Suppose that the average velocity (vrms) of carbon dioxide molecules (molecular mass is equal to 44.0 g/mol) in a flame is found to be 1.05×105 m/s . What temperature does this represent?

Answer:

aswer is A

Explanation:

because the CL,K,AR is correct since it is order right

Accrued expenses is the most likely item on the income statement and balance sheet to vary spontaneously with sales (option 3).

Accrued expenses refer to an expense that a company has incurred but has not yet paid for. For example, wages that employees have earned but not yet received payment for, rent, interest, and taxes that have been accrued but not yet paid are all examples of accrued expenses.

Accrued expenses are spontaneous liabilities, which means they vary in proportion to a company's sales volume. The higher the sales, the more the company is likely to owe in accrued expenses. The company must record the accrued expenses as liabilities on the balance sheet and as expenses on the income statement.

Accrued expenses are likely to increase when sales volume increases, and they decrease when sales volume decreases. It means that accrued expenses are the most likely item on the income statement and balance sheet to vary spontaneously with sales.

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The isotope that is best suited for use as a radioactive tracer for the body’s use of calcium is calcium-45 (Option B)

A radioactive tracer is a radioisotope that is used to monitor chemical reactions and flows of substances within the human body, plants, and animals, and other natural systems. The technique works by substituting a radioactive isotope in a molecule that is chemically indistinguishable from the normal nonradioactive molecule.

The isotope's radioactivity is then used to track its movement through the body. The calcium-45 isotope is the only one that emits beta particles that are used in tracing studies.

The half-life of calcium-45 is 160 days, making it a long-lasting tracer that can be used to track slow metabolic processes over long periods of time. Calcium-45 emits beta particles, which are easy to detect and measure while remaining harmless to the body.

Thus, the correct option is B.

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The combined mass of hydrochloric acid and sodium hydroxide is determined by adding their individual masses.

When calculating the combined mass of hydrochloric acid and sodium hydroxide, we need to consider the individual masses of these two substances. Hydrochloric acid (HCl) has a molecular formula of HCl and consists of one hydrogen atom (H) and one chlorine atom (Cl). Sodium hydroxide (NaOH), on the other hand, is composed of one sodium atom (Na), one oxygen atom (O), and one hydrogen atom (H). To calculate the combined mass, we add the individual masses of these reactants.

The molar mass of hydrogen (H) is approximately 1 gram/mol, while the molar mass of chlorine (Cl) is approximately 35.5 grams/mol. Sodium (Na) has a molar mass of around 23 grams/mol, oxygen (O) has a molar mass of approximately 16 grams/mol, and hydrogen (H) has a molar mass of around 1 gram/mol.

To determine the combined mass of hydrochloric acid and sodium hydroxide, we multiply the number of atoms of each element by their respective molar masses and sum them up. For example, hydrochloric acid has one hydrogen atom and one chlorine atom, so the total mass would be 1 gram/mol (hydrogen) + 35.5 grams/mol (chlorine). Similarly, sodium hydroxide has one sodium atom, one oxygen atom, and one hydrogen atom, resulting in a combined mass of 23 grams/mol (sodium) + 16 grams/mol (oxygen) + 1 gram/mol (hydrogen).

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8.94 moles of silicon dioxide would produce 17.88 moles of water.

The balanced chemical equation for the reaction of silicon dioxide (SiO2) with water (H2O) is as follows:

\(SiO^2 + 2H^2O - > H^4SiO^4\)

The balancing equation shows that 2 moles of water (H2O) are created for every 1 mole of silicon dioxide. As a result, we can use the mole ratio to determine how many moles of water are created when 8.94 moles of \(SiO^2\) react:

Moles of water = \(2 * Moles of SiO^2\)

Moles of water = 2 * 8.94 moles

Moles of water = 17.88 moles

Therefore, 8.94 moles of silicon dioxide would produce 17.88 moles of water.

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Answer:

D. 10mm = 1 cm

E. 1000m = 1mm

G. 100 cm = 1 m

H. 1 m = 10 dm

Answer:

A. when winds are to strong

B. cool tempatures

Explanation:

Answer:

what subject is this? science?

Answer:

Stannic chloride

Explanation:

Answer: Physical properties, but not in its identity

Explanation:

Physical changes only change the substances physical properties, not the substance’s identity

Conjugation requires p orbitals on three or more adjacent atoms in a structure.

The overlap of one p orbital with another over an adjacent bond is referred to as conjugation (in transition metals d orbitals can be involved). A conjugated system in a molecule is a system of connected p orbitals with delocalized electrons that reduces the overall energy of the molecule and promotes stability. It is typically represented by alternating single and multiple bonds. The system, which can be cyclic, acyclic, linear, or mixed, may contain lone pairs, radicals, or carbenium ions. Johannes Thiele, a German chemist, created the term "conjugated" in 1899. A conjugated system has a band of overlapping p orbitals that bridges the interjacent places where simple diagrams show no link.

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Answer

-52.2 Joules

Explanation

Given that;

Mass of krypton, m = 12.3 g

Temperature change, ΔT = 22.2°C - 39.3°C = -17.1°C

The specific heat of gaseous krypton, c = 0.248 J/g°C.

