Determine the pH of 0.10 M NH3 solution. NH3 is a weak base with a Kb equal to 1.8x10-5 (round to the nearest whole number)

Answer:

(ΔHrxn)= 0.15kJ/mol

Explanation:

(ΔHrxn) = mc∆t

=0.00061×9.84×(50.5-25)

= 0.153kJ/mol

To calculate the enthalpy change for the combustion of titanium in a bomb calorimeter, first calculate the total heat absorbed by the calorimeter, then divide this by the moles of titanium combusted. The result is an approximate value of 19688.85 kJ per mole of Titanium combusted, indicating an exothermic reaction.

The subject here relates to thermochemistry, specifically calorimetry and the calculation of enthalpy change. First, we calculate the heat absorbed by a bomb calorimeter when the temperature increases, using the formula heat = heat capacity * delta_Temperature. Given in the question, heat capacity = 9.84 kJ/K and delta_Temperature = 50.50°C - 25.00°C = 25.5K. The heat absorbed by the calorimeter is therefore 9.84 kJ/K * 25.5K = 250.92 kJ.

This heat is equivalent to the heat released by the combustion of 0.610g of Titanium. To find the enthalpy change per mole of Titanium, we should first convert the mass of Titanium to moles using the atomic weight of Titanium (47.867 g/mol). 0.610g is about 0.01274 mol of Titanium. Finally, we find the enthalpy change per mole by dividing total heat by the number of moles, giving us 250.92 kJ / 0.01274 mol = 19688.85 kJ/mol.

This suggests that the process is highly exothermic, as when 1 mole of Titanium is combusted, it releases around 19688.85 kJ of energy.

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Answer:

D. Protons ; neutrons.

Explanation:

For a given element the number of protons is fixed, but the number of neutrons differ because the element usually consist of a number of isotopes.

For example Carbon has isotopes which contain 12, 13 and 14 neutrons.

So that is why you average the number of neutrons to find the approximate atomic mass..

Teardrop-shaped loops on modern roller coasters ensure a smoother ride by providing a gradual increase and decrease in centripetal acceleration, maintaining security in the rider's seat without the need for seat belts. The shape also prevents sudden jolts that would occur with a circular loop, enhancing overall ride comfort and safety.

The design of modern roller coasters often incorporates teardrop-shaped loops rather than circular ones to enhance the comfort and safety of the ride. The reason for this specific shape is that the radius of curvature gradually decreases as the coaster ascends the loop, reaching a minimum at the top. This reduces the jarring centripetal acceleration changes that would be experienced with circular loops, leading to a smoother ride.

This gradual increase in centripetal acceleration to a maximum at the top and then a decrease makes the experience more enjoyable by avoiding abrupt changes in forces. By having a smaller radius of curvature at the top, the acceleration can be easily maintained above the acceleration due to gravity, known symbolically as 'g.' This ensures that passengers remain securely in their seats throughout the loop without the need for additional restraints like seat belts.

Modern roller coaster engineering uses these principles, which have been known since the days of early railroad design, to create thrilling yet safe rides. By manipulating the forces and energy transitions in the coaster's path, engineers can predict exactly how the roller coaster will behave, keeping the ride both exciting and secure for all riders.

Answer:

0.3714 M

Explanation:

Step 1:

The balanced equation for the reaction. This is given below:

AgNO3 (aq) + NaCl (aq) -> AgCl(s) +

NaNO3 (aq)

Step 2:

Determination of the number of moles of AgNO3 in 30.00 mL of 0.2503 M AgNO3. This is illustrated below:

Molarity of AgNO3 = 0.2503 M

Volume of solution = 30mL = 30/1000 = 0.03L

Number of mole of AgNO3 =?

Molarity = mole /Volume

0.2503 = mole / 0.03

Cross multiply to express in linear form

Mole = 0.2503 x 0.03

Mole of AgNO3 = 7.509x10^-3 mole

Step 3:

Determination of the number of mole of NaCl required to react with AgNO3. This is illustrated below:

AgNO3 (aq) + NaCl (aq) -> AgCl(s) +

NaNO3 (aq)

From the balanced equation above,

1 mole of AgNO3 required 1 mole of NaCl for complete neutralization.

Therefore, 7.509x10^-3 mole of AgNO3 will also require 7.509x10^-3 mole of NaCl for complete neutralization.

