What is the predicted order of first ionization energies from highest to lowest for lithium (Li), sodium (Na), potassium (K), and rubidium (Rb)?
Rb > K > Na > Li
K > Rb > Na > Li
Li > Na > K > Rb
Rb > K > Li > Na

The new pressure of the gas is 8.40 x \(10^3\) torr.

The new pressure of the gas can be calculated using the combined gas law equation, which states that the product of the initial pressure, initial volume, and initial temperature is equal to the product of the final pressure, final volume, and final temperature.

To solve for the new pressure, we can rearrange the equation to solve for the final pressure (P2):

(P1 x V1 x T2) / (V2 x T1) = P2

Given:
P1 = 710. torr (initial pressure)
V1 = 4.8 x 10^2 mL (initial volume)
T1 = 30.°C + 273.15 (initial temperature in Kelvin)
V2 = 26 mL (final volume)
T2 = 820.°C + 273.15 (final temperature in Kelvin)

Let's plug in the values into the equation and solve for P2:

P2 = (710. torr x 4.8 x \(10^2\) mL x (820.°C + 273.15)) / (26 mL x (30.°C + 273.15))

P2 = (710. torr x 4.8 x \(10^2\) mL x 1093.15 K) / (26 mL x 303.15 K)

P2 = (7.68 x \(10^5\) torr x 1093.15 K) / (7957.9 K x mL)

P2 = 8.40 x \(10^3\) torr

Therefore, the new pressure of the gas is 8.40 x \(10^3\) torr.

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Answer:

whats the question so i can answer?

Answer: The heat absorbed by the water is 52.823 J.

Explanation:

Given: Mass of metal = 5.05 g

Specific heat of water = 4.184 \(J/g^{o}C\)

Initial temperature = \(24.8^{o}C\)

Final temperature = \(27.3^{o}C\)

Formula used to calculate heat absorbed is as follows.

\(q = m \times C \times (T_{2} - T_{1})\)

where,

q = heat

m = mass of substance

\(T_{1}\) = initial temperature

\(T_{2}\) = final temperature

Substitute the values into above formula as follows.

\(q = m \times C \times (T_{2} - T_{1})\\= 5.05 g \times 4.184 J/g^{o}C \times (27.3 - 24.8)^{o}C\\= 52.823 J\)

Thus, we can conclude that heat absorbed by the water is 52.823 J.

Answer: The situation was Alexander Fleming made an experiment showing that the fungus produced a chemical that could kill bacteria. The scientific knowledge was based off Fleming's work, scientists produced the first antibitoic drugs.

It should reanalyze the data to determine whether their results contradicted your hypothesis if the experiment's findings did not support it. So shouldn't change the experiments, observations, or both in order to get results that support the theory.

An assumption or concept is given as a hypothesis for the purpose of debating it and testing if it might be true.

If the facts continually contradict the hypothesis, it is obvious that the hypothesis is not a viable explanation for the phenomenon you are examining. The proposed explanation is disproved, and we now look for a fresh hypothesis to explain the experimental results.

If the results confirm the prediction, the hypothesis is supported. Results can be used to disprove the hypothesis if the prediction was not confirmed by the data. By monitoring data and creating a new hypothesis using the new facts, you might need to come up with new questions. Make a finding and a forecast.

Thus, It should reanalyze the data to determine whether their results contradicted your hypothesis if the experiment's findings did not support it.

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A neutral atom of on element has two electrons with n=1, eight electrons with n=2, eight electrons with n=3 and one electron with n =4 and has mass number of 39 then the atomic number of element is 39 and number of neutron in the nucleus is 50 and total number of s electron is 2 and total number of p electron is 8 and the group is 3rd group

Yttrium is a metallic element with atomic number 39 usually included in the rare earth group that occur usually with other rare earth element in minerals and is used especially in phosphorous and YAG laser and alloy etc and element with mass number of 39 is yttrium and the atomic number of element is 39 and number of neutron in the nucleus is 50 and total number of s electron is 2 and total number of p electron is 8 and the group is 3rd group

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Answer:

The more concentrated acetic acid buffer has a better buffer capacity because requires more moles of acid or base to change the pH than a more diluted acetic acid buffer.

Explanation:

Buffer capacity is defined as the moles of an acid or base that are needed to change the pH of a buffer in 1 unit.

A more concentrated solution of acetic buffer contains more moles of the acid per liter of solution. A solution that contains more moles of the acetic ion or the acetic acid requires more moles of base or acid to change the pH, that means:

The more concentrated acetic acid buffer has a better buffer capacity because requires more moles of acid or base to change the pH than a more diluted acetic acid buffer.

The empirical formula of polyethylene can be determined by converting the given percentages of carbon (C) and hydrogen (H) into grams. To find the grams of each element, we assume a 100.0 g sample of polyethylene.

