If repeated measurements agree closely but differ widely from accepted value these measurements are?

A. when the volume of the gas is halved, the pressure of the gas will be doubled.

PV = nRT

P = nRT/V

when the volume is halved

P= nRT/0.5V

P = 2nRT/V

P(new) = 2P(initial)

Thus, when the volume of the gas is halved, the pressure of the gas will be doubled.

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Answer:

5.0 x 10^-7

Explanation:

[H+]=10^-6.3

Answer:

The theory of plate tectonics explains how continental movements could occur

Explanation:

Answer:

The theory of plate tectonics does not explain how continental movements could occur.

Explanation:

Explanation:

The answer is mentioned above.

Hope it helps.

I feel like it's C. or D. but I guess it's C.

Answer: Heyaa! ~

A constant in an investigation is a quantity

that does not change...

Hopefully this helps you! ^^

The statement "ΔS for the reaction CaCO3(s) => CaO(s) + CO2(g) is negative" is false.

The ΔS (change in entropy) for a reaction can be determined by considering the number of gas molecules and the degree of freedom in the system. In the given reaction, CaCO3(s) decomposes into CaO(s) and CO2(g). Let's analyze the entropy changes for each component involved.

CaCO3(s) (solid) → The entropy of a solid is generally lower compared to a gas or liquid. Thus, the entropy change for the solid CaCO3 is expected to be relatively low.

CaO(s) (solid) → Similarly, the entropy of a solid is relatively low. The formation of solid CaO does not contribute significantly to the entropy change.

CO2(g) (gas) → Gaseous molecules have higher entropy compared to solids. The formation of CO2 gas results in an increase in entropy.

Overall, the reaction involves the conversion of a solid and the formation of a gas. Since the formation of CO2(g) contributes to a significant increase in entropy, the overall ΔS for the reaction is expected to be positive, not negative.

The statement "ΔS for the reaction CaCO3(s) => CaO(s) + CO2(g) is negative" is false. Based on the analysis of entropy changes, the reaction is more likely to have a positive ΔS value.

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Answer:

22 L OF WATER VAPOR WILL BE PRODUCED AT STP IF 5.5 L OF PROPANE WERE BURNED.

Explanation:

Balanced Equation for the reaction:

C3H8(g) + 5O2(g) -------> 3CO2(g) + 4H2O(g)

From the reaction;

1 mole of propane gas reacts with 5 moles of oxygen gas to form 4 moles of water vapor.

At STP, 1 mole of a gas occupies 22.4 dm^3 of the gas

So therefore, 22.4 dm^3 of propane reacts with oxygen to produce 4 * 22.4 dm^3 of water vapor.

22.4 dm^3 of propane = 89.6 dm^3 of water vapor

If 5.5 L of propane were to be burned, how many litres of water would be produced?

22.4 L of propane produces 89.6 L of water

5.5 L of propane will produce ( 5.5 L * 89.6 L/ 22.4 L) L of water vapor

5.5 L of propane will produce 492.8 / 22.4 L of water vapor

5.5 L of propane will produce 22 L of water vapor.

So at the end of the reaction of 5.5 L of propane, 22 L of water vapor will be given off.

The mineral presented in the image has a metallic luster. It is opaque, which means that it is not clear and light does not pass through it. It also has cleavage, which refers to the tendency of a mineral to break along planes of weakness.

The cleavage is evident in the image, as the mineral appears to have flat, smooth surfaces that intersect at sharp angles when it is broken or fractured.Cleavage is one of the most important properties of a mineral because it provides information about the way in which the mineral will break when subjected to external forces.

A mineral with good cleavage will break into pieces that have a smooth, flat surface, while a mineral with poor cleavage will break into pieces that have an uneven surface. This property is often used by mineralogists to help identify minerals since it is unique to each mineral.

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The mineral’s luster, opacity, and cleavage define its properties. Metallic luster means it reflects light like metal, opacity implies no light passes through it, and cleavage speaks to how it breaks.

In order to determine the characteristics of a mineral, we assess attributes such as the mineral's luster, opacity, and cleavage. The metallic luster refers to how light interacts with the surface of a mineral, metallic luster means the mineral reflects light as a polished metal would.

