(iii) Observe the following diagram and answer the following questions :
X Х
Y
(A) Identify elements X and Y.
(B) Do these elements belong to the same group?
(C) Which element is more electropositive in nature? Why?​

Answer:

The most basic answer to this is that the mitochondria generates energy for the cell's power needs.

But... (elaborated in explanation.)

Explanation:

As you may know, the mitochondria is the powerhouse of cells.

The mitochondria can ALSO identify cell death, and determine which cells (dead) must be destroyed.

The mitochondria helps regulate calcium storage, but quickly absorbing calcium ions until needed.

And lastly, the mitochondria can also help generate heat. A process called proton leak. This is known as non-shivering thermogenesis.

The element should be placed in the column for metalloids. Option A

We know that the properties of metals can be used to identify an unknown substances as a metal. We know that metals are able to react with acids to liberate the metal salt and hydrogen gas. Metals do not react with bases because they can not accept electrons.

Metalloids are generally amphoteric in nature. They can react with both the acid and the basses to form compounds. The nonmetals do not react with acid or base.

Looking at the result, we are told that the entry in the second row have the entries  nothing, nothing, nothing. If this is the outcome, then it follows that the element should be placed in the column for metalloids.

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Answer: A

Explanation:

Answer:

hydrochloride acidic maby

Explanation:

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A positive correlation does not necessarily indicate a causal link, and a negative correlation does not necessarily indicate a causal link. Option A

In research, correlation often indicates that some kind of relationship does exist between the variables. This does not actually mean causation. The correlation could be positive or negative.

It should be known that; a positive correlation does not necessarily indicate a causal link, and a negative correlation does not necessarily indicate a causal link. Option A

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The formula of the compound will be  [tex]Mg_2Ga[/tex]

The compound contains magnesium and gallium. The symbol and magnesium and gallium is Mg and Ga respectively.

Magnesium content is 41.1%

Gallium content is 58.9%

First, find the number of moles of each element in the compound by dividing their percentage compositions with their respective molar weights.

Mg = 41.1/24.505 =1.6772

Ga = 58.9/69.723 = 0.8448

Next, divide each number of moles by the smallest number of moles.

Mg = 1.6772/0.8448 = 2

Ga = 0.8448/0.8448 = 1

Thus, the formula of the compound is [tex]Mg_2Ga[/tex]

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Answer:

8.72×10^5

Explanation:

Answered it in the comments! ^^

Based on the the US Environmental Protection Agency guidelines, the maximum allowable concentration of lead in drinking water, yearly intake of lead by the individual = 8.21 mg.

I would not willingly drink the water due to the risk of lead poisoning.

Based on the US Environmental Protection Agency guidelines, the maximum allowable concentration of lead in drinking water is 0.015 mg/L.

a)Given daily average intake of water is 1.5, in one year;

Volume of water intake = 1.5 * 365 = 547.5 L

Yearly intake of lead by the individual = 0.015 mg/L * 547.5

Yearly intake of lead by the individual = 8.21 mg

b) I would not willingly drink the water due to the risk of lead poisoning.

In conclusion, safe, drinking water should be free on contaminants such as lead to avoid lead poisoning.

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Answer: 2.52 M

Explanation:

The product of molarity (moles/litre) and volume in litres yields moles, and the numbers of moles in two solutions means dilute and concentrated are equal, which is expressed by the following equation: 

[tex]M_1V_1=M_2V_2[/tex]

[tex]$$Given that\\M $1=12.0 \mathrm{M}$ or mole $/ \mathrm{L}$\\$\mathrm{V} 1=420 \mathrm{ml}$\\$\mathrm{M} 2=$ ?\\$\mathrm{V} 2=2.0 \mathrm{~L}$ or $2000 \mathrm{ml}$\\\\$\mathrm{M} 1 \mathrm{~V} 1=\mathrm{M} 2 \mathrm{~V} 2$\\$\mathrm{M} 2=\mathrm{M} 1 \mathrm{~V} 1 / \mathrm{V} 2$\\$=12.0 * 420 / 2000$\\$=2.52 \ \mathrm{M}$[/tex]

The combustion of 30.0 g of glucose at room temperature and pressure produces 24.0 L of carbon dioxide.

It is a reaction in which a substance burns with oxygen to form carbon dioxide and water.

Let's consider the combustion of glucose.

C₆H₁₂O₆ + 6 O₂ ⇒ 6 CO₂ + 6 H₂O

First, let's convert 30.0 g of glucose to moles using its molar mass.

30.0 g × 1 mol/180.16 g = 0.167 mol

The molar ratio of C₆H₁₂O₆ to CO₂ is 1:6. The moles of carbon dioxide produced are:

0.167 mol Glucose × (6 mol CO₂/1 mol Glucose) = 1.00 mol CO₂

1 mol of an ideal gas at room temperature and pressure occupies 24.0 L.

The combustion of 30.0 g of glucose at room temperature and pressure produces 24.0 L of carbon dioxide.

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When you are taking a test, you are awake and alert, which means that your brain is currently generating beta waves (Option b).

The beta waves are a special type of brain waves observed by using electromagnetic devices (especially in physiology).

