Potassium reacted with oxygen. Calculate how many grams of potassium reacted if 28.2g of potassium oxide were formed?​

Answer: Venus is considered the closest planetary neighbor when measuring closest approach, but a new method called the point-circle method may indicate a different closest neighbor when taking time into consideration.

Explanation: Venus is traditionally considered the closest planetary neighbor to Earth due to its closest approach to our planet. However, a new method called the point-circle method, devised by researchers from the University of Alabama, takes time into consideration when measuring distances between planets. This method averages the distance between a bunch of points on each planet's orbit, which may indicate a different closest neighbor. However, this new method is not yet widely accepted and more research needs to be done to confirm its accuracy. It's important to define the term "closest neighbor" in context to avoid confusion.

From this equation, we can see that the mole ratio of FeO to MgO is 1:1. This means that for every one mole of FeO, there is one mole of MgO involved in the reaction.

What is Mole?

In chemistry, a mole is a unit of measurement that represents an amount of substance. It is defined as the amount of a substance that contains the same number of entities (such as atoms, molecules, or ions) as there are atoms in 12 grams of carbon-12. This number is known as Avogadro's number and is approximately equal to 6.022 x 10²³ entities per mole.

The mole is used as a convenient way to express the amount of a substance in chemical reactions and calculations. For example, the stoichiometry of a chemical reaction is expressed in terms of mole ratios, which show the relative numbers of moles of reactants and products involved in the reaction. The concept of mole also allows us to convert between different units of measurement, such as grams and moles, using the molar mass of a substance.

The mole ratio of iron (II) oxide (FeO) and magnesium oxide (MgO) can be determined from the balanced chemical equation for the reaction between these two compounds. The balanced equation is:

FeO + MgO → Fe + Mg

From this equation, we can see that the mole ratio of FeO to MgO is 1:1. This means that for every one mole of FeO, there is one mole of MgO involved in the reaction.

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Answer:

The amount of acid rain caused by the burning of fossil fuels can be reduced by creating nitrogen oxides in the process of burning coal and other fossil fuels, some power plants are changing the way they burn coal. A great way to reduce acid rain is to produce energy without using fossil fuels. Instead, people can use renewable energy sources, such as solar and wind power.

Answer: 4.NH4CI

Explanation:

According to Reference Table G, the substance which is most soluble at 60°C is:

This refers to the ability of a solution to be able to be dissolved in liquid which is usually done when temperature is increased.

With this in mind, we can see that from the complete question, we can see that there is the presence of different mixtures and when put at the specific temperature of 60°C, NH4CI was the most soluble.

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The curve represents saturation. Below the curve, the water is unsaturated. Above the curve, water is supersaturated. This means that more solute is present than the water can contain.

The line of the solubility curve indicates that the solution is saturated. A saturated solution is defined as a solution in which 100 g of solute is dissolved in 100 g of water. Simulations below this line indicate unsaturated solutions.

The difference between unsaturated and saturated solutes can be determined by adding very small amounts of solute to the solution. In unsaturated solutes, solutes will dissolve, and solutes in saturated solutes will not dissolve. In saturated solutes, crystals will form very quickly around the added solute.

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The sawtooth pattern observed in the two-year chart of carbon dioxide measurements from Mauna Loa, Hawaii, is a result of seasonal variations and human activities.

Carbon dioxide levels increase during the winter months when plants are dormant and decrease during the summer months when they are actively photosynthesizing. Additionally, human activities such as burning fossil fuels and deforestation contribute to the overall increase in carbon dioxide levels. The sawtooth pattern provides valuable data for scientists studying the impacts of climate change and global warming. It also serves as a reminder of the urgent need to reduce carbon emissions and adopt sustainable practices to mitigate the effects of climate change.

The sawtooth pattern observed in the two-year chart of carbon dioxide (CO2) measurements from Mauna Loa, Hawaii, is primarily due to seasonal fluctuations in plant growth and decay. During spring and summer, increased photosynthesis in the Northern Hemisphere absorbs CO2 from the atmosphere, causing a decrease in CO2 levels. Conversely, during fall and winter, reduced photosynthesis and increased plant decay release CO2 back into the atmosphere, resulting in a rise in CO2 levels. This cyclical pattern creates the sawtooth appearance on the chart, while the overall trend still shows a continuous increase in atmospheric CO2 levels due to human activities.

