Which physical property does the inventor need to consider when choosing a
material for the container?
A. Ductility
B. Thermal conductivity
C. Transparency
D. Electrical conductivity

Answer: A

Explanation: not sure what to say but it’s for sure A it makes sense :) good luck !

The statement best explains why an object appears green in sunlight is (D) More green light is reflected while more red and blue light is absorbed.Hence the correct option is (D).

Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated.

Common examples include the reflection of light, sound and water waves.

Colored objects look the way they do because of reflected light. When sunlight is shined on a green leaf, the violet, red and orange wavelengths are absorbed. The reflected wavelengths appear green.

Therefore, The statement best explains why an object appears green in sunlight is (D) More green light is reflected while more red and blue light is absorbed.Hence the correct option is (D).

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Answer:

pH = 2.059

Explanation:

At the Cathode:

The reduction reaction is:

[tex]2H^+ + 2e^- \to H_2 \ \ \ \mathbf{E^0_{red}= 0.00 \ V}[/tex]

At the anode:

At oxidation reaction is:

[tex]Zn \to Zn^{2+} +2e^- \ \ \ \mathbf{E^0_{ox} = 0.76 \ V}[/tex]

The overall equation for the reaction is:

[tex]\mathbf{Zn + 2H^+ \to Zn^{2+} + H_2}[/tex]

The overall cell potential is:

[tex]\mathbf{E^0_{cell}= E^0_{ox} + E^0_{red}}[/tex]

[tex]\mathbf{E^0_{cell}= 0.76 \ V +0.00 \ V}[/tex]

[tex]\mathbf{E^0_{cell}= 0.76\ V}[/tex]

Using the formula for the Nernst equation:

[tex]E = E^0 - ( \dfrac{0.0591}{n})log (Q)\\[/tex]

where;

E = 0.66

(Zn^2+)=0.22 M

Then

[tex]0.66 =0.76- ( \dfrac{0.0591}{2})log \bigg ( \dfrac{[Zn^{2+} ] PH_2}{[H^+]^2} \bigg )[/tex]

[tex]0.66 =0.76- 0.02955 * log \bigg ( \dfrac{0.22*0.87}{[H^+]^2} \bigg )[/tex]

3.4 = log ( 0.1914) - 2 log [H⁺]

3.4 = -0.7180 - 2 log [H⁺]

3.4 + 0.7180 = - 2 log  [H⁺]

4.118  = - 2  log  [H⁺]

pH = log [H⁺] = 4.118/2

pH = 2.059

The pH of the solution as described in the question is 2.7.

The equation of the reaction is;

Zn(s) + 2H^+(aq) ----> Zn^2+(aq) + H2(g)

The partial pressure of hydrogen can be converted to molarity using;

P= MRT

M = P/RT

M =  0.87atm/0.082 LatmK-1mol-1 × 298 K = 0.036 mol/L

We have to obtain the reaction quotient

Q = [Zn^2+] [H2]/[H^+]^2

Q = [0.22 ] [0.036]/[H^+]^2

Recall that, from Nernst equation;

E = E° - 0.0592/nlog Q

E° = 0.00V - (-0.76V) = 0.76V

0.660 =  0.76 - 0.0592/2logQ

0.660 - 0.76  =  - 0.0592/2logQ

-0.1 =  - 0.0592/2logQ

-0.1 × 2/ - 0.0592 = logQ

3.38 = log Q

Q = Antilog (3.38)

Q= 2.39 × 10^3

Now;

2.39 × 10^3 =  [0.22 ] [0.036]/[H^+]^2

2.39 × 10^3 = 7.92  × 10^-3/[H^+]^2

[H^+]^2 = 7.92  × 10^-3/2.39 × 10^3

[H^+] = 1.82  × 10^-3

pH = -log[H^+]

pH = -log[ 1.82  × 10^-3]

pH = 2.7

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Answer:

Partial pressure of oxygen = 23.38 kpa (Approx)

Explanation:

Given:

Amount of oxygen = 23.15%

Amount of nitrogen = 76.85%

Pressure (missing) = 101 kpa

Find:

Partial pressure of oxygen

Computation:

Partial pressure of oxygen = [Amount of oxygen x Pressure]/100

Partial pressure of oxygen = [23.15% x 101]/100

Partial pressure of oxygen = 23.38 kpa (Approx)

Answer:

This may or may not be right its been a while since I took chemistry but 63.78%

Explanation:

The yield is 50.9 so you would divide the yield by the source.

