what is the relative atomic mass of a hypothetical element that consists of the following isotopes in the indicated natural abundances?? pls help

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:

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:

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: 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:

Lead

Explanation:

Lead (Pb) has atomic number 82

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

Answer:

lead

Explanation:

Answer:

C6H6 < C7H15OH < C6H13OH < C2H5OH

Explanation:

Hello,

In this case, since the organic molecules solubility is defined in terms of the presence of hydrogen bonds as intermolecular forces, which are formed between oxygen and hydrogen and the length of the organic chain, we can notice that hydroxyl-containing longer chains tend to be less water soluble whereas shorter chains more soluble as the polar part of the chain will lead the solubility. In addition to it, chains with lack of oxygen tend to be highly water insoluble. Therefore, we can notice that C6H6 is the least water soluble, next C7H15OH, then C6H13OH and the most soluble is C2H5OH.

Best regards.

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:

10

Explanation:

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

Answer:

Solids have a definite shape and volume. Liquids have a definite volume, but take the shape of the container. Gases have no definite shape or volume.

Explanation:

Answer:

Liquids properties include retention of volume and its conformation to the shape of its container. The  

particles in a liquid have more kinetic energy than the particles in the corresponding solid. Solids are  

structurally rigid and resist changing shape or volume. Solid particles have the least amount of kinetic  

energy. Properties of gas include easily compressible, the expand to fill their container and they occupy  

more space than a solid or liquid. Gas particles have the most amount of kinetic energy

Explanation:

kkknskndcnndcks

a

Answer:

Explanation:

Answer:the answer is DI

Explanation:APΣX

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:chicken

Explanation:There are many types of chicken

Answer:

18.7887 g of NaCl

Explanation:

The question reads - How many grams of NaCl will be produced from 18.0 g of Na and 23.0 g of Cl2?

Let us start by writing out the balanced equation of the reaction:

Na + Cl2 ---> NaCl2

1 mole, each of Na and Cl2 is required to produce 1 mole of NaCl.

mole = mass/molar mass

Therefore

18 g of Na = 18/23 = 0.7826 mole

23 g of Cl2 = 23/71 = 0.3239 mole

In this case, the Na is in excess and the Cl2 becomes the limiting reagent. Hence

0.3239 mole of Cl2 will react with 0.3239 mole of Na to yield 0.3239 mole of NaCl.

mass of 0.3239 mole NaCl = 0.3239 x 58 = 18.7887 g

Hence, 18.7887  grams of NaCl will be produced from 18.0 g of Na and 23.0 g of Cl2.

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:

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:

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: 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:

B) THE DEPTH OF THE LAKE IS 0.060 m

Explanation:

b) Determine the depth of the lake in metres

1. Using the general gas law, we will calculate the initial pressure of the air bubbles.

P1V1 /T1 = P2V2/T2

P1 = Unknown

T1 = 5.24 °C

T2 = 18.73 °C

P2 = 0.973 atm

V1 = V1

V2 = 6V1

P1 = P2 V2 T1 / V1 T2

P1 = 0.973 * 6V1 * 5.24 / V1 * 18.73

P1 = 5.09852 * 6 / 18.73

P1 = 30.59112 / 18.73

P1 = 1.633 atm.

2. Calculate the depth of the lake:

             Pressure = length * density * acceleration

            length = Pressure / density * acceleration

Pressure = 1.633 atm = 1.633 * 101, 325 Nm^2 = 165, 463.725 Nm^2

Density =  1.02 g/cm3 = 1.02 * 10^3 kg/m^3

Acceleration = 9.8 m/s^2

So therefore, the length in metres is:

Length = density * acceleration / pressure

Length =  1.02 *10^3 * 9.8 / 165, 463.725  

Length = 9.996 * 10^3 / 165 463.725

Length = 0.06 m

Hence, the depth of the lake is 0.06 m

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:

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:

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:

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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Answer:

The formula for sodium sulfide is Na2S.

Answer:

NA2S

Explanation:

the compound formed was sodium sulphide

therefore the chemical formula is NA2S

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: Yes

Explanation: Since strong acids react with and use up water molecules, and strong bases do not