Which energy transformation occurs in an exothermic reaction?
B. Energy from the chemical bonds of the reactants is released to the surroundings
Or
C. There is a net flow of energy from the system out to the surroundings

The fact that real yield is lower than theoretical yield is not due to the conservation of mass. According to the rule of conservation of mass, no new mass may be formed during a chemical process.

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the question is incomplete. the question you are looking for is

Which of the following is not a reason why actual yield is less than theoretical yield?

A. Impure reactants present

B. Loss of product during purification

C. Conservation of mass

D. Competing side reactions

Answer:

1.Sulfur dioxide and nitrogen oxide

2.a)it forms carbonic acid

b)

3.the community can use renewable energy like solar and wind power cause they produce less pollution

The brightness of a glow stick is not directly correlated with the reaction rate of the chemicals inside the stick. Glow sticks operate based on a chemical reaction called chemiluminescence.

This reaction involves the mixing of two chemicals, usually hydrogen peroxide and a phenyl oxalate ester, with a fluorescent dye. When these chemicals mix, they react and release energy in the form of light without producing heat. The brightness of the glow stick is determined by the amount of light produced by the reaction.

The reaction rate of the chemicals inside the glow stick is affected by various factors such as temperature, concentration, and the presence of a catalyst. The reaction rate determines how quickly the chemicals react and produce light.

However, the brightness of the glow stick is not necessarily directly related to the reaction rate of the chemicals. The brightness can also be influenced by other factors such as the type and concentration of fluorescent dye used in the stick. Some dyes produce more intense colors and therefore a brighter glow, while others produce less intense colors and a dimmer glow.

In summary, while the brightness of a glow stick is a result of the chemiluminescent reaction occurring inside it, it is not directly correlated with the reaction rate of the chemicals. Other factors, such as the type and concentration of fluorescent dye used in the stick, can also influence the brightness of the glow stick.

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First, we define density as:

Density = mass/volume;

We focus first on the volume of air in the room.

Volume:

We have the measurements of where the air is.

We calculate the volume with these measurements, but first, we change the units to L:

1 inch = 2.54 cm

1 L = 10^3 cm^3

1 ft = 12 inch

Now,

11.0 ft x (12 in/1 ft) x (2.54 cm/1 in) = 335.28 cm

12.0 ft = 365.76 cm

10.0 ft = 304.8 cm

Therefore, the volume of the room = 335.28 cm x 365.76 cm x 304.8 cm

Volume = 37378237.5 cm^3 x (1 L/10^3cm^3) = 374 x 10^2 L

From the Density equation, we clear the mass:

Density x volume = mass (g)

1.19 g/L x 374x10^2 L = 445x10^2 g x (1 kg/1000 g) = 44.5 kg

Answer: 44.5 kg

The balanced equation obeys the law of conservation of mass. Here among the given options, the balanced equation is 2Mg + O₂ → 2MgO. The correct option is C.

A chemical equation in which the number of atoms of reactants and products on both sides of the equation are equal is defined as the balanced chemical equation. The amount of reactants and products on the both sides of the equation are equal.

The numbers which are used to balance the chemical equation are called the co-efficient. The coefficient is added in front of the formula. Since it obeys the law of conservation of mass, mass can neither be created nor be destroyed.

Here the balanced equation is:

2Mg + O₂ → 2MgO

The number of 'Mg' and 'O' atoms on both sides of the equation are equal. So it is a balanced equation.

Thus the correct option is C.

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London dispersion forces are the only intermolecular forces that exist between the molecules that make up SiH4.

London dispersion forces, also referred to as dispersion forces, London forces, instantaneous dipole-induced dipole forces, fluctuating induced dipole bonds or, more loosely, van der Waals forces, are a type of intermolecular force that interacts with atoms and molecules that are typically electrically symmetric, meaning that the electrons are distributed symmetrically with respect to the nucleus. The van der Waals forces include them. The LDF bears Fritz London's name, a German physicist. The least powerful intermolecular force, they.

