Chem lab report is attached to the question plz help.

Answer:

478.8 g/cm^3

Explanation:

the best thing to remember is that Volume and density are the only ones that multiply to each other. Density to mass and volume to mass is just division.

Answer:

Excluding hydrogen in group 1, metals

Explanation:

All the elements from group 1 to 12, excluding hydrogen at the top of group 1 are all metals

Answer:

B

Explanation:

The main aim of lab rules is to minimize the no of accidents

The first step to calculate the percent hydrogen by weight of the given solution is to determine the mass of hydrogen in the solution.

CH₂COCH is the molecular formula for acetone, which has a molecular weight of 58.08 g/mol. It has a molecular structure of C3H6O, which means it has 6 hydrogen atoms in its structure.

To determine the amount of acetone present in the solution, we need to use its density. Given that the density of acetone is 0.788 g/mL, the mass of acetone in 53.5 mL of the solution can be calculated as follows:

Mass of acetone = Volume of solution × Density of acetone

Mass of acetone = 53.5 mL × 0.788 g/mL

Mass of acetone = 42.108 g

Now that we know the mass of acetone in the solution, we can calculate the mass of hydrogen present in the solution.

Mass of hydrogen = Number of hydrogen atoms × Atomic weight of hydrogen × Number of moles of acetone

Mass of hydrogen = 6 × 1.008 g/mol × (42.108 g / 58.08 g/mol)

Mass of hydrogen = 2.744 g

Finally, to calculate the percent hydrogen by weight, we divide the mass of hydrogen by the total mass of the solution and multiply by 100.

% hydrogen by weight = (Mass of hydrogen / Total mass of solution) × 100

% hydrogen by weight = (2.744 g / 42.108 g) × 100

% hydrogen by weight = 6.51%

Therefore, the percent hydrogen by weight of the given solution is 6.51%.

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The correct answer is a) Henry's Law. This law states that the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas in the overlying space.

This means that as the partial pressure of the gas increases, more gas molecules will dissolve in the liquid. Henry's Law is important in many areas of science, including chemistry, environmental science, and biology.

For example, it is used to understand the behavior of gases in the atmosphere and their impact on climate change, as well as the ability of aquatic organisms to obtain oxygen from water.

Henry's Law can also be applied to industrial processes such as gas purification and carbonation of beverages.

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Phospholipids are lipids that contain a phosphate group.

A polar, hydrophilic head and a nonpolar, hydrophobic tail make up each phospholipid molecule. In water, the hydrophilic head of a phospholipid is attracted to water molecules, while the hydrophobic tail is repelled by water molecules.

When a phospholipid molecule is introduced to water, its polar heads are oriented towards the water, while its nonpolar tails are oriented away from the water. The hydrophilic heads of phospholipids interact with water molecules, while the hydrophobic tails avoid water.

These properties enable phospholipids to create bilayers in cell membranes that separate cells from their environment and provide the membrane with a barrier to the outside world.

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Formula

\(\ell=\frac{n h}{2 \pi}\)

\(\ell = angular \: momentum\)

\(n = principal quantum number \\ h = Planck's constant \\ \pi = pi\)

Answer:

1. B

2.C

3.D

4.Sorry don't this one :(

5.A

Explanation:

please give me at least 20 points ❤

Once upon a time, there was a spacecraft named "Dawn" that was launched on a mission to study the dwarf planet Ceres. The spacecraft was equipped with state-of-the-art technology and a team of highly skilled scientists and engineers were aboard to control and monitor the mission.

As Dawn approached Ceres, the team was amazed at the vast, barren landscape that stretched out before them. They couldn't wait to start collecting data and analyzing the planet's surface. However, soon after they arrived, they encountered a problem. The spacecraft's landing gear malfunctioned and they were unable to land on the surface.

The team quickly came up with a plan B and decided to study Ceres from orbit. They began to collect data and take pictures of the planet's surface. They were shocked to find that Ceres had a surprisingly varied landscape, with towering mountains, deep craters, and mysterious bright spots.

As the mission continued, the team discovered that Ceres had a subsurface ocean beneath its icy crust. The team was thrilled at this discovery and knew that it would greatly contribute to the understanding of our solar system.

However, just as they were about to wrap up their studies, the team received a distress signal from a nearby spacecraft that was in trouble. Without hesitation, the team of Dawn set course to investigate and assist.

As they neared the other spacecraft, they saw that it was under attack by a group of rogue asteroids. The team of Dawn quickly came up with a plan and using their advanced technology, they were able to defend the other spacecraft and destroy the asteroids.

The other spacecraft, grateful for the help, thanked the team of Dawn and they continued on their journey. The team of Dawn, proud of their bravery and the success of their mission, returned to Earth with a wealth of new data and knowledge about Ceres and the Solar System.

