If you have a 1234 gram sample of C4H7NO4, how many gams of Carbon would

be present?

Answer:

6. false.  

chemical energy to heat and mechanical. Mechanical that runs the factory in the photo, and Heat energy that rises up in the atmosphere to join the other carbon

molecules in the air. 7. True. The arrow letter A is the transfer of solar power

from the sun, to a chemical reaction to produce food for the plant, which is

called photosynthesis. The leaves in the plant has chlorophyll that absorbs light

energy and transforms it to food.8. The answer would be letter C and F. C because It is

during the burning of the fossil fuels that the carbon dioxide is release into

the atmosphere. When burning the fossil fuels the carbon that was inside the

fossils is released. This also happens with diesel and other forms of natural

gas. While, F is because plant

respiration releases some of the carbon remains of the photosynthesis. While

plants do absorb carbon dioxide, part of their end product also includes reformed

carbon dioxide. Most of the other processes in the phot uses carbon or absorbs

carbon dioxide to aid their sustenance.9. A carbon cycle for living things would be A or B to F

wherein the plants absorb carbon dioxide to aid their production of food, and

then releasing carbon dioxide again as a by product of their food production.

This also happen to aquatic plants.An example of a non-living carbon cycle would be, D or E to

C. This would be the absorption of the carbon on our sea waters or to our soil,

this then gets trapped in there until it is release like through the forms of

fossil fuel burning.10. The law of conservation of mass and energy states that

matter can neither be created nor destroyed, this is very much evident in the

carbon cycle. Because the carbon from the light energy from the sun, or in our

atmosphere, ends up back to our atmosphere just to continue its cycle. The fact

that the carbon cycle is a cycle not just a linear equation proves that energy

can neither be created nor destroyed.

Explanation:

The length of the real-life crystal is 120 cm which is 24 times longer than the length of the crystal in the model.

Given that, a student makes a model of a mineral crystal.

The scale is 1:24. The crystal in the model is 5 cm long.

We are given a scale of 1:24, which means that every unit in the model represents 24 units in real life.

To find the length of the real-life crystal, we need to use the scale factor of 24.

We can set up a proportion to solve for the real-life length of the crystal:

1 unit in the model : 24 units in real life

5 cm in the model : x cm in real life

Using cross-multiplication, we get:

1 × x = 24 × 5

x = 24 × 5

x = 120cm

Therefore, the real-life crystal measures 120cm.

Option A) 120cm is the correct answer.

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Phenol can form hydrogen bonds with water since it contains O-H group but nitrobenzene can not form hydrogen bonds with water.

Polar molecules tend to be soluble in water. The greater the dipole moment, the greater the polarity of the compound. We can see that  Nitrobenzene has a dipole moment of 4.2 x 10-9 esu cm while phenol has a dipole moment of 1.7 x 10-8 esu cm.

Now, It is confusing to observe that the solubility of Nitrobenzene  in water is far less than that of phenol despite its higher dipole moment. The reason for this observation is that, phenol can form hydrogen bonds with water since it contains O-H group but nitrobenzene can not form hydrogen bonds with water.

Therefore, phenol is more soluble in pure water as a solvent compared to nitorbenzene.

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BaSO4 (s) + Cu(NO3)2 (aq)  and KCl (s) + Mg3(PO4)2 (s) is the product of given precipitation reactions.

Ba(NO3)2 (aq) + CuSO4 (aq) → BaSO4 (s) + Cu(NO3)2 (aq)

 K3 PO4 (aq) + MgCl2 (aq) → KCl (s) + Mg3(PO4)2 (s)

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Answer:

9.10% dextrose

Explanation:

To find the mass percent, you need to use the following equation:

                               mass (g) of solute
Mass Percent  =  ---------------------------------  x  100%
                              mass (g) of solution

You can plug the given values into the equation and solve to find the mass percent of dextrose. But first, you need to calculate the mass of the solution.

Mass (solute): 25.0 g

Mass (solution): 250.0 g + 25.0 g = 275 g

                                25.0 grams
Mass Percent  =  ------------------------  x  100%
                                 275 grams

Mass Percent  =  0.0909 x 100%

Mass Percent  =  9.10%

A solution of dextrose contains 25.0 g solute in 250.0 g water. 9.10% is the percentage by mass of dextrose in this solution.

A component's concentration in a combination or compound can be expressed as a mass percent, also known as a weight percent. It shows how much of the total mass of the solution or mixture is made up of the solute's (component's) mass. In chemistry, mass percent is frequently employed and stated as a percentage.

