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kykrilka [37]
3 years ago
6

With respect to energy, which is not necessarily a goal of chemistry ?

Chemistry
1 answer:
vodomira [7]3 years ago
6 0

With respect to energy finding ways to conserve energy is not the goal of chemistry.

Answer: Option B

<u>Explanation:</u>

Chemistry is important to study about matter and energy. All the changes occurring in the environment around us is due to the chemical changes. Chemistry provides the base for understanding biology, physics, astronomy and even the basic for cooking.

Chemistry teaches us how energy is produced, how energy is stored and how energy is used in various fields. The law of conservation of energy is dealt by physics. Chemistry is into clothing, cleaning and in every activity.

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Balance the following redox reaction in acidic solution. Zn(s)+MnO−4(aq)→ Zn+2(aq)+Mn+2(aq)
devlian [24]

Answer:

2MnO₄⁻ + 5Zn + 16H⁺ → 2Mn²⁺ + 8H₂O + 5Zn²⁺

Explanation:

To balance a redox reaction in an acidic medium, we simply follow some rules:

  1. Split the reaction into an oxidation and reduction half.
  2. By inspecting, balance the half equations with respect to the charges and atoms.
  3. In acidic medium, one atom of H₂O is used to balance up each oxygen atom and one H⁺ balances up each hydrogen atom on the deficient side of the equation.
  4. Use electrons to balance the charges. Add the appropriate numbers of electrons the side with more charge and obtain a uniform charge on both sides.
  5. Multiply both equations with appropriate factors to balance the electrons in the two half equations.
  6. Add up the balanced half equations and cancel out any specie that occur on both sides.
  7. Check to see if the charge and atoms are balanced.

Solution

                            Zn + MnO₄⁻ → Zn²⁺ + Mn²⁺

The half equations:

                      Zn → Zn²⁺                          Oxidation half

                      MnO₄⁻ → Mn²⁺                  Reduction half

Balancing of atoms(in acidic medium)

                     Zn → Zn²⁺

                    MnO₄⁻ + 8H⁺ → Mn²⁺ + 4H₂O

Balancing of charge

                   Zn → Zn²⁺ + 2e⁻

                    MnO₄⁻ + 8H⁺ + 5e⁻→ Mn²⁺ + 4H₂O

Balancing of electrons

         Multiply the oxidation half by 5 and reduction half by 2:

                          5Zn → 5Zn²⁺ + 10e⁻

                        2MnO₄⁻ + 16H⁺ + 10e⁻→ 2Mn²⁺ + 8H₂O

Adding up the two equations gives:

              5Zn + 2MnO₄⁻ + 16H⁺ + 10e⁻ → 5Zn²⁺ + 10e⁻ + 2Mn²⁺ + 8H₂O

The net equation gives:

         5Zn + 2MnO₄⁻ + 16H⁺ → 5Zn²⁺ + 2Mn²⁺ + 8H₂O

8 0
3 years ago
Gold can undergo transmutation. Which equation could correctly describe this radioactive decay?
drek231 [11]
The answer is B i know this because i just took it
7 0
3 years ago
Read 2 more answers
What are some of the most common "chemicals" you use around your home on a daily basis? And what do you use those chemicals for?
elena55 [62]

Answer:

You use Bleach, Dimethyl Ammonium Chloride, Sodium Nitrite, Ethyl benzyl Ammonium Chloride, Lemon citrus, Baking soda, ETC

Explanation:

You use these in some of your cleaning supplies and home-made remedies.

5 0
2 years ago
4 Identify Give an example of a physical change and an example of a chemical change.
AysviL [449]

Answer:

Answer below

Explanation:

Physical changes dont change the chemical makeup of an object. An example would be to tear a piece of paper. Tearing the paper doesnt change how the paper was made chemically

Chemical changes on the other hand do change the chemical makeup of an object. An example of a chemical change would be to bake a cake. The reason being that the chemical makeup of the cake batter is changed so that the actual cake is formed.

8 0
2 years ago
How many molecules are in 1.2 moles of H20?​
Otrada [13]
<h3>Answer:</h3>

7.226 × 10^23 molecules.

<h3>Explanation:</h3>
  • A compound is a substance that is made by two or more atoms from different elements.
  • A mole of a compound contains a number of molecules equivalent to Avogadro's number,  6.022 × 10^23.
  • That is, one mole of a compound contains 6.022 × 10^23 molecules.

In this case we are given;

Number of moles of H₂O as 1.2 moles

But, 1 mole of H₂O contains 6.022 × 10^23 molecules.

We are required to calculate the number of molecules present;

  • To calculate the number of molecules we are going to multiply the number of molecules in one mole by the number of moles.
  • Therefore;

Number of molecules = 1.2 moles × 6.022 × 10^23 molecules/mole

                                    = 7.226 × 10^23 molecules.

Thus, 1.2 moles of water contains 7.226 × 10^23 molecules.

4 0
3 years ago
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