The Dawn spacecraft mission was a great success and it helped scientists understand more about the dwarf planet Ceres, and it also demonstrated the courage, resourcefulness, and the sense of camaraderie of the team.

Answer:

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Answer:

A compound because it cannot be found on the periodic table

Explanation:

The volume of the gas at a pressure of 0.50 atm is 47.84L.

The volume of a gas at a constant temperature can be calculated using the following Boyle's law equation;

PaVa = PbVb

Where;

According to this question, a gas at 25.0 °C occupies 18.4 L at a pressure of 1.30 atm, its volume at a pressure of 0.50 atm can be calculated as follows;

1.3 × 18.4 = 0.5 × Vb

Vb = 23.42 ÷ 0.5

Vb = 47.84L

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Sociology emerged in the early 1800s during a period of great social change when many academics and other educated citizens were fascinated by scientific discoveries social issues like the low high school graduation rate continue to interest sociologists today still important to understand and study society today because it gives students an understanding of the real world around them

Sociology is the of human society and social behavior and it started from 1800s during a period of great social change and studying social sciences gives students an understanding of the real world around them an students learn about places, cultures, and events around the world, what conspired to make them the way they are can make inferences about how the rest of the world works

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Answer:

16 mol

Explanation:

                                 3Cl2 (g) + 8NH3 (g) → N2 (g) + 6NH4Cl (s)    

from reaction                             8 mol                        6 mol

given                                           x mol                       12 mol

8 : x = 6 :12

6x = 12*8

x = 12*8/6 =16 mol                        

The element that is most likely to pair with beryllium in a 1:1 relationship based on valence electron trends would be Se ( 6 valence electrons ). That is option A.

Valence electron is defined as the electron of an atom that is located at the outermost shell which takes part in formation of chemical bonding during a chemical reaction.

The number of Valence electron of the element beryllium = 2

The number of Valence electron of the selenium = 6

Therefore, both beryllium and selenium can form a chemical bond in a 1:1 relationship based on valence electron trends as both will complete their outer most shell into 8 electrons.

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The pH of the mixture of acids is 0.62, the pH of the mixture of acids is 0.63, the pH of the mixture of acids is 0.39, the pH of the mixture of acids is 1.00.

To find the pH of a mixture of acids, we need to first calculate the total concentration of H⁺ ions in the solution, and then use that value to calculate the pH using the formula pH = -log[H⁺].

The chemical formulas for the two acids are:

HBr - hydrobromic acid

HCHO₂ - formic acid

The dissociation reactions for these acids are:

HBr → H⁺ + Br⁻

HCHO₂ → H⁺ + CHO₂⁻

The concentrations of the two acids are given as:

[HBr] = 0.115 M

[HCHO₂] = 0.125 M

To find the total concentration of H⁺ ions in the solution, we need to consider the dissociation reactions of both acids. The H⁺ ions from each acid will contribute to the total H⁺ ion concentration:

[H⁺] = [H⁺ from HBr] + [H⁺ from HCHO₂]

[H⁺] = [HBr] + [HCHO₂]

[H⁺] = 0.115 M + 0.125 M

[H⁺] = 0.24 M

Now that we know the total concentration of H⁺ ions in the solution, we can calculate the pH:

pH = -log[H⁺]

pH = -log(0.24)

pH ≈ 0.62

The chemical formulas for the two acids are:

HNO₂ - nitrous acid

HNO₃ - nitric acid

The dissociation reactions for these acids are:

HNO₂ → H⁺ + NO₂⁻

HNO₃ → H⁺ + NO₃⁻

The concentrations of the two acids are given as:

[HNO₂] = 0.150 M

[HNO₃] = 0.085 M

To find the total concentration of H⁺ ions in the solution, we need to consider the dissociation reactions of both acids. The H⁺ ions from each acid will contribute to the total H⁺ ion concentration:

[H⁺] = [H⁺ from HNO₂] + [H⁺ from HNO₃]

[H⁺] = [HNO₂] + [HNO₃]

[H⁺] = 0.150 M + 0.085 M

[H⁺] = 0.235 M

Now that we know the total concentration of H⁺ ions in the solution, we can calculate the pH:

pH = -log[H⁺]

pH = -log(0.235)

pH ≈ 0.63

The chemical formulas for the two acids are:

HCHO₂ - formic acid

HC₂H₃O₂ - acetic acid

The dissociation reactions for these acids are:

HCHO₂ → H⁺ + CHO₂⁻

HC₂H₃O₂ → H⁺ + C₂H₃O₂⁻

The concentrations of the two acids are given as:

[HCHO₂] = 0.185 M

[HC₂H₃O₂] = 0.225 M

To find the total concentration of H⁺ ions in the solution, we need to consider the dissociation reactions of both acids. The H⁺ ions from each acid will contribute to the total H⁺ ion concentration:

[H⁺] = [H⁺ from HCHO₂] + [H⁺ from HC₂H₃O₂]

[H⁺] = [HCHO₂] + [HC₂H₃O₂]

[H⁺] = 0.185 M + 0.225 M

[H⁺] = 0.410 M

Now that we know the total concentration of H⁺ ions in the solution, we can calculate the pH:

pH = -log[H⁺]

pH = -log(0.410)

pH ≈ 0.39

The chemical formulas for the two acids are:

CH₃COOH - acetic acid

HCN - hydrocyanic acid

The dissociation reactions for these acids are:

CH₃COOH → H⁺ + CH₃COO⁻

HCN → H⁺ + CN⁻

The concentrations of the two acids are given as:

[CH₃COOH] = 0.050 M

[HCN] = 0.050 M

To find the total concentration of H⁺ ions in the solution, we need to consider the dissociation reactions of both acids. The H⁺ ions from each acid will contribute to the total H⁺ ion concentration:

[H⁺] = [H⁺ from CH₃COOH] + [H⁺ from HCN]

[H⁺] = [CH₃COOH] + [HCN]

[H⁺] = 0.050 M + 0.050 M

[H⁺] = 0.100 M

Now that we know the total concentration of H⁺ ions in the solution, we can calculate the pH:

pH = -log[H⁺]

pH = -log(0.100)

pH = 1.00

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A container with no insulation has two compartments. the first compartment is evacuated to zero pressure, and the other contains a compressed gas that is not an ideal gas. supposed the separation between the two compartments is removed-Isothermal process

thermodynamic process wherein the temperature of a framework remains unchanged is known as an isothermal process. Heat is transferred into and out of the system at such a slow rate that thermal equilibrium is retained. The formula gives the value of work done either by gas in an isothermal process. W=−nRTln(V2V1) Isothermal, named after the region's consistent climate, is a two-year comprehensive public institution that is part of the North Carolina Community College System. The primary goal of Isothermal is to improve people's lives through education. Spindale's main campus spans 181 acres.

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The time take to effusion similar amount of cl2 gas under same conditions is 406s, option D.

The process of a gas escaping from a container through a hole that is significantly smaller in diameter than the molecules' mean free route is known as effusion in physics and chemistry. The gas escape is caused by the pressure difference between the container and the outside, which is why such a hole is sometimes referred to as a pinhole. Since there are almost no molecular collisions in the vicinity of the hole, practically all molecules that reach the hole continue and pass through it.

Using Graham's Law of Effusion, we can determine the effusion rate of chlorine gas. Required values to determine the effusion rate are:

Molar mass of N₂ = 28 g/mol

Molar mass of Cl₂ = 70.5 g/mol.

Rate N₂ = 1/255 = 3.921 x 10⁻³ s⁻¹

Isolating for the effusion rate of chlorine gas and by plugging in the necessary values, we arrive with the effusion rate.

rate Cl₂ = rate N₂\(\sqrt{\frac{M_N_2}{M_Cl_2} }\)

= 3.921 x 10⁻³ \(\sqrt{\frac{28}{70.5} }\)

= 2.471 x 10⁻³ s⁻¹

Thus, we arrive with the time below by taking the reciprocal of the effusion rate:

t = 1/2.5x10⁻³

t = 406 s.

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Answer:

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \\\)

From the question

volume = final volume of water - initial volume of water

volume = 16.3 - 15 = 1.3 mL

We have

\(density = \frac{2.21}{1.3} = 1.7 \\ \)

We have the final answer as

Hope this helps you

Answer:

The number of protons in one atom of an element determines the atom's identity, and the number of electrons determines its electrical charge. The atomic number tells you the number of protons in one atom of an element. It also tells you the number of electrons in a neutral atom of that element.

Explanation:

Answer:

The number of protons in one atom of an element determines the atom's identity, and the number of electrons determines its electrical charge. The atomic number tells you the number of protons in one atom of an element. It also tells you the number of electrons in a neutral atom of that element.

Explanation:

The statement is FALSE. Non-ferrous metals can be hardened by heat treatment, although the mechanisms and processes involved may differ from ferrous metals.

Heat treatment techniques such as precipitation hardening can be used to increase the strength of non-ferrous metals. Non-ferrous metals are metals or alloys that do not include iron (or iron allotropes, such as ferrite, etc.) in significant quantities. Non-ferrous metals are employed because they have desired qualities like reduced weight (for example, aluminium), greater conductivity (for example, copper), non-magnetic characteristics, or corrosion resistance (for example, zinc), even though they are often more expensive than ferrous metals. In the iron and steel sectors, several non-ferrous materials are also employed. Bauxite, for instance, is used as a flux in blast furnaces, whereas wolframite, pyrolusite, and chromite are utilised to create ferrous alloys.

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Answer:

83 g

Explanation:

Step 1: Write the balanced equation

2 Fe + 3 S ⇒ Fe₂S₃

Step 2: Calculate the moles corresponding to 95 g of Fe

The molar mass of Fe is 55.85 g/mol.

95 g × 1 mol/55.85 g = 1.7 mol

Step 3: Calculate the moles of S needed to react with 1.7 moles of Fe

The molar ratio of Fe to S is 2:3. The moles of S needed are 3/2 × 1.7 mol = 2.6 mol

Step 4: Calculate the mass corresponding to 2.6 moles of S

The molar mass of S is 32.07 g/mol.

2.6 mol × 32.07 g/mol = 83 g

Answer:

I believe it would be Law of conservation of mass (sorry if I'm incorrect)

Answer:

5. Amplitude.

6. 344.8 meters/second

Explanation:

5. The energy is proportional to the amplitude is all I remember. Sorry :/ Been a long time since I took these classes.

6. Traveling to the wall & back is 200m

100 + 100 = 200m total traveled

The time is 0.58s so, we can use the speed formula to solve [ s = d/t ] where s = speed, d = distance, and t = time.

s = 200/0.58

s = 344.82758

I don’t know if they’ll have you round, but I would say the speed of the sound is 344.8 m/s.

When aqueous solutions of hbr and rboh neutralize each other, in addition to rbbr, the other compound formed is H2O.

When aqueous solutions of hbr and rboh neutralize each other, in addition to rbbr, the other compound formed is H2O. This is because when these two solutions are mixed together, the H+ ions from the hbr react with the OH- ions from the rboh to form water. The remaining ions, the rb+ and br- ions, then combine to form rbbr.

There are several factors that can influence the rate at which a chemical reaction occurs. These include:

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From the given SN1 reaction (picture attached), the major organic product will be 3-ethylpentan-3-ol, the nucleophile, substrate, leaving group, and the rate-limiting step is identified in the attachment.

In the given reaction an alkyl halide 3-bromo-3-ethylpentane is used as a substrate. In the first step of the reaction, alkyl halide dissociates and a carbocation with a Bromide ion generates. The first step of the reaction mechanism is the slow and rate-determining step. In the first step, 3-bromo-3-ethylpentane is the substrate and bromide is the leaving group. In the second step, the water molecule acts as a nucleophile and attacks carbocation. In the final step, bromide removes hydrogen from the water molecule, and the product results.

The complete question and reaction mechanism are attached as a picture.

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To reduce camphor with NaBH4, you can follow these steps:

1. Dissolve the camphor in a suitable solvent such as methanol or ethanol. 2. Prepare a solution of NaBH4 in the same solvent, making sure to handle the reagent with care as it is a strong reducing agent. 3. Slowly add the NaBH4 solution to the camphor solution while stirring continuously. 4. The reaction will proceed quickly, and you should observe the solution becoming cloudy or forming a precipitate. 5. Allow the mixture to stir for a few more minutes to ensure complete reduction of the camphor. 6. After the reaction is complete, you can isolate the product by filtering the mixture and washing it with water or a suitable solvent to remove any impurities.

The reduction of camphor with NaBH4 is a complex chemical reaction that involves several steps and variables, including the choice of solvent, reaction conditions, and the stoichiometry of the reagents. Therefore, it's important to have a good understanding of the chemistry involved and to follow proper safety protocols when working with NaBH4.

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Narrative form or storytelling is used to convey events, experiences, or information. In a narrative form, a single atom of Nitrogen, in the form of Nitrogen gas (N2) travels through different pools. The description of each pool it passes through as a source or a sink is given below:

In the atmosphere:Nitrogen gas is the most abundant gas in the atmosphere, it comprises about 78% of the earth's atmosphere. It is a component of many organic and inorganic compounds in the atmosphere.In the biosphere:Nitrogen-fixing bacteria or lightning can convert nitrogen gas into ammonia. This ammonia can be converted into nitrite and then nitrate through nitrification. This nitrate can be taken up by plants and utilized to make proteins and other molecules that are important for life.

Animals that consume these plants get the nitrogen that they need to build their own proteins. When an organism dies, decomposers like bacteria break down the proteins and return the nitrogen back to the soil in the form of ammonia and other organic compounds.In the atmosphere:Denitrification is the process that converts nitrate to nitrogen gas, which is then released into the atmosphere. This can be done by anaerobic bacteria and other microbes that live in soils and other places where there is little or no oxygen. Human activities that influence the movement of Nitrogen:Humans have a significant impact on the movement of nitrogen in the environment. One of the ways in which they do this is through the use of fertilizers, which contain high levels of nitrogen. These fertilizers can be washed into rivers and streams, where they can cause eutrophication.

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Explanation:

No because the person on the bike is going faster then the person on foot.