Write condensed and bond-line structural formulas for all of the constitutional isomers Practice problem 4.1 with the molecular formula C7H16. (There are a total of nine constitutional isomers.)

Answer:

0.102 M

Explanation:

Given data

Step 1: Calculate the moles of solute

The molar mass of sucrose is 342.3 g/mol. The moles corresponding to 35.0 g of sucrose are:

[tex]35.0g \times \frac{1mol}{342.3g} =0.102mol[/tex]

Step 2: Calculate the molarity of sucrose in the solution

The molarity is equal to the moles of solute divided by the liters of solution.

[tex]M=\frac{0.102mol}{1.000L} =0.102 M[/tex]

Answer:

1) 5.0 cm² ( to two significant figures or one decimal place)

2) 1.0 (to two significant figures or to one decimal place)

3) 4.5 cm ( to  two significant figures or one decimal place)

4) 0.1 cm ( to  two significant figures or one decimal place)

5) The remaining answers due to incorrect rounding are 4.994 cm², 0.0 cm, 4.47 cm, 0.07 cm, 1, 1.03 cm, 4.99 cm²

Explanation:

The answers given are rounded to  two significant figures or one decimal places:

1) 2.27*2.2 =  5.0 cm² ( to one decimal place)

2) 2.27/2.2=  1.0 ( to one decimal place)

3)  2.27+2.2  = 4.5 cm ( to one decimal place)

4) 2.27-2.2  =  0.1 cm ( to one decimal place)

5) The remaining answers due to incorrect rounding are 4.994 cm², 0.0 cm, 4.47 cm, 0.07 cm, 1, 1.03 cm, 4.99 cm²

Answer:

Kr, mass number 81, number protons 36.

Explanation:

If the atom has 36 electrons, and it is neutral, it has 36 protons. 36 protons means that this element has atomic number = 36. This is Kr.

Mass number = number protons + number neutrons = 36 + 45 = 81

1. The symbol of the element is Kr

2. The mass number of the element is 81

3. The proton number of the element is 36

The answer to the question given above, is shown below:

Since the isotope is neutral, it means the atomic number (i.e the proton) and the number of electron are equal.

The isotope has 36 electrons. Therefore, the atomic number is also 36.

Element having atomic number of 36 from the periodic table is Krypton with the symbol of Kr.

Neutron = 45

Atomic number = 36

Mass number = atomic number + Neutron

Mass number = 36 + 45

The atomic number of an element is simply the proton. Thus,

Atomic number = 36

1. The symbol of the element is Kr

2. The mass number of the element is 81

3. The proton number of the element is 36

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Answer:

Sodium hydroxide

Out of the two substances, sodium hydroxide would you use to unclog the pipes.

Sodium hydroxide is used to produce soaps, rayon, paper, products that explode, dyes, and petroleum products.

The presence of sodium hydroxide in a cleanser or in a homemade aqueous solution converts these pesky fats into soaps and the soap is then easily removed by water.

Hence, out of the two substances, sodium hydroxide would you use to unclog the pipes.

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Answer:

Arranged in order of most soluble to least soluble in water:

[tex]KCl > CH_{4} > C_{4} H_{9} OH > C_{3}H_{8}[/tex]

Explanation:

Water is a polar solvent due to the electric charge it possesses. Hence it would only dissolve polar molecules.

Non-polar molecules would be dissolved by non-polar solvents.

Short chain alcohols are more soluble than butanol, but generally the polar -OH group is soluble in water.

ANSWER: From experience and observation, the pathogen that responds more faster to treatments are PARASITES.

This is because, our body are already used to parasite, as they feed and mostly live inside our body. Parasites becomes harmful to our body, when it is allowed to be much in the body, thereby weakening the immune system of the body. Intake of vaccination reduces the number of parasites in the body, which gives the immune system the chance of recovering and protecting the body.

Parasite does not replicate more faster like viruses and other pathogens. These makes it more easier for treatment to work more faster. They are also easily killed by taking the proper treatment, and the rate of their replications are very slow when compared to the rate of their death when vaccinated.

