What is the pH of a solution whose [H⁺] is 2.7 x 10⁻⁴ M?

Answer:

d

Explanation:

the outer planets are uranus neptune jupiter and saturn also the sun all way bigger than the earth

Commercial agriculture can lead to water-quality problems because water can be used for irrigation and washing chemical products.

The term commercial agriculture makes reference to the techniques to produce high yields in extensive crops.

Commercial agriculture may lead to contamination problems due to the use of herbicides and pesticides.

In conclusion, commercial agriculture can often lead to water-quality problems because water can be used for irrigation and washing chemical products.

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The number of mole of HCl required to neutralize all 0.05 mole of Ca(OH)₂ is 0.1 mole

Ca(OH)₂ + 2HCl —> CaCl₂ + 2H₂O

From the balanced equation above,

1 mole of Ca(OH)₂ required 2 moles of HCl

From the balanced equation above,

1 mole of Ca(OH)₂ required 2 moles of HCl

Therefore,

0.05 mole of Ca(OH)₂ will require = 0.05 × 2 = 0.1 mole of HCl

Thus, 0.1 mole of HCl is needed for the reaction

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The mass of NaOH that is necessary to neutralize 8.90 mol of HCl is 356 grams.

Mass of any substance will be calculated from moles by using the below equation as:

n = W/M, where

W = required mass

M = molar mass

Neutralization reaction will be:

NaOH + HCl → NaCl + H₂O

From the stoichiometry it is clear that 1 mole of NaOH is required to neutralize 1 mole of HCl, so that 8.90 moles of NaOH is needed.

Mass of 8.9 moles of NaOH = (8.9mol)(40g/mol) = 356g

Hence required mass of NaOH is 356 grams.

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Explanation:

Here is the solution...hope it helps:)

Answer: 0% No offspring can display the recessive trait

just did the test

The resultant moles of nitrogen gas that are present in the container is 2.96 moles.

Mass of any substance will be converted into moles by using the below equation as:

n = W/M, where

From the ideal gas equation of gas we know that moles and volume is directly proportional to each other and for this question equation becomes,

V₁/n₁ = V₂/n₂, where

On putting all values, we get

n₂ = (5L)(1.78mol) / (3L) = 2.96 moles

Hence required moles of nitrogen gas are 2.96.

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Answer:

Elements were formed from a supernova in space that was so powerful, it gave us almost all the elements we have today.

The statement that bronsted - lowry model can apply to bases that do not contain hydroxide ions is true.

The Bronsted - Lowry theory, also known as the proton theory of acids and bases, is a theory developed independently by chemist Johannes Nicolaus Bronsted and English chemist Thomas Lowry in 1923.

The theory states that as acid is a substance that can donate electrons and bases are those which can accept electrons.

Thus, the statement that bronsted - lowry model can apply to bases that do not contain hydroxide ions is true.

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Answer:

.475 M

Explanation:

USe periodic table to find mole weight of HCl

   H = 1.008     Cl = 35.45      total   36.458 gm / mole

Find the numebr of moles    in 52 gm

 52 gm / ( 36.458 gm / mole) = 1.426 moles

1.426 moles / 3 L = .475 M

In the decomposition reaction, the reactants split into products. The mass of carbonic acid that will be produced from the decomposition of sodium bicarbonate is 1.67 gm.

Mass is the product of the moles and the molar mass of the substance. It is the weight present of the substance in reaction and is calculated in grams.

The decomposition reaction can be shown as,

[tex]\rm 2NaHCO_{3} \rightarrow Na_{2}CO_{3} + H_{2}CO_{3}[/tex]

From the reaction, it can be seen that 2 moles of sodium bicarbonate decompose to produce 1 mole each of carbonic acid and sodium carbonate.

Moles of sodium carbonate is calculated to estimate the mass of carbonic acid:

[tex]\begin{aligned} \rm moles &= \rm \dfrac{mass}{molar\; mass}\\\\&= \dfrac{2.86}{105.99}\\\\&= 0.02698\;\rm moles\end{aligned}[/tex]

Mass of carbonic acid is calculated as:

[tex]\begin{aligned} \rm mass &= \rm moles \times molar\; mass\\\\&= 0.02698 \times 62.03 \\\\&= 1.67 \;\rm gm\end{aligned}[/tex]

Therefore, 1.67 gm of carbonic acid will be produced.

