Given that Kw for water is 2.4× 10–14 at 37 °C, compute the pH of a neutral aqueous solution at 37 °C, which is the normal human body temperature.

Answer:

1.75 mol of Cu

Explanation:

all you have to do is divide 3.50 by 2 because you need half moles from Ag

Answer: 1.75 mol of copper

Explanation: in the given balanced equation for the reaction of copper and silver nitrate, we can see that with one mol of copper, we can form two moles of silver (Ag), so we can calculate how many moles of copper we need to form 3.50 moles of Ag as follows:

3.50 moles of Ag *1 mol of copper/2 moles of Ag=

3.50mol of copper/2=

1.75 mol of copper

Answer:

False

Explanation:

The force of gravity is not only determined by the mass of the two objects but also the distance.

The law of universal gravitation states the product of the masses is directly proportional to the gravitational force, but it is also indirectly proportional to the square of the distance between them.

In other words, the greater the masses of each the greater the gravitational force, but the greater the distance between the two, the weaker the gravitational force.

Answer:

A

Explanation:

The carbon atoms in saturated hydrocarbons are linked with single covalent bonds to their neighbors. The chains of saturated hydrocarbon are therefore well compact with hydrogen bonds between one another. This is why most saturated hydrocarbons are solid at room temperature. Unsaturated hydrocarbons have kinks in their chains that interrupt hydrogen bonds between chains. These kinks are because some carbon atoms in the chains have double or tripple covalent bonds.

Answer:

It's an oxygen atom

Explanation:

Answer:

Explanation:

1) Data:

a) M = ?

b) % mass = 18.2%

c) Solute: CaCl₂

d) d = 1.18 g/ml

2) Formulae:

a) Molarity

M = n/V, where M is molarity, n is number of moles of solute, and V is the volumen of solution in liters.

b) Density

d = m/V, where d is the density of the solution, m is the mass in grams, V is the volume in liters.

c) Number of moles

n = mass in grams / molar mass, where n is the number of moles.

d) % mass

% = (mass of solute / mass of solution) × 100

3) Solution:

a) Start by assuming a base amount: 100 g of solution.

b) Calcualte the volume (V) of the solution:

                            V = 100 g / 1.18 g/ml = 84.75 ml

                            V = 0.08475 liter

c) Calculate the mass of solute:

        ⇒ mass of solute = % × mass of solution / 100 = 18.2 × 100 g / 100

            mass of soiute = 18.2 g

d) Calculate the number of moles of solute (n)

e) Calculate the molarity (M) of the solution

The answer is reported with 3 significant figures, since the data have 3 significant figures.

Answer:

The Molarity of the aqueous solution that is 18.2% by mass calcium chloride is 1.94 moles/liter.

Key points:

                      = (mass of solute/mass of the solution)×100%.

Step by Step Explanation:

Step 1: Calculate the mass of the solute.

Percentage of solute by mass is 18.2%.

Assuming the mass of the solution to be 100g, then;

percentage by mass =  (mass of solute/mass of the solution)×100%.

                  = 18.2 % = (x/100) × 100

                  = 0.182 = x/100

                         x = 18.2 g

Thus, mass of solute = 18.2 g

Step 2: Calculating the volume of the solution.

Density of the solution is 1.18 g/ml

But, density = mass/volume

Thus, Volume = mass/density

Mass of the solution is 100 g

Therefore;

Volume = 100 g/ 1.18 g/ml

             = 84.75 mL or 0.08475 L

Step 3: Calculating the number of moles of the solute, Calcium chloride,

Number of moles = mass of solute/ molecular mass of solute

Mass of solute = 18.2 g

Molecular mass of Calcium chloride is 110.98 g/mol

Thus;

Number of moles = 18.2 g/110.98 g/mol

                             = 0.164 mole

Step 4: Calculating the molarity of the solution;

Molarity = number of moles/ volume in L

       number of moles = 0.164 mole

       Volume in L = 0.08475 L

Therefore;

Molarity = 0.164 mole/0.08475 L

              = 1.94 moles/L or 1.94 M

Answer:

Inspiration

Explanation:

This question is on application of Boyle's law; pressure is inversely proportional to volume.when we inhale air, the diaphragm and the muscles in the ribs contract thus increasing the volume in the lungs.Increased volume of the lungs cause the pressure to decrease.During exhaling, the diaphragm and muscles in the ribs relax, making the lungs to recoil and reduce in volume to force air out.Pressure in the lungs is increased than that in the environment making air to move out.