Mass Percent  =     mass (g) of solute/       mass (g) of solution x  100%

Mass (solute): 25.0 g

Mass (solution): 250.0 g + 25.0 g = 275 g

Mass Percent  =25.0 grams /    275 grams x  100%

Mass Percent  =  0.0909 x 100%

Mass Percent  =  9.10%

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Answer:

177.3 meters per second

Explanation:

Assuming that both gases are at the same temperature, we can use Graham's law to calculate the ratio of the average speeds of N2 and He molecules:

(ratio of speeds) = sqrt(molar mass of He/molar mass of N2)

The molar mass of N2 is 28.02 g/mol, and the molar mass of He is 4.00 g/mol. Therefore:

(ratio of speeds) = sqrt(4.00/28.02) = 0.379

We know that the average speed of N2 molecules is 468 m/s. Therefore:

(average speed of He molecules) = (ratio of speeds) x (average speed of N2 molecules) = 0.379 x 468 m/s = 177.3 m/s

Therefore, the average speed of He molecules at the same temperature is approximately 177.3 meters per second.

All of the lipid compounds are soluble in organic solvents but not in water. Among the given examples, the lipids are oils, cholesterol and phospholipids. The correct options are A, B and D.

The organic compounds which consists of carbon, hydrogen and oxygen atoms and they form the framework for the structure and function of living organisms are called lipids.

These compounds are non-polar molecules which are soluble only in non-polar solvents and it is insoluble in water. They are composed of fats and oils. They are energy rich molecules which provide energy to perform different processes.

Thus the correct options are A, B and D.

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The pressure of the gas at the cooler temperature, given that the gas at 110 °C exerts a pressure of 225 torr, is 198.6 torr

The following data were obtained from the question:

The new pressure of the gas can be obtained as shown below:

P₁ / T₁ = P₂/ T₂

225 / 383 = P₂ / 338

Cross multipl

383 × P₂ = 225 × 338

383 × P₂ = 76050

Divide both sides by 383

P₂ = 76050 / 383

P₂ = 198.6 torr

Thus, we can conclude the pressure at the cooler temperature is 198.6 torr

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When thermal energy is being removed from a liquid and it starts to freeze, the temperature of the liquid will remains constant until all the liquid has frozen. This happens because the energy that is being removed is being used to break the bonds between the molecules in the liquid and to form a solid.

Once all the intermolecular bonds have been broken and the liquid has fully solidified, the temperature of the solid will continue to decrease with further cooling.

This process is known as latent heat of fusion, which is the amount of energy required to change a substance from a liquid to a solid state , without any change in temperature.

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Answer:

Earth's thin outer shell is broken into big pieces called tectonic plates. These plates fit together like a puzzle, but they're not stuck in one place. They are floating on Earth's mantle, a really thick layer of hot flowing rock. The flow of the mantle causes tectonic plates to move in different directions.

Explanation:

A net ionic equation for the reaction is :

Cu(s)  + 2H⁺(aq) ---->  Cu²⁺(aq)  + H₂(g)

The reaction of Cu with HBr is given as :

Cu(s) + HBr(aq) --->  CuBr₂(aq)   +  H₂(g)

to balance the equation multiple 2 in HBr , we get the balance equation :

Cu(s) + 2HBr(aq) --->  CuBr₂(aq)   +  H₂(g)

write the complete ionic equation :

Cu(s)  + 2H⁺(aq)  +  2Br⁻(aq) ----->  Cu²⁺(aq)  + 2Br⁻(aq) + H₂(g)

now, cancel out the spectator ion from the equation, spectator ions are the same ion in the reactants and product side, we get :

Cu(s)  + 2H⁺(aq) ---->  Cu²⁺(aq)  + H₂(g)

Thus, this is the net ionic equation of the reaction.

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To balance an equation with the oxidation numbered method we must write the oxidation states of the elements that participate in the reaction.

Once we have the oxidation states we must identify how they change from reactants to products. Thus we identify which are oxidized and which are reduced. If its oxidation state increases it is because the element is oxidized, if it decreases it will have been reduced.

We see that the elements that change their oxidation state are silver, Ag and Oxygen. We have that:

Taking into account the reaction stoichiometry, 36 grams of water (option B) will be produced if you start with 4.0 grams of hydrogen and an excess of oxygen.

In first place, the balanced reaction is:

2 H₂+ O₂  → 2 H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

You can see that by reaction stoichiometry 4 grams of H₂ form 36 grams of H₂O.

In summary, 36 grams of water (option B) will be produced if you start with 4.0 grams of hydrogen and an excess of oxygen.

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According to the given statement Na of the atoms listed below has the largest radius.

An atom is made up of a core nucleus and one or even more electrons with negative charges that orbit it. The positively charged, comparatively hefty protons and neutrons that make it up the nucleus may be present. The fundamental building components of matter are atoms.

