Balance this equation
C2H4+______O2--> _____CO2+ ______ H2O

Answer:

Five main characteristics of sedimentary rocks are: ... Sedimentary rocks are largely found on the Earth's surface. They cover 75% area of the Earth. These rocks are generally not crystalline in nature. They are soft and have many layers as they are formed due to the deposition of sediments

Explanation:

-bro look it up

if i am right it should be east North america

Answer:

1.01×10⁻¹⁶ moles (to 3 significant figures)

Explanation:

Using avocado's constant, we can use it to find the number of moles (x) for 61,000,000 atoms of Ne:

1 mole = 6.02×10²³ atoms

x = 61,000,000 atoms

We can solve this by cross-multiplying:

6.02×10²³ × x = 1 × 61,000,000

6.02×10²³x = 61,000,000

To solve for x, divide both sides by 6.02×10²³x:

\( \frac{6.02×10²³x}{6.02×10²³} = \frac{61,000,000}{6.02×10²³ } \)

This cancels out both 6.02×10²³ on the left

\(x = \frac{61,000,000}{6.02×10²³ } \)

\(x = 1.01 \times 10⁻¹⁶\)

A substance's mass is a measure of its amount of matter. Volume is a unit used to describe how much space an object occupies. A volume's density tells us how much matter there is in that space.

Fundamental physical measurements of a thing, such as its mass, volume, and density, can provide important clues about its make-up and condition.

The amount of volume or space that makes up an object or substance is measured by its density. How does density affect each and every part of our existence, then? Gold mining, blood separation, strawberry DNA extraction, and even stacked buildings all depend on density (like the one you see here).

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pH = 1.92, acidic

pH = 8.24, basic

pH = 11.41, basic

pH = 4.34, acidic

To calculate the pH of a solution, we use the formula:

pH = -log[H+]

where [H+] is the concentration of hydrogen ions in moles per liter.

For [H+] = 1.2 x 10^-2 M:

pH = -log(1.2 x 10^-2) = 1.92

This solution is acidic.

For [H+] = 5.8 x 10^-9 M:

pH = -log(5.8 x 10^-9) = 8.24

This solution is basic.

For [H+] = 3.92 x 10^-12 M:

pH = -log(3.92 x 10^-12) = 11.41

This solution is basic.

For [H+] = 4.52 x 10^-5 M:

pH = -log(4.52 x 10^-5) = 4.34

This solution is acidic.

So, the pH and nature of the solutions are:

pH = 1.92, acidic

pH = 8.24, basic

pH = 11.41, basic

pH = 4.34, acidic

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Explanation:

Molarity = mol/liter

Solution 240 mL = NaCl 9.0 g

Solution 1000 mL = NaCl 9.0/240 × 1000 = ..... g

mol NaCl = g/MW

MW NaCl = ?....

...........

Molarity = ......... Molar

As 1  nanometer= 1×10\(^-9\) m , thus 1.1×10\(^-10\) m=1.1×10\(^-1\) nm is the diameter of an atom.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

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Answer: The answer is incus

Answer: A model would be useful because the model makes the concepts easier to understand.

Explanation:

Models are helpful tools in science education that can be used to enhance explanations, spark discussion, make predictions, provide visual representations of abstract concepts, and create mental models.

Answer:

I'm confused I think you're suppose to put a picture if you want someone to answer your question just saying.

Explanation:

Answer:

The understanding of the earth, air, fire, and water as the basic components of matter.

Explanation:

The strict regulations established by USP Chapter <797> regarding hood-cleaning procedures indicate the critical importance of hood cleaning to patient health and safety.

The purpose of these guidelines is to ensure that compounding pharmacies maintain a clean and sterile environment when preparing medications, especially those that will be administered to patients. The guidelines specify the frequency of cleaning and the level of detail required to ensure that the hoods are free of contaminants, which could compromise the quality and efficacy of the compounded products.

Therefore, Failure to comply with these regulations could result in contamination of medications and subsequent harm to patients. Thus, it is crucial to adhere to these guidelines to maintain a safe and sterile environment for compounding medications.

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Answer

c).

Explanation

The long chain of structure C has 6 carbons, meaning its hexane, on carbon 3 and 4

Answer:

2

Explanation:

2Ag+H2S=Ag2S +H2 when you add the coefficient 2 in front of Ag your equation is balanced

The theoretical yield of the reaction between 6.20 g of carbon with excess oxygen is 22.7 g. The actual yield is given 8.35 g. Thus, the percent  yield is 36.7 %.

Percent yield of a reaction is the ratio of its actual yield to the theoretical yield multiplied by 100. The theoretical yield is calculated from the balanced chemical equation of the reaction.

One mole or 12 g of C gives one mole of carbon dioxide. Molar mass of CO₂ is 44 g/mol. Thus, the mass of carbon dioxide that can be produced from 6.20 g of C is :

= (6.20 × 44 ) / 12 g = 22.73 g.