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Answer:

Percent yield = 7.1%

Explanation:

The general reaction of the problem is:

Ca(OH)₂ + CO₂ → H₂O + CaCO₃

To solve this question we need to find theoretical yield using the amount of carbon dioxide added because:

Percent yield = Actual yield (3.22g) / Theoretical yield * 100

Theoretical yield is the maximum amount of product that could be obtained. To find it we need to convert the mass of CO₂ to moles. The moles of CO₂ = Moles of CaCO₃:

Moles CO₂ -Molar mass: 44.01g/mol):

20.0g * (1mol / 44.01g) = 0.454 moles CO₂ = Moles of CaCO₃ produced

Mass CaCO₃ = Theoretical yield -Molar mass: 100.09g/mol-:

0.454 moles * (100.09g / mol) = 45.5g of CaCO₃ = Theoretical yield.

Replacing:

Percent yield = 3.22g / 45.5g * 100

No idea what this is for, but I hope you have an amazing day:)

pH is the hydrogen ion concentration and pOH is the hydroxide ion concentration in the solution. pH KOH is 12.73, pOH KOH is 2.24 and pH NaCl is 7.

pH is the negative log of the hydrogen ion concentration and pOH is the negative log of the hydroxide ion concentration.

The relation between the pH and pOH can be given as, \(\rm pOH = 14 - pH\)

The pH of KOH can be calculated by the formula,

\(\rm pH = \rm -log [H^{+}]\)

In the first case, the concentration of the KOH is \(1. 87 \times 10^{-13}\;\rm M\)

Substituting values in the equation:

\(\begin{aligned} \rm pH &= \rm -log [H^{+}]\\\\&= \rm -log [1. 87 \times 10^{-13}\;\rm M ]\\\\&= 12.73\end{aligned}\)

Hence, the pH of KOH is 12.73.

pOH of KOH can be calculated by the formula,

\(\rm pOH = \rm -log [OH^{-}]\)

The hydroxide concentration of the KOH solution is \(5. 81 \times 10^{-3}\;\rm M\)

Substituting value in the equation:

\(\begin{aligned} \rm pOH &= \rm -log [OH^{-}]\\\\&= \rm -log [5. 81 \times 10^{-3}\;\rm M ]\\\\&= 2.24 \end{aligned}\)

Hence, the pOH of KOH is 2.24

The pH of NaCl can be calculated by the formula,

\(\rm pH = \rm -log [H^{+}]\)

In the third case, the concentration of the NaCl is \(1. 00\times 10^{-7}\;\rm M\)

Substituting values in the equation:

\(\begin{aligned} \rm pH &= \rm -log [H^{+}]\\\\&= \rm -log [1. 00 \times 10^{-7}\;\rm M ]\\\\&= 7 \end{aligned}\)

Hence, the pH of KOH is 7.0.

Therefore, KOH is basic and NaCl is approximately neutral.

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Answer

I think there should be two poles, a north pole and a south pole. so this statement is wrong

The statement "Cis refers to Z configuration" is True.

In chemistry, the letter "Z" is frequently used as a image to represent the atomic wide variety. The atomic number of an detail shows the range of protons located within the nucleus of an atom. Each element has a completely unique atomic wide variety, which determines its function at the periodic table and distinguishes it from other elements. For instance, hydrogen has an atomic number of one, indicating it has one proton, while oxygen has an atomic quantity of 8, representing eight protons in its nucleus. The atomic quantity plays a essential function in figuring out the chemical properties and conduct of factors. It affects the element's electron configuration, bonding capabilities, and universal reactivity. By know-how the atomic quantity, scientists can are expecting how factors will have interaction with different materials and the way they will form compounds. Therefore, the letter "Z" is generally used as a shorthand notation to symbolize the atomic quantity in chemical equations, formulation, and discussions in the field of chemistry..

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Cis refers to the "Z" configuration. Thus, the statement is true.

