366 Cal to kilowatt-hours, how to convert?

Answer:

well done. I hope it's helpful

Explanation:

density= mass/v

density of Al= 40.5 gram/ 18mL

= 2.25 gr/mL

Answer:

Probably because there is more helium to burn. After billions of years there's only gonna be helium so no more of that firey energy.

I think....

Answer:

total displacement \time

Explanation:

Answer:

Isabelle is taking a survey to find the most popular music group of students in her community. Which of these is not a way for her to get a representative sample of this information?

 ask every tenth student she sees ac a concert

 ask every fifth student entering her school in the morning

 ask every third student she encounters at the mall

 ask every student at a local movie theater

Explanation:

Answer: 55.7 moles of \(H_2O\) are needed to produce the given amount of \(H_2\)

Explanation:

The number of moles is defined as the ratio of the mass of a substance to its molar mass.

The equation used is:

\(\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}\) ......(1)

Given values:

Moles of \(H_2\) = 55.7 moles

The chemical equation for the decomposition of water follows:

\(2H_2O\rightarrow 2H_2+O_2\)

By the stoichiometry of the reaction:

If 2 moles of hydrogen gas is produced from 2 moles of water

So, 55.7 moles of hydrogen gas will be produced by = \(\frac{2}{2}\times 55.7=55.7mol\) of water

Hence, 55.7 moles of \(H_2O\) are needed to produce the given amount of \(H_2\)

Taking into account the reaction stoichiometry,

In first place, the balanced reaction is:

2 H₂O → 2 H₂ + O₂

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 following rule of three can be applied: if by reaction stoichiometry 2 moles of H₂ are produced from 2 moles of H₂O, 55.7 moles of H₂ are produced from how many moles of H₂O?

\(moles of H_{2} O=\frac{55.7 moles of H_{2}x 2 moles of H_{2} O}{2 moles of H_{2}}\)

moles of H₂O= 55.7 moles

Finally, 55.7 moles of H₂O is requiredto produce 55.7 moles of H₂.

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Answer:

See explanation below

Explanation:

When the bromine (Br₂) reacts in presence of FeBr₃ with the isopropylbenzene, the isopropylbenzene is a ring activator, therefore, it will promote the substitution in the ortho and para positions. However, as the Isopropyl is voluminic, the ortho position would have steric hindrance and hence, this product is not formed in greater proportions. Instead, the para position becomes more available to reaction, and this product is formed in majority.

The mechanism of reaction can be seen in the following picture, along with the products of the reaction

Hope this helps

Answer:

"The last digit in any number is referred to as the estimated digit."

Explanation:

So it should be 2

Answer:

To calculate the percent yield, we need to divide the actual yield (250 L) by the theoretical yield (in liters) and then multiply by 100%.

Percent Yield = (actual yield / theoretical yield) x 100%

So, if we know the theoretical yield of CO2 in liters and we want to calculate the percent yield of 250L of CO2 collected as the actual yield, we need to insert the theoretical yield in the equation.

For example, let's assume that the theoretical yield of CO2 is 350L.

Percent Yield = (250 L / 350 L) x 100% = 71.42%

This is close to option A) 72%. So, The percent yield of 250L of CO2 collected for the actual yield is 72%

Keep in mind that this is a theoretical example and the actual yield percentage will vary depending on the reaction and the experimental conditions.

Explanation:

Answer:

B. Non-metals

Explanation:

The element with the atomic number of 17 is Cl.

Chlorine belongs to the group 7 in the periodic table. It is a non metal.

Correct option: B. Non-metals

Answer:

The exact number of acetylcholine (ACh) molecules required to completely activate the cholinergic nicotinic receptor depends on several factors, including the receptor density, affinity of the receptor for ACh, and the efficiency of the receptor activation process.

 Cholinergic nicotinic receptors are ligand-gated ion channels found in the nervous system that respond to the neurotransmitter acetylcholine (ACh). The activation of these receptors occurs when ACh molecules bind to specific binding sites on the receptor.

  The exact number of ACh molecules required for full receptor activation can vary and is influenced by multiple factors. One crucial factor is the receptor density, which refers to the number of receptors present on the cell surface. Higher receptor density would require more ACh molecules to engage and activate a larger number of receptors.

  Additionally, the affinity of the receptor for ACh plays a role. Affinity refers to the strength of the binding interaction between ACh and the receptor. Receptors with higher affinity for ACh will require fewer ACh molecules to achieve activation compared to receptors with lower affinity.

