CHEMISTRY HIGH SCHOOL

Which types of bond is formed between the two chlorine atoms in a chlorine molecule?

Answers

Answer 1
Answer:

Answer: D - a nonpolar covalent bond

Explanation: because opposites attract?
Answer 2
Answer: They achieve stable structures by sharing their single, unpaired electron.

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Elements occur in a number of isotopic forms. In this problem, you will learn about the notation used to distinguish different isotopes.How many protons Z and how many neutrons N are there in a nucleus of the most common isotope of silicon, 28/14Si?

Answers

Answer:

  • There are 14 protons (Z) and 14 neutrons (N) in a nucleus of the most common isotope of silicton.

Explanation:

The notation of the most common isotope of silicon is:

  • ^(28)_(14)Si

The superscript, 28, to the left of the chemical symbol, Si, is the mass number, usually identified with the symbol A, and it is the sum of the protons and neutrons.

The subscript, 14, to the left of the chemical symbolr, Si, is the atomic number, Z, which is the number of protons.

Then, you have this equation:

  • mass number = number of protons + neutrons, or, in symbols:

  • A = Z + N

The number of protons is the same for any isotope of the same element. This is, all the isotopic forms of silicon have the same number of prtons: 14

The number of neutrons is determined from the equation A = Z + N, solving for N:

  • N = A - Z = 28 - 14 = 14.

Hence, the most common isotope of silicon has 14 protons and 14 neutrons.

How many joules are absorbed in a process that absorbs 0.5720 kcal?

Answers

Both joules and kilocalories are units of measurement for energy. This means that the solution to this problem can be solved just by converting the units using the appropriate conversion factors. One kilocalorie is equal to 4,184 joules. Multiply 0.5720 kcal by 4,184 to get the value in joules. This gives 2,393.25 joules.

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.

How many grams are in 2.3 x 10^-4 moles of Ca3(PO4)2

Answers

Molar mass 

Ca₃(PO₄)₂ = 310 g/mol

1 mole -------------------> 310 g
2.3x10⁻⁴ mole ---------> ?

m = 2.3x10⁻⁴ * 310 / 1

m = 0.0713 g 

hope this helps!

What needs to happen for a solute to dissolve in a particular solvent?

Answers

Answer: In order to a solute to dissolve in a solvent, both the attraction forces that bind the units of solute together and the intermolecular forces that bind the molecules of solvent together must be weaker than the attraction forces between the particles of solute and the molecules of solvent.


Explanation:


The solute particles in are binded together in virtue of attractive forces (the nature and strength of these forces depends on the particular solute).


The same happens with the solvent molecules: they are binded by attractive forces (similarly, the nature and strength of these forces depend on the particular solvent).


To get dissolved (form solution) the particles of solute must be separated and mixed with the solvent particles in a process called solvatation.


The solute particles must surrounded by the solvent particles.


When the forces of attraction between the solute particles and the solvent are stronger than the forces of attraction that bind the solute particles, the solute particles move away from the solid solute and are integrated into the solution.
the attractions between the solute and solvent molecules must be greater than the attractions keeping the solute together and the attractions keeping the solvent together.

Absolute zero is A. the temperature at which the motion of particles theoretically ceases. B. defined as 0°C. C. the triple point for water. D. all of the above

Answers

The correct answer is A. The temperature at which the motion of particles theoretically ceases.

Explanation:

The term "absolute zero" is used to refer to a temperature (degree of heat) in which particles have no movement or only minimal vibration as in this temperature the energy of particles is affected. Due to this, the absolute zero is one of the lowest temperatures that exists as it is equivalent to -273 °C or -459 °F, although it has been proved temperature can be even lower at certain circumstances. According to this, "absolute zero" is mainly defined by the lack of motion in particles and thus, the correct answer is "he temperature at which the motion of particles theoretically ceases".
Absolute zero is the temperature at which the motion of particles that constitute heat will be minimal. The answer is A. It is the lowest temperature that is theoretically possible. It is zero on the kelvin scale, but equivalent to -273.15°C. Hope i helped.
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