The end point in a titration of a 68 mL sample of aqueous HCI was reached by the addition of 42 mL of 0.82 M NaOH titrant. The reaction proceeds as follows. HCI (aq) + NaOH(aq) - NaCl(aq) + H2O(1) What is the molar concentration of HCI? • Report your answer with two significant figures.

Luster is how the surface of a mineral reflects light. It is not the same thing as color, so it crucial to distinguish luster from color. For example, a mineral described as “shiny yellow” is being described in terms of luster (“shiny”) and color (“yellow”), which are two different physical properties.

Answer:

It is definitly Luster

Explanation:

How shiny something is or how its acts in the sun

The iron filings react with copper sulfate, the copper is displaced and iron sulfate results.

The reaction between iron filings and copper sulfate is represented by the equation below:

\(Fe + CuSO_4--- > FeSO_4 + Cu\)

The iron filings displace the copper from copper sulfate to form iron sulfate.  Thus, elemental copper and iron sulfate are formed.

Iron is able to displace copper from copper sulfate because iron ranks higher than copper in the reactivity series.

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The naturally occurring the element x exists in three isotopic forms. The average atomic weight of x 28.544 amu.

Given that :

x- 28, Abundance % = 67.14 % = 0.6714

The atomic mass = 27.343 amu

x-29, Abundance % = 10.50 % = 0.1050

The atomic mass = 28.889 amu

x- 32, Abundance %  = 22.36 % = 0.2236

The atomic mass = 31.993 amu

The average atomic weight = ( 27.343 × 0.6714 ) + ( 28.889 × 0.1050) +

                                                          ( 31.993 × 0.2236)

                                                 = 18.358 + 3.0333 + 7.153

                                                 = 28.544 amu

Thus, the average atomic weight of naturally occurring element x exists in three isotopic forms 28.544 amu.

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Answer:

c

Explanation:

C is the answer for increasing Atomic number

The number of molecules in 9.0g of steam is 3.015 x 10²³.

Steam is a form of water. It is the vapor form of water.

Hydrogen has a molar mass of 1g but as it is H₂ there are 2 moles so : 2 x 1g = 2g

The molar mass of oxygen is 16 g.

Then the relative molecular mass of water equals 18 g

To determine how many moles of water are contained in 9 g, divide the mass (9 g) by the relative molecular mass (18 g) to obtain 0.5 moles.

1 mole = 6.03 x 10²³ particles (in this case molecules)Avogadro's number

So, 0.5 *(6.03 x 10²³)= 3.015 x 10²³ molecules

9 grams of steam contains 3.015 x 10²³ H₂O molecules.

Thus, the number of molecules in 9.0 g of steam is 3.015 x 10²³ water molecules.

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Answer:

its B

Explanation:

a p e x

Answer:

the answer is b. allows electricity to flow easily

Answer:

Explanation:

The distance covered by an object given it's velocity and time taken can be found by using the formula

From the question

velocity = 290 miles/hour

time = 3 hours

The distance between the two cities is

distance = 290 × 3

We have the final answer as

Hope this helps you

Greenhouse gases are the gases that trap heat in the atmosphere of the earth. Methane is the greenhouse gas that contributes most to the greenhouse effect.

The greenhouse effect is the process due to the greenhouse gas that entraps the heat and sun rays from the sun that increases the temperature of the atmosphere.

The methane gas is found as 180th million in 1 percent and lives around 25 years in the atmosphere also has 25 more strength than carbon dioxide. Methane is found as natural gas and is a potent greenhouse gas.

Therefore, methane contributes most to the greenhouse effect.

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Answer:

The theory for metallic bonding explains conductivity by stating that metals have delocalized electrons that are free to move throughout the metal lattice. When an electric field is applied to a metal, these delocalized electrons move in response to the field, creating an electric current. Since these electrons are not bound to a particular atom, they are free to move throughout the metal, which allows for the high electrical conductivity that is characteristic of metals.

Answer:

The answer to this question would be electron.

Electron is located on the outer side of the atom and constantly moving in an orbit so its location cannot be accurately determined. The cloud around the center of the atom is drawn to picture the orbit.

Neutron and proton located in the middle of an atom in a part that called nucleus. Nucleus location is kept at the center and it doesn't move.

Explanation:

Therefore, the pH and the equilibrium concentration of S²⁻ in a 6.89x10⁻² M hydrosulfuric acid solution are pH = 7.78 and [S²⁻] = 2.31x10⁻¹¹ M.

Hydrosulfuric acid (H₂S) is a weak acid that dissociates in water to produce hydrogen ions (H⁺) and bisulfide ions (HS⁻). H₂S(aq) + H₂O(l) ⇌ H₃O⁺(aq) + HS⁻(aq)

The bisulfide ions (HS⁻) in turn reacts with water to produce hydronium ions (H₃O⁺) and sulfide ions (S²⁻).

HS⁻(aq) + H₂O(l) ⇌ H₃O⁺(aq) + S²⁻(aq) Ka1

= 1.0x10⁻⁷,

Ka2 = 1.0x10⁻¹⁹

To calculate the pH and the equilibrium concentration of S²⁻ in a 6.89x10⁻² M H₂S(aq) solution, we must first determine if H₂S(aq) is a strong or weak acid.

It has Ka1 = 1.0x10⁻⁷, which is a very small value; thus, we can conclude that H₂S(aq) is a weak acid.

To calculate the equilibrium concentration of S²⁻ in a 6.89x10⁻² M H₂S(aq) solution, we need to use the Ka2 value (Ka2 = 1.0x10⁻¹⁹) and a chemical equilibrium table.

[H₂S] = 6.89x10⁻² M[H₃O⁺] [HS⁻] [S²⁻]

Initial 0 0 0Change -x +x +x

Equilibrium (6.89x10⁻² - x) x xKa2 = [H₃O⁺][S²⁻]/[HS⁻]1.0x10⁻¹⁹

= x² / (6.89x10⁻² - x)

Simplifying: 1.0x10⁻¹⁹ = x² / (6.89x10⁻²)

Thus: x = √[(1.0x10⁻¹⁹)(6.89x10⁻²)]

x = 2.31x10⁻¹¹ M

Thus, [S²⁻] = 2.31x10⁻¹¹ M

To calculate the pH of the solution, we can use the Ka1 value and the following chemical equilibrium table.

[H₂S] = 6.89x10⁻² M[H₃O⁺] [HS⁻] [S²⁻]

Initial 0 0 0

Change -x +x +x

Equilibrium (6.89x10⁻² - x) x x

Ka1 = [H₃O⁺][HS⁻]/[H₂S]1.0x10⁻⁷

= x(6.89x10⁻² - x) / (6.89x10⁻²)

Simplifying: 1.0x10⁻⁷ = x(6.89x10⁻² - x) / (6.89x10⁻²)

Thus: x = 1.66x10⁻⁸ M[H₃O⁺]

= 1.66x10⁻⁸ M

Then, pH = -log[H₃O⁺]

= -log(1.66x10⁻⁸)

= 7.78 (rounded to two decimal places)

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The correct answer is: mol \(l^-2\)

The solubility product (Ksp) is a constant that describes the equilibrium of a sparingly soluble or insoluble salt in water, and it is expressed as the product of the concentrations of the ions raised to their stoichiometric coefficients.

The units of solubility product depend on the specific reaction being described.

Generally, for a salt AB that dissociates into A+ and B-, the units of Ksp are (mol/L)^2, since Ksp = [A+][B-].

Therefore, the correct answer is: mol \(l^-2\)

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Answer:

He put segregationists in charge of federal agencies...

Explanation:

...

Answer:

He placed segregationists in charge of federal agencies.

Explanation:

Electrοns are lοst frοm the 6s subshell when elemental mercury fοrms a catiοn with a charge οf +2.

An electrοn is a negatively charged subatοmic particle that can be either bοund tο an atοm οr free (nοt bοund). An electrοn that is bοund tο an atοm is οne οf the three primary types οf particles within the atοm -- the οther twο are prοtοns and neutrοns. Tοgether, prοtοns and electrοns fοrm an atοm's nucleus.

When elemental mercury (Hg) fοrms a catiοn with a charge οf +2, it lοses twο electrοns.

The electrοn cοnfiguratiοn οf mercury (Hg) is [Xe] \(4f^{14} 5d^{10} 6s^2\).

Tο fοrm a catiοn with a +2 charge, mercury lοses twο electrοns frοm its highest energy level, which is the 6s subshell.

Therefοre, electrοns are lοst frοm the 6s subshell when elemental mercury fοrms a catiοn with a charge οf +2.

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Use the mole-to-mole conversion factor (B/A) to convert the mass of A first into moles, then back into grams of A using the mole quantity of B.

A chemical compound is a substance that contains atoms from many chemical elements bonded together by chemical bonds. It is made up of numerous similar molecules. Therefore, a molecule made up of only one type of atom is not a compound.

Examples of compounds are table salt (NaCl), which is generated from the elements sodium and chloride, and water (H2O), which is created from the components hydrogen and oxygen.

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Answer: Exosphere

Explanation:

Answer:

exosphere

Explanation:

the outermost layer of earth's atmosphere is called exosphere

Answer:

false i am pretty sure because dead flowers.

Beans are processed through 'nibbing'. During the nibbing process, the roasted cocoa beans are crushed and ground into a paste called cocoa mass or cocoa liquor.

This cocoa mass can then be further processed to separate the cocoa solids from the cocoa butter, which is the fat component of the cocoa bean. The separated cocoa solids and cocoa butter are used in the production of chocolate. Pure cocoa mass (cocoa paste) in solid or semi-solid form is known as chocolate liquor. It includes about equal amounts of cocoa butter and solid cocoa, much like the cocoa beans (nibs) from which it is made. It is made from fermented, dried, roasted, and separated from their skins cocoa beans. To make cocoa mass (cocoa paste), the beans are pulverised.

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Answer:  I just try this  

Answer:

f the figure is a square with a perimeter of 16 inches, then each side of the square is 4 inchest in length. Area is found by multiplying the length x the width. For a square, the length and width are the same. A = 16 sq

Explanation:

Answer:

Yes it does change

Explanation:

Thermometer 2 had ethanol as the thermometric liquid because the change in volume with an increase in temperature was smaller compared to Thermometer 1 containing 1-propanol due to stronger intermolecular forces in ethanol.

The change in volume of a liquid with an increase in temperature is characterized by its coefficient of thermal expansion, which is different for different liquids.

Ethanol has a coefficient of thermal expansion of about 1.2 x 10⁻³ K⁻¹, while 1-propanol has a coefficient of thermal expansion of about 1.5 x 1010⁻³ K⁻¹. This means that 1-propanol has a higher change in volume with an increase in temperature compared to ethanol. Therefore, 1-propanol has the highest change in volume with an increase in temperature between the two liquids.

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Answer:

Giant structures

Explanation:

An ionic compound is a giant structure of ions. The ions have a regular, repeating arrangement called an ionic lattice . The lattice is formed because the ions attract each other and form a regular pattern with oppositely charged ions next to each other.