Answer: end of expiration when lung volume is the lowest

Explanation: Expiration is the opposite of inspiration

Answer:

1,1-, (Z)-1,2-, and (E)-1,2-dibromoethene

Explanation:

Their structures are shown below.

The 1,2-dibromoethenes (2 and 3) are positional isomers

of 1,1-dibromoethene (1).

(Z)-1,2-dibromoethene (2) and (E)-1,2-dibromoethene (3) are stereoisomers (geometric isomers) of each other.

By space travel.

Or aeroplanes.

Whichever one is in your choices

endothermic  

I hope this helped :)

Answer : The given reaction is an example of endothermic reaction.

Explanation :

Endothermic reaction : It is a type of chemical reaction in which the energy is absorbed by the surroundings. In this reaction, the energy of reactants are less than the energy of products.  In this reaction, the energy is given to the system.

Exothermic reaction : It is a type of chemical reaction in which the energy is released into the surroundings. In this reaction, the energy of reactants are more than the energy of products. In this reaction, the energy is released from the system.

The given balanced chemical reaction is,

[tex]2CO_2(g)+4H_2O(l)+1452KJ\rightarrow 2CH_3OH(l)+3O_2(g)[/tex]

In this reaction, the 1452 KJ energy is given to the system. So, the given reaction is an example of endothermic reaction.

Answer:

Away from the central sulfur atom.

Explanation:

Answer:

away from central sulfer atom

Answer:

Moist and warm temperatures

Explanation:

Temperature and rainfall are the two main factors that speed up chemical reactions and weathering in rocks and soils. Higher temperatures increase the rate of reactions while more rainfall means more water for chemical weathering, resulting in a higher weathering rate.

The two factors that speed up rates of chemical reaction and weathering in rocks and soils are the temperature and the amount of rainfall. A higher temperature increases the rate of chemical reactions, with the rate potentially doubling for every 10°C increase. This is because higher temperatures enhance the thermal agitation of atoms and molecules, leading to more frequent collisions and reactions. In addition, increased rainfall provides more water, an essential medium for chemical weathering reactions. More rainfall leads to more chemical reactions with the particles in soils, increasing the weathering rate.

Mechanical weathering also plays a role by breaking down rocks into smaller pieces, thus increasing the surface area available for chemical weathering. Together, mechanical and chemical weathering contribute to the deterioration of rocks and the formation of soil, which is crucial for ecosystems. The combination of climate factors, such as high temperature and heavy rainfall, typically results in nutrient-poor soils unsuitable for agriculture but rich in iron and aluminum oxides.

Answer:

Keq = [C]^c[D]^d/[A]ᵃ[B]ᵇ

Explanation:

Keq = [C]^c[D]^d/[A]ᵃ[B]ᵇ

Considering the definition of Kc, the equilibrium constant of aA + bB ⇄ cC + cD is

[tex]Kc=\frac{[C]^{c} [D]^{d} }{[A]^{a} [B]^{b} }[/tex]

Equilibrium is a state of a reactant system in which no changes are observed as time passes, despite the fact that the substances present continue to react with each other. In other words, reactants become products and products become reactants and they do so at the same rate.

In other words, chemical equilibrium is established when there are two opposite reactions that take place simultaneously at the same speed.

The concentration of reactants and products at equilibrium is related by the equilibrium constant Kc. Its value in a chemical reaction depends on the temperature.

Considering the expression of a generic reaction aA + bB ⇄ cC + cD, the value of Kc is

[tex]Kc=\frac{[C]^{c} [D]^{d} }{[A]^{a} [B]^{b} }[/tex]

That is, the constant Kc is equal to the multiplication of the concentrations of the products raised to their stoichiometric coefficients by the multiplication of the concentrations of the reactants also raised to their stoichiometric coefficients.

