rightarrow C+D

Energy of A = 85.1 J

Energy of B = 87.9 J

Energy on reactant side =  Energy of A + Energy of B  + Energy absorbed 85.1 + 87.9 + 104.3 = 277.3 J

Energy on reactant side = Energy on product side = 277.3 J

Energy on product side = Energy of C + Energy of D

277.3 J = 38.7 J  + Energy of D

Energy of D = 238.6 J

Thus chemical energy product D must contain is 238.6 J

The law of conservation of energy states that energy is not created or destroyed during chemical reactions. The total amount of energy in the reactants, plus the energy absorbed during the reaction, must be equal to the total energy of the products.

Product D contains (85.1 J + 87.9 J + 104.3 J) – 38.7 J = 238.6 J of chemical energy.

in a collosion 15 kg object moving with a velocity of 3 m.s transfers all of its momentum to a 5 kg object. what would be the velocity of the 5 kg object after the collosion

Answers

P=mv
1st object- 45kg*m/s
45=5v
V=9m/s
The velocity if the second object is 9 meters per second
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