When a mineral is opaque, it means that light does not pass through it at all - it is not transparent or translucent. Lastly, a mineral's cleavage refers to how it breaks or fractures along distinctive planes. To accurately describe the mineral in the image, these three characteristics would need to be observable.

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The relationship between latent heat and water is that latent heat is the temperature required to change water into any of its other states.

Latent heat is the heat that is released or absorbed accompanying a change of state or of phase without changing its temperature.

The latent heat that involves melting a solid or freezing a liquid is called the latent heat of fusion while the one involved with vaporizing a liquid or a solid or condensing a vapour is called the latent heat of vaporization.

Water has a relatively high specific heat, hence, it takes more energy to increase the temperature of water compared to other substances.

Examples of latent heat involving water are as follows:

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The system adjust to reestablish equilibrium at D. The reaction shifts to the right products and the concentration of HI increases.

When \(H_{2}\) gas is added to the system at equilibrium, Le Chatelier's principle states that the system will respond by shifting the equilibrium position in the direction that consumes or reduces the excess reactant. In this case, the excess \(H_{2}\) gas is consumed to reestablish equilibrium.

Since the reaction is written in the forward direction, an increase in the concentration of \(H_{2}\) gas will drive the reaction towards the product side, leading to an increase in the concentration of HI gas. At the same time, the concentrations of \(H_{2}\) and \(I_{2}\) gases will decrease as they are consumed in the forward reaction.

Therefore, the system will adjust by shifting to the right, favoring the formation of HI gas and increasing its concentration, while decreasing the concentrations of \(H_{2}\) and \(I_{2}\) gases. This shift helps to reestablish equilibrium in the system. Therefore, Option D is correct.

The question was incomplete. find the full content below:

\(H_{2}\) gas is added to the system at

equilibrium below. How does the

system adjust to reestablish

equilibrium?

51.8kJ + H_{2}(g) +l 2 (g)

A. The reaction shifts to the left reactants and the concentration of HI increases

B. The reaction shifts to the right products and the concentrations of \(H_{2}\) and \(I_{2}\) increase

C. The reaction shifts to the left reactants and the concentration of \(H_{2}\) and \(I_{2}\) increase

D. The reaction shifts to the right products and the concentration of HI increases

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Formic acid (ch2o2)  on reaction with water undergoes dissociation reaction.

Formic acid  is the acid released by ant when it bites which causes us irritation.

It's formula is CH2O2 or HCOOH. and pH is 3.75.

In the case of dehydration, one hydrogen atom in the water molecule joins the hydroxyl group in the trans formic acid to form a new water molecule, while the hydrogen bonded to carbon in the acid breaks off to regenerate a water molecule.

Formic acid dissociates in water according to the equation:

HCOOH (aq) + H2O (l) = H3O + (aq) + HCOO- (aq)

Formic acid is the simplest carboxylic acid, containing a single carbon. Occurs naturally in various sources including the venom of bee and ant stings, and is a useful organic synthetic reagent. Principally used as a preservative and antibacterial agent in livestock feed.

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Answer:

Explanations:

The formula for calculating the amount of carbohydrate in the potato is expressed as:

Given the following parameters:

Mass of CHO = 20 g

caloric value = 4kcal/g

Substitute the parameters into the formula

amount of kcal = 20g * 4kcal/g

amount of kcal obtained = 80kcal

Hence the amount of kcal obtained from the carbohydrate in the potato is 80kcal

Dissolve a sugar cube in water and you still have sucrose, not oxygen, carbon, and hydrogen. This does not mean that sucrose or water cannot be broken down into simpler substances.

But methods must involve a chemical change.

The change in which the molecular composition is completely altered and a new product is formed is called a chemical change.

Chemical changes create a new product.

The changes in chemical change are irreversible and permanent.

A chemical change occurs when the substance's composition is changed. When bonds are broken and new ones are formed a chemical change occurs.

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Methionine is always the first one to be incorporated into a newly made protein followed by identification of the only start codon on mRNA.

Amino acids are transferred by initiator tRNAs to the mRNA strand by the process of translation. Each tRNA has an anticodon, which is a group of three nucleotides that pairs with an appropriate mRNA codon to form a stable bond. The amino acid that the codon specifies is carried by the opposite end of the tRNA. AUG is one codon that serves as a "start" signal to initiate translation (it also specifies the amino acid methionine).