50.9/79.8= .637844621

than conver that to a percentage and you have your answer I think.

May or may not be right like I said it's been a while but I hope its right and it helps.

Answer:

Percentage of HCL = 37.11 % (Approx)

Molarity = 16.17 m (Approx)

Explanation:

Given:

Molarity = 12.0 M  of hcl

Density = 1.18 g/ml

Computation:

1L of hcl solution contains = 12 moles

Mass = Moles x Molar mass

Mass of HCl = 12 x 36.5

Mass of HCl  = 438 g  = 0.438 kg

Mass of 1 L solution =  1.18 x 1,000 ml

Mass of 1 L solution = 1180 g

Percentage of HCL = [438/1180]100

Percentage of HCL = 37.11 % (Approx)

Molarity = 12 / [1.18 - 0.438]

Molarity = 12 / [0.742]

Molarity = 16.17 m (Approx)

Answer:

[tex]$\Delta S = -10.95 \ \frac{J}{K}$[/tex]

Explanation:

Given :

Number of mole, n = 0.720 mol

Initial volume, [tex]$V_1$[/tex] = 24. 32 L

Final volume, [tex]$V_2$[/tex] = 3.90 L

We know entropy change,

[tex]$\Delta S = c_V\ln \left(\frac{T_2}{T_1}\right) + n R \ln \left(\frac{V_2}{V_1}\right)$[/tex]

For isothermal compression temperature constant,

[tex]$\Delta S = n R \ln \left(\frac{V_2}{V_1}\right)$[/tex]

[tex]$\Delta S = 0.720 \times 8.314 \times \ln \left(\frac{3.90}{24.32}\right)$[/tex]

[tex]$\Delta S = -10.95 \ JK^{-1}$[/tex]

[tex]$\Delta S = -10.95 \ \frac{J}{K}$[/tex]

Answer: Units. The SI derived unit of frequency is the hertz (Hz), named after the German physicist Heinrich Hertz. One hertz means that an event repeats once per second.

The frequency is the number of waves that pass a point in space during any time interval, usually one second. We measure it in units of cycles (waves) per second, or hertz. The frequency of visible light is referred to as color, and ranges from 430 trillion hertz, seen as red, to 750 trillion hertz, seen as violet.

Frequency of an electromagnetic wave is the number of wave cycles per unit time. The SI unit of frequency is Hertz or Hz. Frequency is represented by the symbol v called neu.

Waves are propagation or transfer of energy through air or vacuum. An electromagnetic wave is associated with a combined electric field and magnetic field.

Waves are associated with characteristic frequency and wavelength. Wavelength of a wave is the distance between its two consecutive crests or troughs.

Frequency of a wave is the number of wave cycles per unit time. Its is expressed in the unit of Hertz or Hz. Frequency and wavelength are in inverse relation. The shortest waves have greater energy and greater frequency.

Frequency is inverse of time of propagation. So that it can also be used in s⁻¹ which is equal to one hertz.

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Answer:

nucleus

Explanation:

Answer:

Nucleus Is the control center of the cell

Explanation:

Hope it help

Answer:

Solid

Explanation:

Answer:

(Z)-4-methyl-2-pentene

Explanation:

Hydrogenation  is a syn addition. This implies that the hydrogen atoms add to the same face of the multiple bond.

Hence, if we have the alkyne,  4-methyl-2-pentyne which reacts with excess hydrogen in the presence of a platinum catalyst, we obtain  (Z)-4-methyl-2-pentene since the hydrogen atoms add on the same side of the multiple bond.

Answer:

be equal once equilibrium is reached.

Explanation:

Given an equilibrium proton transfer such as the one written below;

HA + :B ⇄ HB + :A

The rate of forward reaction and the rate of reverse reaction becomes equal at equilibrium.

To put it in another way, at equilibrium, the rate of forward and reverse rates of proton transfer will  be equal.

