What elements fill the d orbitals on the periodic table?

Answers

Answer 1

Answer: The elements that fill the d orbitals on the periodic table are called transition metals.

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List down the types of intermolecular forces that exist between molecules (or basic units) in the species given below: (a) benzene (C6H6), (b) CH3Cl, (c) PF3, (d) NaCl, (e) CS2

Answers

(a) benzene (C6H6) - nonpolar molecules . Only dispersion forces are present.

(b) CH3Cl - Chloroform ; polar molecules. Both dispersion and dipole-dipole forces are present.

(c) PF3 - Phosphorus triflouride ; has polar bonds but has nonpolar molecule due to its symmetrical structure. Only dispersion forces are present.

(d) NaCl - Sodium chloride ; ionic compound. Both ion-ion and dispersion forces are present.

(e) CS2 - Carbon disulfide ; nonpolar molecules. Only dispersion forces are present.

True or false: Denaturation of an enzyme increases the rate at which it may catalyze a chemical reaction.

Answers

The answer is False. Hope this helps.

Which list of the phases of H2O is arranged in order of increasing entropy?(1) ice, steam, and liquid water
(2) ice, liquid water, and steam
(3) steam, liquid water, and ice
(4) steam, ice, and liquid water

Answers

The answer is (2). The entropy is measured the disorder degree. So the increasing of entropy of the phases are solid, liquid and gas. So the answer is ice, liquid water and steam.

A gas is heated from 298 K to 367 K while its volume changes from 2.5 L to 3.9 L. If the initial pressure of the gas is 1.1 atm, what is the final pressure of the gas?

Answers

PV=nRT, .85atm
If the volume goes up, the pressure goes down.

Answer:

0.87

Explanation:

When two intermediate chemical equations are combined, the same substance that appears in the same phase can be canceled out, provided thatA) it is a reactant in one intermediate reaction and a catalyst in the other reaction.
B) it is a product in one intermediate reaction and a catalyst in the other reaction.
C) it is a reactant in one intermediate reaction and a product in the other reaction.
D) it is a reactant in both of the intermediate reactions.

Answers

Answer: Option (C) is the correct option.

Explanation:

When two intermediate chemical equations are combined, the same substance that appears in the same phase can be canceled out, provided that it is a reactant in one intermediate reaction and a product in the other reaction.

For example,

$2Al(s) + 2KOH(aq) + 6H_(2)O\rightarrow 2KAl(OH)_(4)(aq)+ 3H_(2)(g)$ ....(1)

$2KAl(OH)_(4)(aq) + 4H_(2)SO_(4)(aq) + 6H_(2)O(l)\rightarrow 2KAl(SO_(4))_(2)(aq)+ 12H_(2)O(s)$ .........(2)

Cancelling the common species in both the equations as follows.

$2Al(s) + 2KOH(aq) + 6H_(2)O\rightarrow \not{2KAl(OH)_(4)(aq)}+ 3H_(2)(g)$

$\not{2KAl(OH)_(4)(aq)}+ 4H_(2)SO_(4)(aq) + 6H_(2)O(l)\rightarrow 2KAl(SO_(4))_(2)(aq)+ 12H_(2)O(s)$

Therefore, on addition we get the equation as follows.

$2Al(s)+ 2KOH(aq) + 4H_(2)SO_(4)(aq) + 22H_(2)O(l)\rightarrow 3H_(2)(g)+ 2KAl(SO_(4))_(2) + 12H_(2)O(s)$

The right answer for the question that is being asked and shown above is that: "C) it is a reactant in one intermediate reaction and a product in the other reaction." When two intermediate chemical equations are combined, the same substance that appears in the same phase can be canceled out, provided that it is a reactant in one intermediate reaction and a product in the other reaction.

The amount of heat transferred from an object depends on all of the following exceptA. the specific heat of the object.
B. the change in temperature the object undergoes.
C. the initial amount of Calories in the object.
D. the mass of the object.

Answers

The amount of heat transferred from an object depends on all of the following except the initial amount of Calories in the object. The answer is letter C. The equation to be used to calculate the heat release when solid melts is the enthalpy of melting. It is represented as H = mCpT where H is the heat released after phase change, m is the mass of the substance, Cp is the specific heat capacity of the substance and T is the change in temperature.

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