The actual yield of CO₂ is 8.35g only. Thus, its percent yield is calculated as :

percent yield = 8.35 g/ 22.73 g × 100 = 36.7 %.

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According to the question the rate of the reaction at =0 is 8.0 × 10−9 M2·s−1.

A reaction is an action or response to a stimulus. It can be a physical or mental response to the environment, or it can be a chemical reaction that occurs when two or more substances interact with each other. Reactions can be conscious or unconscious, and can involve emotions, memories, thoughts, or behaviors. All reactions are the result of some kind of change that occurs in the body or environment. Reactions can be beneficial or detrimental, depending on the situation. Learning how to recognize and control your reactions can help you make better decisions and lead a healthier, more successful life.

The rate of the reaction at =0 can be calculated by substituting the values of [O3] and [NO] into the rate law:
rate of reaction=[O3][NO]
= (4.0 × 10−4 M) (2.0 × 10−5 M)
= 8.0 × 10−9 M2·s−1
Therefore, the rate of the reaction at =0 is 8.0 × 10−9 M2·s−1.

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They appear as the trait over a recessive allele. Statement C) is true about the dominant alleles.

Dominant alleles are genetic variants that, when present in an individual's genotype, are expressed phenotypically, meaning they determine the visible or observable traits. Dominant alleles are represented by capital letters, while recessive alleles are represented by lowercase letters in genetics.

In terms of inheritance, if an individual has at least one copy of the dominant allele, it will be expressed in the phenotype, regardless of the presence of a recessive allele. This is because dominant alleles exert their influence over recessive alleles, thus "dominating" their expression.

To illustrate this, let's consider a specific example using a trait controlled by a single gene with two possible alleles: dominant (A) and recessive (a). If an individual is homozygous dominant (AA), meaning they possess two copies of the dominant allele, the dominant trait will be expressed.

However, if an individual is homozygous recessive (aa), with two copies of the recessive allele, the recessive trait will be expressed since there are no dominant alleles to override it.

Therefore, dominant alleles appear as the trait over recessive alleles, regardless of the presence or absence of a recessive allele. The presence of even a single copy of the dominant allele is sufficient for its expression in the phenotype. Option C

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The energy of the photon of light can be obtained as 6.27 * 10^-20 J.

We know that a photon has to to do with a particular unit of light. We know that light can be said to be composed of very tiny corpuscles and these corpuscles of light is what we call the photon of the light.

We can be able to us the equation that is derived by Max Plank to be able to get the value of the energy of the photon of light. Now we know that a photon of light can have an energy that is able to be obtained by;

E = hf

h = Plank's constant

f = Frequency

Then;

E = 6.6 * 10^-34 Js * 9.5 * 10^13 Hz

= 6.27 * 10^-20 J

Thus as we can see from the parameters in the question, the energy of the photon is 6.27 * 10^-20 J.

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Answer:

A. it should have a cell wall to give it structure

Answer: Servsafe 9

Explanation:

Remove food from the surface

clean the surface

rinse the surface

sanitize the surface

allow the surface to air dry

Cups and glasses are taking too long to air dry. This could be caused by the ventilation system not working properly. The correct option is D.

A ventilation system is a mechanical device that is normally created and built to supply airflow into and out of a structure or other enclosed space. Because air is provided by a functioning ventilation system, moisture on surfaces like cups and glasses can dry more quickly.

It is possible to describe air-drying as a technique or process for removing moisture from surfaces using either heated, forceful, or dry air. Therefore, air drying aids in making the surface of goods like cups and glasses dry, or free of moisture.

Thus, the correct option is D. The ventilation system not working properly.

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The question is incomplete. Your most probably complete question is given below:

A. Incorrect timing of the wash cycle.

B. An improper use of chemical sanitizer.

C. The water temperature being too high.

D. The ventilation system not working properly.

6.02 x \(10^{20\) formula units of MgCl₂ is equal to 0.1 moles of MgCl₂.

To convert formula units of MgCl₂ to moles of MgCl₂, we need to use Avogadro's number, which relates the number of formula units to the number of moles.

Avogadro's number (NA) is approximately 6.022 x 10^23 formula units per mole.

Given that we have 6.02 x 10^20 formula units of MgCl₂, we can set up a conversion factor to convert to moles:

(6.02 x 10^20 formula units MgCl₂) * (1 mol MgCl₂ / (6.022 x 10^23 formula units MgCl₂))

The formula units of MgCl₂ cancel out, and we are left with moles of MgCl₂:

(6.02 x 10^20) * (1 mol / 6.022 x 10^23) = 0.1 mol

Therefore, 6.02 x 10^20 formula units of MgCl₂ is equal to 0.1 moles of MgCl₂.

It's important to note that this conversion assumes that each formula unit of MgCl₂ represents one mole of MgCl₂. This is based on the stoichiometry of the compound, where there is one mole of MgCl₂ for every one formula unit.

Additionally, this conversion is valid for any substance, not just MgCl₂, as long as you know the value of Avogadro's number and the number of formula units or particles you have.

