Consider the following reaction: 2HCl + Ca(OH)2 CaCl2 + 2H2O A scientist wants to neutralize 25 mL of 0.001 M Ca(OH)2 with a volume of 0.005 M HCl. What is the minimum volume of HCl required?

Answers

Answer 1
Answer: The balanced chemical equation for the above reaction is as follows ;
Ca(OH)2 + 2HCl —> CaCl2 + 2H2O
Stoichiometry of Ca(OH)2 to HCl is 1:2
Number of Ca(OH)2 moles present - 0.001 mol/L / 1000 mL/L x 25 mL
Number of Ca(OH)2 moles = 2.5 x 10^(-5) mol
Number of HCl moles needed for neutralisation = 2.5 x 10^(-5) mol x2 = 5 x 10 ^(-5) mol
The molarity of HCl solution is 0.005 M
The solution contains 0.005 mol in 1000 mL
Therefore volume of 5x10^(-5) mol in = 1000/0.005 x 5 x 10^(-5) mol = 10 mL
10 mL of HCl is needed for neutralisation

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For a cell whose potential is -0.46 v with 3 moles of electrons exchanged, what is DG?DG = -nFE°cell

a.) -133 kJ
b.) +133 kJ
c.) +133,170 kJ
d.) -6.65 x 10^-3

Answers

ΔG = -nEF

ΔG = Gibbs free energy change
n = moles of electrones participated in
E = Electrode potential
F = Faraday constant

By substituting,
ΔG = -(3 mol) x 96485 A S/ mol x (-0.46) V
      = + 133149.3 J
      = + 133 kJ

Hence the answer is "b".

Since ΔG is a positive value, the reaction is non spontaneous reaction.

1. How the Bible came to be?2. Why it must be regarded as Sacred?
3. Why it should be respected?

Answers

Answer: 1. How the Bible came to be?

The Book of scriptures could be a collection of sacrosanct books composed by antiquated prophets and students of history over a period of more than 4,000 a long time. The Book of scriptures is isolated into two primary parts: the Ancient Confirmation, which contains 39 books, and the Modern Confirmation, which contains 27 books. The Ancient Confirmation was composed fundamentally in Hebrew, with a few parcels in Aramaic, whereas the Unused Confirmation was composed in Greek. The books of the Book of scriptures were composed by distinctive creators, counting prophets, rulers, clerics, and witnesses, who were motivated by God to record His message to humankind.

2. Why it must be respected as Sacred?

The Book of scriptures is respected as sacrosanct since it is considered to be the word of God. The Book of scriptures instructs that God never stops adoring His children, and it uncovers God's character and gives His disclosure of Himself to His individuals. The Book of scriptures is God's composed disclosure to humankind, and when initially composed, it was without blunder and speaks with God's specialist. The Book of scriptures could be a source of shrewdness, instructing, condemnation, rectification, and preparing in nobility. The Book of scriptures has had a extraordinary impact on afterward lawful frameworks in numerous parts of the world.

3. Why it should be respected?

The Book of scriptures ought to be regarded since it is God's Word to humanity. The Book of scriptures educates around Jesus and the Ten Commandments, which require us to adore God and treat others with regard. The Book of scriptures may be a source of shrewdness, instructing, condemnation, rectification, and preparing in righteousness. The Book of scriptures is the establishment for the religious philosophy of work and tells the story of God's work of creation, the primary work of all and the model for all work that take after. The Book of scriptures ought to be drawn closer in a appropriate way, and it ought to be treated with love and regard as the composed Word of God to humankind.

Explanation:

Which of the following can be used to neutralize an ammonia (NH3) solution?

Answers

It really depends on your options. 
Since NH3 solution is a weak base, the option that neutralizes a base is an acid. So find an acid among your options, and here are some examples: HNO3, HCl, etc.
It would have been much better if you had attached some options to choose. But I think I've got what you mean. I bet that solution is HCl.

When you accidentally overfill a water glass, the water takes on a dome-like or convex shape, but a half-filled water glass takes on a concave shape, in which the water is higher at the sides of the glass. This is because:Within the glass, adhesive forces dominate, and on top of the glass, cohesive forces dominate.

Within the glass, water tries to maximize its surface area, and on top of the glass, water tries to minimize its surface area.

Water's surface tension is greater inside the glass than on top of the glass.

Adhesive forces between water and the glass get weaker with height.

Answers

Answer: The correct answer is within the glass, adhesive forces dominate, and on top of the glass, cohesive forces dominate.

Explanation:

Adhesive forces are defined as the molecular forces which are present between different substances. For Example: When water is poured into glass, the molecular forces between the walls of container and water molecules.

Cohesive forces are defined as the molecular forces which are present between same substances.

When water is put in the glass, two types of meniscus form, one is concave meniscus and another is convex meniscus.

Concave meniscus is formed due to adhesive forces and is dominating inside the glass.

Convex meniscus is formed due to cohesive forces and is dominating on the top of glass. As, on the top of glass no walls of glass are present. So, water molecules stick together to other water molecules.

Hence, the correct answer is within the glass, adhesive forces dominate, and on top of the glass, cohesive forces dominate.

The water is higher at the sides of the glass. This is because within the glass, adhesive forces dominate, and on top of the glass, cohesive forces dominate.

How is electron movement related to covalent bonding in ammonia, NH3?A) Electrostatic sharing in a sea of electrons around the atoms allows bonds to form.
B) The atomic orbitals overlap and electrons are shared between the atoms forming bonds.
C) A transfer of electrons forms ions which are electrostatically attracted forming bonds.
D) Orbital exchange occurs between the atoms to redistribute the electrons and form bonds.

Answers

Answer:

B

Explanation:

A) The sea of electrons only happen with metalic bond, a bond with two metalic elements.

B) As both elements in ammonia (N and H) are non-metals we don't observe an transfer of electrons, both elements share the number of electrons needed to stablize it (3 electrons for the N and 1 for the H).

C) To have a transfer of electrons, we need a bond between a metal and a non-metal, in this case, N and H are non-metals, so this doesn't happen.

D) The electrons are shared, only the electrons nothing happens between the orbitals.

How is electron movement related to covalent bonding in ammonia, NH3?

A) Electrostatic sharing in a sea of electrons around the atoms allows bonds to form. 
B) The atomic orbitals overlap and electrons are shared between the atoms forming bonds. 
C) A transfer of electrons forms ions which are electrostatically attracted forming bonds. 
D) Orbital exchange occurs between the atoms to redistribute the electrons and form bonds.

The electron movement related to covalent bonding in ammonia, NH3 is The atomic orbitals overlap and electrons are shared between the atoms forming bonds. The answer is letter B.

How is skepticism important to the progress of science in this scenario?

Answers

being a sceptic is important because it keeps you searching for answers