CHEMISTRY HIGH SCHOOL

What types of elements- metals,nonmetals, or metalloids require
the most energy to remove an
electron?
Why do these elements have a higher ionization energy?

Answers

Answer 1

Answer:

Answer:

Noble gases

Explanation:

The noble gases are non-metals that requires the highest amount of energy to remove an electron from their shells.

The reason for this difficult is that their electronic configuration confers a stable configuration them.

The ionization energy is the energy required to remove the most loosely held electrons in an atom.
Due to the special stability of noble gases, it is very difficult to remove electrons from an atom of noble gases.

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The balanced chemical equation for the reaction between PCl5 and water is given below. If 3.45 moles of HCl are produced, how many moles of water reacted?PCl5 + 4H2O -> H3PO4 + 5HCl

4 × 10-5 cm in scientific notation

Answers

Answer:

400000

Explanation:

First, figure out what 10^5 is. It is 100000. Then multiply it by 4 and there is your answer!

Also if it is 4x10^-5, it is 0.00004!

Oh yeah! If you want it to be in scientific notation, it is: 4x10^5

Since that I didn't quite understand what you are trying to question, it is either 4x10^5 or 4x10^-5!

The first person to use the term "atom" was _____. Dalton Democritus Aristotle the Egyptians

Answers

the term atom comes from Greek. Democritus was the first person to use the name.

Democritus. Is. The. Correct. Answer I. Hope this will be helpful

What is the mass percent of sodium in NaCl?

Answers

The mass percent of sodium in NaCl can be determined by dividing the mass of sodium by the total mass of the compound (NaCl), then multiplying the result by 100. So, 39.34% of the mass of sodium in NaCl is composed of sodium.

The molecular weight of chlorine (Cl) is 35.45 g/mol while that of sodium (Na) is 22.99 g/mol.

The molecular weight of NaCl is calculated as follows:

Na: 1 atom * 22.99 g/mol = 22.99 g/mol
Cl: 1 atom * 35.45 g/mol = 35.45 g/mol

Total molecular weight = 22.99 g/mol + 35.45 g/mol = 58.44 g/mol

To determine the sodium mass percent in NaCl:

(mass of sodium / total mass of NaCl) * 100 to get the mass percent of sodium.

(22.99 g/mol / 58.44 g/mol) x 100 = 39.34% sodium mass percent

As a result, 39.34% of the mass of sodium in NaCl is composed of sodium.

Learn more about Mass percent, here:

brainly.com/question/14990953

#SPJ6

mass percent of sodium is mass of sodium divided by total mass of NaCl then multiplied by 100%. That means that percent mass equals (23g/58.45g)×100% which equals 39.3%.
Therefore the percent mass of sodium in NaCl is 39.3%
I hope this helps. Let me know if anything is unclear.

1. In a compound, chemical energy is contained in the (1 point)a. nuclei of the atoms.
b. unbonded electrons.
c. bonds.
d. movement of the electrons.

2. Which of the following statements is true about what happens during a chemical reaction? (1 point)
a. Bonds of the reactants are broken, and bonds of the products are formed.
b. Bonds of the reactants are formed, and bonds of the products are broken.
c. The bonds of both the reactants and the products are broken.
d. The bonds of both the reactants and the products are formed.

Answers

1. Potential of a chemical substances to undergo transformation in a chemical reaction is known as chemical energy. The chemical energy is stored in the bonds of chemical compounds.

Hence, in a compound, chemical energy is contained in bonds.

2. The process in which one or more substance known as reactants are converted to one or more completely new substances known as products are formed is known as a chemical reaction.

Hence, during a chemical reaction bonds of the reactants are broken, and bonds of the products are formed.

1.C 2.A are the answer to the following questions.

Which of the following is NOT a natural toxin that can contaminate food?a. Ciguatera
b. Methyl Mercury
c. Aflatoxins
d. Dioxins

Answers

Option b. Methyl Mercury (quick silver)

It is a metal that is liquid at room temperature. It's a poisonous mercury. it forms when bacteria react with mercury in water, soil, or plants. It's been used to preserve grain that is fed to animals. It's used in fluorescent lights, batteries, polyvinyl chloride and latex paint.

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