At standard pressure, CH4 boils at 112 K and H2O boils at 373 K. What accounts for the higher boiling point of H2O at standard pressure?(1) covalent bonding (3) hydrogen bonding(2) ionic bonding (4) metallic bonding

Answers

Answer 1

Answer: The answer is (3) hydrogen bonding. This is a question of intermolecular forces. H2O is highly polar (the O—H bond is particularly polar since O is so electronegative), and CH4 is about as nonpolar as it gets. So, while H2O molecules are held together by relatively strong hydrogen bonds (which, keep in mind, are not actually bonds), CH4 molecules are held together by much weaker London dispersion/Van der Waals forces. Thus, it takes more thermal energy to separate H2O molecules, and H2O therefore has a higher boiling point.

Answer 2

Answer:

Hydrogen bonding

Explanation:

Castle learning

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Which statement about a system at equilibrium is true?(1) The forward reaction rate is less than the reverse reaction rate.(2) The forward reaction rate is greater than the reverse reaction rate.(3) The forward reaction rate is equal to the reverse reaction rate.(4) The forward reaction rate stops and the reverse reaction rate continues.
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In a nuclear power plant control rods are used to

Answers

Control rods are used in nuclear reactors to control the fission rate of uranium and plutonium. They are composed of chemical elements such as boron, silver, indium and cadmium that are capable of absorbing many neutrons without themselves fissioning.

Disccuss what happens to copper in photochromic lenses from a redox perspective.

Answers

The simplest ion that copper forms in solution is the typical blue hexaaquacopper(II) ion - [Cu(H2O)6]2+

A substance whose shape can easily change is aa. solid.
b. powder.
c. fluid.
d. metal.

Answers

Answer:

The correct answer is the option:

c. fluid.

Explanation:

Hello!

Let's solve this!

A substance that can change its shape quickly is a fluid. Fluids have the property of adapting to the shape of the container that contains them. So you can easily change shape.

After the explanation, we conclude that the correct answer is the option:

c. fluid.

c. fluid
Fluids, like water for example, can quickly change shape and conform to their surroundings.

A radioactive nuclide is used to detect eye tumors. An atom of this radionuclide contains 15 protons, 15 electrons, and 17 neutrons. Which is symbol of this radionuclide?

Answers

The answer is phosphorus-32.

We know that the atom contains 15 protons, 15 electrons, and 17 neutrons.
To conclude of which element this radionuclide is, we need to know an atomic number of the element. The atomic number of the element is the number of proton in the nucleus of the atom. If the number of protons is 15, then the atomic number is 15. The element with atomic number 15 is phosphorus (according to the periodic table).
To conclude which phosphorus isotope this radionuclide is we need to know the mass number of the element. The mass number of the element is the sum of the number of protons and number of neutrons in the nucleus of the atom. If the number of protons is 15 and the number of neutrons is 17, then the mass number is 17 + 15 = 32.
Thus, this radionuclide is phosphorus-32.

Knowing that the number of protons of an element is equivalent to its atomic number, it can be determined from the periodic table of elements that this radionuclide is phosphorus. Since the number of its neutrons is 17, it can also be determined that its atomic mass is n + p = 15 + 17 = 32. This means the isotope is phosphorus-32.

A researcher is designing a laboratory experiment to determine whether the inorganic substance A affects the rate of a reaction between two colored liquids, X and Y. When the reaction is complete, the liquid is clear. The reaction between X and Y is similar to one used by manufacturers to produce certain chemicals in factories. Which method would best answer his question about reaction rate and what will he find out about substance A?

Answers

Answer : First, he should measure how long it takes for the liquid to become clear if X and Y are mixed together. Then, he should measure how long it takes if he also adds substance A to X and Y. He will find out if substance A is a catalyst

Explanation : Measuring the time taken for the liquid to become clear when X and Y were mixed together will give an assumption about the reaction time and the rate of reaction.

Then same measurement should be done when the substance A is added to the liquid of X and Y mixture. If there is a fast reaction that occurs when A is added to the reaction mixture then it can be concluded that A acts as an catalyst for mixing X with Y. Also, by comparing the reaction rates of both the reaction it can be easily concluded that A was a catalyst or not.

Answer:

The answer is B

Explanation:

Just did the test and got it right

Predict what kind of energy process happens when Lye, NaOH(s) is put in water and the water gets hot

Answers

Answer:

Exergonic process

Explanation:

A reaction in which the change in free energy is negative is what is termed an exergonic reaction. Energy is released into the surrounding medium in this type of reaction.

When pellets of NaoH is dissolved in water, energy in the form of heat is released into the medium and the solution gets hot.

Hence, the dissolution of NaoH in water is said to be exergonic.

what happens is that the sodium solution when put in water reacts and creates thermal energy .

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