In summary, the equilibrium constant of aA + bB ⇄ cC + cD is

[tex]Kc=\frac{[C]^{c} [D]^{d} }{[A]^{a} [B]^{b} }[/tex]

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Answer:

C. an endothermic reaction

Explanation:

an endothermic reaction absorbs heat energy from its surroundings

The value of the missing equilibrium constant is [tex]6.9\times 10^{-10}[/tex].

Given:

The equilibrium constant of the reaction:

[tex]H_2(g) + Br_2(g) \rightleftharpoons 2 HBr(g) ,K_c = 3.8\times 10^4[/tex]...(i)

The other reaction:

[tex]4HBr(g)\rightleftharpoons 2H_2(g) + 2Br_2(g)[/tex]....(ii)

To find:

The equilibrium constant of the other reaction:

[tex]4HBr(g)\rightleftharpoons 2H_2(g) + 2Br_2(g)[/tex]

Solution:

[tex]H_2(g) + Br_2(g) \rightleftharpoons 2 HBr(g) ,K_c = 3.8\times 10^4...(i)[/tex]

The expression of the equilibrium constant of the reaction (i):

[tex]K_c=\frac{[HBr]^2}{[H_2][Br_2]}...[1]\\\\3.8\times 10^4=\frac{[HBr]^2}{[H_2][Br_2]}[/tex]

The other chemical reaction :

[tex]4HBr(g)\rightleftharpoons 2H_2(g) + 2Br_2(g)...(ii)[/tex]

The expression of the equilibrium constant of the reaction (ii):

[tex]K_c'=\frac{[H_2]^2[Br_2]^2}{[HBr]^4}\\\\K_c'=(\frac{[H_2]^1[Br_2]^1}{[HBr]^2})^2[/tex]

Using [1]:

[tex]K_c'=(\frac{1}{K_c})^2\\\\K_c'=(\frac{1}{ 3.8\times 10^4})^2\\\\=6.9\times 10^{-10}[/tex]

The value of the missing equilibrium constant is [tex]6.9\times 10^{-10}[/tex].

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Answer:

Polluted ground water.

Explanation:

The rocks through which water flows into the ground sieves most of the contaminants whose molecules are larger than most bacteria. Such molecules include but are not limited oil molecules. Therefore as it descends to the lower levels of the soil profile, water is subjected to continuous filtration by the layers and it is the least susceptible to contamination by oil spills.

Answer: Increased global temperature

Explanation:

There is no direct effect of oil spillage on climate or global unless the spillage does not caught fire.

Only in this case, huge amount of carbon dioxide will be released which affect the climate locally else oil spillage has no effect on the global temperature.

Death of aquatic animals, polluted ground water, decreased soil productivity are some of the consequences that can be seen in case of oil spillage.

Answer:

2Ca₃(PO₄)₂ + 10C + 6SiO₂ → 6CaSiO₃ + P₄ + 10CO.

Explanation:

2Ca₃(PO₄)₂ + 10C + 6SiO₂ → 6CaSiO₃ + P₄ + 10CO.

that 2 mol of Ca₃(PO₄)₂ react with 10 mol of C and  6 mol of SiO₂ to produce 6 mol of CaSiO₃, 1 mol of P₄ and 10 mol of CO.

Answer:

First one is (10) , second one is (6) , and third one is (10).

Explanation: 10 , 6 , 10 is the correct order!

Answer:

1. Sodium hydrogen  - Base

2. Barium hydroxide solution  - Acid

3. Carbonate solution - Base

Explanation:

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Wax will be dissolved by nonpolar solvents: (a) hexane, (b) benzene and (d) carbon tetrachloride

Wax will not be dissolved by polar solvent such as (c)  acetone and (e) water

Explanation:

Molar mass of C2H6= 2×12+6=30

30 g of C2H6 gives 1 mol of C2H6

10.0 g of C2H6 gives 1/30 ×10= 1/3 mol of C2H6

1 mol of C2H6 has 2 mol of Carbon

1/3 mol of C2H6 has 1/3 ×2 = 2/3 Molly of Carbon.

