Which of these elements would have the largest atomic radius?

Answer: D

Explanation:

The number of moles of  Fe₂O₃ that must react to produce 760 kg of Fe are 20.503

The mole is a SI unit of measurement that is used to calculate the quantity of any substance.

The reaction is \(\rm Fe_2O_3 (s) + 3CO (g) ----- > 2Fe (l) + 3CO_2\)

The mass of Fe is given 760 kg

The molar mass of Fe is 55.9 g/mol

To calculate the number of moles

\(n = \dfrac{m}{M} \\\\n = \dfrac{760000}{55.9 g/mol} = 13,669\)

Now, the ratio between Fe and O is 2 : 3

\(\dfrac{13,669}{2} \times 3 = 20,503.5\)

convert it into kg = 20.503 mol

Thus, the moles are 20.503 mol

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Answer:

The molar mass of \(NI_{3}\) is 394.719 g/mol.

Explanation:

This was on my periodic table.

To answer your question, the useful buffering range of phosphoric acid and its conjugate base is approximately between pH 6.21 to 8.21.

This is because the pKa of phosphoric acid is 7.21, which means that at pH values below 6.21, most of the acid will be in its protonated form (H3PO4) and at pH values above 8.21, most of it will be in its deprotonated form (H2PO4-). However, within this buffering range, there will be a relatively equal distribution of both the protonated and deprotonated forms,

which allows for the acid-base pair to act as an effective buffer. The buffer capacity is the highest at pH = pKa and decreases as the pH moves away from pKa. The conjugate base of phosphoric acid is H2PO4-, and it acts as the base in the buffer system. In summary, the useful buffering range of phosphoric acid and its conjugate base is between pH 6.21 to 8.21, which allows for the acid-base pair to act as an effective buffer.

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Step 1

The reaction:

CaCO3 + heat => CaO + CO2 (completed and balanced)

-----------------------

Step 2

Information provided:

Actual yield = 0.53

Answer:

the red line

Explanation:

Answer:

The answer is alpha, beta, and gamma

Explanation:

I took this quiz, and that answer was correct.

(Good luck on primavera my G)

The cleavage yields a carbonyl cation or "acylium" ion, which has a high abundance because it is resonance stabilized.

The ion that is formed as a result of alpha-fragmentation in a ketone or aldehyde mass spectrum is called the acylium ion. This ion is stabilized by resonance, which is why it is typically observed as the base peak in the mass spectrum. The acylium ion is a cationic species that contains a positive charge on the carbonyl carbon and a lone pair of electrons on the oxygen atom. This charge distribution allows for resonance stabilization, as the positive charge can be delocalized across the carbonyl carbon and the adjacent carbon atom. The acylium ion is also a reactive intermediate that can undergo further fragmentation or reactions with other molecules. Overall, the observation of the acylium ion as the base peak in a ketone or aldehyde mass spectrum provides valuable information about the structure and stability of these compounds.

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Answer: 40cm^3

Explanation:

Since the The air today is approximately one-fifth oxygen, the approximate volume of oxygen in 200cm3 of air would be:

= 1/5 × 200

= 40cm

The answer is 40cm^3

The balanced equation :

LiI(aq) + AgNO₃(aq) --> AgI(s) + LiNO₃(aq)

Given

Word equation

Required

Balanced equation

Solution

There are 3 ways to express a chemical equation:

Skeleton equation for reaction above :

LiI(aq) + AgNO₃(aq) ⇒ AgI(s) + LiNO₃(aq)

If we look at this reaction, all the cations and anions have a charge of 1 (+1 or -1) so the balanced reaction between the skeleton equation and the balanced equation is the same

Answer:

Helium is a noble gas, so it's nonreactive. In contrast, hydrogen is very reactive. It would be dangerous to have explosive balloons.

Answer:

25 g

Explanation:

Mass percent implies the mass of solute dissolved in a solution

Mass percent = mass of solute/mass of solute + mass of solvent × 100/1

Since mass percent concentration= 20%

Mass of solvent = 100g

Let mass of solute = x

Hence;

20 = x/x +100 ×100/1

20/100= x/x + 100

0.2 = x/x + 100

0.2(x + 100) = x

0.2x + 20 = x

20 = x - 0.2x

20 = 0.8x

x= 20/0.8

x= 25 g

Answer:

Explanation:

not sure what 10# is

but you solve this way

(2.5 X 10 #) divide by (6.02 X 10^23)  X 28 g

6.02 x 10^23  is avogadros number use cause its in molecules

28 is the molar mass from the periodic table for CO

if I calculate it with 2.5 X 10 this is the answer  1.16 X 10^-21 g CO

Answer:

Metallic character decreases as you move across a period in the periodic table from left to right. This occurs as atoms more readily accept electrons to fill a valence shell than lose them to remove the unfilled shell. Metallic character increases as you move down an element group in the periodic table. This is because electrons become easier to lose as the atomic radius increases, where there is less attraction between the nucleus and the valence electrons because of the increased distance between them.

1. In order to answer this one and the next one, we will use mass percentage as our guide, since every compound has a mass percentage for each element, and this is found by checking the total mass and the separate masses of each element, for example, MgF2, the mass percentage is 39% for Mg and 61% for F2, this is due to their molar mass, 24g for Mg and 38g for F2

We have 27.1 g of Mg, and this will always correspond for 39% of the total mass of the compound, so we can do the following math:

100% = x

39% = 27.1g

x = 69.5 grams is the total mass of MgF2, now we only have to subtract the value of Mg and then we will have F2

69.5 - 27.1 = 42.4 grams, this is the mass of Fluorine

2. The same step by step from the previous question, 36% of the total mass is Al and 64% is S, but this question has a little difference, now we have the mass of the compound, but the process is very similar

100% = 50.2 grams

64% = x grams

x = 32.1 grams, which can be considered as letter A

Answer:

4 moles of HCl will be required to produce 2 moles of H2.

Explanation:

A balanced chemical equation gives the stoichiometric ration of moles of reactants required to produce a certain number of moles of products. The ratio of moles of reactants to moles of products is known as the mole ratio and is constant for a given chemical reaction.

In the given balanced equation of reaction shown below:

Zn + 2HCl → ZnCl2 + H2

The mole ratio of HCl and H2 is 2:1. This means that in this reaction between Zinc metal and hydrochoric acid to produc zinc chloride and hydrogen gas, every two moles of hydrochloric acid used in the reaction will result in the production of one mole of hydrogen gas.

Therefore for two moles of H2 to be obtained from the reaction, twice the number of moles of HCl is required.

Moles of HCl required = 2 × 2 moles = 4 moles of HCl.

Answer:

Anything that has less density than water will float on water.

Explanation:

Come on! It's basic knowledge!

10 g of sugar to 40g of water the solution becomes 50 g.

_________________________________________

= 10 / 50 * 100

= 20 %

_____________

Percentage of the sugar solute = Mass of solute / Mass of solution * 100

a. The radioactive nuclide is 47¹⁰²Ag

b. The radioactive nuclide is 10²⁴Ne

c. The radioactive nuclide is 90²²³

a. 47¹⁰²Ag or 47¹⁰⁹Ag
The radioactive nuclide is 47¹⁰²Ag. It is unstable because it has a higher neutron-to-proton ratio than the stable nuclide 47¹⁰⁹Ag. Radioactive isotopes typically have imbalanced neutron-to-proton ratios.

b. 12²⁵Mg or 10²⁴Ne
The radioactive nuclide is 10²⁴Ne. This isotope of neon is unstable due to the presence of too few neutrons compared to protons. Stable magnesium, 12²⁵Mg, has a balanced neutron-to-proton ratio.

c. 81²⁰³Tl or 90²²³Th
The radioactive nuclide is 90²²³Th. This isotope of thorium is known to be unstable and undergoes radioactive decay, while 81²⁰³Tl is considered a stable isotope of thallium.

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The product of the chemical reaction between NiSO₄ and K₂CO₃ is NiCO₃. Precipitates are solids that develop in solutions as a result of chemical reactions.

The given chemical reaction involves the combination of nickel sulfate (NiSO₄) and potassium carbonate (K₂CO₃). The reaction can be represented as follows:

NiSO₄ + K₂CO₃ → NiCO₃ + K₂SO₄

In this reaction, the cations (positively charged ions) and anions (negatively charged ions) swap to form new compounds. Nickel sulfate (NiSO₄) contains the Ni²⁺ cation and the SO4 ²⁻ anion, while potassium carbonate (K₂CO₃) contains the K⁺ cation and the CO3 ²⁻ anion.

Upon reaction, the Ni²⁺ cation from NiSO₄ combines with the CO₃ ²⁻ anion from K₂₂CO₃ to form nickel carbonate (NiCO₃). The other product formed is potassium sulfate (K₂SO₄), which is formed when the K+ cation from K₂CO₃ combines with the SO₄ ²⁻ anion from NiSO₄.

Precipitate formation is frequently a sign that a chemical reaction has taken place.

Therefore, the product of the chemical reaction between NiSO₄ and K₂CO₃ is NiCO₃.

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Answer:

The core of the earth is made of iron-nickel alloys.

Answer:

i know im painfully late but the answer is "the saturation point of a solution is measured in moles."

Explanation:

The relationship between concentration and mole is the number of particles of solute in a solution measured in terms of moles. Therefore,  option (D) is correct.

The mole is used to calculate the quantity amount of any substance. Moles of any substance can be determined by dividing the mass of the substance by its molar mass. Mole is useful to determine how many solute particles are present in a given solution.

Moles and molar mass are related to each other, as the concentration of substances can be calculated by using the number of moles of the solute.

The concentration of a solution is a measurement of the amount of solute per unit volume of solution. In chemistry, concentration is most commonly expressed in terms of molarity, which is equal to moles per liter solution.

Therefore, the correct option is option D.

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Answer:

At -20°C the mercury state will be liquid

Explanation:

The melting point of a substance is the temperature at which it changes from solid state to a liquid state, and the boiling point is the temperature at which it changes from liquid state to a gaseous state.

If mercury melts at -39°C and boils at 356.9°C, it means that if the temperature is lower than -39°C, mercury will remain al solid state. Between -39°C and 356.9°C, the state of mercury will be liquid and, above 356.9°C mercury will remain at gaseous state.

So, at -20°C the mercury state will be liquid, because that temperature it is between -39°C and 356.9°C.

Move the decimal so there is a non-zero digit to the left of the decimal point. The number of decimals you move will be the exhibitor on the 1010. If the decimal has been moved to the right, the exponent will be negative. If the decimal has been moved to the left, the exponent will be positive.

\(1.8 \times 10 { }^{1} \)