i am so bad at chemistry please help if u know..!

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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Answer

1.0 mol

Explanation

Given:

Volume, V = 5.0 L

Temperature, T = 215 K

Pressure, P = 342 kPa

The gas constant, R = 8.31 L kPa/mol K

What to find:

The number of moles of the gas sample.

Step-step-solution:

The number of moles of the gas can be determine using the ideal gas equation formula:

Put the given values into the formula and calculate for n:

The number of moles of the gas sample is 1.0 mol.

The solution with the highest concentration of hydronium ions is 0.050 M HCl.

Therefore option C is correct.

We will take a look at the strength of the acid and its molarity:

Hydrochloric acid (HCl) is a strong acid, which means it ionizes completely in water, releasing a high concentration of hydronium ions.

Acetic acid (\(HC_2H_3O_2\)) is a weak acid as it only partially ionizes in water, which causes  in a lower concentration of hydronium ions.

if we compare both solutions, then the solution with the highest concentration of hydronium ions would be the one with the highest molarity of the strong acid which is the HCl.

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Answer:

elements in the same period have the same number of shells

the period number the element is in, that is the number of shells it has.

Answer:

Its a small dense spherical structure in the nucleus of a cell during interphase.

1. A solute dissolves in a solvent to make a solution that describes a homogeneous mixture.

2. It has a single chemical composition property that describes a mixture.

1. A homogeneous mixture is a mixture in which the composition is uniform throughout the mixture. The saltwater described above is homogeneous because the dissolved salt is evenly distributed throughout the entire salt sample.

2. So, a mixture is made up of 2 or more different substances which are mixed but are not chemically combined. Also, the identities of each component are retained and the mixture can b separated into its components by physical means. So now alpha as a mixture does not have fix ratio of components, so it cannot be represented by a fixed formula. So hence we can conclude that hence d is the correct option, so that is, the mixture cannot be described by any chemical symbol or chemical formula.

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Answer:

a

Explanation:

The overall equation is \(C_2H_4 + H_2 ---- > C_2H_6\).

A chemical equation is defined as a symbolic representation of a chemical reaction in the form of symbols and formulas, in which reactant elements are given on the left and product units on the right.

For example,

\(NaOH+ HCl ---- > NaCl+ H_2O\)

In this, reactants are converted to products which is symbolized by a chemical equation. For example, iron (Fe) and sulfur (S) combine to form iron sulfide (FeS).

Fe(s) + S(s) → FeS(s)

here, the plus sign indicates that iron reacts with sulfur.

Thus, the overall equation is \(C_2H_4 + H_2 ---- > C_2H_6\).

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The expression below: K' = K²K' = 10²K' = 100 the value of the equilibrium constant for the reaction 2aa + 2bb ⇌ 2cc is 100.

What would be the value of the equilibrium constant for the reaction 2aa 2 bb d 2cc?

When the chemical reaction aa bb d cc attains equilibrium, it will follow the expression below:aa + bb ⇌ ccK = 10Now, the chemical equation for the reaction of 2aa 2 bb d 2cc is shown below:2aa + 2bb ⇌ 2ccK' = ?The equilibrium constant for the given chemical reaction can be determined using the following expression

:K' = [C]² / ([A]² x [B]²).

where:[A] = concentration of reactant aa[B] = concentration of reactant bb[C] = concentration of product cc Since the chemical reaction is 2aa + 2bb ⇌ 2cc, its equilibrium constant will be the square of the K value for the first chemical equation. This is shown in the expression below: K' = K²K' = 10²K' = 100

Therefore, the value of the equilibrium constant for the reaction 2aa + 2bb ⇌ 2cc is 100.

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Answer:

25lb 567.m

Explanation:

Answer:

force had thrown the object with more

Answer:

If an object is in motion and more force is applied to it, the object will begin moving faster

Explanation:

don't have any (sorry:[ )

A buffer solution is a solution that can resist changes in pH when small amounts of acid or base are added to it. The pH of a buffer solution depends on the ratio of its conjugate acid and base. When a small amount of acid is added to a buffer solution, the buffer reacts with it to neutralize it, maintaining the pH of the solution.

Therefore, a reasonable value of buffer pH after the addition of a small amount of acid would be one that is close to the original pH of the buffer solution. The pH values of 4.80, 6.00, and 5.00 are all reasonable values for a buffer solution after the addition of a small amount of acid, depending on the specific buffer system being used. The pH value of 3.80, however, is not a reasonable value for a buffer solution after the addition of a small amount of acid as it would indicate that the buffer was not able to resist the change in pH caused by the added acid.