Answer:

Molarity = 2 M

Explanation:

Given data:

Molarity of solution = ?

Number of moles = 2 mol

Volume of water = 1 L

Solution:

Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.

Formula

Molarity = number of moles of solute / L of solution

Molarity = 2 mol / 1 L

Molarity = 2 M

Explanation:

A chemical reaction that has a positive ΔH is said to be endothermic, while a chemical reaction that has a negative ΔH is said to be exothermic.

The body fat of humans can be measured by the density in grams per mL. The volume of the fat with a density of 0.94 g/mL and mass of 5.2 lb is 2.50 L.

The volume is the factor of the dimension that inversely affects the density of the substance. The volume is given by the division of the mass by the density. It can be given in mL or cubic centimeters.

Given,

Mass of body fat = 5.2 lb

Density of human fat = 0.94 g/mL

At first, mass is converted from lb to grams as:

1 lb = 453.592 grams

So, 5.2 lb = 2358.68 grams

Secondly, volume is calculated as:

Volume = Mass ÷ density

V = 2358.68 grams ÷ 0.94 g/mL

= 2509.23 mL

Thirdly, volume from ml is converted to L as:

1 mL = 0.001 L

2509.23 mL = 2.50 L

Therefore, 2.50 liters of body fat has to be removed from the body.

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Answer:

12ml should be the answer

Explanation:

Explanation:

1. The group of atoms above bonded together is

called a molecule.

Therefore,

Option A is correct ✔

2. There's 4 H-atom in 2H₂O

Therefore,

Option A is correct ✔

3. There's 2 molecules in 2Al₂O₃

Therefore,

Option A is correct ✔

Answer:

ethene

Explanation:

just took the test :D

Answer:

129.4g

Explanation:

Reaction equation":

            4Al   + 3O₂  →  2Al₂O₃

Given mass of oxygen  = 115g

Unknown:

mass of aluminum metal that reacted;'

Solution:

We need to convert the given mass of O₂ to mole;

  Number of moles  = [tex]\frac{mass}{molar mass}[/tex]

       Molar mass of O₂ = 2(16) = 32g/mol

    Number of moles  = [tex]\frac{115}{32}[/tex]   = 3.6mol

From the balanced reaction equation:

  3 moles of O₂ reacted with 4 mole of Al

  3.6 moles of O₂ will react with [tex]\frac{3.6 x 4}{3}[/tex]   = 4.8mol

Mass of Al  = number of moles x molar mass

Mass of Al  = 4.8 x 27  = 129.4g

Answer:

6

8

6

Explanation:

 Isotope given:

                       ¹⁴₆C

In specie written as this;  

   Superscript  = Mass number

   Subscript  = Atomic number

To find the protons, it is the same as the atomic number;

                Protons  = Atomic number  = 6

Neutrons have no charges;

 Neutrons  = Mass number - Atomic number  =

  Neutrons  = 14 - 6  = 8

The number of electrons is the same as the atomic number = 6

Concepts used:

1 mole of an element or a compound has 6.022 * 10²³ formula units

So, we can say that: Number of formula units = number of moles * 6.022*10²³

number of moles of an element or a compound = given mass/molar mass

__________________________________________________________

003 - Number of CaH₂ formula units in 6.065 grams

Number of Moles:

We know that the molar mass of CaH₂ is 42 grams/mol

Number of Moles of CaH₂ = given mass/molar mass

Number of moles = 6.065 / 42

Number of moles = 0.143 moles

Number of Formula units:

Number of formula units = number of moles * 6.022*10²³

= 0.143 * 6.022 * 10²³

= 0.86 * 10²³ formula units

__________________________________________________________

004 - Mass of 6.34 * 10²⁴ formula units of NaBF₄

Number of Moles:

We mentioned this formula before:

Number of formula units = number of moles * 6.022*10²³

Solving it for number of moles, we get:

Number of moles = Number of Formula units / 6.022* 10²³

replacing the variable

Number of moles = 6.34 * 10²⁴ / 6.022*10²³

Number of moles=  10.5 moles

Mass of 10.5 moles of NaBF₄:

Molar mass of NaBF₄ = 38 grams/mol

Mass of 10.5 moles = 10.5 * molar mass

Mass of 10.5 moles = 10.5 * 38

Mass = 399 grams

__________________________________________________________

005 - Number of moles in 9.78 * 10²¹ formula units of CeI₃

Number of Moles:

We have the formula:

Number of moles = Number of Formula units / 6.022* 10²³

replacing the variables

Number of Moles = 9.78 * 10²¹ / 6.022*10²³

Number of Moles = 1.6 / 10²

Number of Moles = 1.6 * 10⁻² moles   OR   0.016 moles

Molecules which have a larger size as compared to pores of cell membrane then they can't pass through it.