  Furthermore, the process of receptor activation can be cooperative, meaning that the binding of one ACh molecule can facilitate the binding of additional ACh molecules to nearby receptor sites. Cooperative binding can increase the overall efficiency of receptor activation and reduce the number of ACh molecules required for full activation.

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Answer:

Volume is 0.0247L

Explanation:

This question involves the use of Boyle's law which states that the volume of a given mass of gas is inversely proportional to it's pressure provided that temperature remains constant.

Mathematically,

v = k/p

K = VP

P1V1 = P2V2 = P3V3 = .........=PnVn

V = volume

p = pressure

Data;

P1 =1.0atm

V1 = 1.73L

P2 = 70atm

V2 = ?

P1V1 = P2V2

V2 = P1V1 / P2

V2 = (1.0×1.73)/70

V2 = 0.0247L

The volume of the sample is 0.0247L

The D-Aldo triose is a type of sugar molecule that belongs to the family of trioses, which are three-carbon sugars. There are two possible stereoisomers of Aldo triose: D-Aldo triose and L-Aldo triose. D-Aldo triose has all three hydroxyl groups (-OH) on the same side of the carbon chain, while L-Aldo triose has them on alternating sides.

To check all D-Aldo triose, we need to consider the stereochemistry of each possible Aldo triose molecule. There are two D-Aldo triose isomers: D-glyceraldehyde and D-erythrose. D-glyceraldehyde has a -CHO group (aldehyde group) at one end of the carbon chain and a -CH2OH group (hydroxymethyl group) at the other end. The remaining carbon has a -OH group attached. This gives D-glyceraldehyde the chemical formula C3H6O3. D-erythrose has two -OH groups and one -CHO group, with the -CHO group at one end of the carbon chain and the two -OH groups at the other end. This gives D-erythrose the chemical formula C4H8O4. Therefore, to check all D-aldotriose, we need to examine the chemical structures of D-glyceraldehyde and D-erythrose and verify that they meet the criteria for being D-aldotriose isomers. Once we have confirmed their stereochemistry, we can conclude that these are the only two D-Aldo triose isomers that exist.

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The refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

To calculate the kilowatt-hours (kWh) of electric energy used by the refrigerator in 30 days, we need to multiply the power rating by the total running time.

Given:

Power rating of the refrigerator = 500 W

Running time per day = 12 hours

Number of days = 30

First, we need to convert the power rating from watts to kilowatts:

Power rating = 500 W / 1000 = 0.5 kW

Next, we calculate the total energy used in kilowatt-hours (kWh) over the 30-day period:

Energy used = Power rating × Running time × Number of days

Energy used = 0.5 kW × 12 hours/day × 30 days

Energy used = 180 kWh

Therefore, the refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

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Answer:

6FCRXCTV

Explanation:

Answer:

b

Explanation:

a p e x

The Lewis dot structure for water is H-O-H. The oxygen atom has a partial negative charge, while the hydrogen atoms have partial positive charges.

Structure is the arrangement of components within a system or object. It is the way in which individual parts are organized to form a whole. Structures can be physical, such as a building, or intangible, such as a system of government or an organization. Structures provide an orderly arrangement of components and help to keep the system functioning properly. By designing structures that are efficient, stable, and able to withstand external forces, engineers and architects are able to create safe and reliable structures.

The Lewis dot structure for ethanol is C-H-O-H. The oxygen atom has a partial negative charge, while the carbon and hydrogen atoms have partial positive charges.

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Answer:

1- Environmental Value System or EVS is a worldview that molds the way both individuals and the societies they form perceive and therefore evaluate environmental concerns.

2-Entropy/ the measure of a system's thermal energy per unit temperature that is unavailable for doing useful work.

3-Equilibrium/a state of balance between opposing forces or actions that is either static

4-Feedback/a return of information about a result or the returned portion of a process.

5-Feedback,negative/ is a self-regulatory system in which it feeds back to the input a part of a system's output so as to reverse the direction of change of the output.

6-Feedback,positive/ is the amplification of a body's response to a stimulus.

7-Gaia/ all organisms and their inorganic surroundings on Earth are closely integrated to form a single and self-regulating complex system

8-Model/a physical and/or mathematical and/or conceptual representation of a system of ideas, events or processes.

Answer:

Negative

Explanation:

Any atom gaining electrons will get a negative change since the charge of the electron is negative.

The answer is B 12.5g

The answer is that all of the following changes to Earth's atmosphere would increase the greenhouse effect: increasing the concentrations of carbon dioxide, methane, nitrous oxide, and other greenhouse gases; reducing the amount of aerosols in the atmosphere; and decreasing the amount of clouds in the atmosphere.

Increasing the concentrations of greenhouse gases such as carbon dioxide, methane, and nitrous oxide traps more heat in the atmosphere, leading to an increase in the greenhouse effect.

Reducing the amount of aerosols in the atmosphere also increases the greenhouse effect, as aerosols can act as a cooling agent and reduce the amount of heat that is trapped in the atmosphere.

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Answer:

chemical energy

Explanation:

A battery stores energy in the form of chemical energy. Chemical energy is stored in the bond of atoms and molecules. These bonds break and convert to other forms of energy. In the given case, the chemical energy is converted to electric energy which powers the flashlight. Thus, flashlight receives energy input in the form of chemical energy.

Answer:

the 3rd option. negative feedback loops are initiated during childbirth.

Answer:

asxrsse367721479009qqucinübjpnpnfzdh ilo h

Answer:A single bond is a chemical bond between two atoms in which they share one pair of electrons. This is the simplest type of covalent bond, and it is formed when two atoms need to complete their outer electron shells by sharing a pair of electrons. The sharing of these electrons creates a stable molecule by balancing the electrostatic forces between the positively charged atomic nuclei and the negatively charged electrons. Single bonds can be found in many molecules, such as HCl, H2O, and CH4. They are typically weaker than double or triple bonds, which involve the sharing of two or three pairs of electrons, respectively.

Answer:

The time you will get to Atlantic City is 3 pm

Explanation:

Given;

speed limit, v = 50 km/h

distance to be traveled, d = 150km

The time of the motion is given as;

time = distance / speed

t = (150 km) / (50 km/h)

t = 3 hours

Thus, if you leave your home at noon, the time you will get to Atlantic City is given as;

time to get home = 12 pm + 3hours = 3 pm

Therefore, the time you will get to Atlantic City is 3 pm

Unsaturated solution: a solution in which more solute can be dissolved.

Explanation:

Salt dissolved in water or even sugar dissolved in water is an unsaturated solution if the quantity of dissolved salt/sugar is below the saturation point.

unsaturated solution: a solution in which more solute can be dissolved.

Explanation:

A solution in which the maximum amount of solvent has been dissolved. Any more solute added will sit as crystals on the bottom of the container.

The element Rhenium is an inner transition element having 75 electrons, 75 protons and 111 neutrons.

The element rhenium is one of the elements that belongs to the inner transition series. The element is known to have total 75 electrons, 75 protons and 111 neutrons. The relative atomic mass of the element have been placed at 186 g/mol.

The element is known to be massive and does form very massive complexes. The complexes of rhenium are very useful in industry. The models of the atom have helped to show the arrangement of the electrons, protons and neutrons in the element.

The protons are positively charged and they are found in the nucleus while the electrons are found shells and are negatively charged. The neutrons in the atom have no charge.

The four fundamental forces are metallic forces that holds atoms of metals together. The ionic bond that holds ions together, the covalent bond that holds atoms together in molecules and the dative bonds that leads to the formation of coordinate compounds.

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The formula unit of compound made up from Pb4+ and oxygen is PbO2.

The formula unit for a compound made from Pb⁴⁺ and oxygen is PbO₂. Therefore, option (1) is correct.

A formula unit represents the lowest whole number ratio of ions in an ionic compound. The formula mass of a substance is the sum of the atomic masses of the ions present in the formula unit of an ionic compound.

Formula unit is the empirical formula of any covalent or ionic solid compound which is used as an independent entity for stoichiometric calculations. Formula mass is also defined as the sum of atomic masses of constituent atoms in an ionic compound.

A molecule is made up of two or more elements that are covalently bonded. Also, the molecular mass gives the mass of a molecule relative to that of a carbon twelve atom which has a mass of twelve units.

As we know the valency of lead is 4 and the valency of oxygen is 2. To satisfy the valency of each other two oxygen combine with one lead (IV). Therefore, the formula unit of the compound is PbO₂.

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If the experiment comparing the tension bond strength of polymer latex modified mortar to that of unmodified mortar resulted in X = 18.12 kgf/cm2

for the modified mortar (m = 40) and Y = 16.87 kgf/cm2 for the unmodified mortar, the analysis and conclusion of part (a) would change.

Specifically, the conclusion that the polymer latex modified mortar has a higher tension bond strength than the unmodified mortar may no longer be valid. This is because the new data suggests that the tension bond strength of the two types of mortar is not significantly different.

It is important to note that this conclusion is based solely on the provided data, and further analysis may be necessary to fully evaluate the significance of these results.

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