Some example disease caused by parasites are:

1) Giardiasis

2) Trichomoniasis

3) Malaria

4) Toxoplasmosis

5) Intestinal worms

6) Pubic lice

All this disease above responds very fast to medical treatment, unless when they is complications, which are mostly when the parasite has been allowed to cause more harm and replicate much in the body, without any treatment. This is why doctors advice patients that lives at the tropical regions to periodically vaccinate themselves on parasitic infections.

Answer:

10

Explanation:

The 5 will multiply the subscript 2 on the K atoms making it 10

Answer:

pH change is -0.07

Explanation:

Using H-H equation for acetic acid:

pH = pKa + log [Acetate salt] / [Acetic acid]

Replacing:

pH = 4.74 + log[1.188M] / [1.188M]

pH = 4.74

The HCl reacts with sodium acetate producing acetic acid, thus:

HCl + CH₃COONa → CH₃COOH + NaCl

That means the final moles of sodium acetate are initial moles - moles of HCl and moles of acetic acid are initial moles + moles of HCl.

As the volume of the buffer is 1.0L, initial moles of both substances are 1.188moles. After reaction, the moles are:

sodium acetate: 1.188mol - 0.1mol = 1.088mol

Acetic acid: 1.188mol + 0.1mol = 1.288mol

Using again H-H equation:

pH = 4.74 + log[1.088M] / [1.288M]

pH = 4.67

pH change is: 4.67 - 4.74 = -0.07

Answer: The equilibrium constant for the reaction is 0.000016.

Explanation:

Equilibrium constant is defined as the ratio of concentration of products to the concentration of reactants each raised to the power their stoichiometric coefficients.

The given balanced equilibrium reaction is,

                            [tex]2NOCl(g)\rightleftharpoons 2NO(g)+Cl_2(g)[/tex]

The expression for equilibrium constant for this reaction will be,

[tex]K_c=\frac{[NO]^2[Cl_2]}{[NOCl]^2}[/tex]

Now put all the given values in this expression, we get :

[tex]K_c=\frac{(1.2\times 10^{-3})^2\times (2.2\times 10^{-3})}{(1.4\times 10^{-2})^2}[/tex]

[tex]K_c=0.000016[/tex]

Thus the equilibrium constant for the reaction is 0.000016.

Answer:

The appropriate answer to the question in the discussion would be "negligible".

Explanation:

So that the above is the right answer.

Answer:

Greater than

Explanation:

Just took it on edge

Answer:

  a) More gas is added

  b) Temperature is increased

  f) The container's size is decreased

Explanation:

For an ideal gas, pressure is jointly proportional to temperature and the quantity of gas, and inversely proportional to the volume. Then pressure will increase for ...

  a) More gas is added

  b) Temperature is increased

  f) The container's size is decreased

Answer:

Explanation:

A buffer is  solution which resists change in pH upon addition of either acids or bases.

The pH of a buffer is calculated by the ratio of the concentration  of base to concentration of acid. The weak acid and conjugate base have a Ka similar to the pH desired.

Statements that are correctly describe a buffer are buffer is generally made up of a weak acid and its conjugate base, pH and Ka of a buffer solution does not change significantly.

Buffer solution is a mixture of a weak acid and its conjugate base or weak base with its conjugate acid.

Buffer solutions resists the value of pH of the solution whenever small quantity of strong acid or strong base is added on it. pH of the buffer solution will be calculated by using the Henderson Hasselbalch equation as follow:

For weak acids-

pH = pka + log [conjugate base]/[weak acid]

For weak base-

pH = pka + log [conjugate acid]/[weak base]

Ka is the acid dissociation constant which is not changes too much for the buffer solution.

Hence options (C), (D) and (E) are correct.