In summary, the pH value of a buffer solution after the addition of a small amount of acid will depend on the specific buffer system being used, but it should be a value that is close to the original pH of the buffer solution. A pH value of 3.80 would not be a reasonable value as it would indicate that the buffer was not effective in resisting the change in pH caused by the added acid.

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Considering the definition of atomic mass, isotopes and atomic mass of an element, the average atomic mass of the element is 68.636.

The atomic mass of an atom is equal to the sum total of protons and neutrons in the nucleus.

Isotopes are atoms whose atomic nuclei have the same number of protons but a different number of neutrons. This is, the atomic numbers are the same, but the number of neutrons is different.

The atomic masses of chemical elements are usually calculated as the weighted average of the masses of the different isotopes of each element, taking into account the relative abundance of each of them.

In this case, you know:

The average mass of the element is calculated as:

average mass=  68 ×0.565 + 69 ×0.234 + 70 ×0.201

average mass= 68.636

Finally, the atomic mass of the element is 68.636.

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Answer:

Fossil fuels cause local pollution where they are produced and used, and their ongoing use is causing lasting harm to the climate of our entire planet. Nonetheless, meaningfully changing our ways has been very difficult.

Answer:

theirs nothing there?!!!??!?!?!??!!?!?!?!?!??!?!??!?!?!??!?!

Explanation:

whys it just a blank picture

The na ion concentration in the solution formed by mixing 20. ml of 0.10m na2so4 solution with 50. ml of 0.30m na3po4 solution is 0.18M

The na ion concentration in the solution formed by mixing 20. ml of 0.10m na2so4 solution with 50. ml of 0.30m na3po4 solution is

The following are the dissociation reactions:

NaCl⇋Na+Cl−Na2SO4⇋2Na+SO42

[Na] is the expression for the mixture's molarity.+]

mix=V1+V2M1V1+M2V2

When values are substituted in the expression above, we obtain

[Na+]mix=30+70

0.10×30+0.30×50=0.18M

The na ion concentration in the solution formed by mixing 20. ml of 0.10m na2so4 solution with 50. ml of 0.30m na3po4 solution is 0.18M

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Answer:

um i think 20

Explanation: because 20

There are 1.31 x 1022 bromide ions in 2.00 g of \(MgBr_2\).

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The number of mole present in 87 grams of potassium bromide, KBr is 0.731 mole

We'll begin our calculation by obtaining the molar mass of potassium bromide, KBr. Details below:

Molar mass of potassium bromide, KBr = K + Br

Molar mass of potassium bromide, KBr = 39 + 80

Molar mass of potassium bromide, KBr = 119 g/ mol

Finally, we shall determine the number of mole present. Details below:

Mole = mass / molar mass

Mole of potassium bromide, KBr = 87/ 119

Mole of potassium bromide, KBr = 0.731 mole

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Complete question:

How many moles are in 87g of potassium bromide?

Answer:

Tropical rainforests can be found in Central and South America, western and central Africa, western India, Southeast Asia, the island of New Guinea, and Australia.

Explanation:

Answer:

They are found just above and just below the equator in tropic zones. In these areas, the sunlight is very strong.

Explanation:

To increase the percent yield of the reaction N2(g) + 3H2(g) ⇌ 2NH3(g), you can employ several measures:

1. Adjusting the reaction conditions: Increasing the pressure or decreasing the volume of the system can shift the equilibrium towards the product side, as per Le Chatelier's principle. This would lead to an increase in the percent yield of NH3.

2. Modifying the temperature: Lowering the temperature can favor the formation of NH3, as the forward reaction is exothermic. This adjustment can help increase the percent yield.

3. Using a catalyst: Adding a suitable catalyst can speed up the reaction rate without being consumed in the process. This allows the reaction to reach equilibrium faster, potentially leading to a higher percent yield of NH3.

4. Altering the stoichiometry: Adjusting the initial amounts of reactants can also impact the percent yield. Increasing the concentration of N2 or H2 relative to NH3 can push the equilibrium towards the product side, resulting in a higher percent yield.