Step 4:

Determination of the molarity of NaCl. This is illustrated below:

Mole of NaCl = 7.509x10^-3 mole

Volume of solution = 20.22 mL = 20.22/1000 = 0.02022L

Molarity =?

Molarity = mole /Volume

Molarity of NaCl = 7.509x10^-3/0.02022

Molarity of NaCl = 0.3714 M

Answer:

The concentration of NaCl in the solution is 0.371 M

Explanation:

Step 1: Data given

Volume of 0.2503 M AgNO3 solution = 30.00 mL = 0.030 L

Volume of NaCl = 20.22 mL = 0.02022 L

Step 2: The balanced equation

AgNO3(aq) + NaCl(aq) ===> AgCl(s)  + NaNO3(aq)

Step 3: Calculate concentration of NaCl

C1*V1 = C2*V2

⇒with C1 = the concentration of AgNO3 = 0.2503 M

⇒with V1= the volume of AgNO3 = 0.030 L

⇒with C2 = the concentration of NaCl = TO BE DETERMINED

⇒with V2 = the volume of NaCl = 0.02022 L

0.2503 M * 0.030 L = C2 * 0.02022L

C2 = (0.2503 * 0.030) / 0.02022

C2 = 0.371 M

The concentration of NaCl in the solution is 0.371 M

Answer:

392.20K

Explanation:

-We apply Charles' Law which states that for an ideal gas at constant pressure, its volume is directly proportional to it's temperature:

[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]

-Given that:

[tex]V_1=4.87L, V_2=6.08\\\\T_1=41.0\textdegree C=314.15\ K\\T_2[/tex]

#We substitute in the ratio formula above and calculate for [tex]T_2[/tex]:

[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}\\\\T_2=\frac{V_2T_1}{V_1}\\\\=\frac{6.08\ l\times 314.15\ K}{4.87\ L}\\\\\\=392.20\ K[/tex]

Hence, the temperature of the balloon at a volume of 6.08L is 392.20K

Answer:

cell membrane

ribosome

cytoplasm

Explanation:

Just believe in me

The structures that are common to both prokaryotic and eukaryotic cells are:

The main parts of all cells in both prokaryotes and eukaryotes are the cell or plasma membrane, and the compartment that it encloses, called the cytoplasm.

The cell membrane is characterized by being semi-permeable, dynamic and with the ability to be modified.

The cytoplasm fulfills three functions which are:

Ribosomes are responsible for intervening in protein biosynthesis in the cytoplasm.

Therefore, we can conclude that the structures that are common to both prokaryotic and eukaryotic cells are cell membrane, ribosome

and cytoplasm

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Answer:it may be made up of glass or porecelein ...material or material that should note react with the chemical

Explanation:

Answer:i have the answer is in the image :/      

Explanation:

Answer:

The purpose of the cell wall is to provide structure

Explanation:

Answer:

See explanation below

Explanation:

In this case, we can assume that the temperature is the same in both conditions. Let's assume that the temperature is 25 °C.

If the temperature is constant we can use the Boyle's law to calculate the volume. This law is:

P₁V₁ = P₂V₂

You should note that this expression is only valid when you have a constant temperature.

Solving for V₂:

V₂ = P₁V₁ / P₂

So all we have to do is replace the given values:

V₂ = 0.05 * 4x10⁶ / 1

V₂ = 200,000 L

Using the combined gas law and assuming temperature remains constant, the gas's volume after the explosion would be 200,000 liters.

This is a classic ideal gas law problem, which can be solved using the combined gas law formula that relates pressure, volume, and temperature. Since the temperature is not mentioned, we can assume it is constant, and so we use the equation that omits temperature which is P₁V₁ = P₂V₂. We can rearrange this to solve for V₂:

V₂ = (P₁ x V₁) / P₂

Plugging in the values we get:

V₂ = (4.0 x 10⁶ atm x 0.050 L) / 1.00 atm

V₂ = 200,000 L

The gas will have a volume of 200,000 liters after the explosion, assuming temperature remains constant and the gas behaves ideally.

Answer:A equal to

Explanation:

Final answer:

The mechanical energy lost by the golf ball is equal to the heat energy gained by the ball, grass, and air due to the law of conservation of energy.

Explanation:

The amount of mechanical energy lost by the golf ball is equal to the amount of heat energy gained by the ball, grass, and air molecules due to friction. According to the law of conservation of energy, energy cannot be created or destroyed, only transferred from one form to another. In this situation, the 12 joules of mechanical energy initially present in the golf ball is reduced to 4 joules after some time. The difference, which is 8 joules, is the amount of energy that has been transformed into heat due to the forces of friction acting on the ball by the grass and air.