Atoms are made up of a nucleus in the center that is surrounded by protons, neutrons, and electron. Uranium is divided into smaller atoms during the fission process, creating new atoms. The creation or atoms in enormous numbers can be seen in the Big Bang and Supernova phenomena.

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Explanation:

Molar mass is the the mass of one mole of a substance and is expressed in g/mol. Gold atomic mass is 196.96657, chlorine has 35.453. Hence, molar mass of AuCl3= atomic number of Gold + atomic mass of chlorine × (number of atoms of chlorine in AuCl3). Molar mass of AuCl3 = 196.96657 + (35.453 × 3).

Answer:

Lake pontchartrain

Explanation:

Choosing a biome for a research project can provide a wealth of opportunities to better understand the natural world and contribute to important conservation and management efforts.

There are several convincing reasons for researchers to choose a particular biome for their project, some of which include:

Biodiversity: Biomes are characterized by their unique plant and animal species, which can provide a diverse range of research opportunities, including studying their adaptations, behaviors, and interactions.

Climate Change: Biomes are also influenced by climate change, making them an important area of research to better understand how these ecosystems are being affected by changes in temperature and precipitation patterns.

Human Impacts: Human activities, such as deforestation, agriculture, and urbanization, can have a significant impact on biomes. Studying these impacts can help researchers better understand how to mitigate and manage these effects.

Biogeochemical Cycles: Biomes are also important for studying biogeochemical cycles, such as the carbon and nitrogen cycles, which are essential for sustaining life on Earth.

Conservation: Finally, studying biomes can also contribute to conservation efforts, helping to preserve these unique ecosystems and the species that inhabit them.

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Answer:

B) Hope this helps! :)

Explanation:

The molarity of the solutions are as follows:

The molarity of a solution is the amount in moles of a substance present in a given volume of solution.

From the image of the solution given:

Therefore, the molarity of the solutions depends on the moles of substance present per given volume of solution.

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"Sam is being a good digital citizen by following a code of conduct.

A code of conduct is a set of rules that govern how people should behave online. It is important to follow a code of conduct because it helps to create a safe and respectful environment for everyone.

Here, Sam is following the code of conduct for his gaming group. This code of conduct may include rules about using offensive language, cheating, and griefing. By following these rules, Sam is helping to create a positive experience for everyone in his gaming group.

Therefore, Sam is following the code of conduct.

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Answer:

The ionic equation to show the dissociation of ions in aqueous copper(II) bromide is:

CuBr2 (aq) → Cu2+ (aq) + 2Br- (aq)

In this equation, CuBr2 represents the copper(II) bromide compound that dissociates into Cu2+ and Br- ions when it is dissolved in water (represented by "aq" for aqueous). The Cu2+ ion has a positive charge of 2+ and the Br- ion has a negative charge of 1-.

Answer:

c

Explanation:

edge 2022

Answer:

Voltage is the measure of electric potential energy per unit charge, current is the flow of electric charge through a circuit, and resistance is the property of a material that opposes the flow of electric current.

Ohm's Law relates these three concepts by stating that current is directly proportional to voltage and inversely proportional to resistance.

Hope this helps!

Cytokines serve as chemical signals between cells and stimulate a wide range of nonspecific defenses.

Cytokines are the proteins which act as soluble mediators and as messengers secreted by one cell to alter its own behavior or that of another cell. They are the regulators of immune responses, working within the immune system and between the immune system and other complex cellular networks within other tissues in the body. This serves the  physical nonspecific defenses of innate immunity include physical barriers, mechanical actions that remove microbes and debris and the microbiome which competes with and inhibits the growth of pathogens. The skin, mucous membranes, and endothelia throughout the body serve as physical barriers.

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Answer:

the molarity of the solution is 0.25 M.

Explanation:

To calculate the molarity of a solution, we need to know the amount of solute in moles and the volume of the solution in liters.

The first step is to calculate the amount of KOH in moles using its molar mass. The molar mass of KOH is the sum of the atomic weights of potassium (39.1 g/mol), oxygen (16.0 g/mol), and hydrogen (1.0 g/mol):

Molar mass of KOH = 39.1 g/mol + 16.0 g/mol + 1.0 g/mol = 56.1 g/mol

The amount of KOH in moles is:

moles of KOH = mass of KOH / molar mass of KOH

moles of KOH = 42.1 g / 56.1 g/mol

moles of KOH = 0.750 moles

Now that we know the amount of KOH in moles, we can calculate the molarity of the solution:

Molarity = moles of solute / liters of solution

Molarity = 0.750 moles / 3.0 L

Molarity = 0.25 M

Therefore, the molarity of the solution is 0.25 M.

Answer: 9.23 moles of solute

Explanation: It's a hard explanation so you can just have the answer.