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Answer:

High amount of humidity

Explanation:

This is especially common in the Caribbean, where hot temperatures very moisture and warm air provide near-ideal circumstances for hurricane formation, as assessed by the Saffir-Simpson classification and the Power Distribution Index.

"Hurricanes may originate everywhere in the Atlantic basin, from the subtropical central Atlantic to the Gulf coast. However, in order to make this all the way to the West Coast of the United States, the storms must pass over a lengthy length of sea water which is far too small to support hurricanes.

The storm strength is influenced by a lot of factors. Due to world warms and increase in the amount of humidity.

What is causing the increase in storm strength?

Studies has shown due too the warming of the world, hurricanes and other tropical cyclones are said to be more stronger.

This is due to the fact that warmer water gives more of the energy that boast storms. A rise in stronger hurricanes is due to warming never ending.

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Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl

To calculate the concentration of NaCl in the resulting solution in mg/L NaCl, we can use the formula; Concentration (mg/L) = (Mass of solute ÷ Volume of solution in L) × 1000 g / 1 mg NaCl is present in the stock solution of 25 mL. So, the mass of NaCl in the solution would be;0.0842 g ÷ 25 mL = 0.00337 g/mL. Now, in the resulting solution, a 1.00 mL aliquot of the stock solution is transferred to a 50.00 mL volumetric flask and diluted to volume. Therefore, the volume of the resulting solution is 50.00 mL. We will substitute these values in the formula, Concentration (mg/L) = (0.00337 g/mL ÷ 50 mL) × 1000 g / 1 mg concentration (mg/L) = 67.4 mg/L. Therefore, the concentration of NaCl in the resulting solution in mg/L NaCl is 67.4 mg/L.7.  Concentration = 67.4 mg/LTolerance = 4.28 mg/LTotal concentration = 67.4 + 4.28 mg/L = 71.68 mg/LWe round off this value to one decimal place; Total concentration = 71.7 mg/LTherefore, the concentration of NaCl in the resulting solution using propagation of error through the calculation is 67.4+0.4 mg/L.8. Two possible sources of random (indeterminate) error in the experiment are; Errors in temperature measurement. Errors in measurement of water volume. Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl.

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Answer: Yes because that's when they form a compound

Answer:

LI

Explanation:

There is three Li in the start but One Li after

Approximately 12,083.33 mL of the water sample contains 145 mg of Pb.

To calculate the amount of water (in mL) that contains 145 mg of Pb, we need to use the given information that the water sample contains 0.0012% Pb by mass.

First, we need to find the mass of the entire water sample. Let's assume the mass of the water sample is 1 gram (1000 mg) for ease of calculation.

Since the water sample contains 0.0012% Pb by mass, we can calculate the mass of Pb in the water sample by multiplying the mass of the water sample by 0.0012%.

Mass of Pb = 0.0012% x 1000 mg = 0.012 mg

Next, we can set up a proportion to find the volume of water (in mL) that contains 145 mg of Pb:

Mass of Pb / Volume of water = Mass of Pb in the given water sample / Volume of the given water sample

145 mg / x mL = 0.012 mg / 1 mL

Cross-multiplying, we get:

145 mg x 1 mL = 0.012 mg x x mL

145 = 0.012x

Solving for x:

x = 145 / 0.012

x ≈ 12,083.33 mL

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Answer:

C

Explanation:

Answer:

Part a)

No Reaction

Part b)

CaNO3 is formed

Explanation:

Part a)

Silver is less reactive than lead and hence when Ag metal is added to a Pb(NO3)2 solution there will be no reaction

Ag (s) + Pb(NO3)2 (aq) --> Ag (s) + Pb(NO3)2 (aq)

Part b)

Calcium is more reactive than silver and hence when calcium is added to the solution of AgNO3, it will replace Ag from the AgNO3 and itself form compound with NO3 2- ion.

The reaction for the same is

Ca (s) + AgNO3 = CaNO3 + Ag (s)

Explanation:

The first law of Thermodynamics states that energy cannot be created nor destroyed,but it can be transferred. This law is referred to as The law of Conservation of Energy

Based on the description of the graph, the law that is based on it is A. Boyle's law.

Boyle's law states that, at a constant temperature, the pressure and volume of a gas are inversely proportional to each other. In other words, as the volume of a gas decreases, the pressure increases, and vice versa, when the temperature remains constant.

The graph described shows a curve that starts high on the horizontal axis (indicating a large volume) and curves toward the origin, indicating a decrease in volume. As the volume decreases, according to Boyle's law, the pressure of the gas would increase. The leveling out of the curve as it approaches the horizontal axis suggests that there is an equilibrium point where the pressure and volume have stabilized.

Therefore, the graph aligns with the behavior predicted by Boyle's law, which establishes the inverse relationship between pressure and volume for a given amount of gas at a constant temperature. Therefore, Option A is correct.

The question was incomplete. find the full content below:

Which law is based on the graph that is shown below?

A graph is shown with pressure on the horizontal axis and volume on the vertical axis. A curve starts high on the horizontal axis, curves toward the origin, and then starts to level out as it approaches the horizontal axis.

A. Boyle’s law

B. Charles’s law

C. Dalton’s law

D. Gay-Lussac’s law

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Answer:

The number of outer shell electrons determines the group number of the element. The number of occupied principle quantum shells (energy levels) determines the period of the element. The proton number determines the element itself and its position.

Explanation:

In muscle function at the sarcomere level, the regulation of cross-bridge formation is dependent on the binding of calcium ions to the protein troponin. Hence, the correct answer is B. calcium; troponin.

In muscle function at the sarcomere level, the formation of cross-bridges between actin and myosin filaments is regulated by the binding of calcium ions to troponin. Troponin is a regulatory protein complex that is associated with the actin filaments in the sarcomere. When calcium ions bind to specific binding sites on troponin, it causes a conformational change in the troponin-tropomyosin complex. This conformational change exposes the active sites on actin, allowing the myosin heads to bind to actin and form cross-bridges. This interaction between actin and myosin leads to muscle contraction.

Sodium ions do not directly regulate the formation of cross-bridges in muscle function. Tropomyosin is a structural protein that is involved in covering the binding sites on actin in the absence of calcium. However, it is the binding of calcium ions to troponin that initiates the conformational change in the troponin-tropomyosin complex, allowing the cross-bridge formation and muscle contraction to occur.

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Answer: Id answer it but i think your copy and paste got corrupted!

Explanation:

The number of residues separated amino acids that are stabilized by hydrogen bond in α helices is 3.6 amino acids residue.

When the  two or more amino acid combine to form a peptide and the water is removed then the remain of each amino acid is called amino - acids residue.

The amino group of one amino acid interacts with carboxyl group of other amino acid  to form peptide bond.

The α helix is stabilized by hydrogen bonds between the carbonyl oxygen  and amino group of every third residue in the helical turn and with each helical turn consists 3.6 amino group.

Thus, alpha - helices have 3.6 amino acids residue per turn. This means that helix 36 amino acids long form 10 turns.

Therefore, number of residues separated amino acids that are stabilized by hydrogen bond in α helices is 3.6 amino acids residue.

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The orbitals are accountable to the law of octaves are: 1s 2s 2p 2p 3s 3p 3d  4s 4p 4d 5s 5p 4f 5d 6s 6p 5f 6d 7s .

The law of octaves introduced by the English chemist named J.A.R Newlands. According to it if we arranged the chemical elements in the periodic table according to their atomic mass then those that have the similar physical and the chemical properties will occur after the each interval of the seven elements.

The last element that is known was the thorium with the atomic mass of 232. Newlands' law of octave was firstly applicable only up to the calcium with atomic mass of 40. Now there are more ninety elements known up to the thorium.

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The salt CaCl2 (calcium chloride) and water (H2O) are formed in this reaction. Also formed is the gas carbon dioxide (CO2) which may cause a bloated feeling in the stomach. The acid that is secreted in your stomach is approximately 0.1 M (moles per liter) hydrochloric acid.