For carbon:

Mass of carbon = 86.0% × 100.0 g = 86.0 g

For hydrogen:

Mass of hydrogen = 14.0% × 100.0 g = 14.0 g

Therefore, in a 100.0 g sample of polyethylene, there are 86.0 grams of carbon and 14.0 grams of hydrogen.

The empirical formula of a compound represents the simplest whole-number ratio of atoms present in the compound. To determine the empirical formula, we need to find the ratio of carbon to hydrogen in terms of moles.

First, we convert the masses of carbon and hydrogen into moles using their respective molar masses. The molar mass of carbon is approximately 12.01 g/mol, and the molar mass of hydrogen is approximately 1.008 g/mol.

Number of moles of carbon = 86.0 g / 12.01 g/mol ≈ 7.162 mol

Number of moles of hydrogen = 14.0 g / 1.008 g/mol ≈ 13.89 mol

Next, we divide the number of moles of each element by the smallest number of moles to get a simplified ratio.

Carbon: Hydrogen ≈ 7.162 mol : 13.89 mol ≈ 1 : 1.939

Since we want to express the ratio in whole numbers, we multiply both sides by 2 to get a whole number ratio.

Carbon: Hydrogen ≈ 2 : 3.878

Rounding to the nearest whole number, we find that the empirical formula of polyethylene is CH₂.

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When you think about whether most people are basically good or basically

bad, you are exploring your own beliefs.

therefore, according to the above-explained points, the above statement justifies the point of exploring your own beliefs.

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Answer:

1. Conductors (Yes) : Li, Ca, Mg, Mn, V, Sc, Y, Na, K

a) Energy level 2 = Li

b) Energy level 3: Na, Mg

b. (i) One valence electron = Na

b. (ii) Two valence electrons = Mg

2. Conductors (No) : Br, I, S, As, Sb

a) Energy level 3 = S

b) Energy level 4: Br, As

b. (i) Seven valence electrons = Br

b. (ii)Five valence electrons = As

Explanation:

Conductors are elements which are able to conduct heat and electricity easily. They are usually metallic elements.

From the list of elements, the metals are: Li, Ca, Mg, Mn, V, Sc, Y, Na, K.

From the list of conductors, Li alone has the energy level of 2.

Na and Mg both have energy level of 3 but Na has one valence electron while Mg has two.

Non-conductors or poor conductors do not allow either heat or electricity to pass through them easily. They are usually the non-metals and semimetals or metalloids.

From the list of elements, the poor conductors are: Br, I, S, As, Sb

Only the element S, has an energy level of 3. Both Br and As have energy levels of 4 each. However, Br has seven valence electrons while As has five valence electrons.

The elements identified can be used to fill the dichotomous key attached below.

Answer:

\(n_{CO(NH_2)_2}=73.3molCO(NH_2)_2\)

Explanation:

Hello.

In this case, given the two balanced chemical reactions:

\(CO(NH_2)_2 (l) \rightarrow HNCO(l) + NH_3(g)\\\\ 6HNCO(l) \rightarrow C_3N_3(NH_2)_3 (l) + 3CO_2(g)\)

We first compute the moles of HNCO from the obtained 1.00 kg of melamine (molar mass 126 g/mol) by considering the 65 % yield:

\(m_{C_3N_3(NH_2)_3}^{theoretical}=\frac{1.00kg}{0.65}=1.54kg\)

\(n_{HNCO}=1.54kgC_3N_3(NH_2)_3*\frac{1000g}{1kg}*\frac{1molC_3N_3(NH_2)_3}{126gC_3N_3(NH_2)_3} *\frac{6molHNCO}{1molC_3N_3(NH_2)_3} \\\\n_{HNCO}=73.3molHNCO\)

Next, we compute the moles of urea in the first chemical reaction:

\(n_{CO(NH_2)_2}=73.3molHNCO*\frac{1molCO(NH_2)_2}{1molHNCO} \\\\n_{CO(NH_2)_2}=73.3molCO(NH_2)_2\)

Best regards.

Answer:

80.2L

Explanation:

Given parameters:

Initial volume of oxygen = 47.2L

Initial pressure of oxygen = 1240torr

Final pressure  = 730torr

Unknown:

Final volume  = ?

Solution:

To solve this problem, we apply the Boyle's law proposed by Robert Boyle. It states that "the volume of a fixed mass of a gas varies inversely as the pressure changes if the temperature is constant".

Mathematically;

             P₁V₁ = P₂V₂

P and V are pressure and volume

1 and 2 are initial and final states

              1240 x 47.2  = 730 x V₂  

                  V₂  = 80.2L

\(\huge\mathfrak\red {Answer:}\)

It represents

(1 kilogram = 1000 grams)

\(\mathfrak\purple {Hope\: this\: helps\: you...}\)

One molecule of sucrose is burned with oxygen to make carbon dioxide and water.