All newly created proteins have methionine as the first amino acid at their N-terminal end, the end of a protein that is synthesised initially, because the initiator tRNA always carries this amino acid (in bacteria, a modified version of methionine called formylmethionine is employed).

Transfer RNAs, or tRNAs, are molecules that read an mRNA's codons sequentially (from the 5' end to the 3' end) during translation.

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Answer:

[N2] = 0.3633M

[H2] = 1.090M

[NH3] = 0.2734M

Explanation:

Based on the reaction of the problem, Kc is defined as:

Kc = 0.159 = [NH3]² / [N2] [H2]³

Where [] are the equilibrium concentrations.

The initial concentrations of the reactants is:

N2 = 1.00mol / 2.00L = 0.500M

H2 = 3.00mol / 2.00L = 1.50M

When the equilibrium is reached, the concentrations are:

[N2] = 0.500M - X

[H2] = 1.50M - 3X

[NH3] = 2X

Where X is reaction quotient

Replacing in the Kc equation:

0.159 = [2X]² / [0.500 - X] [1.50 - 3X]³

0.159 = 4X² / 1.6875 - 13.5 X + 40.5 X² - 54 X³ + 27 X⁴

0.268313 - 2.1465 X + 6.4395 X² - 8.586 X³ + 4.293 X⁴ = 4X²

0.268313 - 2.1465 X + 2.4395 X² - 8.586 X³ + 4.293 X⁴ = 0

Solving for X:

X = 0.1367. Right solution.

X = 1.8286. False solution. Produce negative concentrations

Replacing:

[N2] = 0.500M - 0.1367M

[H2] = 1.50M - 3*0.1367M

[NH3] = 2*0.1367M

The equilibrium concentrations are:

Answer: 20 g

Explanation: heat received Q = m c dT

Q= 50J , dT= 25 C anc c= 0.10 J / g C

And m = Q / c dT

The mass of the iron sample that received the heat is determined as 20 g.

The mass of the iron sample is calculated as follows;

Q = mcΔT

where;

m = Q/cΔT

m = (50) / (0.1 x 25)

m = 20 g

Thus, the mass of the iron sample that received the heat is determined as 20 g.

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Answer:

they are seed producing so can populate more areas

Answer:

In the backrest use materials where it is easy to clean and where they do not absorb fluids, in this way it would be cooler, such as an ecological leather simulator.

And in the armrest as well, but in both areas we must not rule out that if or if it should have even a minimum of padded surface so that the patient or the person who spends most of the day in the wheelchair does not suffer from joint pain.

Explanation:

Some wheelchair factories also implement modern chairs where they are made of stainless steel structures lined with padded material with perforated fabrics that allow breathing and aeration of body areas that have contact with the fabric.

There are two properties that can be used to identify an element: the atomic number or the number of protons in an atom. The number of neutrons and number of electrons are frequently equal to the number of protons, but can vary depending on the atom in question.

Answer:

Changing the shape of the molecules that create fragrances in a flower or fruit may influence our perception of their smell. The reaction pattern produced, olfactory code, is sent as a signal to the brain, which which is how you smell things.

Explanation:

Changing the structure of the molecules that form perfumes in a flower or fruit may have an impact on how we perceive their scent. The olfactory code, or response pattern, is delivered to the mind as a message, and that's how you smell things.

When a material releases particles into the air, it produces a scent. Those molecules must enter our nose in order for us to notice the smell. The stronger the scent, the more unstable the material.

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Cyclic constitutional isomers refer to isomers that differ in the arrangement of atoms in a cyclic molecule. In cis-1-chloro-2-methylcyclobutane, the chlorine atom and the methyl group are attached to the same carbon atom of the cyclobutane ring. The two cyclic constitutional isomers can be obtained by interchanging the positions of the chlorine and the methyl group.

Both isomers have the same ring size of 4 carbons. However, the positions of the chlorine atom and the methyl group in the ring differ between the two isomers. The name of each isomer reflects the location of the substituents on the ring.

In isomer A, the methyl group is attached to the first carbon atom of the ring and the chlorine atom is attached to the second carbon atom. In isomer B, the positions of the two substituents are reversed. Therefore, these two isomers are constitutional isomers, meaning that they have the same molecular formula but different connectivity of atoms.