I hope it helps ●~●

The reaction you've mentioned is a steam methane reforming process, which is one of the common methods for producing hydrogen gas (H2) on an industrial scale. In this process, methane gas (CH4) reacts with water vapor (H2O) to produce carbon monoxide gas (CO) and hydrogen gas.

The balanced chemical equation for the reaction is:

CH4(g) + H2O(g) → CO(g) + 3H2(g)

In the steam methane reforming process, methane and water vapor are typically reacted in the presence of a catalyst at high temperatures. The reaction requires heat input and is an endothermic process.

The methane (CH4) from sources such as natural gas or biogas serves as the primary feedstock for hydrogen production through steam methane reforming. Water vapor (H2O) is introduced into the system, and in the presence of heat and a catalyst, the methane and water vapor undergo a series of reactions to yield carbon monoxide (CO) and hydrogen gas (H2).

Hydrogen produced through this process can be used as a clean fuel source in various applications, including powering hydrogen-fueled cars and fuel cell vehicles. Hydrogen-powered cars utilize fuel cells to convert hydrogen into electricity, generating power for the vehicle's motor. This process produces only water as a byproduct, making it a promising alternative to conventional combustion engines that produce greenhouse gases.

It's important to note that while hydrogen gas is a clean and potentially sustainable energy carrier, the overall environmental impact and sustainability of hydrogen production depend on the source of methane and the method of obtaining hydrogen. Various other methods, including electrolysis of water using renewable energy sources, are also being explored for hydrogen production to minimize reliance on fossil fuels.

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The period 2 element which has IE similar to the data provided to us is Boron.

To remove the lost electron, the least amount of energy is needed. A bigger amount of energy is needed to remove an electron if it is nearer the nucleus.

The stability of the valance shell causes an increase in ionization energy if we move our gaze from left to right over time.

According to the given data,

IE₁ = 801

IE₂ = 2427

IE₃ = 3659

IE₄ = 25,022

IE₅ = 32,822

To determine the electron configuration, we need to consider the Aufbau principle, which states that electrons fill the lowest energy levels available before moving to higher energy levels. The electron configuration can be written as follows:

1s² 2s² 2p¹

This electronic configuration indicates the element is Boron.

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Answer:

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Answer:

He source of starting materials for synthetic polymers is primarily petroleum and natural gas.

Explanation:

The primary source of starting materials for synthetic polymers is petroleum and natural gas. These fossil fuels contain hydrocarbon molecules that serve as the building blocks for the production of various synthetic polymers. The process involves extracting and refining crude oil and natural gas to obtain the desired hydrocarbon compounds, which are then used as feedstocks in polymer synthesis.

Petroleum-based starting materials, such as ethylene and propylene, are extensively used in the production of polymers like polyethylene and polypropylene, respectively. These polymers have a wide range of applications, including packaging materials, plastic bags, bottles, and various other plastic products.

While plants can be a source of some natural polymers, such as cellulose or starch, which are used in applications like paper, textiles, and biodegradable packaging, they are not the primary source for the production of synthetic polymers. Synthetic polymers, which account for a significant portion of the plastics and synthetic materials used in modern society, are primarily derived from petroleum and natural gas feedstocks.

Recycled plastics (option C) can be used as a secondary source of materials for polymer production. By recycling and processing used plastic products, the plastic can be reprocessed and used as a feedstock in the production of new polymers. However, recycled plastics currently make up a relatively smaller proportion of the overall raw materials used for synthetic polymers.

Animals (option D) are not a significant source of starting materials for synthetic polymers. While certain natural polymers, such as collagen or keratin, are derived from animal sources, they are not commonly used as feedstocks for the production of synthetic polymers on a large scale.

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Answer:

390.6 gram

Explanation:

Mass in gram = no of moles × molar mass

Mass in gram = 21.7×18

= 390.6 gram

Answer:

390.931576 grams

Answer:

Explanation:

The first thing that you need to do here is to calculate the theoretical yield of the reaction, i.e. what you get if the reaction has a

100

%

yield.