Answer:

The answer to your question is the letter B.

Explanation:

Data

Single replacement reaction

Definition

A single replacement reaction consists most of the times of a metal that reacts with a compound and this metal replaces the cation of the compound.

The options show

A. A synthesis reaction

B. A single replacement reaction

C. A double replacement reaction

D. A double replacement reaction

Fe + CuSO4 → Cu + FeSO4, is an example of a Single-Replacement Reactions. In this reaction, the iron (Fe) displaces copper (Cu) from the copper sulfate (CuSO4), forming copper (Cu) and iron sulfate (FeSO4).

The question posed asks for an example of a single-replacement reaction.

These types of reactions, also known as substitution or single-displacement reactions, are characterized by an element being displaced from a compound by another element.

In this case, the answer option that fits this category is Fe + CuSO4 → Cu + FeSO4.

Here, the iron (Fe) displaces the copper (Cu) in the solute copper sulfate (CuSO4), thereby forming copper (Cu) and iron sulfate (FeSO4).

This example clearly represents the concept and characteristics of a single-replacement reaction.

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Answer:

Single Replacement

Explanation:

Edge 22

Answer:

yes

Explanation:

yes

Answer:

There are 6 non bonding pair of electrons present in Lewis structure of peroxide ion.

Explanation:

Ionic formula of peroxide ion is [tex]O_{2}^{2-}[/tex]

Total number of valence electron present in peroxide ion is 14 (12 electrons come from two oxygen atoms and another 2 electrons come from negative charges).

After fulfilling octet rule, Lewis structure of peroxide shows that each oxygen atom contains three non bonding electron pairs and a covalent bond.

Hence there are 6 non bonding pair of electrons present in Lewis structure of peroxide ion.

Lewis structure has been given below.

Answer:

The temperature remains constant because the internal energy only depends on temperature in that case

-Hops

Answer:

The answer to your question is Ionic

Explanation:

Data

Phosphorous and Lithium

type of bond = ?

Process

In chemistry there are 2 main bonds:

Ionic is a bond between a metal and a nonmetal but also we can identify these bonds if the difference of electronegativity is higher than 1.7.

Covalent is a bond between two nonmetals or when the difference of electronegativity is lower than 1.7.

For this molecule:

Lithium is metal and Phosphorous is a nonmetal so the bond is Ionic.

or

Electronegativity for Lithium = 0.98

Electronegativity for Phosphorous = 2.19

Difference of electronegativity = 1.21

                        As 1.21 > 1.7 the bond is Ionic.

Answer:

The chemical differences between acids and bases are: ionization and redox reaction.

Explanation:

Answer:

1.6 ×[tex]10^{-7}[/tex]M

Explanation:

[tex]K_{sp}[/tex] for calcium diphosphate is 8.64x10^(-13)

concentration of the calcium cations = 2.2955 x 10^−3M

[tex]Ca_{2}P_{2} O_{7}_(s)[/tex] ⇄[tex]2Ca_{2}_(aq)[/tex] + [tex]P_{2}O^{4-} _{7}_(aq)[/tex]

[tex]K_{sp}[/tex] = [tex][Ca^{2+}]^{2}[/tex]×[tex][P_{2} O^{4-}_7][/tex]

converting the concentration of the calcium cations from 9.2mg/dL to moles per liter , we get 2.2955 x [tex]10^{-3}[/tex]M

[tex][P_{2} O^{4-}_7][/tex] = [tex]\frac{K_{sp} }{[Ca^{2+}]^{2} }[/tex]

[tex][P_{2} O^{4-}_7][/tex] = [tex]\frac{8.64 . 10^{-13} }{[2.2955 . 10^{-3}]^{2} }[/tex]

     =1.6 ×[tex]10^{-7}[/tex]M

Answer:The four main factors that affect the rate of chemical reactions are temperature, concentration, surface area, and the presence of a catalyst. cause the particles (atoms or molecules) of the reactants to move more quickly so that they collide with each other more frequently and with more energy.

Explanation: lol sorry for putting 4 factors

Answer:

12 mol O2

Explanation:

This is assuming you're using a combustion equation of

2 H2S + 3O2 -> 2H2O + 2SO2

Next time include the equation because that is where you will find your mol to mol ratio

8 mol H2S x (3 mol O2 / 2 mol H2S) = 12 mol O2

Final answer:

To completely burn 8 moles of hydrogen sulfide, 12 moles of oxygen gas are required according to the stoichiometry of the balanced chemical equation.