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Answer:the answer is DI

Explanation:APΣX

Answer:

0.533 M KOH

Explanation:

                        2 KOH(aq) + H2SO4(aq) → K2SO4(aq) + 2 H20 (l}

from reaction   2 mol            1 mol

                           x                  15*10^(-3)*0.425 mol        

15.00 mL = 15*10^(-3)L H2SO4 solution

15*10^(-3)L*0.425 mol/L = 15*10^(-3)*0.425 mol H2SO4

x =2*15*10^(-3)*0.425/1 = 2*15*10^(-3)*0.425 mol KOH

23.9mL = 23.9 *10^(-3) L KOH

M(KOH)  - molarity  KOH

M(KOH)*V(KOH solution) = M(KOH)*23.9 *10^(-3) L KOH - is moles KOH

2*15*10^(-3)*0.425 mol H2SO4 = M(KOH)*23.9 *10^(-3) L KOH

M(KOH) = 2*15*10^(-3)*0.425 /(23.9 *10^(-3)) = 0.533 M

Answer:

(PH color chart at the bottom)

Chop the cabbage into small pieces until you have about 2 cups of chopped cabbage. Place the cabbage in a large beaker or other glass container and add boiling water to cover the cabbage. Allow at least 10 minutes for the color to leach out of the cabbage. Alternatively, you can place about 2 cups of cabbage in a blender, cover it with boiling water, and blend it.

Filter out the plant material to obtain a red-purple-bluish colored liquid. This liquid is at about pH 7. The exact color you get depends on the pH of the water.

Pour about 50–100 mL of your red cabbage indicator into each 250 mL beaker.

Add various household solutions to your indicator until it changes color. Use separate containers for each household solution—you don't want to mix chemicals that don't go well together.

2=Red

4=Purple

6=Violet

8=Blue

10=Blue Green

12 = Green Yellow

Answer:

(C.) γ radiation

Explanation:

Gamma radiation, γ , does not consist of particles but a photon of energy. Hence, it has no mass or charge, allowing it to travel much faster than alpha or beta particles.

From the options, only γ-raiation does not have charge as opposed to positrons and protons which are + and beta which is either + or -.

Answer:

Lead

Explanation:

Lead (Pb) has atomic number 82

Ex Polonium (Po) has atomic number 84 and mass number 212

Answer:

lead

Explanation:

kkknskndcnndcks

a

Answer:

Explanation:

The correct answer is C. The water is the solvent because the green pellets dissolved in it.

Explanation:

In solutions, the are two substances involved, the solvent and the solute. The solvent is usually a liquid substance; additionally, the solvent dissolves another substance, which is known as the solute. For example, if you dissolve a spoon of salt in a glass of water, the solute is the salt which is the substance dissolved and the solvent is the water because the solute is dissolved in it. According to this, in the case presented the water is the solvent because the green pellets which are the solute dissolve in it.

Answer:

a. 2.53 mL

Explanation:

Hello,

In this case, by knowing the density is defined as the ratio of the mass to the volume:

[tex]\rho =\frac{m}{V}[/tex]

Since both the mass and density of benzene are given, we can easily compute the volume by solving for it:

[tex]V=\frac{m}{\rho}=\frac{2.00g}{0.790g/mL}\\ \\V=2.53mL[/tex]

Therefore the answer is a. 2.53 mL .

Best regards.

Answer:

a. 2.53 mL

Explanation:

The density is an intensive property, that is, it does not depend on the system size or the amount of material in the system. At a given temperature, the density of a liquid is constant, so it can be used to identify a substance.

The density (ρ) results from the quotient between the mass (m) of the liquid and its volume (V). We can use this expression to find the volume corresponding to 2.00 grams of benzene (ρ = 0.790 g/mL).

ρ = m / V

V = m / ρ

V = 2.00 g / (0.790 g/mL)

V = 2.53 mL

Answer:

I think it is...

The lightning helps produce oxidized forms of nitrogen, such as nitrate.

