Most ethylene (C₂H₄), the starting material for producing polyethylene, comes from petroleum processing. It also occurs naturally as a fruit-ripening hormone and as a component of natural gas.
(b) How many grams of C₂H₄ must burn to give 70.0 kJ of heat?

The statement that is true about chemical nutrients in an ecosystem is : D.) They recycle within the ecosystem, being constantly reused. Therefore, option D) is the correct answer.

The nutrient cycle is vital to the ecosystem, and this is how nutrients are recycled in it. Nutrients that are considered chemical nutrients include carbon, hydrogen, oxygen, nitrogen, and phosphorus.What are chemical nutrients in an ecosystem

Chemical nutrients refer to essential elements that are found in an ecosystem's physical and chemical environment. These elements are necessary for life because they are responsible for different functions such as cell structure, the production of enzymes, and the production of hormones.

In conclusion, chemical nutrients recycle within the ecosystem, being constantly reused. Nutrient recycling helps to maintain the ecosystem's sustainability. It helps to maintain the balance of life forms within the ecosystem.

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Answer:

true

Explanation:

its A

The above statement is considered to be correct and true.

The Occupational Safety and Health Administration (OSHA) is a federal agency that is saddled with the responsibility of assuring and ensuring a safe and healthy working conditions for an employee or group of employees by doing the following;

According to the Occupational Safety and Health Administration (OSHA), trainings on the adoption and application of safety precautions (tools) such as wearing a personal protective equipment (PPE); face masks (respirators), ear plugs, safety boots, gloves, helmet, etc., are very important and are essentially to be used by all employees (workers) while working in hazard prone environments or industries.  

However, when an employee fails to strictly adhere to the recommended OSHA safety precautions, he or she is more likely to sustain a work-related accident or injury from a fall. Thus, this would negatively affect (impact) the employee because it results in him or her being absent from work (time off) and requires some costs to pay for medicals (medical cost).

In conclusion, injuries from work related falls can affect employees by resulting in time off and medical cost.

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The salt that would lower the freezing point of water the most is sodium chloride.

Sodium chloride is the most effective salt at decreasing the freezing point of water. This is because sodium chloride has the highest solubility of all the salts, meaning that it can dissolve and form a solution with a higher concentration of solute. This leads to a decrease in the freezing point of water, as the solute molecules interfere with the structure of the water molecules and prevent them from forming an orderly pattern. Other salts, like potassium chloride, magnesium sulfate, and calcium chloride, may still lower the freezing point of water, but to a lesser degree compared to sodium chloride.

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Calcium chloride is the salt which lower the freezing point of water the most.

The freezing point can be defined as the is the exact temperature at which a liquid becomes a solid. The freezing point of water is 32 degrees Fahrenheit. Freezing point describes the moment of transition much as the melting point captures the moment when ice turns from a solid to a liquid. Normal fresh water freezes at 32 degrees Fahrenheit and seawater freezes at about 28.4 degrees Fahrenheit because of the salt in it. Calcium chloride is highly soluble in water. It lowers the freezing point of water the most. Both calcium chloride and magnesium chloride have lower the freezing points. When calcium chloride comes in contact with ice, it rapidly lowers the freezing point of water and melts snow and ice quickly. Calcium chloride forms brine faster than other salts because of its hygroscopic properties.

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The complete question is,

Assuming all the salts below are the same concentration, which salt would lower the freezing point of water the most?

(a) magnesium chloride

(b) calcium chloride

(c) sodium chloride

You can calculate surface area of syringe tip with equation SA = πr(r + √(r2 + h2))

To calculate the surface area of the syringe tip, you need to know the dimensions of the syringe tip. If the syringe tip is a cone shape, you can use the formula for the surface area of a cone:

SA = πr(r + √(r2 + h2))

Where SA is the surface area, r is the radius of the base of the cone, and h is the height of the cone.

Step 1: Measure the radius and height of the syringe tip.
Step 2: Plug the values into the formula.
Step 3: Solve the equation to find the surface area.

For example, if the radius of the syringe tip is 2 cm and the height is 4 cm, the surface area would be:

SA = π(2)(2 + √(22 + 42))
SA = π(2)(2 + √(4 + 16))
SA = π(2)(2 + √20)
SA = π(2)(2 + 4.472)
SA = π(6.472)
SA = 20.345 cm²

Therefore, the surface area of the syringe tip is 20.345 cm².

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Answer:

Explanation:

The percent ionization of hydrazoic acid (HN3) in a 0.100 M solution is 4.36%.

To calculate the percent ionization of hydrazoic acid (HN3) in a 0.100 M solution, we first need to determine the Ka value for the acid. According to Appendix D in most general chemistry textbooks, the Ka value for HN3 is 1.9 x 10^-5.

Next, we can set up the equilibrium equation for the ionization of HN3:

HN3 + H2O ⇌ H3O+ + N3-

We can assume that the initial concentration of HN3 is equal to 0.100 M, and since the acid is monoprotic, the initial concentration of H3O+ and N3- ions is 0. Therefore, at equilibrium, we can assume that x moles of HN3 have ionized to form x moles of H3O+ and N3- ions.

Using the Ka expression for HN3, we can write:

Ka = [H3O+][N3-] / [HN3]

1.9 x 10^-5 = x^2 / (0.100 - x)

Solving for x, we get x = 0.00436 M. This represents the concentration of H3O+ and N3- ions at equilibrium.

To calculate the percent ionization, we can use the formula:

% ionization = (moles of H3O+ formed / initial moles of HN3) x 100

Since we assumed that x moles of HN3 ionized to form x moles of H3O+ and N3- ions, we can say that moles of H3O+ formed = x. The initial moles of HN3 is equal to the initial concentration times the volume of the solution (assuming a volume of 1 L):

initial moles of HN3 = 0.100 M x 1 L = 0.100 moles

Therefore, % ionization = (0.00436 moles / 0.100 moles) x 100 = 4.36%.

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For the quantum numbers n = 2, ℓ = 1, mℓ = 1, there can be a maximum of two electrons.

The term quantum numbers refer to the numbers that describe the position of electron in an atom.

There are four sets of quantum numbers which are;

For the quantum numbers n = 2, ℓ = 1, mℓ = 1, there can be a maximum of two electrons.

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Approximately 13836 grams (or 13.8 kg) of liquid water is required to absorb 3.12×10^4 kJ of heat energy on boiling.

To find the mass of liquid water required to absorb 3.12×10^4 kJ of heat energy on boiling, we need to use the following formula:

q = m * ΔH

Where

The enthalpy of vaporization of water is 40.7 kJ/mol.

To convert kJ to J, we multiply by 1000:

q = 3.12×10^4 kJ = 3.12×10^7 J

Substituting the values, we get:

3.12×10^7 J = m * (40.7 kJ/mol)

To solve for the mass of water, we need to first convert the enthalpy of vaporization to J/g:

40.7 kJ/mol = 40.7×10^3 J/mol

The molar mass of water is 18.015 g/mol, so we can calculate the enthalpy of vaporization per gram:

40.7×10^3 J/mol / 18.015 g/mol = 2257 J/g

Substituting this value, we get:

3.12×10^7 J = m * (2257 J/g)

Solving for m, we get:

m = 3.12×10^7 J / (2257 J/g)

m ≈ 13836 g

Therefore, approximately 13836 grams (or 13.8 kg) of liquid water is required to absorb 3.12×10^4 kJ of heat energy on boiling.

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Answer: Yes, sulfuric acid is highly soluble in water.

Explanation:

Answer:

Proton (p for positive): Positive +1 charge, relative mass of 1

Neutron (sounds like neutral): no charge, relative mass of 1

Electron (sounds like electric): negative charge, relative mass of 0.0005

To calculate the empirical formula, we first need to determine the moles of each element present in the compound.

Assuming a 100g sample of the compound, we can calculate the mass of each element present:

Mass of H = 11.19g
Mass of O = 88.79g

Next, we need to convert these masses into moles:

Moles of H = 11.19g / 1.01 g/mol = 11.08 mol
Moles of O = 88.79g / 16.00 g/mol = 5.55 mol

To find the simplest whole number ratio of the elements, we divide the number of moles of each element by the smallest number of moles:

Moles of H / Moles of O = 11.08 mol / 5.55 mol = 2

Therefore, the empirical formula of the compound is H2O.

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An enzyme lowers the energy needed for the reaction to occur. Option 7 is correct.

Enzymes are biological catalysts that speed up chemical reactions in living organisms. They are typically proteins that have a specific shape that allows them to bind to a substrate (the molecule being transformed by the reaction) at a specific site called the active site. Enzymes work by lowering the activation energy of a reaction, which is the energy needed to start the reaction.

By lowering the activation energy, enzymes make it easier for the reactants to form products, thus increasing the rate of the reaction. Enzymes achieve this by bringing the reactants (substrates) closer together in the active site, allowing them to interact more easily and increasing the likelihood that they will form products.

Enzymes can also alter the shape of the substrate, making it more reactive or more stable in the transition state of the reaction. Overall, enzymes help to speed up chemical reactions in the cell by lowering the activation energy and making it easier for the reactants to form products. Option 7 is correct.

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Number 7.

It lowers the energy needed for the reaction to occur.

k12 unit test

The pKa of weak acid HA is B. 4.63

How to determine the pKa of a weak acid?

To calculate the pKa of the weak acid HA, given that a solution of 0.65 M HA and 0.85 M NaA has a pH of 4.75, follow these steps:

Step 1. Use the Henderson-Hasselbalch equation:

pH = pKa + log ([A-]/[HA]).

In this case, [A-] = 0.85 M (from NaA) and [HA] = 0.65 M.

Step 2. Plug in the known values: 4.75 = pKa + log (0.85/0.65).

Step 3. Solve for pKa:

Subtract log (0.85/0.65) from both sides:

pKa = 4.75 - log (0.85/0.65) ≈ 4.63.

So the pKa of the weak acid HA is approximately 4.63 (Option B).

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Answer:

2.75M

Explanation:

Concentration(M)= mol/volume

0.0688mol/0.250L

=0.2752M

Answer:

Carbon has 6 protons and electrons, so it has 2 in the 1S orbital, 2 in the 2S orbital, and 2 in the 1P orbital.