What to find:

The energy change, Q.

Step-by-step solution:

The energy change, Q can be determined using:

Q = mcΔT

Putting the values of the given parameters into the formula, this yields:

Therefore the energy change = -52.2 Joules

If the sample of magnesium used in a lab was contaminated with another metal that doesn't react with hydrochloric acid, then the results obtained in the experiment would be affected.

This is because the data collected during the experiment would reflect the reaction between hydrochloric acid and the contaminated sample instead of pure magnesium. As a result, the following changes in results might have been observed:

1. The mass of the contaminated sample would be higher than the mass of pure magnesium.

2. The rate of reaction between the contaminated sample and hydrochloric acid would be slower than the reaction between pure magnesium and hydrochloric acid.

3. The volume of hydrogen gas collected from the reaction would be lower than the volume of hydrogen gas collected in the reaction between pure magnesium and hydrochloric acid.

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Answer:

At the end of meiosis, there are four cells, each with 23 chromosomes, for a total of 92 chromosomes split between the four cells.

Explanation:

During meiosis, a diploid cell  (46 chromosomes) replicates its DNA (making 92 chromosomes) then undergoes two cell divisions to generate four haploid cells (23 chromosomes).

These haploid cells are the gametes which, during fertilization, fuse to become a zygote with 46 chromosomes.

Answer:

the person above me is correct.

Explanation:

Answer:

C

Explanation:

1. The molecule has to have a ratio of 1 hydrogen to 1 oxygen.

2. Hydrogen = 1amu, Oxygen = 16amu. (2*2)+(16*2) = 34amu

A compound's empirical formula is H.O. If the formula mass is 34 amu, the molecular formula is HO3. Therefore, option C is correct.

A chemical formula is a method of presenting information about the chemical proportions of atoms that make up a specific chemical compound or molecule by using chemical element symbols, numbers, and, in some cases, other symbols such as parentheses, dashes, brackets, commas, and plus and minus signs.

Molecular formulas indicate the number of atoms of each element in a compound, whereas empirical formulas indicate the simplest or most reduced ratio of elements in a compound. If the molecular formula of a compound cannot be reduced any further, the empirical formula is the same as the molecular formula.

A chemical compound's empirical formula is the simplest whole number ratio of atoms present in the compound.

The ratio of molecule is 1 hydrogen to 1 oxygen.

Hydrogen = 1amu,

Oxygen = 16amu.

( 2*2 ) + ( 16*2 ) = 34 amu

Thus, option C is correct.

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Answer:

raising the Concentration of liquid

raise the temperature of the system

bubbles of hydrogen gas

The correct IUPAC name of the compound is 7-chlorohept-(3E)-en-1-yne.

The IUPAC name of a compound is determined by following a set of rules established by the International Union of Pure and Applied Chemistry (IUPAC). To determine the correct name of the compound given, we need to analyze its structure and identify the functional groups, substituents, and their positions.

In this case, the compound has a chain of seven carbon atoms (hept) with a chlorine atom (chloro) attached at the 7th position. It also contains a triple bond (yne) and a double bond (en) on adjacent carbon atoms. The stereochemistry of the double bond is indicated by the E configuration, which means that the two highest priority substituents are on opposite sides of the double bond.

Therefore, the correct IUPAC name of the compound is 7-chlorohept-(3E)-en-1-yne.

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Answer:

lol

Explanation:

Answer:

none of them are equal to one mole

The mass of carbon that resulted from the decomposition of 37 L of carbon dioxide is 19.8 g

CO₂ —> C + O₂

From the balanced equation above,

1 L of CO₂ decomposed to produce 1 L of C.

Therefore,

37 L of CO₂ will also decompose to produce 37 L of C

At standard temperature and pressure (STP),

22.4 L = 1 mole of C

Therefore,

37 L = 37 / 22.4

37 L = 1.65 mole of C

Thus, the mass of Carbon can be obtained as follow:

Mass = mole × molar mass

Mass of C = 1.65 × 12

Mass of C = 19.8 g

Thus, 19.8 g of carbon were obtained from the reaction.

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Answer:

The answer is

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

From the question

mass of alcohol = 100 g

density = 0.79 g/mL

The volume is

\(volume = \frac{100}{0.79} \\ = 126.58227848...\)

We have the final answer as

Hope this helps you

The condition that H₂ must be under to be in corresponding states with CO₂ is at a temperature of approximately 43.6 K and a pressure of approximately 1.77 bar.

To find the condition when H₂ is in a corresponding state to CO₂ at 400 K and 10.0 bar, we'll use the reduced temperatures and pressures. Reduced temperature (Tr) and reduced pressure (Pr) can be calculated using the critical temperature (Tc) and critical pressure (Pc) with the following formulas:

Tr = T / Tc
Pr = P / Pc

For CO₂, Tr_CO₂ = 400 K / 304.2 K ≈ 1.315 and Pr_CO₂ = 10.0 bar / 73.7 bar ≈ 0.136.

Now, we need to find the conditions for H₂, where Tr_H₂ = Tr_CO₂ and Pr_H₂ = Pr_CO₂:

Tr_H₂ = T_H₂ / 33.2 K = 1.315 => T_H₂ ≈ 43.6 K
Pr_H₂ = P_H₂ / 13.0 bar = 0.136 => P_H₂ ≈ 1.77 bar

So, H₂ is in a state corresponding to CO₂ at 400 K and 10.0 bar when it is at a temperature of approximately 43.6 K and a pressure of approximately 1.77 bar.

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Answer:

oxygen level reduces

Explanation:

because oxygen supports burning

Over-titrating a sample of potassium hydrogen phthalate (KHP) results in an inaccurate calculation of the unknown molarity of the solution. This is because KHP is an impure substance and contains other substances, such as moisture.

If the sample is over-titrated, the total moles of KHP will be overestimated, resulting in an incorrect calculation.

The best way to prevent over-titrating is to use an accurately measured volume of titrant. This can be done by using a volumetric pipette or burette to measure out the exact volume of titrant required. Additionally, the tip of the titrant should be placed as close to the solution as possible to ensure that the entire volume is transferred.

Another way to prevent over-titrating is to check the equivalence point. The equivalence point is the point where the amount of titrant used is equal to the amount of KHP in the sample. This can be determined by comparing the colors of the indicator solution before and after the titrant has been added. If the colors of the indicator solution remain the same, it is likely that the sample has been over-titrated.

Finally, the sample should be titrated until the end point is reached. The end point is the point at which the amount of titrant added is greater than the amount of KHP in the sample. This is usually determined by observing the colors of the indicator solution. If the color of the indicator solution remains the same, the end point has not been reached and more titrant should be added.

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Answer:

either i have no brain or im over thinking it

Explanation:

Answer:

See Explanation

Explanation:

We must first convert the gas pressures to a common unit. I choose to convert all pressures to kiloPascal.

Since;

1 kilopascal = 7.501 torrs

X. =1900tor

X= 1900 × 1/7.501

X= 253.3 Kpa

Since 1 PSI =6.895 kilopascals

132.3PSI = 132.3 × 6.895/1

= 912.2 Kpa

Total pressure = 303.9kPa + 912.2 Kpa + 253.3 Kpa = 1468.8 kPa

For first gas;

303.9/1468.8 × 100 = 20.7%

For second gas;

912.2/1468.8 × 100 = 62.1%

For the third gas;

253.3/ 1468.8 × 100 = 17.2%

Give an example of where a scientist might be: a. accurate but not precise. b. precise but not accurate. c. both precise and accurate, are listed below.

What is accurate?

Accuracy is the measure of how closely a measurement resembles the actual or accepted value. How closely two measurements of the same thing differ is referred to as precision.

What is precise?

The precision of an object is defined as the similarity between two or more measurements. If you weigh an object five times and it weighs 2 kg each time, the measurement has precision but not necessarily accuracy, or it might be the other way around.

Therefore, Give an example of where a scientist might be: a. accurate but not precise. b. precise but not accurate. c. both precise and accurate, are listed below.

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a. Accurate but not precise:

An example of a scientist being accurate but not precise could be a situation where a scientist measures the boiling point of a substance and obtains a series of measurements consistently close to the accepted value but with a wide range of variation among the measurements. Although the measurements may not be precise (due to the variability), they are accurate because they are close to the true value.

b. Precise but not accurate:

An example of a scientist being precise but not accurate could be a scenario where a scientist uses a faulty instrument to measure the length of an object. The measurements obtained may consistently show the same value (high precision) but differ significantly from the actual length (low accuracy). In this case, the measurements are precise (consistent) but not accurate (far from the true value).

c. Both precise and accurate:

An example of a scientist being both precise and accurate could be a situation where a scientist measures the weight of an object using a highly calibrated and accurate weighing scale. The scientist obtains several measurements that are all very close to each other (high precision) and also very close to the true weight of the object (high accuracy). In this case, the measurements are both precise and accurate, indicating a high level of reliability and validity.

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The mass of titanium that can be extracted from 570 kg of titanium chloride is 144302.4 g.

Titanium chloride weighs 570 kg, or = 570000 / 189.6 moles. As 189.6 g make up 1 mole of titanium chloride, that equals 3006.3 moles.

Now, we can see from the equation that 1 mole of titanium chloride results in 1 mole of titanium.

Consequently, 3006.3 moles of titanium chloride are converted into 3006.3 moles of titanium.

Considering the atomic weights of Cl 35.5 and Ti 48

So, 48 x 3006.3 g times 3 moles of titanium equals 144302.4 g.

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Answer:

Populations have genetic variation.

The environment changes.

Organisms must have specific traits in order to survive and reproduce.

Explanation:

Natural selection provides an advantage during an adverse condition for organisms that have a rich genetic variation in their population.

Also, environmental changes induced natural selection whereby organisms must adapt to changes around them.

For organisms to survive, they must have specific traits that gives them a competitive reproductive advantage.

Answer:

BCE, person above is right! got a 100.

Explanation: