Why does a heating curve have horizontal plateaus at certain points during the heating process? What is happening at those points?

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Answer 1

Answer: The reason is because of the direction the plateaus is, so this affects it in the degree of the end result

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ovalent bonds are formed by which of the following? A. The energy transfer from one body to another B. The bonding of cations and anions C. Weak electrostatic attraction between charged areas of adjacent molecules D. The electrostatic attraction between oppositely charged ions E. The sharing of electrons between atoms
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.

Please help me i need help

Answers

USA test prep science intern assessment? :P
I believe its A.

The answer is A.mitochondria
It has a double membrane, the inner layer being folded inward to form layers

The balanced equation below represents a molecule of bromine separating into two bromine atoms.Br2-->Br + Br
What occurs during this change?
(1) Energy is absorbed and a bond is formed.
(2) Energy is absorbed and a bond is broken.
(3) Energy is released and a bond is formed.
(4) Energy is released and a bond is broken.

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(4) Energy is released and a bond is broken. This happens because when the bromine molecule splits, the energy that was holding the two atoms together is released.

Answer is: (2) Energy is absorbed and a bond is broken.

This energy is called bond-dissociation energy.

Bond-dissociation energy is the measure of bond strength in a chemical bond.

Bond energy of bromine molecule (sigma bond) is energy needed for breaking up one molecule of bromine into two bromine atoms.

When two bromine atoms (Br) form molecule of bromine (Br₂), than energy is released and bond is formed.

In which sample is the average kinetic energy of the particles greatest?(1) 10. mL of HCl(aq) at 25°C
(2) 15 mL of HCl(aq) at 20.°C
(3) 10. mL of H2O(l) at 35°C
(4) 15 mL of H2O(l) at 30.°C

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Answer: The correct answer is option 3.

Explanation: Average kinetic energy is defined as the energy of motion of the particles of a system. It is a measure of Kelvin Temperature.

Mathematically,

$K=(3)/(2)(R)/(N_A)T$

where,

K = kinetic energy of the molecules measured in joules.

R = Gas constant = $8.314Jmol^(-1)K^(-1)$

$N_A$ = Avogadro's number = $6.022* 10^(23)atoms/mol$

T = Temperature in kelvins.

Kinetic energy is directly proportional to the temperature of the system.

$\text{Kinetic energy}\propto \text{Temperature}$

More the temperature, more will be the kinetic energy of the molecules.

Hence, the correct answer is Option 3.

The question asks about the average kinetic energy, so it is related only to temperature. Then the answer is (3) with the highest temperature.

In the reaction Mg (s) + 2HCl (aq) H2 (g) + MgCl2 (aq), how many grams of hydrogen gas will be produced from 125.0 milliliters of a 6.0 M HCl in an excess of Mg?

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The balanced reaction is:

Mg (s) + 2HCl (aq) = H2 (g) + MgCl2 (aq)

We are given the amount of reactants to be reacted. This will be the starting point of the calculations.

.125 L HCl solution (6.0 mol HCl / L solution) ( 1 mol H2 / 2 mol HCl ) ( 2.02 g H2 / 1 mol H2 ) = 0.76 g H2

Which of the following solutions contains the greatest number of ions?. . 1) 200.0 mL of 0.10 M iron (III) chloride. 2) 800.mL of 0.10 M sucrose

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The number of ions is determined by multiplying the given volume and the molarity of the solution. The product is multiplied to the number of ions when the solution dissociates. In this case:

1. 200.0 mL of 0.10 M iron (III) chloride = 0.2*0.1* 4 = 0.08
2. 800.mL of 0.10 M sucrose = 0.8 * 0.1 * 1 = 0.08

The two solutions have the same number of ions.

An ionic bond would most likely form between atoms of which of these pairs?A. oxygen and oxygen
B. magnesium and oxygen
C. magnesium and magnesium

Answers

Magnesium and oxygen would form an ionic bond because magnesium is a metal and oxygen is a nonmetal, and metals and nonmetals usually form ionic bonds.

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Magnesium chloride is a salt formed with ionic bonds between one magnesium ion and two chloride ions. Magnesium has two electrons in its outer shell and chlorine has seven electrons in its outer shell. How are the electrons transferred between these atoms?

What is the nuclear equation for the alpha decay of 173 Yb?