The number of moles of gas B present in the gas mixture is 2.72 moles.

The given parameters;

The total number of moles of the gases is calculated by applying ideal gas law;

PV = nRT

where;

R is ideal gas constant = 0.0821 L.atm./mol.K

n is the total mole of the gases

\(n =\frac{PV}{RT} \\\\n = \frac{8 \times 14}{0.0821 \times 323} \\\\n = 4.22 \ moles\)

The number of moles of gas B is calculated as follows;

\(n_B = 4.22 - n_A\\\\n_B = 4.22 - 1.5\\\\n_B = 2.72 \ moles\)

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Answer:

4. False

5. False.

6. (b) One mole of a substance contains 6.022 x 10²³ particles of that substance

(c) There are 6.022 x 10²³ carbon atoms in 12.00 g of carbon-12.

7.  The correct option is (A) 3H₂SO₄

8. (b) 1.71 * 10³⁷ atoms of hydrogen

Explanation:

4. 1.00 mole of Ca(NO3)2 contains the same mass of N as 1.00 mole of NaNO3 is False  because 1 mole of Ca(NO3)2 contains 2 moles (28 g) of N atoms whereas 1 mole of NaNO3 contains 1 mole (14 g) of N atoms

5. The theoretical yield of a reaction is generally less than the actual yield is False  because it is the actual yield of a reaction that is always less than the theoretical yield due to some incomplete reactions.

The actual yield is obtained from carrying out the actual reaction while the theoretical yield is calculated from the equation of the reaction.

6. A mole of a substance is defined as the amount of that substance which contains as many elementary particles as there are in 12 g of carbon-12.

From experiments, it was discovered that 12 g of carbon -12 contains 6.02 * 10²³ atoms, therefore, a mole of a substance can also be defined as the amount of that substance which contains 6.02 * 10²³ particles of that substance.

(a) One mole of a substance contains as many particles as exactly 12 amu of carbon-12 is false because 12 amu is the mass of 1 atom of carbon-12 and not a mole of carbon-12.

(b) One mole of a substance contains 6.022 x 1023 particles of that substance is true from the definitions above

(c) There are 6.022 x 1023 carbon atoms in 12.00 g of carbon-12 is true from the definitions above.

(d) Because it is heavier, a mole of iodine atoms contains more particles than a mole of bromine atoms is false because, irrespective of difference in their masses, a mole of all substances contain the same number of particles- 6.02 * 10²³.

7. The balanced chemical equation of the reaction of sulfuric acid with hematite (Fe2O3) to produce iron (III) sulfate and water is as follows: .

Fe₂O₃ + 3H₂SO₄ -----> Fe₂(SO₄)₃ + 3H2O

The correct option is (A) 3H₂SO₄

8. Mass of natural gas = 1.14 * 10¹¹ Kg.

Mass of natural gas in grams = 1.14 * 10¹¹ * 10³ g = 1.14 * 10¹⁴ g

Molar mass of CH₄ = 16g/mol

Number of moles of CH₄ in 1.14 * 10¹⁴ g = 1.14 * 10¹⁴ g/ 16 gmol⁻¹ = 7.125 * 10¹² moles

1 mole of CH₄ contains 4 moles of hydrogen atoms.

7.125 * 10¹² moles of CH₄ will contain 4 * 7.125 * 10¹² moles of hydrogen atoms = 2.85 * 10¹³ moles of hydrogen atoms

1 mole of hydrogen atoms contain 6.02 * 10²³ atoms of hydrogen

2.85 * 10¹³ moles of hydrogen atoms will  contain 2.85 * 10¹³ * 6.02 * 10²³ atoms of hydrogen = 1.71 * 10³⁷ atoms of hydrogen

The amount of the heat needed to boil the 49.6 g of hexane (C₆H₁₄), the beginning from the temperature of 43.4 °C is 19.49 kJ.

The Molar mass of hexane, C₆H₁₄ = 86.18 g/mol.

The boiling point of the hexane = 341.85 K

The Specific heat of hexane = 2.26 kJ/kg K

The Enthalpy of vaporization = 28.85 kJ/mol

The Mass of hexane = 49.6 g = 0.0496 kg

The moles of hexane = mass / molar mass

                                    = 49.6 / 86.18

                                     = 0.577 mol

The amount of heat is as :

q1 = m c ΔT

q1 = 0.0496 × 2.26 ( 341.85 - 316.4 )

q1 = 2.85 kJ

q2 = n ΔH

ΔH = heat of vaporization.

q2 = 0.577 ×  28.85

q2 = 16.64 kJ

The total amount of the heat is needed is as :

q = q1 + q2

q = 2.85 kJ + 16.64 kJ

q = 19.49 kJ

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