CHEMISTRY HIGH SCHOOL

Hydrogen bonding is a type of(1) strong covalent bond
(2) weak ionic bond
(3) strong intermolecular force
(4) weak intermolecular force

Answers

Answer 1
Answer: Option 3. strong intermolecular force

Certain substances such as H2O, HF, NH3 from hydrogen bonds, and the formation of which affects properties (mp,bp,solubility) of substance. Other compounds containing OH and NH2 groups also form hydrogen bond. Molecules of many organic compounds such as alcohols, acids, amines, and amino acids contain these groups, and thus hydrogen bonding plays an important role in biological science.

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THe following elements are found in what part of the periodic table Germanium, astatine, tellurium, and arsenic?
Which sequence describes the result of increasing the number of gas particles in a container? A.) fewer collisions --> lower collision force --> lower pressure B.)more collisions --> lower collision force --> lower pressure. C.) fewer collisions --> greater collision force -->higher pressure. D.)more collisions --> greater collision force --> higher pressure
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On the basis of electronegativity, which pair of elements is most likely to form monatomic ions? responses a. Ba and O b. Cs and Rb c. O and F d. Na and K

Compare gases with liquids and solids according to the kinetic molecular theory

Answers

Solids molecules are tightly held together in close bonds,they could bend or vibrate but still stay bonded. So they have little k.e Liquid molecules are much loser than solid,its bond are flexible enough to slide over eachother. So it has greater k.e compared to solid Gas molecules are the most loosed,they take the shape of the container thus its molecules moves freely colliding btw themselves and its container. So gas has the greatest k.e amongs the rest

One group of scientists has proposed a new theory on Adaptation. A majority of scientists worldwide agree with the theory. The theory is most likelyA.biased.
B.incomplete.
C.accurate.
D.unchangeable.

Answers

The theory is most likely accurate and the main reason behind this process of thinking is because a majority of the scientists around the world agree with the theory. It can never be biased or incomplete. The correct option among all the options that are given in the question is the third option or option "C".

Answer: The correct answer is-

C.accurate.

As per the information in the question, a group of scientists has proposed a new theory on Adaptation, which is accepted by majority of scientists worldwide. This indicates that the proposed theory is most likely to be accurate.

A scientific theory is an explanation of certain aspects of nature that is based on some facts as well as evidences. It is tested, observed, and proven right on the basis of repeated experimentation.

As the theory on Adaptation is accepted by majority of the scientists, it means that it is most likely to be accurate.

Thus, option C) is the right answer.

An unstable nucleus loses the most mass if the nucleus emits(1) an alpha particle (3) a positron
(2) a beta particle (4) a gamma ray

Answers

1. an alpha particle

gamma rays are formally massless, positrons and electrons (beta particles) have negligible mass, but alpha particles have about 4 amu of mass

A solution contains 15 g Na₂CO₃ and 235 g if H₂O? What is the mass% of the solution?​

Answers


The total mass of the solution is 15 g (Na₂CO₃) + 235 g (H₂O) = 250 g (solution).

Now, let's calculate the mass percent of Na₂CO₃:
Mass percent of Na₂CO₃ = (mass of Na₂CO₃ / total mass of solution) * 100
= (15 g / 250 g) * 100
= 6%

Therefore, the mass percent of Na₂CO₃ in the solution is 6%.

Final answer:

The mass percent of a solution is calculated by dividing the mass of the solute by the total mass of the solution and multiplying by 100%. In this case, the solute is Na₂CO₃ and the solvent is H₂O. The calculation yields a mass percent of 6% for Na₂CO₃ in the solution.

Explanation:

To calculate the mass percent of a solution, we need the mass of the solute and the mass of the solution (which is the sum of the masses of the solute and the solvent). In your given solution, you have 15 g of Na₂CO₃ (solute) and 235 g of H₂O (solvent). Therefore, the total mass of the solution is 15 g (Na₂CO₃) + 235 g (H₂O) = 250 g.

Now, to find the mass percent of Na₂CO₃ in the solution, we use the following formula:

Mass percent = (mass of solute / total mass of solution) × 100%

Substitute the known values into the formula, we get:

Mass percent = (15 g / 250 g) × 100% = 6%

So, the mass percentage of Na₂CO₃ in the H₂O solution is 6%.

Learn more about mass percent here:

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Which solution would most likely cause a plant placed in it to become firmer and more rigid? A. hypertonic B. hypotonic C. isotonic D. osmotic

Answers

"Hypotonic" is the one solution among the choices given in the question that would most likely cause a plant placed in it to become firmer and more rigid. The correct option among all the options that are given in the question is the second option or option "B". I hope the answer has come to your great help.

How many sigma and pi bonds are there in phenol?

Answers

In the most simple phenol, 
sigma bond = 7
pi bond = 3

Higher classes of phenol may have more number of bonds. so, don't confuse from that!

Hope this helps!
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