Water, carbon dioxide, glucose and oxygen are some of the molecules that can pass through the cell membrane of the cell by the process of diffusion while on the other hand, large molecules such as sugars and proteins can't enter inside the cell due to their large size.

The cell has semipermeable membrane which has small pores. Through these pores small size materials can pass through whereas large molecules can't pass through it due to their large size so we can conclude that molecules which have a larger size as compared to pores of cell membrane then they can't pass through it.

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Answer:

Galileo performed a famous experiment where he used a ball rolling on a ramp (inclined plane) to study the motion of objects under the influence of gravity. The ramp allowed him to make more precise measurements because the ball moved more slowly along the ramp than if it were simply dropped. Galileo discovered through this experiment that the objects fell with the same acceleration, proving his prediction true, while at the same time disproving Aristotle's theory of gravity (which states that objects fall at speed proportional to their mass). Galileo's conclusion from this thought experiment was that no force is needed to keep an object moving with constant velocity. Newton took this as his first law of motion. One result of the experiment surprised Galileo, and one surprises us. Galileo found that the heavy ball hit the ground first, but only by a little bit. Except for a small difference caused by air resistance, both balls reached nearly the same speed. And that surprised him. According to history, Galileo’s experiment on falling bodies largely contributed to Isaac Newton’s Law of Gravity. In Galileo’s experiment, he is said to have dropped balls from the Leaning Tower of Pisa. The balls were made of the same material but had different masses. Galileo set out to prove that the time it took for these objects to reach the ground would be the same. Galileo proved that objects reached the ground at the same time,

Explanation:

I think this is right & I hope this helped

Galileo demonstrated that gravity causes things of various masses to fall with the same acceleration by dropping weights from the leaning Tower of Pisa.

Gravitational force is the force by an object attracts other objects into its center of mass. Earth attracts every objects on its surface to the ground by gravitational pull.

The outcome of Galileo's gravity experiment supports the equivalence principle, which forms the basis of general relativity, Albert Einstein's theory of gravity.

According to this theory, an object's inertial mass which determines how quickly it accelerates when a force is applied and gravitational mass which determines how much of a gravitational force it experiences are the same. The conclusion is that an object's acceleration due to gravity is dependent of both its mass and composition.

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Answer:

[tex]HClO+H_2O\rightarrow H_3O^++ClO^-[/tex]

Explanation:

Hello!

In this case, since hypochlorous acid (HClO) is a weak acid, which means it is not complete ionized in aqueous solution, represented by the reaction with water to obtain hydronium ions, which are the responsible of its acidity, and hypochlorite ions, we can write:

[tex]HClO+H_2O\rightleftharpoons H_3O^++ClO^-[/tex]

It is seen it is already balanced since there are three hydrogen atoms, one chlorine atom and two oxygen atoms at both reactants and products. It is important to notice the presence of the equilibrium arrow, which represents that the hydronium ions and the chlorate ions are able to come back to the initial hypochlorous acid and water.

Best regards!

Answer:

The molar mass and molecular weight of Al(CH3CO2)3 is 204.1136.

Explanation:

Answer:

168.1 g/mol

General Formulas and Concepts:

Chemistry

Explanation:

Step 1: Define

Al(CH₃O₂)₃

Step 2: Find molar masses

Molar Mass of Al - 26.98 g/mol

Molar Mass of C - 12.01 g/mol

Molar Mass of H - 1.01 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of Al(CH₃O₂)₃ - 26.98 + 3(12.01) + 9(1.01) + 6(16.00) = 168.1 g/mol

Answer:

i podwmk

Explanation: