!! How much has CO2 in the atmosphere increased since the Industrial Revolution? In the 10,000 years before the Industrial Revolution in 1751, carbon dioxide levels rose less than 1 percent. Since then, they've risen by

89.74% is the percentage yield of the product. Hence, option D is correct.

The percentage can be calculated by dividing the value by the total value and then multiplying the result by 100.

Given data:

Actual yield of product = 2.80 g

Theoretical yield = 3.12 g

Percent yield = ?

Formula:

Percent yield =  [tex]\frac{\;actual \;yield \;X \;100}{theoretical \;yield}[/tex]

by putting values in the formula,

Percent yield =[tex]\frac{2.80 g X 100}{ 3.12 g}[/tex]

Percent yield = 89.74%

Hence, option D is correct.

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The species that is the conjugate acid is HC₂H₃O₂(aq). The correct option is d.

Conjugates acids are those acids which are made when an acid donates a proton to a base according to Bronsted Lowry theory.

In other words, we can say that it is an acid with hydrogen ion. An example is  water (base) reacting with an acid to form the hydronium ion (conjugate acid).

Thus, the correct option is d, HC₂H₃O₂(aq).

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Answer:

it looks smaller for sure ^_^

Answer:

2S02 + O2 ---> 2SO3

Its balanced now as Reactants = Products.

3.745 x [tex]10^{-19}J[/tex] is the minimum energy needed to eject electrons from a metal with a threshold frequency of 5.65 x [tex]10^{14}s^{-1}[/tex]

The minimum frequency needed to cause electron ejection is referred to as the threshold frequency.

The energy carried by the incident light is E=hf

Where h is the Planck constant and f is the frequency of the light. The threshold frequency is the frequency that corresponds to the minimum energy needed to eject the electrons from the metal, so if we substitute the threshold frequency in the formula, we get the minimum energy the light must have to eject the electrons:

E=hf

h=6.63 x [tex]10^{-34}Js[/tex]

f=5.65 x [tex]10^{14}s^{-1}[/tex]

E=6.63 x [tex]10^{-34}Js[/tex] x 5.65 x [tex]10^{14}s^{-1}[/tex]

E= 3.745 x [tex]10^{-19}J[/tex]

Thus, 3.745 x [tex]10^{-19}J[/tex] is the minimum energy needed to eject electrons from a metal with a threshold frequency of 5.65 x [tex]10^{14}s^{-1}[/tex]

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Answer:

10moles

Explanation:

mole ratio = 8:16

therefore

1 mole Li2S forms 2 moles Li

when 5 moles Li2S reacts

5 moles Li2S = 5 x 2 moles Li

= 10 moles Li

An aqueous solution contains the following ions Cl⁻, Ag⁺, Pb²⁺, NO₃⁻ & SO₄²⁻ and more than one precipitate will form are AgCl, PbCl₂, PbSO₄ & Ag₂SO₄.

Precipitate is the insoluble compound which is present at the bottom of any chemical reaction in the solid state.

If in an aqueous solution Cl⁻, Ag⁺, Pb²⁺, NO₃⁻ & SO₄²⁻ ions are present then:

Hence precipitates are AgCl, PbCl₂, PbSO₄ & Ag₂SO₄.

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Answer:

all of the above

Explanation:

chlorophyll in found in virtually all photosynthetic organisms

Voltage-gated sodium channels are the ion channels that conduct sodium ions. They are sensitive to the extracellular concentration of calcium ions.

Voltage-gated sodium channels are the signaling ion channels that are responsible for increasing the action potential of the nerve cells. VGSC is the most important resting and action potential of the cell.

These channels are sensitive to the high concentration of calcium ions as these ions cause the channels to open up on the membrane surfaces of the cell. This causes a change in the concentration of the gradient across the membrane.

Therefore, VGSC is sensitive to calcium ions.

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Answer:

m=0.000107 kg

Explanation:

H=m*cp*change in temperature

0.296=m*4182*0.661

m=0.000107 kg

The time taken by Carbon-14 to decay radioactively from 120g to 112.5g is 22,920 years.

Time required for the whole radioactive decay of any substance will be calculated by using the below link:

T = (n)(t), where

Initial mass of Carbon-14 = 120g

Final mass of Carbon-14 = 112.5g

Left mass = 120 - 112 = 7.5g

Number of required half life for this will be:

4 half lives are required, now on putting values we get

T = (4)(5730) = 22,920 years

Hence required time for the decay is 22,920 years.

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That's correct! When two different air masses meet, the boundary zone between them is called a front. The process of formation of the fronts is known as frontogenesis.

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Hope this helps! :)

Answer:

D

Explanation:

2-bromopropanoic acid is optically active because it contains chiral carbon bonded with 4 different atom ( CH3,H,COOH,Br).

Answer:

Hydrogen

Explanation:

These are what hydrogen isotopes look like

Answer:

Explanation:

By definition 3 moles of water molecules. Or about 3 * 6.022140E23 water molecules = 1.806642E24 water molecules.

hope this is right..

Answer: Simply multiply Avogadro's number(6.02x10^23) by 3 and that's your answer. Use a scientific calculator

Explanation:

Answer:

b

Explanation:

b is the answer to your question

P=nRT/V

P ≈ 1/V = decreasing volume

P ≈ T = increasing temperature

P ≈ n = adding one more mole of helium

Answer:

One of the purposes of the Marshall Plan was to aid nations in economic recovery from WWII.

Explanation:

The Marshall Plan aided the defeated Axis powers because that's one of the reasons it was created, The Marshall Plan was supposed to rehabilitate the economies of the 17 western and southern European countries in order to create stable conditions for democracy to continue.

Answer:

B

Explanation:

Answer:

False

Bouyant force = volume of displaced fluid * density of fluid

The partial pressure of carbon dioxide is 75 torr.

Dalton's theory of gas states that total pressure of the mixture of gas sample is equal to the sum of the partial pressure of all the gases present in that sample.

Given that,

On putting values, we get

Partial pressure of carbon dioxide = 825 - (600 + 150) = 75 torr

Hence Partial pressure of carbon dioxide is 75 torr.

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Answer:

The answer is B. sound; light

Explanation:

A car bumper is primarily meant to reduce the impact of damages to the front and rear ends of vehicles in case of collision.

Cars are equipped with bumpers both at the rear and front ends primarily for protective purposes.

The front end bumper reduces the impact of front collisions on the cooling system and the bonnet while the rear end bumper functions to protect the exhaust, the trunk, and several other parts in case of rear-end collisions.

Aside from protective functions, bumpers also serve to add beauty to cars.

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Atmospheric gases can be liquefied by applying pressure and lowering temperature.

Answer: 1.14 M

Explanation:

500 mL is equal to 0.5 L.

So, the molarity is (0.570)/(0.5) = 1.14 M

The amount in grams of oxygen are needed to react with 25g of Mg is 16.48 grams.

Mass into moles or vice versa of any substance will be calculated by using the below formula as:

n = W/M, where

W = given mass

M = molar mass

Moles of Magnesium = 25g / 24.3g/mol = 1.028 = 1.03 mol

Chemical reaction will be:
2Mg + O₂ → 2MgO

From the stoichiometry of the reaction it is clear that 1 mole of oxygen is reacts with 2 moles of magnesium, so 1.03 moles of magnesium will reacts with (1/2)(1.03) = 0.515 moles of oxygen.

Mass of oxygen = (0.515mol)(32g/mol) = 16.48g

Hence required mass of oxygen is 16.48 grams.

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