In an ecosystem, the lightning helps produce oxidized forms of nitrogen such as nitrate which nourishes the soil.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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The answer would be blue litmus red

Answer:

[tex]m_{PbI_2}=18.2gKI[/tex]

Explanation:

Hello,

In this case, the undergoing chemical reaction is:

[tex]2KI+Pb(NO_3)_2\rightarrow 2KNO_3+PbI_2[/tex]

Thus, we proceed to compute the reacting moles of Pb(NO3)2 and KI, by using the given concentrations and densities and molar masses which are 331.2 g/mol and 166 g/mol respectively:

[tex]n_{Pb(NO_3)_2}=96.7mL*\frac{1.134g}{mL}*\frac{0.14gPb(NO_3)_2}{1g}*\frac{1molPb(NO_3)_2}{331.2gPb(NO_3)_2} =0.0464molPb(NO_3)_2\\\\n_{KI}=99.8mL*\frac{1.093g}{mL}*\frac{0.12gKI}{1g}*\frac{1molKI}{166gKI} =0.0789molKI[/tex]

Next, the 0.0464 moles of Pb(NO3)2 will consume the following moles of KI (consider their 1:2 molar ratio):

[tex]n_{KI}^{consumed\ by\ Pb(NO_3)_2}=0.0464molPb(NO_3)_2*\frac{2molKI}{1molPb(NO_3)_2} =0.0928molKI[/tex]

Hence, as only 0.0789 moles of KI are available, KI is the limiting reactant, therefore the formed grams of PbI2, considering its molar mass of 461.01 g/mol and 2:1 molar ratio, are:

[tex]m_{PbI_2}=0.0789molKI*\frac{1molPbI_2}{2molKI} *\frac{461.01gPbI_2}{1molPbI_2} \\\\m_{PbI_2}=18.2gKI[/tex]

Best regards.

Answer:

kci represents the formula of salt

KCl exists potassium chloride made of potassium and chloride. They are considered salt because they form K+ and Cl- ions, not OH- or H+ ions.

What is meant by chemical equation?

Chemical equations are symbolic depictions of chemical reactions in which the reactants and products are stated in terms of their corresponding chemical formulae.

Chemical equations, which are expressions that list the names and amounts of the chemicals involved in a process, are used to describe chemical reactions. The initial compound(s)—the reactants—and the final compound(s)—the products—are separated by an arrow in a chemical equation.

Therefore, the correct answer is option b) KCl.

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The part of Dalton's atomic theory that was disproved by Thomson's experiment is toms cannot be created, destroyed, or divided into smaller particles. The correct option is A.

According to Dalton's atomic theory, atoms are tiny units of matter that make up all matter, including elements, compounds, and mixtures.

Following are some of the theory's postulates: All substance is made up of atoms, which are exceedingly tiny particles. Atoms belonging to the same element share the same mass and chemical composition.

Thomson presented the plum pudding model of the atom, which contained positively charged "soup" and negatively charged electrons inside.

Thus, the correct option is A. Atoms cannot be created, destroyed, or divided into smaller particles.

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Complete Question

The complete question is shown on the first uploaded image  

Answer:

The density is  [tex]\rho = 8.21479 g/cm^3[/tex]

Explanation:

From the question we are told that

         the lattice constant is  [tex]a = 0.295 nm = 0.295*10^{-9} = 0.295*10^{-7} cm[/tex]

The density of Copper ([tex]\beta[/tex]) is mathematically represented as

     [tex]\rho = \frac{ZM}{a^3N_A}[/tex]

Where  Z is the number of units in a unit cell and  for BCC crystals  Z =2

          M is the molar mass of copper which same for Copper with a value of  

           [tex]M = 63.5 g/mol[/tex]

          [tex]N_A[/tex] is the Avogadro's constant with a value of  [tex]N_A = 6.022*10^{23}[/tex]

Substituting values

       [tex]\rho = \frac{2 *63.5}{(0.295*10^{-7})^3 * (6.022*10^{23})}[/tex]

      [tex]\rho = 8.21479 g/cm^3[/tex]

Answer:chicken

Explanation:There are many types of chicken

Answer:

The formula for sodium sulfide is Na2S.

Answer:

NA2S

Explanation:

the compound formed was sodium sulphide

therefore the chemical formula is NA2S