Disaccharide sugar sucrose is composed of glucose and fructose. It is produced naturally by plants and is the main component of white sugar. C₁₂H₂₂O₁₁ is the chemical formula for it.

Extraction and refining sucrose for human use can be done from either sugarcane or sugar beet. Raw sugar is created from crushing the cane, which is consistently delivered to other sectors to be refined into pure sucrose. Sugar mills generally are located in the tropical regions near the sugarcane plantations.

                   C₁₂H₂₂O₁₁ + 12O₂  →  12CO₂ + 11H₂O

When one molecule of sucrose is burnt, we get 12 carbon dioxide molecules.

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There are approximately 1.62 x 10^25 water molecules in the 499.8 mL bottle of water.

To determine the number of water molecules in the given volume of water, we need to use the relationship between mass, volume, and molar mass of water.

First, we need to find the mass of water in the bottle:

Mass = Density * Volume

Mass = 0.967 g/mL * 499.8 mL = 483.9 g

Next, we need to convert the mass of water to moles using the molar mass of water. The molar mass of water (H2O) is approximately 18.015 g/mol.

Moles = Mass / Molar mass

Moles = 483.9 g / 18.015 g/mol = 26.88 mol

Finally, we can calculate the number of water molecules using Avogadro's number, which is approximately 6.022 x 10^23 molecules/mol.

Number of molecules = Moles * Avogadro's number

Number of molecules = 26.88 mol * (6.022 x 10^23 molecules/mol) = 1.62 x 10^25 molecules

Therefore, there are approximately 1.62 x 10^25 water molecules in the 499.8 mL bottle of water.

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Answer:

Gallium

Explanation:

Answer:

Gallium

Explanation:

This is a acid catalyzed reaction proceeds through carbocation as an intermediate forms in the first step by consumption of acid.

While aspirin is ingested, it's far broken right down to salicylic acid by way of the primary conditions within the small gut. it's miles then absorbed into the bloodstream. Aspirin can be made with the aid of reacting salicylic acid with acetic acid within the presence of an acid catalyst.

Aspirin is quite simply hydrolyzed to salicylic acid, each enzymatically and non-enzymatically. Salicylic acid undergoes conjugation reactions producing the essential metabolites salicyluric acid (apparently catalyzed by using an acyl-CoA N-acyltransferase) and glucuronides (gluc) (catalyzed through UGTs).

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dolphin and whales use echolocation

Answer:

B

Explanation:

it is the correct composition of water

Answer:

the types of this reaction is single replecmnt

The amount of heat energy produced when 1 g of hydrogen and 2 g of nitrogen are reacted, is -6.61 KJ

First, we shall obtain the limiting reactant. Details below:

3H₂ + N₂ -> 2NH₃

From the balanced equation above,

28 g of N₂ reacted with 6 g of H₂

Therefore,

2 g of N₂ will react with = (2 × 6) / 28 = 0.43 g of H₂

We can see that only 0.43 g of H₂ is needed in the reaction.

Thus, the limiting reactant is N₂

Finally, we the amount of heat energy produced. Details below:

3H₂ + N₂ -> 2NH₃ ΔH = -92.6 KJ

From the balanced equation above,

When 28 grams of N₂ reacted, -92.6 KJ of heat energy were produced.

Therefore,

When 2 grams of N₂ will react to produce = (2 × -92.6) / 28 = -6.61 KJ

Thus the heat energy produced from the reaction is -6.61 KJ

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Answer:

Democritus's model stated that matter consists of invisible particles called atoms and a void (empty space). He stated that atoms are indestructible and unchangeable. ... His atomic model was solid, and stated all atoms differ in size, shape, mass, position and arrangement, with a void exists between them.

Explanation:

complexes can be classified based on number of unpaired electron as follows square planar strong field: 2 unpaired electrons, octahedral weak field: 4 unpaired electrons, tetrahedral strong field: 2 unpaired electrons, octahedral strong field: 0 unpaired electrons, tetrahedral weak field: 4 unpaired electrons, square planar weak field: 4 unpaired electrons.

In a coordination complex, the number of unpaired electrons in the metal ion depends on the strength of the ligand field and the orientation of the ligands. Strong field ligands have a higher affinity for the d orbitals and can more effectively stabilize them, leading to a lower number of unpaired electrons in the metal ion.

Weak field ligands have a lower affinity for the d orbitals and do not stabilize them as effectively, leading to a higher number of unpaired electrons in the metal ion. The number of unpaired electrons also depends on the orientation of the ligands, with an octahedron (6 ligands) and a tetrahedron (4 ligands) leading to different numbers of unpaired electrons.

