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3 years ago

Identify which of the bonds in calcium hydroxide, Ca(OH)2, are ionic and which are covalent.

Chemistry

2 answers:

Mandarinka [93]3 years ago

5 0

Answer:

The compound contains an Ca²⁺ ion and 2 OH⁻ ions ( this last ion is a polyatomic anion) These ions are held together by ionic bonds. OH- consists of oxygen and hydrogen ions bonded by a covalent bond

Explanation:

The covalent bond is the chemical bond between atoms where electrons are shared, forming a molecule. Covalent bonds are established between non-metallic elements, such as hydrogen H, oxygen O and chlorine Cl. These elements have many electrons in their outermost level (valence electrons) and have a tendency to gain electrons to acquire the stability of the electronic structure of noble gas and complete their valence layer.

An ionic bond is produced between metallic and non-metallic atoms, where electrons are completely transferred from one atom to another. During this process, one atom loses electrons and another one gains them, forming ions. Usually, the metal gives up its electrons forming a cation to the nonmetal element, which forms an anion. In this way, the octet rule is fulfilled, which establishes that the atoms of the elements bind each other in the attempt to complete their valence layer, leaving the atom stable with 8 electrons in its last layer.

Finally, a polyatomic anion is a group of two or more atoms that are chemically bonded and have a negative charge. They are considered as a unit in chemical reactions. Generalemte in this type of anions the electrons are shared by all the atoms of the polyatomic ion. Then a covalent bond is established. One of the most common polycation anions is the hydroxyl ion (OH-).

So, in this case, the compound contains an Ca²⁺ ion and 2 OH⁻ ions ( this last ion is a polyatomic anion) These ions are held together by ionic bonds. OH- consists of oxygen and hydrogen ions bonded by a covalent bond because it is a polyatomic where electrons are shared. And as previously mentioned, its negative charge means that the group of atoms has gained electrons.

ira [324]3 years ago

4 0

The bonds in calcium hydroxide, Ca(OH)2, calcium hydroxide, is formed by ionic bonds between Ca2 and OHA. Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions here.

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Komok [63]

Answer: The cell potential of the cell is +0.118 V

Explanation:

The half reactions for the cell is:

Oxidation half reaction (anode): $Ni(s)\rightarrow Ni^{2+}+2e^-$

Reduction half reaction (cathode): $Ni^{2+}+2e^-\rightarrow Ni(s)$

In this case, the cathode and anode both are same. So, $E^o_{cell}$ will be equal to zero.

To calculate cell potential of the cell, we use the equation given by Nernst, which is:

$E_{cell}=E^o_{cell}-\frac{0.0592}{n}\log \frac{[Ni^{2+}_{diluted}]}{[Ni^{2+}_{concentrated}]}$

where,

n = number of electrons in oxidation-reduction reaction = 2

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$[Ni^{2+}_{diluted}]$ = $1.00\times 10^{-4}M$

$[Ni^{2+}_{concentrated}]$ = 1.0 M

Putting values in above equation, we get:

$E_{cell}=0-\frac{0.0592}{2}\log \frac{1.00\times 10^{-4}M}{1.0M}$

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3 years ago

Neon (Ne) has an atomic number of 10. With only this information explain whether or not it is possible to determine the number o

DochEvi [55]

Answer:

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Explanation:

An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.

All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example if neutral atom has 6 protons than it must have 6 electrons. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.

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3 years ago

The decay constant for 14C is .00012 In 1947, the famous cave paintings in Lascaux, France were discovered and testing revealed

Andru [333]

The question is incomplete, here is the complete question:

The decay constant for 14-C is $0.00012yr^{-1}$ In 1947, the famous cave paintings in Lascaux, France were discovered and testing revealed that charcoal in the cave contained 20% of the 14-C found in living trees. Write a formula for the age of the charcoal (hence of the associated paintings). Show your work to find this formula.

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Explanation:

Carbon-14 isotope is a radioisotope and its decay process follows first order kinetics.

Rate law expression for first order kinetics is given by the equation:

$k=\frac{2.303}{t}\log\frac{[A_o]}{[A]}$

where,

k = rate constant = $0.00012yr^{-1}=1.2\times 10^{-4}yr^{-1}$

t = time taken for decay process = ? yr

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[A] = amount left after decay process = (100 - 20) = 80 grams

Putting values in above equation, we get:

$1.2\times 10^{-4}=\frac{2.303}{t}\log\frac{100}{20}\\\\t=\frac{2.303}{1.2\times 10^{-4}yr^{-1}}\log \frac{100}{20}$

Hence, the formula for the age of the charcoal is $t=\frac{2.303}{1.2\times 10^{-4}yr^{-1}}\log \frac{100}{20}$

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