In organic chemistry, the term "cis" is used to describe the "Z" configuration. In the context of a double bond, "cis" signifies that the substituent groups are positioned on the same side of the double bond, while "trans" indicates that they are on opposite sides.

Similarly, in a cyclic structure, "cis" denotes that the substituent groups are located on the same face of the ring, whereas "trans" signifies that they are on opposite faces.

The "Z" configuration specifically represents the cis configuration, and it is a notation employed to indicate this arrangement in organic chemistry. On the other hand, the "E" configuration is used to represent the trans configuration.

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The correct question is:-

State whether the statement "cis refers to 'Z' configuration" is true or false.

Answer:

Explanation:

It's radio waves because the higher the frequency, the shorter the wavelength. From crest to crest, the wavelength of a radio wave is the shortest. The longest would be ultraviolet light, then visible light, then microwaves! And since radio waves have the highest frequency out of any of them, it has the shortest, look up photoelectron spectroscopy and you'll see! Hope it helps!

Even if all other elements are at or close to the ideal range of tolerance, the limiting factor principle states that too much or too little of any physical or chemical factor can restrict or prevent population increase. Some species have a remarkable capacity for population growth.

Even when all other elements are at or close to their ideal levels, too much or too little of any physical or chemical factor might stop population increase. This ecological principle, what is it?

Food, water, habitat, and mates are the typical ecological limiting variables. The carrying capacity of an environment will depend on the accessibility of these elements. Demand for food increases along with population growth. Given the scarcity of food, organisms will start vying for it.

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The theory that human beings are experiencing a period of rapid cultural diffusion and mixing of identities, values, and other cultural forms is called cultural convergence.

Cultural convergence refers to the theory that human beings are experiencing a period of rapid cultural diffusion and mixing of identities, values, and other cultural forms.

As a result of globalization, people all over the world are coming into contact with new cultures and ideas that were previously unavailable to them.

This has led to a blending of cultures and the emergence of new cultural forms that incorporate elements from different traditions.

Hence, The theory that human beings are experiencing a period of rapid cultural diffusion and mixing of identities, values, and other cultural forms is called cultural convergence.

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Answer:

in this also 1st option is correct because na is also a metal and metal gains electron...

Answer:

d. forced migration

Explanation:

Certain hazardous occurrences affect living organisms in their natural habitat. One of those occurrences is forest fire. Forest fire or vegetation fire is an uncontrollable break out of fire in a vegetation, affecting the inhabitants of the area.

The occurrence of a forest fire will lead to a forced migration of organisms from their natural habitat. Animals and other mobile organisms will be forced to leave behind their devastating habitat and migrate to a less threatened area in order to survive.

Answer:

D

Explanation:

The guy above is correct but I’m saying this for those who don’t want an explanation

Answer:

Correlation means association - more precisely it is a measure of the extent to which two variables are related. There are three possible results of a correlational study: a positive correlation, a negative correlation, and no correlation.

Explanation:

PLS MARK BRAINLIEST

Answer:

a mutual relationship or connection between two or more things.

Explanation:

"research showed a clear correlation between recession and levels of property crime"

The "Use Relative References" button is a feature in Microsoft Excel that allows users to record a macro that uses relative cell references instead of absolute references. This button is located on the "Developer" tab, which may not be visible by default and needs to be enabled in the Excel Options.

When the "Use Relative References" button is inactive, it is shaded, and the absolute reference is recorded in the macro. When it is active, it is not shaded, and the relative reference is recorded instead.

As for the statement that is not true, based on the information provided above, the statement "the Use Relative References button remains active until you turn it off" is not true. When you stop recording a macro, the "Use Relative References" button automatically turns off, and you need to reactivate it again if you want to use it in the next macro.

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The energy (in J) of 1 mole of the photon is 1.34 x \(10^3\)J.

The energy € of a photon can be calculated using the following equation:

E = hc/λ

Where h is Planck’s constant (6.626 x \(10^{-34}\)J s), c is the speed of light (2.998 x \(10^8\)m/s), and λ is the wavelength of the photon.