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The mass of the cereal that you would need to consume can be obtained as 84.8 g

The number of moles, denoted by the symbol "n," is a fundamental unit of measurement in chemistry that represents the amount of a substance. It is used to quantify the quantity of atoms, molecules, or ions in a sample.

Number of moles of sucrose in the cereal = 11g/342 g/mol

= 0.03 moles

Now;

0.03 moles of sucrose is contained in 60 g of cereal

0.0424 moles of sucrose would contain 0.0424 moles * 60 g/0.03 moles

= 84.8 g

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34.57 grams of Li3PO4 are required to react 44 g of H2SO4, in this case.

H2SO4 mass divided by its molar mass yields the number of moles of H2SO4: 44 g divided by 98.07 g/mol, or 0.4484 mol.

Li3PO4 moles equal (2/3) x H2SO4 moles equal (2/3) x 0.4484 mol = 0.2989 mol.

Using its molar mass, we can finally get the mass of Li3PO4 needed in grams:

Li3PO4 necessary mass equals number of moles times the molar mass of Li3PO4 (0.2989 mol times 115.78 g/mol equals 34.57 g).

As a result, 44 g of H2SO4 must be utilized in the reaction along with 34.57 g of Li3PO4.

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Answer:

It's due to the forces that are known as balanced forces and it might also be because there is no friction

Answer:

The forces between you and the rock are balanced.

Explanation:

The force of your push against the rock and the opposing force of the rock pushing back on you are equal and opposite, meaning they balance each other out. This results in the rock not moving, because the net force on the rock is zero. This situation is referred to as static friction, which acts to prevent an object from moving when there is a force being applied to it. The force of static friction is always equal in magnitude but opposite in direction to the force being applied, until the force becomes large enough to overcome the static friction and cause the object to start moving.

A major purchase refers to a high-cost item or service that is considered a significant investment for an individual or household, such as a car, home, or college education. Major purchases usually involve a large sum of money and require careful planning and consideration before a final decision is made.

Any item that a person or a household buys for their own use or consumption is called a consumer good. Durable and non-durable goods are two types of consumer goods that can be classified. Consumer goods are tangible items that people or households buy for their own use or consumption.

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Your question is incomplete, most probably the complete question is:

The difference between Major purchase and Consumer good​?

The temperature increase from 20 °C to 46 °C indicates that the reaction between zinc and copper sulfate solution is exothermic, with heat being released into the surroundings.

In the given reaction between zinc and copper sulfate solution, the temperature change can provide insights into the type of heat change occurring during the reaction. Based on the provided information, the initial temperature of the copper sulfate solution was 20 °C, and the final temperature of the mixture after the reaction was 46 °C.

The temperature increase observed in this reaction indicates an exothermic heat change. An exothermic reaction releases heat energy into the surroundings, resulting in a temperature rise. In this case, the reaction between zinc and copper sulfate solution is exothermic because the final temperature is higher than the initial temperature.

During the reaction, zinc displaces copper from copper sulfate to form zinc sulfate and copper metal. This displacement reaction is known as a single displacement or redox reaction. Zinc is more reactive than copper and therefore replaces copper in the compound.

The formation of new chemical bonds during the reaction releases energy in the form of heat. This energy is transferred to the surroundings, leading to an increase in temperature. The heat released is greater than the heat absorbed, resulting in a net increase in temperature.

The exothermic nature of this reaction can be explained by the difference in bond energies between the reactants and products. The breaking of bonds in the reactants requires energy input, while the formation of new bonds in the products releases energy.

In this case, the energy released during the formation of zinc sulfate and copper metal is greater than the energy required to break the bonds in copper sulfate and zinc.

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Answer:

Electromagnetism can cause cancer

So option A is incorrect

Electromagnetism can damage a medical instruments

It is also a disadvantage and this option is not correct

Now come to C it says that electromagnetic is used to veiw the soft tissue it is not a disadvantage but a advantage so C IS THE CORRECT ANSWER

Explanation:

PLEASE MARK ME BRAINLIEST IF MY ANSWER IS CORRECT PLEASE

Exothermic refers to chemical interactions that aerobic respiration. Combustion reactions release higher energy. Endothermic refers to atoms and molecules that either use or absorb reactive power.

A chemical process known as an endothermic releases energy as heat or light. It is an endothermic reaction's opposite. Chemical equation expressed as reactants + products + energy. An reaction mechanism is one in which electricity is given off as light or warmth.

A response is deemed to be exothermic if it produces heat while also undergoing a net decrease in basic enthalpy change. Samples include those type of combustion, iron rust, including water froze. Exothermic processes are those that discharge heat and energy into the surroundings.

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