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➷ It would be B. An Ion.
Ions aren't found in atoms - it is atoms that can become ions by gaining or losing electrons.
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Answer: 3.01 x 10^24 atoms
Explanation:
Based on Avogadro's law:
1 mole of any substance has 6.02 x 10^23 atoms
So, 1 mole of SI = 6.02 x 10^23 atoms
5.0 moles = Z atoms
To get the value of Z, cross multiply:
(Z atoms x 1 mole) = (6.02 x 10^23 atoms x 5.0 moles)
Z atoms•1 mole = 30.1 x 10^23 atoms•moles
Divide both sides by 1 mole
Z atoms•1 mole / 1 mole = 30.1 x 10^23 atoms•moles / 1 mole
Z = 30.1 x 10^23 atoms
[Place Z in standard form
So, Z = 3.01 x 10^24 atoms]
Thus, there are 3.01 x 10^24 atoms in 5.0 moles in SI
Answer:
1. The change in energy is 60KJ or 6.0 × 10^1 KJ
2. Endothermic reaction
Explanation:
The Enthalpy (ΔU) for the mixture is given as 215kJ and the workdone (W) on the mixture is - 155KJ. Hence, the change in the energy (ΔH) ofthe mixture is computed using the equation below:
ΔH = ΔU + w
Where,
ΔH= Change in energy
ΔU= Enthalpy change
W= workdone
Therefore ΔH is:
ΔH= 215 kJ + (-155Kj)
ΔH= 60 KJ
Therefore, the change in energy is 60KJ or 6.0 × 10^1 KJ
The value is positive so it is an endothermic reaction.
An endothermic reaction happens when the energy used to break the bonds in the reactants is higher than the energy given out when bonds are formed in the products. This means that the entire reaction takes in energy, hence there is a temperature decrease in the surroundings. Endothermic reactions cannot happen spontaneously. Work is usually done in order to get these reactions to occur. When endothermic reactions absorb energy, a temperature drop is measured by the reaction.
Answer:
[KMnO₄] = 0.71 M
Explanation:
Solute: Potassium permanganate, molar mass 158.04 g/mol
Solvent: Water, volume of 100 mL
We convert the mass of solute to moles:
11.3 g . 1mol / 158.04g = 0.071 moles
We asume the solvent's volume as the solution's volume
We convert the volume from mL to L → 100 mL . 1L / 1000 mL = 0.1L
Molarity (mol/L) → moles of solute in 1L of solution
Molarity → 0.071 moles / 0.1 L = 0.71M
Answer:
- <em>A potassium atom </em><em><u>loses one electron</u></em><em> and forms </em><em><u>one</u></em><em> ion.</em>
- <em>A sulfur atom </em><em><u>gains two electrons</u></em><em> and forms </em><em><u>one</u></em><em> ion.</em>
Explanation:
Indeed, in virtue of their electron configuration, metals can react with nonmetals by the former donating one or more electrons, from their valence electron shell, which the latter can accept.
The reaction in which a metal loses electrons and forms a positive ion (cation), while a nonmetal gains those electrons and forms a negative ion (anion) is the formation of a ionic compound, which is a chemical reaction.
The chemical reactions happen in virtue of sharing, accepting or donating electrons, mainly from the valence electron shells of the atoms. Protons and neutrons are not exchanged, loss or gained in chemical reactions. The reactions in which protons and neutrons can take part are nuclear reations (not chemical reactions).
<em>Potassium</em> (Z = 19) has one valence electron, so it can lose it to form the cation K⁺, with one positive charge; while <em>sulfur</em> (Z = 16) has 6 valence eletrons, making it possible for it gaining two electrons to form the anion S²⁻.
Then, each S²⁻ ion can combine with two K⁺ ions to form the ionic compound, K₂S, potassium sulfide. See that two potassium atoms combine with one sulfur atom to form one unit of the ionic compound.