First, we need to convert the given wavelength to meters:

8.93 x \(10^{-5}\) m = 8.93 nm

Now we can substitute the values into the equation:

E = (6.626 x \(10^{-34}\) J s) x (2.998 x \(10^8\)m/s) / (8.93 x\(10^{-9}\) m)

Simplifying the equation gives:

E = 2.225 x \(10^{-18 }\)J

This is the energy of one photon. To find the energy of 1 mole of photons, we need to multiply by

Avogadro’s number (6.022 x \(10^{23}\)):

E (1 mole) = (2.225 x\(10^{-18}\) J) x (6.022 x \(10^{23}\))

E (1 mole) = 1.34 x \(10^6\) J/mol

Therefore, the answer is a. 1.34 x \(10^3\) J.

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Answer:

(CH3COO)2 + redP + Cl2 → ClCH2COOH + HCl

Explanation:

This is an example of halogenation of carboxylic acids at alpha carbon atom. In this reaction, red phosphorus and chlorine are treated with carboxylic acids having alpha hydrogen atom followed by hydrolysis to form alpha chloro carboxylic acid.

Answer:

Recessive

Explanation:

Hope this help I think this is the right answer.

Answer:

A.phase of moon

I hope it helps you

A LOAEL is defined as the lowest dose that demonstrates a significant increase in an observable adverse effect. The term LOAEL stands for "Lowest Observed Adverse Effect Level."

When testing chemicals and other substances for toxicity, the goal is to determine the concentration or dose at which adverse effects begin to appear. The LOAEL is the lowest dose at which an adverse effect is observed. This value can be used to establish a safe level of exposure to a substance.
To determine the LOAEL, a series of tests are conducted in which different doses of the substance being tested are administered to test animals. The animals are observed for any adverse effects, such as changes in behavior, weight loss, or organ damage. The lowest dose at which an adverse effect is observed is the LOAEL.
It is important to note that the LOAEL is a relative measure of toxicity. It only provides information on the dose at which an adverse effect is first observed and not on the severity of the effect. In addition, the LOAEL may vary depending on the species tested and other factors.
In summary, the LOAEL is the lowest dose at which an observable adverse effect is detected. This value is used to establish a safe level of exposure to a substance.

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Answer:

5

Explanation:

Answer:

B

Explanation:

well heterogenous mixtures are not uniformly distributed these meaning whatever components are "mixed" can be seperated easily

a example of this can be

Soil, oil in water, ice in water

while Homogeneous mixture cannot be seen seperated

Answer: B. Its components are unevenly distributed.

Explanation:

Explanation:

decentralized multinational corporations, centralised global corporations, international companies, and transnational enterprises.

Answer:

2260 J of heat must be absorbed by the water. Conversely, when 1 g of steam at 100 ºC condenses to give 1 g of water at 100 ºC, 2260 J of heat will be released to the surroundings.

Explanation:

I believe this is correct. :')

The statement that shows an example that demonstrates the reversibility of a chemical change is rotting of eggs (option B).

A chemical change is any process in which reactants are changed into products by the breaking or creation of chemical bonds.

Chemical changes are opposed to physical change, which only affects the form of a chemical substance, but not its chemical composition.

Examples of chemical changes are as follows:

Therefore, it can be said that rotting process of an egg is an example of a reversible chemical change.

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Answer:

Recharging batteries.

I just took the quick check

Explanation:

If your here for the Physical vs. Chemical Change Quick check for Connexus, here are the answers.

1- Dry ice becoming vapor

2-iron (Fe) reacting to water((H2O)) and oxygen(O) to form iron oxide(Fe2O3)

3-conduct a test to determine the chemical makeup of the molecules

4-Atoms of one or more substances rearrange into a new substance.

5-recharging batteries

I took the quick check, and these were the answers!!

                        Hope this helps someone!