How many protons does the element cobalt (Co) have? 27 32 58.93 59

1) Answer is: D. both B and C.

Activated complex  is collection of intermediate structures in a chemical reaction that forms while bonds are breaking and new bonds are forming.

The transition state is the configuration at the peak of the diagram while the activated complex can refer to any point near the maximum.

Activation energy is the minimum energy colliding particles must have in order to react.

2) Answer is: B. chemical equilibrium.

Balanced chemical reaction: A + B ⇄ C + D.

1) In a chemical reaction, chemical equilibrium is the state in which both reactants ( and BA) and products (C and D) are present in concentrations which have no further tendency to change with time.  

2) At equilibrium, both the forward and reverse reactions are still occurring.

3) Reaction rates of the forward and backward reactions are equal and there are no changes in the concentrations of the reactants and products.

3) Answer is: C. inhibitor.

Inhibitor is a substance that decreases the rate of a chemical reaction.

Inhibitor can reduce the effectiveness of a catalyst in a catalysed reaction.

Catalysis is the increase in the rate of a chemical reaction due to the participation of an additional substance called a catalyst.  

Reactions occur faster with a catalyst because they require less activation energy.  

4) Answer is: A. Fe.

Balanced reaction: Fe + 2HCl → FeCl₂ + H₂.

Oxidation reaction: Fe⁰ → Fe⁺² + 2e⁻.

Reduction reaction: 2H⁺ + 2e⁻ → H₂⁰.

Reducing agent is an element or compound that loses an electron to another chemical species in a redox chemical reaction and they have been oxidized.

Iron (Fe) change oxidation number from 0 to +2 (lose electrons), iron is oxidized (reducing agent).

Answer :

1) The correct option is, (D) both B and C.

2) The correct option is, (D) both A and B

3) The correct option is, (C) inhibitor.

4) The correct option is, (A) Fe

Explanation :

For part 1 :

Activated complex or transition state : It is the state where the bonds are loosened and new lose bonds are formed between them. It is unstable state and immediately dissociates to form the stable products. The arrangement of atoms takes place at the peak of the activation energy barrier.

For part 2 :

The balanced chemical reaction is,

Chemical equilibrium : It is defined as a state where the rate of forward reaction is equal to the rate of backward reaction. That means there is no net change in the concentration of the reactants and the products.

Reversibility : It is defined as, in a reversible reaction when reactant A and B react to form products C and D and in the reverse reaction, C and D react to form A and B. That means process is reversible.

For part 3 :

Inhibitor : It is the substance that decreases the rate of the chemical reaction. It can reduce the effectiveness of the catalyst in a catalyzed reaction.

Or we can say that it is a substance that interferes with the action of a catalyst.

For part 4 :

The balanced redox reaction is :

The half oxidation-reduction reactions are:

Oxidation reaction :

Reduction reaction :

From this we conclude that the 'Fe' is the reducing agent that loses an electron to another chemical species in a redox chemical reaction and itself oxidized.

Hence, the reducing agent is, Fe

Answer:

The answer to your question is 2.84 M

Explanation:

Data

mass of MgO = 57.3 g

volume of the solution = 500 ml

Process

1.- Calculate the molar mass of MgO

MgO = 24.3 + 16 = 40.3 g

2.- Calculate the moles of MgO

                 40.3 g MgO ----------------- 1 mol

                  57.3 g MgO -----------------  x

                          x = (57.3 x 1) / 40.3

                          x = 1.42 moles

3.- Calculate the Molarity

Molarity = moles / volume (l)

Volume = 0.5 liters

-Substitution

Molarity = 1.42 / 0.5

-Result

Molarity = 2.84

Final answer:

The molarity of the solution is 2.84 M.

Explanation:

To find the molarity of the solution, we need to first calculate the number of moles of MgO and the volume of the solution.

First, we convert the mass of MgO to moles using its molar mass. The molar mass of MgO is 40.31 g/mol, so:

moles of MgO = mass of MgO / molar mass of MgO

moles of MgO = 57.3 g / 40.31 g/mol = 1.42 mol

Next, we convert the volume of the solution to liters:

volume of solution = 500.0 mL / 1000 mL/L = 0.500 L

Finally, we divide the number of moles of MgO by the volume of the solution to find the molarity:

molarity = moles of solute / volume of solution

molarity = 1.42 mol / 0.500 L = 2.84 M

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Alloys are used because of their strength, resistance to corrosion, appealing appearance and ability to be easily formed.

What is corrosion resistance?

Corrosion resistance: Alloys are resistant to corrosion and rust, which makes them an ideal material for the outer casing of ballpoint pens.

The pen's exterior can be exposed to air and moisture, but the alloy will not corrode or rust, ensuring that the pen remains in good condition for a longer period.

Durability: Alloys are typically stronger and more durable than pure metals, which makes them ideal for use in ballpoint pens.

Ballpoint pens undergo a lot of wear and tear during regular use, such as being dropped, knocked around, or exposed to high temperatures. Using an alloy ensures that the pen will not bend, break, or become deformed easily, which prolongs the life of the pen.

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The number of valence electrons that a neutral atom of aluminum has is 3 valence electrons.

What are valence electrons?

Valence electrons are those electrons in the outermost parts of elements that can be combined or loned to other elements during chemical reactions. Aluminum has three electrons in the valence shell.

The total number of electrons that aluminum has is 13 and the 3P1 shell has three electrons. So, this is the number of valence electrons.

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Answer:

Aluminum has 13 electrons in a neutral atom. The 1S2, 2S2 and 2P6 shells are full, and so is the 3S2. The 3P1 shell has one electron in it (in Al's neutral atom) and that gives aluminum one lone valence electron and two "semi-valence" electrons which can be loaned out.

Explanation: