Which of the following solvents will best dissolve wax, which is a complex mixture of compounds that mostly are CH3−CH2−CH2−CH2−CH2—? Structural formulas for molecules (a) (a) Hexane (a) Hexane is a six-carbon zigzag chain, with the terminal carbons single bonded to three Hs and all other Cs to two Hs. Structural formulas for molecules (b) (b) Benzene (b) Benzene is a six-membered ring with carbon as all of its vertices and alternating single and double bonds as the sides. Each carbon is also single bond-ed to H. Structural formulas for molecules (c) (c) Acetone (c) Acetone is a central C double bonded above to O and single bonded right and left, angled down, to CH3. Structural formulas for molecules (d) (d) Carbon tetrachloride (d) Carbon tetrachloride is a central C single bonded to four Cls. Structural formulas for molecules (e) (e) Water

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:

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.

By space travel.

Or aeroplanes.

Whichever one is in your choices

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. It released 13,160 joules.

Explanation:

The amount of heat released from hot water = the amount of heat absorbed by cold water.

∵ 13,160 joules of heat energy were absorbed by the cold water.

∴ The hot water release 13,160 joules.

So, the right choice is: B. It released 13,160 joules.  

Answer: Option (B) is the correct answer.

Explanation:

Two bodies of different temperature when come in contact with each other then heat is transferred from hot body to cold body until a thermal equilibrium is maintained between them.

So, when a sample of hot and cold water are mixed together then energy will be released by hot water which is actually absorbed by the cold water till temperature of both the liquids become equal.

Hence, when hot water has 13,160 joules of energy then this energy will be absorbed by a sample cold water. This means that hot water has released 13,160 joules of energy.

Hence, we can conclude that the true statement about the hot water in the calorimeter is that it released 13,160 joules.

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:

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:

A. an exothermic reaction

Explanation:

an exothermic reaction releases energy in the form of heat, therefore making the beaker warm.

Answer: A. an exothermic reaction

Explanation:

A. Exothermic reactions are defined as the reactions in which energy of the product is lesser than the energy of the reactants. The total energy is released in the form of heat. The temperature of the vessel rises.

B. Decomposition is a type of chemical reaction in which one reactant gives two or more than two products.

Example: [tex]Li_2CO_3\rightarrow Li_2O+CO_2[/tex]

C. Single displacement reaction is a chemical reaction in which more reactive element displaces the less reactive element from its salt solution.

Example: [tex]Zn+2HCl\rightarrow ZnCl_2+H_2[/tex]

D. Endothermic reactions are defined as the reactions in which energy of the product is greater than the energy of the reactants. The total energy is absorbed in the form of heat.The temperature of the vessel drops.

Answer: It's a civil engineer

Explanation:

An engineer that designs buildings is a(n) A) civil engineer

Civil engineering is an engineering discipline that deals with the design and development of infrastructure like buildings, roads, bridges, and railways.

Civil engineers not only design and develop new infrastructure, but they also play an important role in rebuilding projects in instances like natural disaster

Civil engineering deals in building houses, buildings, roads, bridges, and dams. So, the civil engineers are trained to handle all sorts of projects; simple to complex houses.

Architect: A person whose profession is designing and drawing plans for buildings, bridges and houses, as well as many other structures.

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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:

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 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.

endothermic  

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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:

1. Sodium hydrogen  - Base

2. Barium hydroxide solution  - Acid

3. Carbonate solution - Base

Explanation:

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Answer:

C. an endothermic reaction

Explanation:

an endothermic reaction absorbs heat energy from its surroundings

Answer:

Away from the central sulfur atom.

Explanation:

Answer:

away from central sulfer atom

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:

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

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:

Electrostatic Van de Waals forces act between molecules to form weak bonds. The types of Van der Waals forces, strongest to weakest, are dipole-dipole forces, dipole-induced dipole forces and the London dispersion forces. The hydrogen bond is based on a type of dipole-dipole force that is especially powerful. These forces help determine the physical characteristics of materials.

Van der Waals forces are weak intermolecular forces caused by temporary dipoles due to electron density fluctuations, playing a crucial role in the structure of proteins and the behavior of non-ideal gases.

Van der Waals forces are residual forces that hold molecules together. Unlike strong covalent or ionic bonds, these intermolecular forces are relatively weak and are caused by slight fluctuations in electron densities within molecules. These fluctuations lead to temporary dipoles, allowing molecules to attract each other when they are in very close proximity. Van der Waals forces include attractions between permanent dipoles, induced dipoles, and instantaneous dipoles.

These weak attractions are essential for the three-dimensional structure of proteins in our cells, contributing to their proper function alongside covalent, ionic, and hydrogen bonds. The van der Waals force is likened to Velcro®, where individual interactions are weak, but collectively they can have a significant effect. This is an important concept when considering the behavior of real gases versus the ideal gas model, where van der Waals forces are not accounted for.

In a gas, as two molecules approach each other, their electron densities interact, causing temporary dipoles and resultant attractions between the molecules. These interactions are termed van der Waals forces and are critical for understanding the properties of gases and many biological molecules.

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:

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:

It's an oxygen atom

Explanation:

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:

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.

Answer: Between the alveoli and a network of tiny blood vessels called capillaries, which are located in the walls of the alveoli.

Gas exchange in the lungs occurs in the alveoli. Oxygen diffuses from the alveoli into the blood, while carbon dioxide diffuses from the blood into the alveoli.

Gas exchange in the lungs, also referred to as pulmonary gas exchange, primarily occurs in the alveoli. The alveoli are tiny, grape-like clusters surrounded by networks of thin-walled pulmonary capillaries.

Here is a step-by-step explanation of the gas exchange process:

The vast number of alveoli (around 300 million per lung) provides a large surface area, maximizing the efficiency of gas exchange.

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.