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motikmotik
4 years ago
8

If the enthalpy value for a reaction is negative, what does that indicate about the reaction? Please explain how you got your an

swer
A) It’s endothermic and heat is absorbed by the system.
B) It’s exothermic and heat is absorbed by the system.
C) It’s endothermic and heat is released to the surroundings.
D) It’s exothermic and heat is released to the surroundings.
Chemistry
2 answers:
sukhopar [10]4 years ago
7 0

Answer: Option (D) is the correct answer.

Explanation:

When reactants absorb energy in a chemical reaction then products have more energy than the reactants. The value of \Delta H is positive for an endothermic reaction.

Whereas when reactants release energy in a chemical reaction then products have less energy than the reactants. The value of \Delta H is negative for an exothermic reaction.

Thus, we can conclude that if the enthalpy value for a reaction is negative, then it indicates that the reaction is exothermic and heat is released to the surroundings.

Elis [28]4 years ago
4 0

The answer is; D

Enthalpy is the system’s internal energy ( considering the product of its pressure and volume). When the enthalpy is negative, it means that the products have a lower energy level than the reactants - meaning the system has dispensed some energy into the environment.

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Phosphorus has a higher ionization energy than silicon because: 1. the outer orbitals of phosphorus are located closer to the nu
Contact [7]

Answer: Option (1) is the correct answer.

Explanation:

Ionization energy is defined as the energy required to remove the most loosely bound electron from a neutral gaseous atom.

With increase in atomic size of the atom, there will be less force of attraction between the nucleus and the valence electrons of the atom. Hence, with lesser amount of energy the valence electrons can be removed.

When we move across a period then due to increase in force of attraction the size of atom decreases.

Thus, we can conclude that Phosphorus has a higher ionization energy than silicon because the outer orbitals of phosphorus are located closer to the nucleus than the outer orbitals of silicon.

7 0
3 years ago
Please help check over my work, sorry for spamming
steposvetlana [31]

Answer:

reflection you're right

Explanation:

7 0
3 years ago
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What is the mass of a metal block with a volume of 3.1cm3 and a density of 3.82 g/cm3
zepelin [54]

Answer:

11.842g

Explanation:

To find mass the formula is volume times density.

4 0
4 years ago
draw the lewis structure, including unshared pairs, of the following molecule. carbon has four bonds in the compound. propane (c
SIZIF [17.4K]

There are three carbon and 8 hydrogen present in propane molecule. The Lewis structure of propane is shown as:

Three molecules of such carbon atoms bound to eight molecules with hydrogen atoms make up the organic complex propane molecule.

It is known that carbon has 4 valence electrons and hydrogen has one valence electron. Carbon needs 4 extra electrons to complete its octet hence, it will share its electrons with with 4 hydrogen atom and complete its octet.

Carbon will be formed 4 bond . Three bond with hydrogen and one bond with carbon atom.

To know more about Lewis structure.

brainly.com/question/15837141

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6 0
2 years ago
How many moles of copper are present in a sample of tennantite with a mass of 2290 grams?
grin007 [14]

Answer:

               18.58 moles of Cu

Solution:

Data Given:

                  Chemical Formula of Tennantite  =  Cu₁₂As₄S₁₃

                  Mass of Cu₁₂As₄S₁₃  =  2290 g

                  M.Mass of Cu₁₂As₄S₁₃  =  1479.06 g.mol⁻¹

Step 1: Calculate Moles of Cu₁₂As₄S₁₃ as,

                               Moles  =  Mass ÷ M.Mass

Putting values,

                               Moles  =  2290 g ÷ 1479.06 g.mol⁻¹

                                Moles  =  1.548 mol

Step 2: Calculate Moles of Cu,

As,

                         1 mole of Cu₁₂As₄S₁₃ contains  =  12 moles of Cu

So,

               1.548 mol of Cu₁₂As₄S₁₃ will contain  =  X moles of Cu

Solving for X,

                     X  =  (1.548 mol × 12 mol) ÷ 1 mol

                     X  =  18.58 moles of Cu

5 0
4 years ago
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