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The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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For each given acid we have to determine whether it is a strong acid or weak acid,

a. The acid "HNO₃" is a - Strong acid

b. The acid "HCl" is - Strong acid

c. The acid "HBr" is - Strong acid

d. The acid "H₂SO₄" is - Weak acid

(Expression for acid ionization constant: Ka = [H⁺][HSO⁴⁻]/[H₂SO₄])

In the given list of acids:

a. HNO₃ is a strong acid because it completely dissociates in water to produce H⁺ ions and NO³⁻ ions.

b. HCl is a strong acid because it fully dissociates in water to form H⁺ ions and Cl⁻ ions.

c. HBr is a strong acid as it ionizes completely in water to produce H⁺ ions and Br⁻ ions.

d. H₂SO₄ is a weak acid as it only partially dissociates in water, resulting in the presence of both undissociated H₂SO₄ molecules and H+ ions.
The expression for the acid ionization constant (Ka) is given as [H+][HSO⁴⁻ ]/[H2SO4], where [H⁺], [HSO⁴⁻], and [H₂SO₄] represent the concentrations of the respective species in the equilibrium equation.

The classification of acids as strong or weak depends on their ability to ionize in water.

Strong acids fully dissociate, producing a high concentration of H+ ions, while weak acids only partially dissociate, resulting in a lower concentration of H+ ions.

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Answer:

Matter is made up of particles that are in constant motion and have energy

Explanation:

Answer:

Gravity.

Explanation:

In science, matter can be defined as anything that has mass and occupies space. Any physical object that is found on earth is typically composed of matter. Matter are known to be made up of atoms and as a result has the property of existing in states.

Generally, matter exists in three (3) distinct or classical phases and these are;

1. Solid: it is the state of matter in which the physical substance has a definite shape and fixed volume but not compressible. Examples of solids are pen, screwdriver, television, car etc.

2. Liquid: it is the state of matter in which the physical substance can be poured and it takes the shape of its container. Also, liquids generally have a definite volume. Examples of liquids are urine, water, milk, blood etc.

3. Gas: it is the state of matter in which the physical substance has no definite shape or volume and as a result fills all available space. Also, gases are easily compressible and can flow. Examples of gases are hydrogen, oxygen, argon, nitrogen etc.

The attraction between all objects that have matter is generally referred to as gravity.

Generally, this force of attraction (gravity) attracts an object (body) towards another having mass, or towards the center of a planetary body such as earth.

Side product which is obtained during the dehydration of cyclohexanol  which is a organic type of chemical reaction is dicyclohexyl ether .

Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.

There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

There are three types of chemical reactions:

1) inorganic reactions

2)organic reactions

3) biochemical reactions

During chemical reactions atoms are rearranged and reactions are accompanied by an energy change as new substances are formed.

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Answer:

0.250 kg

2500 g

Explanation:

1 kg = 1000g

1g = 10 mg

The claim that vinyl gloves have a higher leak rate than latex gloves is supported by the study at a significance level of 0.005.

To determine if vinyl gloves have a higher leak rate than latex gloves, we can conduct a hypothesis test.

The z-value is calculated as:

z = (p₁ - p₂) / √((p₁(1 - p₁) / n₁) + (p₂(1 - p₂) / n₂))

where p₁ and p₂ are the sample proportions, and n₁ and n₂ are the sample sizes.

Certainly! Let's calculate the z-value to determine if vinyl gloves have a higher leak rate than latex gloves.

For vinyl gloves:

Sample size (n₁) = 240

Leaking gloves (x₁) = 0.63 * 240 = 151.2 (approximated to 151)

For latex gloves:

Sample size (n₂) = 240

Leaking gloves (x₂) = 0.07 * 240 = 16.8 (approximated to 17)

We will calculate the z-value using the formula:

z = (p₁ - p₂) / √((p₁(1 - p₁) / n₁) + (p₂(1 - p₂) / n₂))

where p₁ and p₂ are the sample proportions.

p₁ = x₁ / n₁ = 151 / 240 ≈ 0.629

p₂ = x₂ / n₂ = 17 / 240 ≈ 0.071

Calculating the z-value:

z = (0.629 - 0.071) / √((0.629 * (1 - 0.629) / 240) + (0.071 * (1 - 0.071) / 240))

z ≈ 13.239

The calculated z-value is approximately 13.239. To determine if the claim is supported, we compare this value to the critical z-value for a one-tailed test at a significance level of 0.005.

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Dipole-dipole interactions now exist between the water molecules as bonding or interactions. This existing dipole-dipole interaction between the water molecules is disturbed when NaCl solutes are dissolved in water.

Solute-Solute interactions: Since NaCl is an ionic compound, the solute-solute interaction is a bond between the molecules of the solute. This interaction is called the ion-ion (NA+Cl-) interaction. The water molecules tend to destroy this ion-ion connection of NaCl when it is dissolved in water.

NaCl dissociates as a result of interactions between the solute and the solvent. The ion-ion contact of NaCl is broken when it dissolves in water, and the molecules of the solvent then interact with the molecules of the solute. These interactions result in interactions between Na+ and O- .

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