CHEMISTRY HIGH SCHOOL

Given the balanced equation representing a reaction occurring in an electrolytic cell:

Answers

Answer 1
Answer: An electrolytic cell where electrolysis occurs which consists of an electrolyte where current from an outside source is passed through in order to produce an electrochemical cell.

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A 0.100 M solution of K2SO4 would contain the same total ion concentration as which of the following solutions?0.0800 M Na2CO3 0.100 M NaCl 0.0750 M Na3PO4 0.0500 M NaOH

Answers

Answer:

  • The third chice: 0.0750 M Na₂SO₄

Explanation:

Assume 100% ionization:

1) 0.100 M solution K₂SO₄

  • K₂SO4 (aq) → 2K⁺ (aq) + SO₄²⁻ (aq)

  • Mole ratios: 1 mol K₂SO4 : 2 mol K⁺  + 1 mol SO₄²⁻ (aq) : 3 mol ions. This is 1 : 3

  • At constant volume, the mole ratios are equal to the concentration ratios (M).

  • 1  M K₂SO₄: 3 M ions = 0.100 M K₂SO₄ / x ⇒ x = 0.300 M ions

This means, that you have to find which of the choices is a solution that contains the same 0.300 M ion concentration.

2) 0.0800 M Na₂CO₃

  • Na₂CO₃ (aq) → 2 Na⁺ + CO₃⁻

  • 1 M Na₂CO₃ / 3 M ions = 0.0800M / x ⇒ x = 0.0267 M ions

This is not equal to 0.300 M, so this solution would not contain the same total concentration as a 0.100 M solution of K₂SO₄, and is not the right answer.

3)  0.100 M NaCl

  • NaCl → Na⁺ + Cl⁻

  • 1 M NaCl / 2 M ions = 0.100 M NaCl / x ⇒ x = 0.200 M ions

This is not equal to 0.300 M ion, so not a correct option.

4) 0.0750 M Na₃PO₄

  • Na₃PO₄ → 3Na⁺ + PO₄³⁻

  • 1 M Na₃PO₄ / 4 M ions = 0.0750 M Na₃PO₄ / x ⇒ x = 0.300 M ions

Hence, this ion concentration is equal to the ion concentration of a 0.100 M solution of K₂SO₄, and is the correct choice.

5)  0.0500 M NaOH

  • NaOH → Na⁺ + OH⁻

  • 1 M NaOH / 2 mol ions = 0.0500 M NaOH / x ⇒ x = 0.100 M ions

Not equal to 0.300 M, so wrong choice.

The Metal Wire In An Incandescent Lightbulb Glows When The Light Is Switched On And Stops Flowing When It Is Switched Off. This Simple Process Is Which Kind Of Change?

Answers

Answer: physical change

Explanation:

A physical change is defined as a change in which there is alteration in shape, size etc. No new substance gets formed in these changes

Example: Melting of ice

A chemical change is defined as a change in which a change in chemical composition takes place. A new substance is formed in these changes.

Example: Corrosion of iron called as rusting.  

Thus when the metal wire in an incandescent light bulb glows when the light is switched on and stops flowing when it is switched off is just a physical change as there is no change in chemical composition.
Physical Change. If matter is not chemically changing, then its a physical change.

1. The following reaction does not proceed to form a product: H2O + Au---> no reaction. Why is that?A) Gold has a higher activity than hydrogen and cannot replace it.
B) Gold has a lower activity than hydrogen and cannot replace it.
C) The reaction cannot occur because water is a reactant.
D) The reaction proceeds too slowly to create products.


2. Which of the following is the balanced form of the equation C2H6 + O2 --> CO2 + H2O?

answer choices are attached A,B,C,D top to bottom

3. The equation 2NaNO3 + CaCl2 ---> 2NaCl + Ca(NO3)2 is balanced. How many atoms of sodium (Na) are there on either side of the equation?

A) one
B) two
C) four
D) six

4. All single-displacement reactions can be classified as another type of reaction as well. What type of reaction is that?

A) combustion
B) redox
C) synthesis
D) decomposition

5. If ions change places and a gas is formed, then what type of reaction is indicated?

A) double-displacement
B) synthesis
C) decomposition
D) single-displacement

Answers

1. B
The positive charge in water is provided by hydrogen, and gold provides the same charge. However, gold is not more reactive than hydrogen so it can not replace it in the compound.

2. In order to balance the equation, you must sure there are equal moles of each element on the left and right side of the equation:
2C₂H₆ + 7O₂ → 4CO₂ + ₆H₂O

3. The number of moles of sodium atoms on the left of the equation must be equal to the number of moles of sodium atoms on the right, as per the law of conservation of mass. The answer is B.

4. C.
A synthesis reaction usually results from single displacement because some element or compound is produced in its pure form

5. B. 
The gas being produced is being synthesized.

Cause and effect of local winds?

Answers

Local winds are caused by the different surfaces on each lands which heat up differently based on climate and its temperature. This is a complete difference in temperature, and therefore causes a difference in pressure as well. This is capable of causing the air to move differently based on the actual location.

The energy needed to get a reaction started is thea. enzyme energy.
b. activation energy.
c. catalyst energy.
d. chemical energy.

Answers

Activation energy is the energy needed to start a chemical reaction. The correct answer to the given question is option   b. activation energy.

The energy needed to get a reaction started is called the activation energy. It is the minimum amount of energy required for a chemical reaction to occur. Activation energy is needed to break the existing bonds in reactant molecules and form new bonds to produce product molecules.

The correct answer to the given question is option   b. activation energy.

For more such questions on Activation energy, click on:

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The energy needed to get a reaction started is the activation energy. 

A catalyst speeds up a reaction, as well as an enzyme, and chemical energy is just a form of energy. 

Answer: Activation energy 

How much heat is released by the combustion of 2 mol of methane?
Use mc019-5.jpg.

Answers

From literature, the heat of combustion of methane is 55.5 MJ/kg methane. to account for the 2 mol of methane given we convert 2 mol to kg which is determined by multiplying 2 mol by molec.weight (16g/mol) divided by 1000 to convert to kg. This is equal to 0.032 kg methane. We multiply this to 55.5 MJ/kg.The total heat released is 1.776 MJ.
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