The balanced chemical equation

N

2

(

g

)

+

3

H

2

(

g

)

→

2

NH

3

(

g

)

tells you that every

1

mole of nitrogen gas that takes part in the reaction will consume

3

moles of hydrogen gas and produce

1

mole of ammonia.

In your case, you know that

1

mole of nitrogen gas reacts with

1

mole of hydrogen gas. Since you don't have enough hydrogen gas to ensure that all the moles of nitrogen gas can react

what you need



3 moles H

2

>

what you have



1 mole H

2

you can say that hydrogen gas will act as a limiting reagent, i.e. it will be completely consumed before all the moles of nitrogen gas will get the chance to take part in the reaction.

So, the reaction will consume

1

mole of hydrogen gas and produce

1

mole H

2

⋅

2 moles NH

3

3

moles H

2

=

0.667 moles NH

3

at

100

%

yield. This represents the reaction's theoretical yield.

Now, you know that the reaction produced

0.50

moles of ammonia. This represents the reaction's actual yield.

In order to find the percent yield, you need to figure out how many moles of ammonia are actually produced for every

100

moles of ammonia that could theoretically be produced.

You know that

0.667

moles will produce

0.50

moles, so you can say that

100

moles NH

3

.

in theory

⋅

0.50 moles NH

3

.

actual

0.667

moles NH

3

.

in theory

=

75 moles NH

3

.

actual

Therefore, you can say that the reaction has a percent yield equal to

% yield = 75%

−−−−−−−−−−−−−

Consider if the reaction is conducted with 3 moles of hydrogen and 2 moles of nitrogen as it in the balanced reaction, and if only 4.1 g of ammonia is produced, then the percent yield will be 12%.

The ratio of  the actual yield to the theoretical yield multiplied by 100 is the percent yield. No simple reactions can achieve a 100 % yield.

As per the given reaction, 3 moles of hydrogen reacts with 2 moles of nitrogen and produce 2 moles of ammonia. Molar mass of ammonia is 17 g/mol. Thus, 2 moles are 34 g/mol.

Assume that if the theoretical yield is 34 g, then the percent yield for actual yield of  4.1 g is,

4.1 /34 ×100 = 12.1 %.

Now lets assume that only one mole of hydrogen is reacted here, number of moles of ammonia produced by one mole of hydrogen is :

=  1 mole × 2 mol / 3 moles

= 0.66 moles.

0.66 moles = 0.66 × 17 g/mol = 11.22 g.

For a theoretical yield of 11.22 g, the percent yield will be

= 4.1 /11.22

= 36.6 %.

Therefore, by assuming if 3 moles of hydrogen are reacted then percent yield will be 12% for 4.1 g of actual yield and 36 % if only one mole of hydrogen is reacted.

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Answer: A.

Explanation: When light passes through a small hole, it creates an inverted image on the opposite side. In this case, since the arrow is pointing up, the inverted image will appear pointing down on the opposite wall. Furthermore, since the box has a hole on its left side, the inverted image will be shifted towards the left.

Fluorine is the most electronegative among the group and tends more to gain an electron by chemical bonding. For the same reason, fluorine is more reactive than bromine. magnesium is more reactive than calcium because, Ca contains more inner electrons and experience shielding effect.

Electronegativity is the ability of an atomic nucleus to attracts its own electrons as well as the bonded electrons. Fluorine has the  highest electronegativity than any element in periodic table.

F is more prone to be reactive since it needs gain an electrons to achieve stability. Cl has the same number valence electrons and but it contains more inner electron which shield each other. The most electronegative F will be more reactive in the group. For the same reason F is more reactive than Br also.

Potassium is more reactive than lithium because, potassium contains more loosely bound electron in its valence shell. Hence, it can be easily lose that electron through chemical bonding.

Magnesium is less reactive than Ca because, its valence electrons are more close to the nucleus. Whereas, Ca has one more shell in which the valence electrons are located which can be easily participated in bonding.

Similarly, oxygen is more reactive than sulfur, because, oxygen is highly electronegative and it tends to gain  two electrons by reaction.

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