No. of atoms = 2/3× 6.023×10^23

=4.01×10^23

To determine the number of carbon atoms in 10.0 g of C2H6, calculate the number of moles from the mass and molar mass, and then multiply by Avogadro's number and the number of carbon atoms per molecule of ethane. This results in approximately 4.015 × 1023 carbon atoms.

To find out how many carbon atoms are in 10.0g of C2H6, we first need to calculate the molar mass of ethane (C2H6). The molar mass is the sum of the masses of all the atoms in a molecule. Carbon has a molar mass of approximately 12 g/mol, and hydrogen has a molar mass of about 1 g/mol. Therefore, the molar mass of C2H6 is (2 × 12 g/mol) + (6 × 1 g/mol) = 30 g/mol.

Next, we calculate how many moles of C2H6 are in 10.0 g of the substance using the molar mass:

Number of moles of C2H6 = mass ÷ molar mass = 10.0 g ÷ 30 g/mol

This gives us approximately 0.333 moles of C2H6. Since each molecule of ethane contains 2 carbon atoms, we can find the total number of carbon atoms:

Total number of carbon atoms = number of moles of C2H6 × Avogadro's number × number of carbon atoms per molecule = 0.333 moles × 6.022 × 1023 atoms/mol × 2

Finally, this calculation will give us the total number of carbon atoms in 10.0 g of C2H6, which is approximately 4.015 × 1023 carbon atoms.

Answer:

b. Si has valence electrons in the n= 3 energy level.

d. Xe has valence electrons in the n=5 energy level

Explanation:

A silicon atom has 14 electrons and 14 protons in its structure. Therefore it has a simple electron configuration of 2.8.4

It therefore has 3 energy levels. The outermost 4 electrons are the valence electrons.

A xenon has an electron configuration of 2.8.18.18.8 = 5 energy levels. The outermost 8 electrons are the valence electrons.

Answer:

The Ring of Fire is also called the Circum-Pacific Belt and refers to a path along the Pacific Ocean which is characterized by frequent earthquakes and active volcanoes.

Explanation:

The Ring of Fire is also called the Circum-Pacific Belt and refers to a path along the Pacific Ocean which is characterized by frequent earthquakes and active volcanoes.

The majority of Earth’s earthquakes and volcanoes usually occur along the Ring of Fire.

Answer:

It is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge distributed over the entire ion.

Explanation:

The formula of phosphate ion is PO₄³⁻

The formula shows a phosphorus atom surrounded by 4 oxygen atoms.

For this bond to be established, phosphorus would be covalenty bonded to the oxygen atoms.

A covalent bond arises when two atoms with similar zero or very small electronegativity difference(≤ 0.5 ) combines. The electronegativity difference between phosphorus and oxygen is less than 0.5 and the two atom would bond by sharing of their electrons.

The net charge on the resulting radical is a -3 charge which it uses to form other bond types with other atoms. The charge implies an excess of 3 electrons on the radical formed.

The correct statement describing the phosphate ion is: It is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge distributed over the entire ion.

The phosphate ion is composed of phosphorus and oxygen atoms with a distributed charge, breaking the octet rule in chemistry. Phosphorus can break the 'octet rule' due to d orbitals availability, and the charge on phosphate ions is evenly spread over oxygen atoms.

Answer:

Before adding the spatula tip amount: saturated solution.

After adding the spatula tip amount: super saturated solution.

Explanation:

Before adding the spatula tip amount: the solution is saturated.

After adding the spatula tip amount: the solution is super saturated.

Explanation:

When small amount of solute is added to a solvent and if it readily dissolves then this type of solution is known as an unsaturated solution.

For example, in the given situation when calcium chloride is first dissolved in water then it completely dissolves and this makes the solution unsaturated.

And, a saturated solution is defined as a solution which contains maximum amount of solute.

So, when a spatula tip full of calcium chloride is added into water then it is unable to dissolve the solute. This means the solution has become saturated.

Thus, we can conclude that solution before adding the spatula tip amount is unsaturated and after adding the spatula tip amount the solution becomes saturated.