This type of waves are dominant during conscious thought as well as during cognitive logical thinking processes.

In conclusion, when you are taking a test, you are awake and alert, which means that your brain is currently generating beta waves (Option b).

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Answer:

Sarif should wear protective gloves, protective clothing.

Explanation:

The complete equation to following equation to make a double replacement reaction is: Na2SO4 + BaCl2 = BaSO4 + 2NaCl.

A double displacement reaction is the reaction that involves the replacement of two elements.

According to this question, barium sulfate (BaSO4) and sodium chloride are produced from the chemical equation given.

This clearly suggests that Sodium sulfate is the missing reactant, hence, the complete equation to following equation to make a double replacement reaction is:

Na2SO4 + BaCl2 = BaSO4 + 2NaCl.

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Pollutants moving into underground water does not represent a social benefit of sustainable waste management.

It is the act of recycling wastes or reducing the amount of single-use products that end up as wastes in the environment.

By practicing sustainable waste management, fewer wastes are generated and lesser lands are used as landfills.

More lands become available and wastes are put to beneficial uses.

Pollutants moving into underground water is detrimental to the health of humans. Thus, it cannot represents one of the social benefits of sustainable waste management.

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The option that does not show the social benefit of sustainable waste management is leacha-te going into ground-water (Option D).

The term sustainable waste management has to do with the process in which pollutants are taken care of in a way that does not affect the environment.

The option that does not show the social benefit of sustainable waste management is leacha-te going into ground-water (Option D).

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The factor which will not determines if two molecules will bind according to collision theory is the direction the molecules are facing

Collision theory is a theory which describes of predicting the rate at which chemical reactions occurs between atoms and molecules of elements.

So therefore, the factor which will not determines if two molecules will bind according to collision theory is the direction the molecules are facing

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Answer:

Percent Yield  =  21.4% C

Explanation:

The actual yield is the value that was produced after conducting an experiment. The theoretical yield is the value calculated using the balanced chemical equation.

To find the percent yield, you need to (1) convert moles A to moles C (via the mole-to-mole ratio from equation coefficients) and then (2) calculate the percent yield. It is important to arrange the ratios in a way that allows for the cancellation of units. The final answer should have 3 sig figs to match the sig figs of the values given.

3 A + B -----> 2 C + D
^                    ^

7.00 moles A          2 moles C
---------------------  x  ----------------------  =  4.67 moles C
                                 3 moles A

                                 Actual Yield
Percent Yield  =  ------------------------------  x  100%
                              Theoretical Yield

                              1.00 moles C
Percent Yield  =  -------------------------  x  100%
                              4.67 moles C

Percent Yield  =  21.4% C

In the subgranular zone

Thyroid hormone contains the mineral iodine (option I). Details about thyroid hormone can be found below.

Thyroid hormone is the hormone produced by the thyroid gland of the body, which is a large butterfly-shaped endocrine gland situated on the front of the neck that produces various hormones.

The thyroid hormone is responsible for regulating metabolism, which controls the amount of calories burnt in a day.

One of the major minerals found in the thyroid is iodine. The thyroid gland absorbs iodine from the bloodstream, and then stores it to aid in the production of thyroid hormones.

Therefore, the thyroid hormone contains the mineral iodine.

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[tex]oxidation \: number \: of \: oxygen = \\ before \: rxn = - 2 \\ after \: rxn = - 2[/tex]

[tex]oxidation \: number \: of \: hydrogen = \\ before \: rxn = + 1 \\ after \: rxn = \\ 2x - 2 = 0 \\ x = + 1[/tex]

[tex]oxidation \: number \: of \: carbon = \\ before \: rxn = \\ x - 6 = - 2 \\ x = 4 \\ after \: rxn = \\ x - 4 = 0 \\ x = 4[/tex]

[tex]oxidation \: numbers \: remain \: constant \\ so \: none \:a re \: undergoing \: oxidation \: \\ nor \: reduction \: [/tex]

Answer:

D

Explanation:

I believe that is the answer

Answer:

B) Gold

A) Number of electrons and protons.

Explanation:

Atomic Masses (from periodic table):

----> Copper (Cu): 63.546 g/mol

----> Gold (Au): 196.97 g/mol

----> Iron (Fe): 55.845 g/mol

----> Platinum (Pt): 195.08 g/mol

The atomic number represents the number of protons. Neutral atoms have the same number of protons as electrons. The mass number represents the number of protons and neutrons.

Explanation:

1. The gaseous exchange in the lungs occurs in the alveoli. They are tiny air sacs at the end of the bronchioles (tiny branches of air tubes in the lungs). The alveoli are where the lungs and the blood exchange oxygen and carbon dioxide during the process of breathing in and breathing out.