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Answer:

Heterogeneous

Explanation:

Answer:

Extinction.

Explanation:

Animals living off coral would die with no food to eat ruining millions of food chains

Answer:

The Coral reefs provide protection against flooding and the erosion of coastlines. With them gone, there will be rapid erosion of coastlines and many small island countries might even vanish from the world map

Explanation:

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The acid ionization constant (ka) of an unknown acid if a 0.030M solution of it has a pH of 2.946 is 4.8×10⁻⁵.

Relation between the pH and [H⁺] will be shown as:

[H⁺] = [tex]10^{-pH}[/tex]

Given that pH of solution = 2.946

[H⁺] = [tex]10^{-2.946}[/tex] = 0.00113 = 0.0012

Let the ICE table for the unknown acid HA will be:

                                   HA    ⇄    H⁺   +     A⁻

Initial:                          0.03          0           0

Change:                   -0.0012    0.0012   0.0012

Equilibrium:        0.03-0.0012  0.0012   0.0012

Acid dissociation constant will be calculated as:
Ka = [0.0012][0.0012] / [0.03-0.0012]

Value of 0.0012 is very small as compared to the 0.03, so the equation becomes

Ka = (0.0012)² / 0.03 = 0.000048 = 4.8×10⁻⁵

Hence value of Ka is 4.8×10⁻⁵.

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Answer:

Option #1: shiny solid, conducts heat and electricity, easily bends

Explanation:

alkaline-earth metal, any of the six chemical elements that comprise Group 2 (IIa) of the periodic table. The elements are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).

These physical properties of group 2 elements are: low density (mass over volume) low melting points (except beryllium) low boiling points (except beryllium)

♡ The Question/Task(s)! ♡

✦ || An element in Group 2 of the periodic table likely has which characteristics?

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♡ The Answer(s)! ♡

✦ || The answer is, "Shiny solid, conducts heat and electricity, easily bends"!

I apologize in advance if the answer is incorrect! ♡

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♡ The Explanation(s)/Step-By-Step! ♡

✦ || The elements in Group 2 of the periodic table consist of malleable metals! The elements have a soft metallic texture that can be shaped, and can conduct a source of both electricity and heat!

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Answer:

See below ~

Explanation:

Sea water has a high amount of salt present in it. The density of salt is higher than that of water. It dissolves in water, thereby increasing its density. Hence, this is why sea water has a higher density than tap water.

Answer:

sea water have high density and also they're moving from one side to another more than tap water

tap water have less density and also they're not moving ever they ain't move than sea water

Answer:

The atomic weight of an element represents the ratio of the average mass of atoms of a chemical element.

Answer: polymers

Explanation:

Polymers are huge natural molecules are connected with small natural molecules 

The correct statements which explain why rocks weather at different rates are: A. Softer, porous, or more permeable rocks weather faster than harder rocks. B. Rocks in warmer climates weather faster than rocks in colder climates. and D. The more water present, the faster the rate of weathering. Hence , Option A , B and D are correct

Weathering can be defined as both the physical and chemical breakdown of a rock into smaller fragments (pieces) called sediment.

Generally, rocks weather at different rates based on the following reasons:

Some of the natural phenomenon that influences rock cycle include the following;

Therefore , The correct statements which explain why rocks weather at different rates are: A. Softer, porous, or more permeable rocks weather faster than harder rocks. B. Rocks in warmer climates weather faster than rocks in colder climates. and D. The more water present, the faster the rate of weathering. Hence , Option A , B and D are correct

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Answer: A., B., D.

Explanation:

Answer:

When ions move over a polar cap of Earth, the changing shape of the magnetic field lines bends the drift path induced by the electric field normal to the magnetic field. The centrifugal acceleration associated with this bending shoots the ions away from the Earth along the magnetic field lines

Explanation:

The grams of nitrogen gas inhaled are 0.0322816 moles.

Mass is the quantity of matter of a physical body.

No. of molecule inhaled by a person is [tex]9. 72 \times 10^2^1[/tex]

Nitrogen is a diatomic molecule, so it will contain 2 atoms.

Number of nitrogen atoms

[tex]9. 72 \times 10^2^1 \times 2 = 19.44 \times 10^2^1[/tex]

1 mole contain = [tex]6.022 \times 10^2^3[/tex]

So, number of moles of nitrogen

[tex]\dfrac{9. 72 \times 10^2^1}{6.022 \times 10^2^3} = 3.22816 \times 10^-^2\\\\= 0.0322816 \;moles[/tex]

Thus, the grams of nitrogen gas inhaled are 0.0322816 moles.

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Answer:

10.72 %

Explanation:

17.9/(17.9+149)=.1072   =   10.72%

Water from a well is more likely to be clean to drink as compared to the water from river.

Source water refers to bodies of water that contribute water to public drinking water sources and private wells (such as rivers, streams, lakes, reservoirs, springs, and ground water).

Water which came from underground sources are clean and well to drink as no impurities were present in that, whereas the water from rivers are not that much of clean as many human activities make them impure.

Hence water from well is clean to drink.

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Climate change refers to long-term shifts in temperatures and weather patterns. These shifts may be natural, such as through variations in the solar cycle. But since the 1800s, human activities have been the main driver of climate change, primarily due to burning fossil fuels like coal, oil, and gas.

Burning fossil fuels generates greenhouse gas emissions that act like a blanket wrapped around the Earth, trapping the sun’s heat and raising temperatures.

Examples of greenhouse gas emissions that are causing climate change include carbon dioxide and methane. These come from using gasoline for driving a car or coal for heating a building, for example. Clearing land and forests can also release carbon dioxide. Landfills for garbage are a major source of methane emissions. Energy, industry, transport, buildings, agriculture, and land use are among the main emitters.

Nowadays the ice is melting more rapidly, this can cause a rise in water/ocean. The forests are drying up faster, species populations are declining rapidly. So we must take action before it is too late.

Thank you.

stay safe

Answer:

Explanation:

Answer: Options #3: Tin and Hydrogen

Explanation:

Tin has 50 protons

Hydrogen has 1 proton

50 + 1 = 51 protons

♡ The Question/Task(s)! ♡

✦ || Which two elements, in looking at their atoms, have a total of 51 protons between them?

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♡ The Answer(s)! ♡

✦ || The answer is, "Tin and Hydrogen"!

I apologize in advance if the answer is incorrect! ♡

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♡ The Explanation(s)/Step-By-Step! ♡

✦ || If you combine each of the number of protons, Magnesium and Aluminum would contain 25 total! Magnesium consists of 12 protons, while Aluminum has 13. If you combine the number of protons for Lithium and Scandium, the result would be 24 total! Lithium contains 3 protons, while Scandium has 21. If you add the total number of protons between Magnesium, Aluminum, Lithium, and Scandium, the answer would be 49! If you combine the number of protons for Tin and Hydrogen, however, you would receive the total number of 51! Tin consists of 50 protons, while Hydrogen only has 1, therefore, the answer is Tin and Hydrogen!

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The mass of the solute is given by the moles and the molar mass of that substance. In the 2.50 M solution, 249 gm of KI is present.

Molarity and the volume of the solution can be used to give the moles of the solute dissolved in the solution and can be further used to give the mass of the solute.

Given,

Molarity of KI = 2.50M

Volume of potassium iodide solution = 0.6 L

Molar mass of KI = 166

The formula of molarity is given as:

Molarity = moles ÷ volume

The formula of moles is given as:

Moles = mass ÷ molar mass

Substituting moles into molarity as:

M = mass ÷ molar mass × Volume

mass = 2.50 × 0.6 × 166

= 249 gms

Therefore, 249 gms is the mass of KI.

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249 grams of potassium iodide (KI) should be used to prepare 0.600 of a 2.50 M solution of potassium iodide.

Molarity (M) is the amount of a substance in a certain volume of solution.

Molarity is defined as the moles of a solute per litres of a solution.

Molarity is also known as the molar concentration of a solution.

Given data:

Molarity of the solution = 2.50 M

Volume of solution = 0.600 L

Molarity =  [tex]\frac{Moles \;solute}{Volume \;of \;solution \;in \;litre}[/tex]

Now putting the value in the equation:

2.50 M =  [tex]\frac{Moles \;solute}{ 0.600 L}[/tex]

Moles of solute = 1.5

Moles  = [tex]\frac{mass}{molar \;mass}[/tex]

1.5  = [tex]\frac{mass}{166.0028 }[/tex]

Mass  = 249 gram.

Hence, 249 grams of potassium iodide (KI) should be used to prepare 0.600 of a 2.50 M solution of potassium iodide.

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