CHEMISTRY COLLEGE

What will an object moving at a constant velocity do?come to a stop, unless it is pushed by another force
A.increase in speed
B.maintain a constant velocity until acted on by another force
C.come to a stop on its own

Answers

Answer 1
Answer:

Answer:B

Explanation: an object in motion will stay in motion until acted on by another force and an object in rest will stay in test until acted on by another force

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The concentration of a certain sodium hydroxide solution was determined by using the solution to titrate a sample of potassium hydrogen phthalate (abbreviated as KHP). KHP is an acid with one acidic hydrogen and a molar mass of 204.22 g/mol. In the titration, 24.46 mL of the sodium hydroxide solution was required to react with 0.1082 g KHP. Calculate the molarity of the sodium hydroxide.

Answers

Answer:

Molarity_(NaOH)=0.02166\ M

Explanation:

Moles of KHP :

Given, Mass of KHP = 0.1082 g

Molar mass of KHP = 204.22 g/mol

The formula for the calculation of moles is shown below:

moles = (Mass\ taken)/(Molar\ mass)

Thus,

Moles= (0.1082\ g)/(204.22\ g/mol)

Moles= 5.2982* 10^(-4)\ mol

According to the reaction shown below:

KHP + NaOH ⇒ KNaP + H₂O

1 mole of KHP reacts with 1 mole of NaOH

So,

5.2982* 10^(-4)\ mol of KHP reacts with 5.2982* 10^(-4)\ mol of NaOH

Moles of NaOH = 5.2982* 10^(-4)\ mol

Volume = 24.46 mL = 0.02446 L ( 1 mL = 0.001 L)

Molarity=(Moles\ of\ solute)/(Volume\ of\ the\ solution)

Molarity_(NaOH)=(5.2982* 10^(-4))/(0.02446)

Molarity_(NaOH)=0.02166\ M

Consider the dissolution of AB(s):AB(s)⇌A+(aq)+B−(aq)Le Châtelier's principle tells us that an increase in either [A+] or [B−] will shift this equilibrium to the left, reducing the solubility of AB. In other words, AB is more soluble in pure water than in a solution that already contains A+ or B− ions. This is an example of the common-ion effect.The generic metal hydroxide M(OH)2 has Ksp = 1.05×10−18. (NOTE: In this particular problem, because of the magnitude of the Ksp and the stoichiometry of the compound, the contribution of OH− from water can be ignored. However, this may not always be the case.)What is the solubility of M(OH)2 in pure water?

Answers

Answer:

S = 6.40 × 10⁻⁷ M

Explanation:

In order to calculate the solubility (S) of M(OH)₂ in pure water we will use an ICE Chart. We recognize 3 stages: Initial, Change and Equilibrium, and we complete each row with the concentration or change in concentration.

            M(OH)₂(s) ⇄ M²⁺(aq) + 2 OH⁻(aq)

I                                   0                  0

C                                 +S               +2S

E                                   S                 2S

The solubility product (Kps) is:

Kps = 1.05 × 10⁻¹⁸ = [M²⁺].[OH⁻]²=S.(2S)²

1.05 × 10⁻¹⁸ = 4S³

S = 6.40 × 10⁻⁷ M

What are the components of DNA? A. ribose sugar, cytosine, guanine, adenine, thymine, and phosphate group

B. ribose sugar, cytosine, guanine, adenine, uracil, and phosphate group

C. deoxyribose sugar, cytosine, guanine, adenine, thymine, and phosphate group

D. deoxyribose sugar, cytosine, guanine, adenine, uracil, and phosphate group

Answers

Answer:

C

Explanation:

A-T G-C

What is the pH of a 0.45 M solution of hydrochloride acid (H

Answers

Answer:

0.35

Explanation:

pH = -log[H+]

[H+] = [HCl} = 0.45 M because HCl is a strong acid, and dissociate completely.

pH = - log[0.45] = 0.35

The standard free energy change for a reaction in an electrolytic cell is always:_________ a. Positive
b. Negative
c. Zero
d. Impossible to determine

Answers

Answer: The standard free energy change for a reaction in an electrolytic cell is always positive.

Explanation:

Electrolytic cells use electric currents to drive a non-spontaneous reaction forward.

Relation of standard free energy change and emf of cell

\Delta G^o=-nFE^0_(cell)

where,

\Delta G^o = standard free energy change

  n= no of electrons gained or lost

F= faraday's constant

E^0_(cell) = standard emf

E^0_(cell)   = standard emf = -ve  , for non spontaneous reaction

Thus  \Delta G^o=(-ve)(-ve)=+ve

Thus standard free energy change for a reaction in an electrolytic cell is always positive.

Why is it important to keep your apparatus dry what reaction will occur between the grignard reagent and water?

Answers

Grignard reagents react with water to create Alkanes. It is important to keep the apparatus dry because grignard reagents react with water
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