How many molecules in a mole?

Answers

Answer 1

Answer:

Answer:

One mole of a substance is equal to 6.022 × 10²³ units of that substance (such as atoms, molecules, or ions). The number 6.022 × 10²³ is known as Avogadro's number or Avogadro's constant.

Explanation:

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37 Which general trends in first ionization energy and electronegativity values are demonstrated by Group 15 elements as they are considered in order from top to bottom?(1) The first ionization energy decreases and the electronegativity decreases.(2) The first ionization energy increases and the electronegativity increases.(3) The first ionization energy decreases and the electronegativity increases.(4) The first ionization energy increases and the electronegativity decreases.
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The Tacoma narrows bridge collapsed due to?A. Refraction
B. Reflection
C. Diffraction
D. Resonance

Answers

D. Resonance. the bridge was driven at its resonant frequency

Which of the following pairs of items will be attracted by one another?A. A positively charged pith ball and a negatively charged glass rod
B. Two positively charged pith balls
C. A negatively charged pith ball and a negatively charged glass rod
D. Two negatively charged pith balls

Answers

Answer : Option A) A positively charged pith ball and a negatively charged glass rod

Explanation : The pair of items that will be attracted by one another is a positively charges pith ball and a negatively charged glass rod.

According to the charge interactions rule, it is state that opposite charges always attract each other and like charges repel each other.

When opposite charges come near to each other there is a pull generated to get attracted, like a north and south pole of a magnets.

whereas when like charges are brought together they try to push each other in opposite direction, like north-north pole of magnets or south-south pole of magnets.

In the given example the pith ball is having positive charge which when brought near the negatively charged glass rod gets attracted.

A. Is the correct answer
Opposites attract

Please help !!!Which of the following alcohols is now commonly being used as fuel additive?

methyl alcohol
ethyl alcohol
isopropyl alcohol
none of the above

Answers

Out of the following alcohols we can conclude the correct answer choice by going through our options, looking at their chemical formulas/structures and defining their usage.

Ethyl alcohol (CH3CH2OH) : Most commonly found in alcoholic beverages.

Isopropyl alcohol (C3H8O) : Is what is known as rubbing alcohol, most commonly used as a cleansing liquid.

Methyl alcohol (CH3OH) : Is most commonly used as formaldehyde, jet fuel, and antifreeze.

So looking at our options we can conclude that the correct answer choice would be Methyl Alcohol because it is used as an additive in jet fuel.

Hope this helps! If you have any other questions or would like further explanation just let me know! :)

Actually the correct answer is B. Ethyl Alcohol.

Primary alcohols can be dehydrated to produce A) ethers B) organic acids C) esters D) aldehydes

Answers

Primary alcohols can be dehydrated to produce ethers. The correct option is A, ethers.

What is dehydration?

Dehydration reaction are those reactions in which there is loss of water. When aldehyde reacts with sulfuric acid, it forms alkenes with loss of water, in excess of acids.

When aldehyde reacts with acids, with excess of aldehyde, forms ether.

Thus, the correct option is A) ethers.

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They form alkenes, not sure what group that falls under but B,C, and D definitely cant be the answer

The bond formed from electrons that are transferred is a(n) ionic bond hydrogen bond covalent bond

Answers

Ionic bonds are formed from electrons completely transferred.

Hydrogen bonds are formed when a hydrogen atom is attracted to an atom with extremely high electronegativity. Hydrogen bonds can only be formed with O, N, or F atoms.

Covalent bonds are formed with the sharing of electrons between atoms.

Answer:A.) ionic bond

Explanation:

An atom of sodium-23 (Na-23) has a net charge of +1. identify the number of protons, neutrons, and electrons in the atom. How did you determine the number of each type. Explain in completer s details.

Answers

The correct number of neutrons is 12 while the number of protons is 11. That is because if the atomic number is 23, that means it's the isotope Na-23 and the atomic number is the sum of protons and neutrons. There are 11 protons as it can be seen on the periodic system. The number of electrons is 10 because it is positively charged, meaning that there's one electron fewer than the usual.

Protons: 11 - Neutrons: 12 - Electrons: 11. By analyzing the atomic number, mass number, and net charge, we can determine the number of protons, neutrons, and electrons in the sodium-23 atom.

The sodium-23 atom (Na-23) has a net charge of +1, which means it has one more proton than electrons. To determine the number of protons, neutrons, and electrons in the atom, we need to look at its atomic number and mass number.

The atomic number of an element represents the number of protons in its nucleus. Since the net charge of the sodium-23 atom is +1, it means there is one more proton than electrons. Therefore, the number of protons in the sodium-23 atom is 11.

The mass number of an atom is the sum of its protons and neutrons. To find the number of neutrons, we subtract the number of protons (atomic number) from the mass number. In this case, the sodium-23 atom has a mass number of 23, and since it has 11 protons, we can calculate the number of neutrons:

Mass number - Atomic number = Number of neutrons
23 - 11 = 12 neutrons

Lastly, to find the number of electrons, we need to consider the net charge. Since the sodium-23 atom has a net charge of +1, it means it is missing one electron to become neutral. Therefore, the number of electrons in the sodium-23 atom is 11.

In summary:
- Protons: 11
- Neutrons: 12
- Electrons: 11

By analyzing the atomic number, mass number, and net charge, we can determine the number of protons, neutrons, and electrons in the sodium-23 atom.