CHEMISTRY HIGH SCHOOL

Which of the following contains both ionic and covalent bonding?KOH
N2O5
CH4
HBr

Answers

Answer 1

Answer:

Answer: KOH

Explanation:

Being KOH the only not binary compound it is the candidate to be the one with two different type of bondings.

In fact, KOHis a ionic compound because the cation K⁺ forms a ionic bond with the anion OH⁻.

On the other hand, the oxigen and hydrogen atoms in OH⁻ are covalently bonded.

The ionic bond is the result of the union of two atoms with a high elecronegativity difference, while the covalent bonding is the result of a combination of two atoms whose electronegativities is not so different.

Being K and alkali metal (the elements with lowest electronegativity) and OH⁻ an anion, they easily form the ionic bond.

From tables, the electronegativity of H is 2.20 and the electronegativity of O is 3.16, which leads to a difference of 3.16 - 2.20 = 0.96. This difference is not enough to form ions but covalent bonds. That is why the bond O-H is covalent.

When you analyze the bonds of the other choices, N-O, C-H, and H-Br, y ou conclude that the electronegativities lead to covalent bonds too.

Answer 2

Answer:

N2O5 contains both ionic and covalent bonding. The Option B.

Why does N2O5 contain both ionic and covalent bonding?

N2O5 also known as dinitrogen pentoxide, contains both ionic and covalent bonding. In this compound, the nitrogen atoms (N) form covalent bonds with each other resulting in the formation of a covalent molecule.

But the compound also contains oxygen atoms (O) that bond with the nitrogen atoms through ionic bonding. The oxygen atoms gain electrons from the nitrogen atoms leading to the formation of negative ions (NO3-) and positive ions (N2O4+).

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How does a scientific theory compare to a scientific law?

Answers

Answer:

Explanation:

Scientific theory is an in-depth explanation of the observed phenomenon. A law is a statement about an observed phenomenon or a unifying concept.

Compared to the freezing point of 1.0 M KCl(aq) at standard pressure, the freezing point of 1.0 M CaCl2(aq) at standard pressure is(1) lower
(2) higher
(3) the same

Answers

Answer : The correct option is, (1) lower

Explanation :

Formula used for lowering in freezing point :

$\Delta T_f=i* k_f* m$

where,

$\DeltaT_b$ = change in freezing point

$k_b$ = freezing point constant

m = molality

i = Van't Hoff factor

According to the question, we conclude that the molality of the given solutions are the same. So, the freezing point depends only on the Van't Hoff factor.

Now we have to calculate the Van't Hoff factor for the given solutions.

(a) The dissociation of $KCl$ will be,

$KCl\rightarrow K^++Cl^-$

So, Van't Hoff factor = Number of solute particles = 1 + 1 = 2

(b) The dissociation of $CaCl_2$ will be,

$CaCl_2\rightarrow Ca^(2+)+2Cl^-$

So, Van't Hoff factor = Number of solute particles = 1 + 2 = 3

The freezing point depends only on the Van't Hoff factor. That means higher the Van't Hoff factor, lower will be the freezing point and vice-versa.

Thus, compared to the freezing point of 1.0 M $KCl(aq)$ at standard pressure, the freezing point of 1.0 M $CaCl_2(aq)$ at standard pressure is lower.

Cigarettes contain many chemicals. Which of the following chemicals is the addictive component to cigarettes?a. tar
b. nicotine
c. carbon dioxide
d. carbon monoxide

Answers

B is the correct answer, thankyou.

What is the total mass of oxygen in 1.00 mole of Al2(CrO4)3

Answers

1 mol of this atom would yield 12 moles of Oxygen, (using the number of atoms that they gave in 1 molecule of Al2(CrO4)3. Therefore, the atomic mass of Oxygen is 16, and there are 12 moles of Oxygen atoms. In total, the mass would be 12 * 16 = 192 grams of Oxygen.

Final answer:

The compound Al2(CrO4)3 contains 12 oxygen atoms per formula unit. Knowing that one mole of oxygen atoms has a mass of 16.00 grams, the total mass of oxygen in 1.00 mole of Al2(CrO4)3 is $12 * 16.00 = 192.00$ grams.

Explanation:

The primary task here is to find the total mass of oxygen in 1.00 mole of Al2(CrO4)3. This is a classic chemistry problem that involves understanding the composition and molar mass of compounds. In the compound Al2(CrO4)3, the subscript 3 after (CrO4) means there are three chrome tetraoxides in one formula unit of the compound.

Every CrO4 ion is composed of one chromium atom and four oxygen atoms. Therefore, three CrO4 ions will contain 3 * 4 = 12 oxygen atoms.

Knowing that one mole of oxygen atoms weighs approximately 16.00 grams, we can find the total mass of oxygen in the compound by multiplying this molar mass by the number of oxygen atoms. Again, in one mole of Al2(CrO4)3 we have 12 oxygen atoms, hence $12 * 16.00 g = 192.00$ grams.

So, the total mass of oxygen present in 1.00 mole of Al2(CrO4)3 is 192.00 grams.

Learn more about Molar Mass here:

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The atomic number is the _____. atomic mass number of neutrons protons plus the neutrons number of protons

Answers

The atomic number of an atom is determined by the number of protons present in the atom that is the atomic number and number of protons are same for an atom. It is unique for every atom.

Atomic mass: It is nearly equals to the sum of mass of subatomic particles present in the atom that is sum of proton and neutron.

Number of neutrons: in an atom, the number of neutrons are always equal to the number of protons. If the number of neutrons are different for a number of proton then it is said be an isotope of that atom.

Protons plus neutrons: Sum of number of protons and number of neutrons is said to be the mass number of that atom.

Hence, the atomic number is the number of protons.

It's the number of protons.
The table of elements organizes the elements by their number of protons/the atomic number as the number of protons of an element is fixed, unlike the number of electrons and neutrons.

Which of the following bodily organs or systems can be affected by ionizing radiation? Glands,
Eyes,
Genitals,
Nervous system,
Gastrointestinal system?

Answers

The correct answer is the fourth option. The nervous system is the system in the body which can be affected by ionizing radiation. Exposure to this kind of radiation may lead to changes in motor function or neurological disorders.

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