Explanation:

Answer:

false

Explanation:

The question requires us to calculate the mass, in grams, contained in 5.26 x 10^-4 mol of HC2H3O2.

To solve this question, first we need to calculate the molar mass of the compound, considering the number of atoms of each element, and then relate the value obtained with the number of moles given (5.26 x 10^-4 mol).

First, to calculate the molar mass of the compound, let's consider the following atomic masses:

atomic mass of C = 12.01 u

atomic mass of H = 1.007 u

atomic mass of O = 15.99 u

Next, we calculate the molar mass. To do that, we need to consider the number of atoms of each element: according to the chemical formula, there are 2 atoms of C, 4 atoms of H and 2 atoms of O:

molar mass (C2H4O2) = (2 * 12.01) + (4 * 1.007) + (2 * 15.99) = 60.03 g/mol

Now, we know that there are 60.03 g for each mol of the compound. With that information, we can estabilish the following relation to calculate the mass contained in 5.26 x 10^-4 mol of the compound:

1 mol --------------------- 60.03 g

5.26 x 10^-4 mol ----- x

Solving for x, we have:

Therefore, there are 0.03158 g of HC2H3O2 in 5.26 x 10^-4 mol of this compound.

When a large rainstorm hits your town and it rains all day, is a stage of water cycle known as precipitation.

The water cycle shows the continuous movement of water within the Earth and atmosphere.

There are three main parts to the water cycle and they are listed below:

The evaporation of water occurs when the water on earth surface such as lakes, rivers, ocean, etc, gains heat, turn into water vapour and escapes into the atmosphere.

The next stage after evaporation in water cycle is condensation, the warmer water vapour comes in contact with cooler air in the atmosphere or clouds, lose heat and form water droplets which accumulates in the cloud.

The last stage in the water cycle is precipitation; when the condensed water droplets in the cloud saturates the cloud, it precipitates in form of rain fall, and the process continues to infinite.

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Answer: 2.13

Explanation: i crawled so you could run :)

Answer:

Remains the same

Explanation:

I just got it right on Acellus!

Answer:

What artifacts did historian Tom Garner find in the Pensacola Bay area?

Fork from Hernando de Soto ship

Plate from Jamestown colony

Olive jar from Tristan de Luna colony of 1559

Telescope from Ponce de Leon

Explanation:

What artifacts did historian Tom Garner find in the Pensacola Bay area?

Fork from Hernando de Soto ship

Plate from Jamestown colony

Olive jar from Tristan de Luna colony of 1559

Telescope from Ponce de Leon

Answer:I’m not 100% sure but I think it’s the first answer.

Explanation:

The pressure would increase as the molecules are pushing out word more and more, leading to more space being taken and more pressure. But then again, I’m not sure. I’m just a freshman with below average grades.

Kc and Kp are related by the ideal gas law and the change in the number of moles of gas in the reaction. By using these equations, one can convert between the two equilibrium constants.

Kc and Kp are both equilibrium constants used in chemical reactions. Kc is the equilibrium constant for a reaction in terms of concentration, while Kp is the equilibrium constant for a reaction in terms of pressure.

The two are related by the ideal gas law, PV=nRT,

where P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is temperature. To convert from Kc to Kp, the equation is:

p = Kc(RT)^(Δn) Where Δn is the change in the number of moles of gas in the reaction.

This equation can also be rearranged to convert from Kp to Kc:

Kc = Kp/(RT)^(Δn)

In summary, Kc and Kp are related by the ideal gas law and the change in the number of moles of gas in the reaction. By using these equations, one can convert between the two equilibrium constants.

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Answer:

Cause and effect relationships are routinely identified, tested, and used to explain change.

Explanation:

Answer:

Answers are in the explanation

Explanation:

Precision and accuracy are both statistical concepts. Precision is about how close are the measured values to each other. Accuracy is closeness of the measured values to a specific value or reference value.

There are many ways to calculate precision and accuracy, one is stimating precision as Relative Uncertainty and accuracy as Relative Error.

Formulas are:

Relative Uncertainty: Standard desviation /  Measured value.

Relative Error: Measured Value - Expected Value / Expected value

Measured value is the aveage of the values.

For student 1:

Mean = 25

Standard desviation = 1.5275

Relative Uncertainty: 1.5275 /  25

Relative Uncertainty: 0.061

Relative Error: 25 - 20 / 20

Relative Error: 0.25

For student 2:

Mean = 24.5

Standard desviation = 0.5477

Relative Uncertainty: 0.5477 / 24.5

Relative Uncertainty: 0.02

Relative Error: 24.5 - 20 / 20

Relative Error: 0.225

As the student 2 has a low Relative error and uncertainty, you can say student 2 is more accurate and precise

There are 1.31 x 1022 bromide ions in 2.00 g of \(MgBr_2\).

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Answer:

use a tumbler to cover a candle that is burning, after a few minutes it turns off automatically without any external forces due to the absence of oxygen

Explanation:

Answer:

B

Explanation:

b/c air is not seen by eye