Calibrated equipment will always have repeatable and reproducible measurements

a. True
b. False

Answer: False

Explanation: just took on edge

Answer:

200J

Explanation:

This is because 500J - 300J = 200J

I hope this helps!!!

Answer:

1700 Joules. I Took the test.

Explanation:

(A) Sulfur (S) is the atom that contains exactly two unpaired electrons, and (E) Bromine (Br) is the atom that contains only one electron in the highest occupied energy sublevel.

(A) Sulfur (S) has an electron configuration of 1s² 2s² 2p⁶ 3s² 3p⁴. The highest energy level, or valence shell, for sulfur is the third energy level (n = 3). The 3p sublevel has four electrons (3p⁴), and among them, two are unpaired. These two unpaired electrons in the 3p sublevel make sulfur the atom that contains exactly two unpaired electrons.

(E) Bromine (Br) has an electron configuration of 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁵. The highest occupied energy level for bromine is the fourth energy level (n = 4). The highest energy sublevel within the fourth energy level is the 4p sublevel. In the 4p sublevel, there are five electrons (4p⁵), and only one electron is needed to complete the sublevel. Thus, bromine contains only one electron in the highest occupied energy sublevel.

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The reaction between CdSO₄ and K₂S is a precipitation reaction where cadmium sulfide precipitates as a solid, while potassium sulfate remains in the aqueous form.

a) The "(s)" in the chemical equation CdS(s) represents that cadmium sulfide is a solid precipitate. It indicates that the product formed in the reaction is solid.

b) The chemical equation for the dissolution of cadmium sulfate (CdSO₄) in water is:

CdSO₄(s) → Cd²⁺(aq) + SO₄²⁻(aq)

The chemical equation for the dissolution of potassium sulfide (K₂S) in water is:

K₂S(s) → 2K⁺(aq) + S²⁻(aq)

c) The difference between potassium sulfate being aqueous (K₂SO₄(aq)) and cadmium sulfide being a solid (CdS(s)) lies in their solubility in water. Potassium sulfate is soluble in water, meaning it dissolves and dissociates into its respective ions (K⁺ and SO₄²⁻) in the solution. On the other hand, cadmium sulfide is insoluble in water and forms a solid precipitate, indicating that it does not dissolve but instead forms solid particles.

In the lab, the difference can be observed by visual inspection. When the reaction between CdSO₄ and K₂S takes place, a yellow precipitate of cadmium sulfide will form, indicating the presence of the solid. The potassium sulfate, being in an aqueous form, will remain dissolved and not form any visible solid.

d) The name for this type of reaction is a precipitation reaction or double displacement reaction. In this reaction, the ions from two compounds exchange to form an insoluble solid (precipitate) and a soluble compound.

In the given reaction between CdSO₄ and K₂S, cadmium sulfide (CdS) is the insoluble solid (precipitate), and potassium sulfate (K₂SO₄) is the soluble compound formed in solution.

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Answer: A

Explanation:

Extreme weather events follow normal climate patterns.

Answer: Carbon cycle wouldn't be able to create rock formation. Respiration, consumption, combustion (such as fossil burning) are all part of the carbon cycle. They would all be possible without internal energy. Except rock formation.

Explanation:

To determine the range of initial concentrations, we need to consider the dilution process and the given information.

The initial volume of the vinegar sample is 10 mL, and it is diluted to a final volume of 100 mL. Therefore, the dilution factor is calculated by dividing the final volume by the initial volume:

Dilution factor = Final volume / Initial volume = 100 mL / 10 mL = 10

The diluted solutions are prepared by adding 10 mL of the vinegar sample to a 100 mL volumetric flask and filling it up to the mark with water. So, the final volume of each diluted solution is 100 mL.

Given that the diluted solutions are prepared from the original vinegar sample, we can infer that the percentage concentration refers to the mass/volume percentage. In this case, the percentages (5% and 8%) represent the mass of acetic acid (the main component of vinegar) present in 100 mL of the original sample.

To calculate the molarity of the diluted solutions, we need to know the molar mass of acetic acid, which is approximately 60.05 g/mol.

For the 5% solution:

Mass of acetic acid in 100 mL = (5 g / 100 mL) × 100 mL = 5 g

Using the molar mass, we can convert the mass of acetic acid to moles:

Moles of acetic acid = Mass of acetic acid / Molar mass = 5 g / 60.05 g/mol

Now, we can calculate the molarity:

Molarity (5% solution) = Moles of acetic acid / Final volume (in liters) = (5 g / 60.05 g/mol) / 0.1 L

For the 8% solution, we follow the same steps:

Mass of acetic acid in 100 mL = (8 g / 100 mL) × 100 mL = 8 g

Moles of acetic acid = Mass of acetic acid / Molar mass = 8 g / 60.05 g/mol

Molarity (5% solution) ≈ 0.833 M (rounded to three decimal places)

Molarity (8% solution) ≈ 1.333 M (rounded to three decimal places)

Therefore, the range of initial concentrations is approximately 0.833 M to 1.333 M for the diluted DIVA Sciences' White Vinegar solutions.

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Answer:

both are made of atoms. .

Answer:

Both are made of atoms.

Explanation:

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 40.51 g is the mass of 2.31x10²³ formula units of SrF[tex]_2[/tex].

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance. It measure the number of elementary entities of a given substance that are present in a given sample.

Given number of atoms= 2.31x10²³atoms

we know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number

mole =given number of atoms ÷ 6.022×10²³(Avogadro number)

Substituting the values

mole= 2.31x10²³÷ 6.022×10²³

mole = 0.38 moles of SrF[tex]_2[/tex]

mass of SrF[tex]_2[/tex]= moles of SrF[tex]_2[/tex] × Molar mass of SrF[tex]_2[/tex]

mass of SrF[tex]_2[/tex]= 0.38  × 106.6184

mass of SrF[tex]_2[/tex] = 40.51 g

Therefore, 40.51 g is the mass of 2.31x10²³ formula units of SrF[tex]_2[/tex].

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Answer:

A Liquid

Explanation:

structure with large distance (gas) than goes to a loosely ordered state (liquid)

I hope this helps

The standard enthalpy change for the given reaction is approximately -156.87 kJ.

To calculate the standard enthalpy change (ΔH°) for the given reaction using standard heats of formation, the balanced equation for the reaction is:

Fe(s) + 2HCl(aq) → [tex]FeCl_2[/tex](s) + [tex]H_2[/tex](g)

The standard heats of formation (ΔH°f) for the compounds involved are as follows:

Fe(s): 0 kJ/mol

HCl(aq): -92.31 kJ/mol (source: NIST Chemistry WebBook)

[tex]FeCl_2[/tex](s): -341.49 kJ/mol (source: NIST Chemistry WebBook)

[tex]H_2[/tex](g): 0 kJ/mol

Now, let's calculate the standard enthalpy change (ΔH°):

ΔH° = Σ(ΔH°f products) - Σ(ΔH°f reactants)

ΔH° = [ΔH°f([tex]FeCl_2[/tex]) + ΔH°f([tex]H_2[/tex])] - [ΔH°f(Fe) + 2ΔH°f(HCl)]

ΔH° = [-341.49 kJ/mol + 0 kJ/mol] - [0 kJ/mol + 2(-92.31 kJ/mol)]

ΔH° = -341.49 kJ/mol + 2(92.31 kJ/mol)

ΔH° = -341.49 kJ/mol + 184.62 kJ/mol

ΔH° = -156.87 kJ/mol

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The structure of compound X is likely 2-Methyl-1-butene (CH3CH=C(CH3)CH2CH3) to yield a product without chirality centers during hydroboration-oxidation.

a. Suggesting three possible structures for compound X (C5H10) can involve considering different isomers of pentane and pentene. Here are three possibilities:

Pentane: CH3CH2CH2CH2CH3

2-Methylbutane: CH3CH(CH3)CH2CH3

2-Methyl-1-butene: CH3CH=C(CH3)CH2CH3

These structures satisfy the molecular formula C5H10 and represent different isomeric possibilities for compound X.

b. Hydroboration-oxidation of compound X yields a product with no chirality centers. This suggests that compound X must be an alkene with a symmetric or non-chiral structure. Among the three possible structures suggested above, the alkene 2-Methyl-1-butene (CH3CH=C(CH3)CH2CH3) would result in a product with no chirality centers when subjected to hydroboration-oxidation.

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Answer: I honestly think it might be C

Explanation: Collisions between objects are governed by laws of momentum and energy. When a collision occurs in an isolated system, the total momentum of the system of objects is conserved. ... In the collision between the two cars, total system momentum is conserved.

Answer: C. The total momentum after the collision is equal to the total momentum before the collision.

Hope this helps

Explanation: Collisions between objects are governed by laws of momentum and energy. When a collision occurs in an isolated system, the total momentum of the system of objects is conserved. ... In the collision between the two cars, total system momentum is conserved.

Answer:

algae

Explanation:

fish and herons arent herbivores

Herbivores are typically tagged as animals that feeds directly on the plants in a food chain.

In the given food chain, Fish is the herbivore

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The vaporization of liquid water to steam is a spontaneous process when the temperature is above its boiling point at a pressure of 1 atm.

At 1 atm, the boiling point of water is 100 degrees Celsius or 212 degrees Fahrenheit. When the temperature of the water reaches or exceeds this value, the average kinetic energy of the water molecules increases, allowing more molecules to overcome the intermolecular forces and escape into the gas phase. At temperatures below the boiling point, water molecules have lower average kinetic energy, and the intermolecular forces between the water molecules are stronger. In this case, the rate of evaporation is slower, and the process is non-spontaneous. However, it is important to note that even at temperatures below the boiling point, water molecules with higher kinetic energy can still evaporate from the surface. Above the boiling point, the kinetic energy of the water molecules is sufficient to overcome the intermolecular forces completely, and the evaporation process becomes more rapid and spontaneous. The water molecules have enough energy to transition into the gas phase without requiring additional external energy input. It is crucial to maintain a temperature within the appropriate range to ensure a spontaneous vaporization process. If the temperature falls below the boiling point, the process may slow down or stop altogether. Conversely, if the temperature rises significantly above the boiling point, it may result in superheating, where the water remains in the liquid state despite being above the boiling point. This can be unstable and potentially lead to a sudden, explosive boiling known as a "bump." Therefore, maintaining a temperature within the range of the boiling point of water at 1 atm pressure ensures a spontaneous and controlled vaporization process.

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Answer:

0.7 is the right

Explanation:

Given :

A compound is found to be made up of 3.21 g Carbon and 1.02 g Oxygen.

To Find :

The percent composition from this data.

Solution :

We know, percentage composition is given by :

[tex]\%mass = \dfrac{mass}{mass of compound}\times 100[/tex]

So, percentage composition of Carbon is :

[tex]\%Carbon = \dfrac{3.21}{3.21+1.02}\times 100\\\\\%Carbon = \dfrac{3.21}{4.23}\times 100\\\\\%Carbon = 75.89 \%[/tex]

Since, compound is made up of Carbon and Oxygen.

So, %Oxygen is ( 100 - 75.89 )% = 24.11%

Hence, this is the required solution.

Answer:

number of protons in the atom

Explanation:

Everything else has something to do with neutrons or weight, which you cannot know from just the atomic number. The atomic number is how many protons are in an element

The one that cannot be metabolised to make molecules that can enter the citric acid cycle is d. metal ions.

Carbohydrates, lipids, and proteins can all be metabolized to produce molecules that can enter the citric acid cycle (also known as the Krebs cycle or TCA cycle). These molecules can be converted into acetyl-CoA, a key intermediate in the citric acid cycle, through various metabolic pathways.

Carbohydrates can be broken down into glucose, which can then undergo glycolysis to produce pyruvate. Pyruvate can be further converted into acetyl-CoA, which enters the citric acid cycle.

Lipids (fats) can be hydrolyzed to release fatty acids and glycerol. Fatty acids are broken down through beta-oxidation, resulting in the production of acetyl-CoA. Glycerol can also be converted into glyceraldehyde-3-phosphate, an intermediate in glycolysis that can generate pyruvate and subsequently acetyl-CoA.

Proteins can be broken down into amino acids through protein digestion and cellular processes such as proteolysis. Amino acids can enter various metabolic pathways, some of which lead to the production of intermediates that can feed into the citric acid cycle.

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Given, the balanced chemical equation is:

2 NH₃(g) → N₂(g) + 3 H₂(g)

The absolute magnitude of the rate of change for [NH₃] is 4.35 m/s.

Therefore, option A is the correct answer.

Given, the balanced chemical equation is:

2 NH₃(g) → N₂(g) + 3 H₂(g)

The rate of change for H2 is 8.70 m/s.

To find the absolute magnitude of the rate of change for [NH₃], we have to use the stoichiometric coefficient in the balanced chemical equation. From the balanced chemical equation, 2 mol NH₃ reacts with 3 mol H₂

We can write,

Rate of change of NH₃ (in m/s) = -1/2 * rate of change of H₂ (in m/s)

So,Rate of change of NH₃ = -1/2 * 8.70 m/s= -4.35 m/s

The absolute magnitude of the rate of change for [NH₃] is 4.35 m/s.

Therefore, option A is the correct answer.

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Answer:

0.642 g

Explanation:

La ecuación balanceada es:

Primero convertimos 1.89 g de Cu₂O en moles, usando su masa molar:

Después convertimos moles de Cu₂O en moles de Mg, usando los coeficientes estequiométricos:

Finalmente convertimos moles de Mg en gramos, usando la masa molar de Mg:

The percent by mass of the solution made from 17 g sodium chloride, NaCl (the solute) and 59 g water is 22.4%

First, we shall obtain the mass of the solution. Details below:

Mass of solution = Mass of NaCl + mass of water

Mass of solution = 17 + 59

Mass of solution = 76 grams

Finally, we shall determine the percent by mass of the solution. Details below:

Percent by mass = (mass of NaCl / mass of solution) × 100

= (17 / 76) × 100

= 22.4%

Thus, the percent by mass of the solution is 22.4%

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If a radioactive isotope has a half-life of 400 million years, it will take 400 million years for 50% of the material to change to the daughter product.

How long it takes for half of the radioactive atoms to decay is known as the half-life of the isotope. A radioactive isotope's half-life is the amount of time it takes for half of the parent material to decay to the daughter product. It's worth noting that a half-life isn't a fixed amount of time for each radioactive isotope.

The following formula can be used to calculate the amount of radioactive isotope remaining after a given period of time:

t=ln(N₀/N) / λ

Where:

For this problem, we need to solve for the time (t) at which 50% of the radioactive isotope has decayed:

0.5N₀ = N₀ e^(-λt)

0.5 = e^(-λt)

t = ln(0.5) / (-λ)

We know that the half-life of this isotope is 400 million years, which means that λ is equal to:

ln(2) / (400,000,000 years)

λ = 0.00000000017 / year

Substituting that value into the formula:

t = ln(0.5) / (-0.00000000017 / year)

t ≈ 400,000,000 years

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The best statement that describes the reflection of a wave is: When a wave reflects off a surface, it retains its characteristics and changes direction.

A wave is defined as a disturbance that moves through space and matter with the transfer of energy from one place to another. When the wave moves from one medium to another, it reflects off the surface. Reflection of a wave is described as the change in the direction of the wave when it bounces back from the surface on which it strikes.

When a wave reflects off a surface, the angle of incidence is equal to the angle of reflection, which is known as the law of reflection. The normal line, which is perpendicular to the surface, splits the incident and reflected waves at the point of incidence. The angle between the normal line and the incident wave is the angle of incidence, and the angle between the normal line and the reflected wave is the angle of reflection.

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The oxidation number of bromine in the HBrO molecule is +1. Bromine usually has multiple oxidation states, and in HBrO, it has an oxidation state of +1, the correct answer is b.

This can be determined by assigning oxidation numbers to the other atoms in the molecule and applying the rules for assigning oxidation numbers. In HBrO, hydrogen (H) has an oxidation state of +1, and oxygen (O) typically has an oxidation state of -2. Since the sum of oxidation numbers in a neutral molecule is zero, the oxidation number of bromine (Br) is determined to be +1.

To further explain, oxidation numbers represent the hypothetical charge an atom would have if all the bonds were purely ionic. In HBrO, hydrogen (H) is typically assigned an oxidation state of +1, as it usually donates its one valence electron to form a single bond. Oxygen (O) is generally assigned an oxidation state of -2, as it commonly accepts two electrons to complete its valence shell. The sum of the oxidation numbers in HBrO is then +1 for hydrogen and -2 for oxygen, resulting in a net oxidation number of -1. Since the molecule is neutral, the oxidation number of bromine (Br) must be +1 to balance the charges and achieve a total oxidation number of zero. Therefore, the correct answer is b. +1.

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Answer:

33% yield

Explanation:

6.26/18.81 =0.33280170122 = 33%

To determine the amount of water that can be made from a given number of hydrogen molecules, the molar ratio between hydrogen and water needs to be considered. Based on the balanced chemical equation for the formation of water, 2 moles of hydrogen molecules (H2) react to form 2 moles of water (H2O). Using the Avogadro's number and molar mass of water, the calculation can be performed to find the mass of water in grams.

The balanced chemical equation for the formation of water is:

2H2(g) + O2(g) → 2H2O(l)

From the equation, it can be observed that 2 moles of hydrogen molecules (H2) react to produce 2 moles of water (H2O).

Using Avogadro's number (6.022 × 10^23 molecules per mole), we can determine the number of moles of hydrogen molecules present in 3.58 × 10^24 hydrogen molecules:

Number of moles of hydrogen = (3.58 × 10^24) / (6.022 × 10^23) = 5.95 moles

Since the molar ratio between hydrogen and water is 2:2, we can conclude that 5.95 moles of hydrogen will produce 5.95 moles of water.

To find the mass of water, we need to multiply the number of moles of water by the molar mass of water. The molar mass of water (H2O) is approximately 18.015 g/mol.

Mass of water = 5.95 moles × 18.015 g/mol = 107.17 g

Therefore, approximately 107.17 grams of water can be made from 3.58 × 10^24 hydrogen molecules.

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