Explanation:

The question is asking how many moles of oxygen gas (O₂) are required to completely burn 8 moles of hydrogen sulfide (H₂S). The balanced chemical equation for the reaction of hydrogen sulfide with oxygen is:

2 H₂S(g) + 3 O₂(g) → 2 SO₂(g) + 2 H₂O(g)

From the balanced equation, we see that 2 moles of H₂S react with 3 moles of O₂. To find out how many moles of O₂ are needed for 8 moles of H₂S, we can set up a proportion:

(3 moles O₂ / 2 moles H₂S) = (x moles O₂ / 8 moles H₂S)

Solving for x gives us:

x = (3 moles O₂ / 2 moles H₂S) × 8 moles H₂S

x = 12 moles O₂

Therefore, 12 moles of oxygen gas are required to completely burn 8 moles of hydrogen sulfide.

Answer:

this is the answer

Acetic acid CH3COH and Sodium Acetate CH₃CO₂Na both ionize in water. This leads to a shift of equilibrium to the left when sodium acetate is added to acetic acid. The concentrations can be computed.

The formula for acetic acid is CH3COH, and the formula for Sodium Acetate is CH₃CO₂Na. When Sodium Acetate CH₃CO₂Na is dissolved in water, it ionizes into Na+ and CH₃CO₂- ions. This process results in a basic solution as CH₃CO₂- is a weak base anion. By Le Chatelier's principle, when sodium acetate is added to a solution of acetic acid, the equilibrium shifts to the left, consuming some CH₃COO and H+ ions initially present in the solution.

The amount of acetic acid and sodium acetate in a solution can be calculated using the concentrations given. For instance, if 1.0 × 10-2 mol CH3COH is present and 0.01 × 10-2 mol is neutralized, there would be 0.99 × 10-2 mol CH3COH remaining. If the initially present acetate also gives a final concentration of 1.01 × 10-2 mol NaCH3CO₂, compute molar concentrations using the given volumes.

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Answer:

C

Explanation:

The chemical change between zinc chloride and magnesium sulfate will produce a precipitate.

Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.

There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

There are three types of chemical changes:

1) inorganic changes

2)organic changes

3) biochemical changes

During chemical changes atoms are rearranged and changes are accompanied by an energy change as new substances are formed.

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Answer:

A. They are equal.

B. The ratio of ions to molecules is 1 to 2.78× 10⁸.

Explanation:

A. Concentration of ions

In pure water, [H₃O⁺] = [OH⁻] = 1.00 × 10⁻⁷ mol·L⁻¹.

The concentration of hydroxide ions equals that of hydronium ions.  

B. Ratio of ions to molecules

Assume you have 1 L of pure water.

[tex]\text{Moles of water} = \text{1000 g} \times \dfrac{\text{1 mol}}{\text{18.02 g}} = \text{55.49 mol}[/tex]

You have 1.00× 10⁻⁷ mol·L⁻¹ [H₃O⁺] and 1.00× 10⁻⁷ mol·L⁻¹ [OH⁻], so you have 2,00 mol·L⁻¹ of ions.

The ratio of concentrations is  

[tex]\dfrac{\text{[Ions]}}{\text{[Molecules]}} = \dfrac{2.00 \times 10^{-7}}{55.49} = \dfrac{ 3.60 \times 10^{-5}}{1} = \mathbf{\dfrac{1}{2.78 \times 10^{8}}}[/tex]

Answer:carbon dioxide

Explanation:

Carbon dioxide has a higher density then most of the gases found in air

Answer:

Carbon dioxide, also known by the chemical formula CO2, has a higher density than the other gases found in air, which makes CO2 heavier than the air. Air is composed of approximately 78 percent nitrogen, 21 percent oxygen, and less than 1 percent of other gases.

Explanation

Carbon dioxide is an odorless, slightly toxic and colorless gas that possesses an acidic and pungent taste. CO2 is a vital but small component of air. CO2 is a vital aspect of life as we know it mainly because it is a vital component of the photosynthesis process required for plants to produce food.

The average concentration of CO2 in the atmosphere is about 404 ppm. It should also be noted that the CO2 content in the atmosphere tends to fall and rise in a regular pattern of 6 ppmv. Also, the CO2 concentration in the air has witnessed a steady increase for about 7 decades. As it stands, the current increase is 2.5ppm each year. The big question on the minds of many however is “Is carbon dioxide heavier than air?”

Carbon dioxide with the chemical formula of CO2 possesses a higher density of the gases found within the air. Air is made up of about 78% nitrogen which weighs about 32 gram per mole as well as 0.9 % argon which weighs about 39 g/mol. The carbon dioxide, on the other hand, has two oxygen atoms and a carbon atom. This is in addition to possessing a molecular weight of about 44 g/mol. It, therefore, suffices to say that carbon dioxide is heavier or of a higher density than air.

What Is The Ratio Of Carbon Dioxide To Air?

Carbon dioxide is about 1.5 times the weight of air which makes it heavier. Hence, if it gets released to the atmosphere it will lead to concentration at low elevations. Furthermore, CO2 will turn to ice at a temperature of -78.5 degrees Celsius. CO2 is generally available in high-pressure cylinder gasses or the form of dry ice. They are also used industrially to make rubber, fertilizers, and plastics.

Answer:

1.75M

Explanation:

Given parameters:

Initial volume of acid, HCl  = 450mL  = 0.45L

Initial concentration  = 3.5M

Final volume  = 0.9L

Unknown:

Final concentration  = ?

Solution:

This is a dilution problem in which a particular concentration is made from the stock of known concentration.

One important approach to solve this problem is to remember that the number of moles in the initial and final solution will always remain the same.

Since we know this;

       Number of moles  = molarity x volume;

let us find the number of moles of the initial solution;

      Number of moles  = 3.5 x 0.45  =  1.58moles

Now, to find the new molarity;

 Molarity  =  [tex]\frac{number of moles }{volume}[/tex]

    Input the parameters;

               Molarity = [tex]\frac{1.58}{0.9}[/tex]   = 1.75M

Explanation:

As the earth rotates from west to east. So the eastern hemisphere receives the sunlight faster than the western hemisphere and when as the earth rotates on its axis time also keeps on changing from Eastern to western hemisphere. As when there will be day in eastern hemisphere the western hemisphere will have night there. and as the earth rotates it affects the day . so in this way they are related.

I gave my own answers according to my view hope you like it and hope it helps you.

The mass of copper(II) bicarbonate (Cu(HCO3)2) produced in the chemical reaction, if the yield is 2.54 moles, is approximately 563.3 grams.

To find the mass of copper(II) bicarbonate, we need to use the molar mass of copper(II) bicarbonate, which can be found by adding the molar masses of each constituent atom. Copper(II) bicarbonate, Cu(HCO3)2, has a molar mass of 221.6 grams/mole.

Knowing we've produced 2.54 moles, we can multiply this by the molar mass:

2.54 moles * 221.6 grams/mole = 563.3 grams.

Therefore, the mass of copper(II) bicarbonate produced is approximately 563.3 grams. This calculation is based on the principle of stoichiometry, which deals with the quantifiable relationship of reactants and products in a chemical reaction.

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Answer:

C.

Explanation:

The heat island effect or the the urban heat island effect, is where the temperature of an area is higher than close rural areas. This is because materials suh and concrete and asphalt absorb the sunlight and store it, causing extreme weather.

The heat island effect, a phenomenon causing urban regions to be warmer than rural areas, can mainly influence local weather patterns. It does not directly affect ocean tides, crustal plate movements, or local volcanic activity.

The heat island effect is a phenomenon that causes urban regions to be significantly warmer than their surrounding rural areas. This is primarily due to human activities and the extensive use of concrete and asphalt, which absorb solar radiation and re-radiate it as heat. The phenomenon can mainly affect local weather patterns, particularly increasing temperature and altering precipitation.

Therefore, among the given choices, the heat island effect can influence the local weather patterns (Option C). The heat island effect has no direct influence on ocean tides, movement of crustal plates, or local volcanic activity. Those are controlled by other natural forces and processes such as the moon's gravitational pull for tides and tectonic activity for crustal movements and volcanic activity.

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Answer:

Aircraft cabins are therefore pressurized to maintained a similar pressure as that experienced at sea level to ensure normal breathing of passengers.

Explanation:

-Air becomes increasingly thinner with increasing altitudes.

-As such, oxygen becomes limited at higher altitudes and makes it difficult or almost impossible to breath  a condition called hypoxia.

-Aircraft cabins are therefore pressurized to maintained a similar pressure as that experienced at sea level to ensure normal breathing of passengers.