These are four questions and four answers.

Answers:

1) activation energy of the reverse reaction

     b. Decreased

2) Rate of the forward reaction

    a. Increased

3) Rate of the reverse reaction

    a. Increased

4) Activation energy of the forward reaction

    b. decreased

Explanation:

Activarion energy is the energy required by the reactants to form the intermediate transition state and become products.

Catalysts are substances that change the path of the chemical reactions, lowering the activation energy, and thus speeding up the rate of the reactions, since the products can reach the new lower activation energy faster.

The equilibrium reactions are the chemical process in which two reactions, the forward and the reverese reactions, occur simultaneously and at the same rate.  The equlibrium reactions may be represented by:

Where A → B is the direct or forward reaction, and A ← B is the reverse reaction (note the inversed arrow, from right to left).

For the direct reaction A represents the reactants and B represents the products. On the other hand, B represents the reactants and A represents the reactants of the reverse reaction and A. This, is A is the reactant of the forward reaction and the product of the reverse reaction, while B is the reactant of the reverse reaction and the product of the forward reaction.

Since, the addition of a catalyst lowers the activation energy of the process, the new activation energy is lower for both the forward and the reverse reaction, meaning that:

1. The activation energy of the reverse reaction is decreased (option b. of the first question)

2. The rate of the forward reaction is increased (option a. of the second question)

3. The rate of the reverse reaction is increased (option a. of the third question).

4. Activation energy of the forward reaction is decreased (option b. of the fourth question).

In summary, the addition of a catalyst decreases the activation energy for both forward and reverse reactions, and increases the rate of both forward and reverse reactions.

The following aspects of a reaction affected by the addition of a catalyst are

The following aspects of a reaction affected by the addition of a catalyst (it is  a substance that enables a chemical reaction to proceed at a usually faster rate or under different conditions (as at a lower temperature) than otherwise possible) are

1) activation energy of the reverse reaction: b. Decreased

Energy of activation is the energy that must be provided to a chemical or nuclear system with potential reactants to result in: a chemical reaction, nuclear reaction, or other physical phenomena.

2) Rate of the forward reaction: a. Increased

Forward reaction is the reaction that products are produced from reactants and it goes from left to right in a reversible reaction.

3) Rate of the reverse reaction: a. Increased

A reversible reaction is a reaction in which the reactants form products react together to give the reactants back.

4) Activation energy of the forward reaction: b. decreased

The activation energy for the forward reaction is the free energy amount that must be added to go from the energy level of the reactants to the energy level of the transition state

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Answer:

Silver

Explanation:

because it is a trasition metal and are good condutors

Among nitrogen, neon, sulfur, and silver, silver is the best conductor of electricity at STP because it's a metal and carries free electrons that allow electrical flow.

At Standard Temperature and Pressure (STP), the best conductor of electricity among the options provided (nitrogen, neon, sulfur, and silver) is silver. This is because electrical conductivity is a property of metals and silver is a metal, while nitrogen, neon, and sulfur are non-metals. Metals have 'free electrons' that move around and allow the flow of electricity, and among many metals, silver is known for its high electrical conductivity.

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Answer:

2- (last choice) when it forms an ion.

Answer:A pseudo-noble gas configuration is: 1s2 2s2 2p6 3s2 3p6 3d10. Cu^+ has this electron configuration.  The answer is C)

Explanation:

[tex]\bold{Cu^+}[/tex] ions have a "pseudo-noble-gas" electron configuration.

The ion with the [tex](n-1) d^{10}[/tex] electron configuration is known as Nobel gas. The nature of noble gas is that the cations in this electron configuration are stable.

The Pseudo-noble gas has the electron configuration as:

[tex]1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10}[/tex]

Since, [tex]Cu^+[/tex] ion has the same configuration. The example of Nobel gas is, both [tex]InCl[/tex] and [tex]InCl_3[/tex] are stable compounds. To form [tex]In^+[/tex] only the [tex]5p^1[/tex] electron is removed leaving the [tex][Kr] 5s^2 4d^{10}[/tex] electronic configuration.