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Answer:

3.011 × 10²³ atoms of Al

Explanation:

Given data:

Number of moles of Al₂(SO₄)₃ = 0.25 mol

Number of atoms of Al = ?

Solution:

In one mole of Al₂(SO₄)₃  there are 2 moles of Al.

In 0.25 mol × 2 = 0.5 mol

1 mole of any substance contain 6.022 × 10²³ atoms.

In 0.5 moles of Al:

1 mole contain 6.022 × 10²³ atoms.

0.5 mol × 6.022 × 10²³ atoms/ 1 mol

3.011 × 10²³ atoms

1. The constituent gases of air are:

2. The surrounding air is not seen with the eyes because it is transparent. Air molecules are not visible to the na-ked eye, and they do not scatter or absorb visible light significantly. Therefore, air appears colorless and transparent.

3. To prove that air supports burning, you can perform an experiment with a burning candle. Place a glass jar or bell jar over a lit candle, ensuring that the jar is airtight. As the candle burns, it consumes oxygen from the air inside the jar. Eventually, the candle flame will go out due to the lack of oxygen, proving that air (specifically oxygen) is necessary for burning.

4. To show that air occupies space, you can perform a simple experiment using a plastic bottle or syringe. Fill the bottle or syringe with water, ensuring there are no air bubbles. Then, cover the opening tightly and try to compress the air inside. You will find that it is not possible to compress the air significantly, indicating that air occupies space.

5. To prove that air has weight, you can use a sensitive balance or scale. Weigh an airtight container or balloon, and then fill it with air. The weight of the container or balloon with the added air will be greater than its initial weight, demonstrating that air has weight.

6. Air is useful to us in various ways. Three points highlighting the importance of air are:

7. Three properties of air include:

Air exerts force in various ways. For example, air pressure allows objects like airplanes to fly by providing lift. Air resistance or drag opposes the motion of objects moving through the air, creating a force that can affect their speed and trajectory.

8. Four effects of air pollution include:

9. Causes of pollution:

10. Two control measures for air pollution include:

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Sublevel or subshell

Energy Level Sublevels

n = 1  s

n = 2 s and p

n = 3 s, p, and d

n = 4 s, p, d, and f

they each contain orbitals if you need help with how many orbitals they contain let me know

To convert acetone (propanone) to propanal, you can use a two-step process involving reduction and oxidation reactions. Here's a general outline of the process:

1. Reduction of Acetone to Isopropanol:

First, you need to reduce acetone to isopropanol (2-propanol) using a reducing agent. Common reducing agents for this step include sodium borohydride (NaBH₄) or lithium aluminum hydride (LiAlH₄).

Reaction conditions:

- Acetone + NaBH₄ (or LiAlH₄) → Isopropanol

- Solvent: usually an alcohol (e.g., methanol or ethanol) or an ether (e.g., THF)

- Temperature: room temperature or slightly above

2. Oxidation of Isopropanol to Propanal:

Next, oxidize isopropanol to propanal using an appropriate oxidizing agent. A common oxidizing agent for this step is pyridinium chlorochromate (PCC), which selectively oxidizes primary alcohols to aldehydes without over-oxidizing to carboxylic acids.

Reaction conditions:

- Isopropanol + PCC → Propanal

- Solvent: an aprotic polar solvent (e.g., dichloromethane)

- Temperature: room temperature

- Avoid strong oxidizing agents like potassium permanganate (KMnO₄) or chromium trioxide (CrO₃) because they can over-oxidize the isopropanol to propionic acid.

Answer:

use simple calculation.

9% glucose solution is 9g/100ml or 100g/litre

1 mole of glucose is C6H12O6 72+12+96 = 180

100/180 moles / liters = 0.556M glucose

The molar concentration of a 9% glucose solution is calculated by converting the weight/volume percentage to a molar quantity, first by converting grams of glucose to moles and then by converting the volume to liters. The molar concentration is then calculated by dividing the moles of glucose by the volume in liters. For a 9% glucose solution, the molar concentration is 0.5 M.

To calculate the molar concentration of a 9% glucose solution, we first need to understand what the percentage means. Here, 9% weight/volume means there are 9 grams of glucose dissolved in 100 mL of solution.

First, we need to convert grams to moles. The molar mass of glucose (C6H12O6) is approximately 180.16 g/mol. So, 9 grams of glucose would be 9 / 180.16 = 0.05 moles.

Next, we convert milliliters to liters to measure the volume in a form that can be used with molar calculations. 100 mL equals 0.1 L.

The molar concentration of a substance in a solution is the number of moles of that substance divided by the volume of the solution in liters. Thus, we have:

C = n/V = 0.05 moles / 0.1 L = 0.5 M

So, the molar concentration of the 9% glucose solution is 0.5 M.

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Answer:

False

Explanation:

The conversion of units is a process of changing one unit to another, while preserving the same value.

2.62e-7 lb/ft^3 (3 sig figs)

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