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When we have an acid-base reaction, the acid will be that substance that donates protons, in the form of H+ ions. The base will be the one that accepts the H+ ions. Now, the base that accepts the protons becomes a potential proton donor, thus becoming a conjugate acid. This is the case with H3O+.

H2O accepts H+ ions, so it is a base and when it becomes H3O+ it becomes a potential H+ proton donor, that is, a conjugate acid.

so, the answer will be B. Conjugate acid

A separation process that depends on differing abilities of substances to form gases is called Distillation.

Distillation is a common method used to separate and purify liquids based on their different boiling points. The process involves heating a mixture of liquids to a temperature where one liquid will evaporate and form a vapor, while the other liquids will remain in a liquid state. The vapor is then condensed back into a liquid form and collected, which is then called the distillate. The distillate will be the liquid with the lowest boiling point of all the components in the mixture. This process can be repeated for different boiling point ranges and those multiple distillates will be different components of the original mixture.

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Answer:

The balanced chemical equation shows that 4 moles of ammonia react with 5 moles of oxygen. You have 4.6 moles of oxygen, which is more than what is needed to react with 4 moles of ammonia. Therefore, the limiting reactant is ammonia. You can use stoichiometry to calculate the number of moles of ammonia needed to react with 4.6 moles of oxygen.

4 NH3(g) + 5 O2(g) → 4 NO(g) + 6 H2O(g)

4/5 moles of O2 reacts with 4 moles of NH3.

4.6 moles of O2 reacts with (4/5) x 4.6 moles of NH3.

Therefore, 3.68 moles of NH3 will react with 4.6 moles of O2.

Explanation:

Answer: 4 FeSO4(s) + O2(g) + 10 H2O(l) ---> 4 Fe(OH)3 + 4 H2SO4

Explanation:

FeSO4(s) + O2(g) + H2O(l) = Fe(OH)3 + H2SO4

In other to balance the equation, the total number of atoms of each element on the Left Hand Side (LHS) of the equation must be equal to the total number of atoms on the  Right Hand Side (RHS) of the equation.

Add the following coefficients to the equation;

FeSO4 = Add 4,  H20 = Add 10,  Fe (OH)3 = Add 4 and H2SO4 = Add 4

By doing this, you will discover that the total number of atoms on bothe sides of the equation are balanced; thus we have;

4 FeSO4(s) + O2(g) + 10 H2O(l) ---> 4 Fe(OH)3 + 4 H2SO4

The mass of 0.5 mole of the element is approximately 6.025 grams.

To calculate the mass of 0.5 mole of the element, we need to know the molar mass of the element.

Given that the mass of 2 x 10^21 atoms of the element is 0.4 grams, we can use this information to find the molar mass.

The number of atoms in 1 mole of any substance is given by Avogadro's number, which is approximately 6.022 x 10^23 atoms/mol.

First, we calculate the molar mass of the element using the given information:

Molar mass = Mass of 2 x 10^21 atoms / Number of moles of 2 x 10^21 atoms

Molar mass = 0.4 g / (2 x 10^21 atoms / (6.022 x 10^23 atoms/mol))

Molar mass ≈ 0.4 g / (3.32 x 10^-2 mol)

Molar mass ≈ 12.05 g/mol

Now that we know the molar mass of the element is approximately 12.05 g/mol, we can calculate the mass of 0.5 mole of the element:

Mass = Molar mass x Number of moles

Mass = 12.05 g/mol x 0.5 mol

Mass = 6.025 grams

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Answer:

Option A.

Explanation:

1 mol of anything contains 6.02×10²³ particles.

We know that 1 mol of oxygen gas contains 2 moles of O.

1 mol of oxygen weighs 16 g/mol, the mass for 1 molecule of O.

By the way, the mass for 1 mol of O₂ may be:

Option A  →  16 g/mol . 2 mol

32 g

Oyxgen is a dyatomic molecule, that's why we have 2 moles of O.

Another example can be:

1 mol of water (H₂O) contains 2 moles of H and 1 mol of O.

Answer:

An organism is made up of four levels of organization: cells, tissues, organs, and organ systems. These levels reduce complex anatomical structures into groups; this organization makes the components easier to understand

Explanation: