Which student is responses are correct?​

Answer:

Explanation: I also have a question if anyone can help in chem please

Answer:

I can’t see the whole page

Explanation:

Answer:

Not doubled

Explanation:

The equation below represent the ideal gases relationship

PV ÷ T = constant

Here

P denotes pressure,

V denotes volume,

T denotes temperature in degrees Kelvin

Now

20 ° c = 273 + 20

= 293 K

And,

40 ° c = 313 K

So,

V = Vo. 313 K ÷  293 K = 1.07 Vo

So,  the volume is NOT doubled.

In the case when the temperature would be determined in degrees celsius at 0 degrees so the volume would be zero

Answer:

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Explanation:

A chemical alteration has occurred. A new material, cottage cheese, with distinct qualities from the original milk and vinegar is produced when the acid in the vinegar and the proteins in the milk react.

The change described is a chemical change. When vinegar, which is an acid, is combined with milk, a reaction occurs between the acid and the proteins in the milk. This reaction causes the milk to sour and thickens, resulting in the formation of cottage cheese. This change cannot be easily reversed, and the resulting cottage cheese is a new substance with different properties than the original milk and vinegar. This is a chemical change because the molecules in the milk and vinegar are rearranged to form a new substance, which has different chemical and physical properties than the original substances. This process is different from a physical change, such as melting ice, which does not result in the formation of a new substance.

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Answer:

ester, ether, haloalkane

Explanation:

EDG.2022

The mechanical stop is released from the horizontal cylinder containing an ideal gas at 1 bar pressure to the left and a vacuum to the right, the frictionless piston will begin to move to the right due to the pressure exerted by the gas.

The expansion is adiabatic, there is no heat transfer q between the system and its surroundings. Therefore, q = 0.
As the gas expands and does work on the piston, the internal energy of the gas decreases. This work done by the gas w is positive because the system is expanding. When the piston has moved to its final position and all the kinetic energy has dispersed, the gas will have expanded into the entire cylinder, and the pressure and temperature of the gas will have decreased. To summarize - w Positive work done by the gas during expansion - q Zero adiabatic process, no heat transfer - ΔU change in internal energy Negative due to work done on the piston. I hope this helps Let me know if you have any other questions.

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Answer:

I think its might be 1 because the ionic numbers for CA is +2 and for P its +3

Answer:

helping hand

Explanation:

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Answer:

The solution formed is acidic

pH = 0.87

Explanation:

The acid-base reaction of NaOH with HCl is:

NaOH + HCl → NaCl + H₂O

Where 1 mole of NaOH reacts with 1 mole of HCl

In the problem, moles of NaOH and HCl are:

NaOH: 0.0250L × (0.525mol / L) = 0.013125 moles NaOH

HCl: 0.0750 × (0.355mol / L) = 0.026625 moles HCl

As moles of HCl > moles NaOH, HCl is in excess and the solution formed is acidic

Moles in excess of HCl are:

0.026625 moles - 0.013125 moles = 0.0135 moles HCl

As the volume of the solutions is 25.0mL + 75.0mL = 100.0mL = 0.100L, molarity of HCl after reaction is:

0.0135 moles HCl / 0.100L = 0.135M HCl = 0.135M H⁺

As pH is defined as - log [H⁺], pH of the solution is:

pH = -log 0.135M H⁺ = 0.87

pH = 0.87

The pH of the resulting solution of the acid and base mixture is; Acidic with a PH = 0.87

We are given;

Volume of NaOH = 25 mL = 0.025 L

Volume of HCl = 75 mL = 0.075 L

Concentration of NaOH = 0.525 M

Concentration of HCl = 0.355 M

Total volume of solution = 0.025 + 0.075 = 0.1 L

Now, the the equation of the reaction is;

HCl + NaOH = NaCl + H2O

We can see that 1 mole of HCl reacts with 1 mole of NaOH.

Since; number of moles = Volume × concentration

Number of moles of HCl = 0.075 × 0.355

Number of moles of HCl = 0.026625 moles

Similarly;

Number of moles of NaOH = 0.025 × 0.525

Number of moles of NaOH = 0.013125 moles

We can see that the number of moles of HCl is greater than that of NaOH and as such there is excess HCl acid in the mix.

Thus,

Excess moles of HCl acid = 0.026625 - 0.013125

Excess moles of HCl acid = 0.0135 moles

Concentration of this excess HCl is gotten by the formula;

M = Excess moles/total volume

M = 0.0135/0.1

M = 0.135 M

PH of this excess concentration is;

PH = -log [H+]

PH = -log [0.135]

PH = 0.87

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The mass in grams of the given beryllium sulfide is 99.2 g. The correct option is the second option - 99.2 g BeS

From the question, we are to determine the mass of the given beryllium sulfide.

From the given information,

Number of moles of beryllium sulfide (BeS) given = 2.42 moles

Using the formula,

Mass = Number of moles × Molar mass

Molar mass of BeS = 41 g/mol

Then,

Mass of BeS = 2.42 × 41

Mass of BeS = 99.22

Mass of BeS ≅ 99.2 g

Hence, the mass in grams of the given beryllium sulfide is 99.2 g. The correct option is the second option - 99.2 g BeS

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Answer:

Explanation:

Understand that the graph of an equation in two variables is the set of all its solutions plotted in the coordinate plane, often forming a curve (which could be a line).

A proportional equation y=kx where k is the so-called "constant of proportionality".

Answer:

purifying copper to produce copper wiring for homes

Explanation:

Answer:

b.purifying copper to produce copper wiring for homes

Explanation:

The volume of nitric acid in mL is 458.6 mL.

The specific gravity of a substance can provide information about its purity, concentration, or composition. The use of specific gravity (SG) to calculate volume using the SI system involves knowing the SG and weight of the substance.

The equation used is the same as in previous sections but rearranged to solve for volume in milliliters (mL) instead of weight in grams.

To calculate volume in mL, divide the weight in grams by the SG.

For example, if you have 642 g of nitric acid with an SG of 1.40:

The volume in mL would be (642 g/1.40) = 458.6 mL.

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The paired t-test yields a different conclusion than the normal t-test because it accounts for the paired nature of the data, comparing the measurements taken at the top and bottom of the lake separately.

In this scenario, the paired t-test is appropriate because it analyzes the data as pairs, considering the chloride levels measured at the top and bottom of the lake for each sample. By comparing the differences within each pair, the paired t-test determines whether there is a significant difference between the chloride levels at the top and bottom of the lake.

Using the paired t-test, the differences between the paired observations are calculated, and the null hypothesis assumes that the mean difference is zero (no significant difference between the top and bottom chloride levels). The test then determines whether the observed differences are statistically significant at a chosen confidence level, in this case, 95%.

The normal t-test for differences in means, on the other hand, would treat the top and bottom chloride levels as separate and unrelated groups, disregarding their paired nature. By pooling the data and conducting a standard t-test, the analysis assumes that the two sets of measurements are independent, which may not be appropriate in this case. This can lead to a different conclusion compared to the paired t-test.

The different conclusion drawn from using the paired t-test compared to pooling the data and using the normal t-test is due to the consideration of the paired nature of the measurements. The paired t-test takes into account the potential correlation or connection between the measurements taken at the same location (top and bottom of the lake) and assesses the differences within each pair.

Pooling the data and using the normal t-test treats the measurements as independent, disregarding the pairing. This can result in a loss of valuable information and may lead to an inaccurate conclusion. The paired t-test is more appropriate when dealing with dependent or related measurements, ensuring a more accurate assessment of the differences between the top and bottom chloride levels.

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The lead resistance effect can be minimized by using a 3-wire connection to the sensor within the Wheatstone bridge circuit is the most effective method to minimize lead resistance effect in RTD measurement.

The lead resistance effect in RTD measurement refers to the contribution of the resistance of the connecting wires to the total measured resistance, which can cause measurement errors. To minimize this effect, different techniques can be used.

Among the given options, the most effective method to minimize lead resistance effect in RTD measurement is to use a 3-wire connection to the sensor within the Wheatstone bridge circuit. This configuration compensates for the resistance of the lead wires by measuring the voltage drop across the lead wires separately and subtracting it from the total voltage drop across the bridge circuit.

Option a) using wires with large lead resistance is not effective, as this would only increase the contribution of the lead resistance to the total measured resistance.

Option b) using a special two-wire configuration can reduce the effect of lead resistance, but it is less effective than the 3-wire configuration, as it does not allow for separate measurement of lead resistance.

Option c) using RTDs with very low initial resistance is not effective, as this would only decrease the magnitude of the lead resistance effect, but not eliminate it.

Option e) a combination of the above options is not necessary, as the 3-wire configuration alone is sufficient to minimize the lead resistance effect.

To minimize the lead resistance effect in RTD measurement, a 3-wire connection to the sensor within the Wheatstone bridge circuit is the most effective method. This configuration compensates for the resistance of the lead wires by measuring the voltage drop across the lead wires separately and subtracting it from the total voltage drop across the bridge circuit, resulting in more accurate temperature measurements.

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Answer:0

Explanation: zero because it is the most stable form of oxygen in its standard state

Answer:

Answers with the explanation.

Explanation:

Surprisingly all of the answers were C for some reason:

14. C (Extensive Properties include mass, volume and length)

15. C (Boiling/Melting/Freezing point are examples of physical change)

16. C (Malleability is how bendable an object is, therefore a physical change)

17. C (For Example, Water only forms Water Vapor when it´s heated up)

Answer:

1.F

2.A

3.C

4.E

5.B

6.D

7.B

8.F

9.A

10.E

11.D

12.C

13.B

14.C

15.C

16.C

17.C

Explanation:

The molarity of a solution that contains 122 g of MgSO₄ in 3. 5 l of solution is 0.29 ≈ 0.3 mol/L.

The molarity of a solution is defined as the ratio of the number of moles of solute present in the solution to the volume of the solution in litres. It is denoted by M.

M= number of moles of solute / volume of the solution in litres

number of moles ,n = mass/ molar mass

molar mass of MgSO₄

= atomic mass of Mg + atomic mass of S + 4 × atomic mass of O

=24 +32 + 4 × 16

120 g/mol

given,

mass of MgSO₄  = 122g

volume of the solution in litres = 3.5L

∴ number of moles of MgSO₄  

= 122g/120gmol⁻¹

=1.017 mol

∴ Molarity of the solution

= 1.017 mol /3.5L

= 0.29 mol/L

≈0.3 mol/L

Thus, the molarity of the solution is approximately 0.3 mol/L

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Answer:

Your problem is already in standard form.

Explanation:

Unless you wanted coverted to regular notation. Which is 0.0000832.

It measure the number of elementary entities of a given substance that are present in a given sample. 1.99 moles of glucose are present in 1.2 x 10²⁴  molecules.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance. The stoichiometry represents the number of moles. Mole is directly proportional to the number of given molecules.

Given number of atoms= 3.01x10²³atoms

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

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

Substituting the values, we get

mole of glucose= 1.2 x 10²⁴÷6.02 x 10²³

mole of glucose= 1.99 moles

Therefore, 1.99 moles of glucose are present in 1.2 x 10²⁴  molecules.

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The goal of the Viscosity lab is to investigate how temperature influences viscosity.

Viscosity is a measure of a fluid's resistance to flow. In this lab, the main question being addressed is how temperature affects viscosity. By conducting experiments and analyzing the results, the goal is to understand the relationship between temperature and the flow properties of a fluid.

The lab may involve measuring the viscosity of different liquids at various temperatures and observing how the viscosity changes as the temperature is manipulated. The focus is on examining how the internal structure and intermolecular forces within the fluid are affected by temperature, leading to changes in viscosity.

By answering this question, the lab aims to provide insights into the fundamental properties of fluids and their behavior under different temperature conditions, contributing to a better understanding of the concept of viscosity.

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Answer:

B

Explanation:

Physical properties can be observed without changing the identity of the substance.

Option B. Physical properties can be observed without changing the identity of the substance best describes physical properties.

Physical property refers to any property that can be measured, observed. It has no connection to the chemical property of any matter.

Physical and chemical properties enable us to distinguish between matter or things. And on that regard, physical properties focus on the physical nature of the matter like shape, size, etc. Thus, the correct answer is option B.

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Moles of Mercury Nitrate

Mass

Answer:

1,840g

Explanation:

I just took the test and got it right :)

Answer:

Its 357 y'all

Explanation:

add me on brain liest.

Answer:

357

Explanation:

Answer:

No that was 2 different plagues happening at the same time.

Explanation:

Answer:

Alex forgot to get a flu shot and missed two weeks of school