The mass of carbon in 1 liter of mixture = 1.108 g

The mass of carbon in 1 liter of the mixture is determined as follows:

First the moles of gas is determined using the ideal gas formula:

n = (1 * 1)/(0.08205L * 298)

n = 0.0409 mole of total gas

mass of gas is then determined using the formula:

mass = 1 * 1.375

mass = 1.375 g

Let x = mass of CH₄ and y = mass of C₄H₁₀

x + y = 1.375 g

nCH₄ + nC₄H₁₀ = ntotat

moles = mass/molar mass

x + y = 1.695 => y = 1.695 - x

(x/molar mass of CH₄) + [(1.375 - x)/ molar mass C₄H₁₀ = 0.0409

x/16 + (1.375 - x)/58 = 0.0409

x = 0.380 g CH₄

y = 1.375 - 0.380

y = 0.995 g of C₄H₁₀

mass of C in CH₄ = 12/16 * 0.380 = 0.285

mass of C in C₄H₁₀ = 48/58 * 0.995 = 0.823

Mass of carbon in 1 liter of mixture = 0.285 + 0.823

Mass of carbon in 1 liter of mixture = 1.108 g

In conclusion, the carbon is the major component in the mixture.

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The compound that is formed is calcium hydroxide.

When limestone is decomposed at a high temperature, calcium oxide is formed as the residue.

[tex]CaCO_3 --- > CaO + CO_2[/tex]

When the calcium oxide residue is treated with water, a calcium hydroxide solution is formed.

[tex]CaO + H_2O -- > Ca(OH)_2[/tex]

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The type of plant should be ginkgo.

Ginkgo biloba is a popular herbal supplement used to improve memory and prevent dementia, presumably due to its antioxidant properties or anti-amyloid aggregation effects.

Dementia is a term used to describe when a person's loss of certain behavioral abilities, such as remembering, thinking, and reasoning, interferes with their daily activities and life.

Dementia occurs when neurons in the brain stop functioning, lose their ability to communicate with other cells in the brain, and die. When people develop dementia, they may have problems with a variety of cognitive functions.

Aside from its decorative aspects, ginkgo biloba is a medical herb with numerous benefits. The tree is frequently used to treat a variety of ailments, including:

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In sharp contrast to elimination reactions, addition reactions are generally favored at low temperature, because enthalpy term is more likely to be negative at such temperatures.

An addition reaction is an organic reaction occur when two or more molecules combine to form a larger molecule without the loss of any atoms present in reactant. Addition reaction is favored at low temperature.

Elimination reaction is a type of organic reaction where many atoms either in groups or pairs are removed from a molecule. Elimination reaction is favored at high temperature.

Thus from the above conclusion we can say that In sharp contrast to elimination reactions, addition reactions are generally favored at low temperature, because enthalpy term is more likely to be negative at such temperatures.

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strength in milligrams is 0.3mg

Mass of the solute in grams/Volume of the solution in litres equals the strength of the solution. The overall formula must be multiplied by 1000 if the volume is measured in millilitres (mL). The concentration of the solution, measured in grammes per litre, can be used to determine the solution's strength.

Molarity -  The moles of solute per litre of solution is measured as molarity. For instance, when table salt is dissolved in water, water serves as both the solution and the solute. Sodium chloride weights 58.44 grammes per mole. One molar solution, or 1M, is created by dissolving 58.44 grammes of sodium chloride in one litre of water.

Relation between Molarity and Strength?

The volume of solute in one litre of a solution determines its strength. As a result, a solution's strength is calculated by multiplying its molecular mass by its molarity.

1 grain = 64.8 milligrams.

1/200 grains = 64.8/200

                     = 0.3mg

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The molecule obeying the octet rule is option (D) O3.

According to the octet rule, an atom's outer shell or orbit needs to contain eight electrons for the molecule to be stable. Knowing the number of valence electrons in a molecule is made easier by Lewis structure. The electrons involved in bond-forming and non-bonding electron pairs are known as valence electrons.

Each oxygen molecule in ozone or O3 has six valence electrons.Due to the presence of three oxygen molecules, there are a total of 18 valence electrons (6*3=18). Therefore, the Ozone molecule has a total of 18 valence electrons accessible.

Therefore,The molecule obeying the octet rule is option (D) O3.

The resonance structure of O3 is given below;

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Hard-boiled eggs are made by placing eggs in boiling water until their whites and yolks solidify. Hard-boiling an egg take longer at high altitude than at sea level because the high altitude lowers the boiling point of the egg.

Hard-boiling an egg take longer at high altitude than at sea level because the high altitude lowers the boiling point of the egg. It takes longer for the water to reach 100°C.

Hard boiling egg is a chemical change because the egg cannot back into its original form.

Chemical change are those changes in which substance changes chemical composition. These changes are permanent changes.

Thus from the above conclusion we can say that Hard-boiled eggs are made by placing eggs in boiling water until their whites and yolks solidify. Hard-boiling an egg take longer at high altitude than at sea level because the high altitude lowers the boiling point of the egg.

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The standard temperature and pressure conditions enthalpy is usually measured under are 1kPa and 273K (option A).

Enthalpy in thermodynamics is a measure of the heat content of a chemical or physical system.

Enthalpy is the sum of the internal energy and pressure times volume It can be calculated using the following formula:

H = E + P V

Where;

H = Enthalpy

E = internal energy

P = pressure

V = volume

However, the enthalpy of a substance is usually measured under standard temperature and pressure.

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