Why is calcium harder than potassium?

Answers

Answer 1

Answer: Because calcium atoms have smaller radii than potassium atoms since calcium atoms have a greater nuclear charge. Each calcium atom will be closer to the delocalized electrons. Thus, the bonds in calcium will be stronger than that in potassium.

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Which scientist developed the equation of wave mechanics?

Answers

The scientist that developed the equation of wave mechanics is Erwin Schrodinger that combined the works of Bohr and de Broglie. The electron was a three dimensional wave circling the nucleus in a whole number of wavelengths allowing the waveform to repeat itself as a stable standing wave (it can absorb energy form a nearby source which is oscillating at a proper frequency) representing the energy levels of Bohr model. He also said that Broglie’s model was correct about the matter waves and the electrons are located in the atomic space according to standing wave frequencies.

when this equation is correctly balanced using smallest whole numbers, what is the coefficient of O2(g)

Answers

When the equation is correctly balanced , the coefficient of O₂ = 3.

What is Balancing of Equation ?

The amounts of reactants and products required to satisfy the Law of Conservation of Mass are given in a balanced chemical equation.

This indicates that on the reactant side of the equation, there are the same number atom as there are on the product side of the equation.

In the question the given equation is

C₂H₄+O₂→CO₂+H₂O

When the equation is correctly balanced using smallest whole numbers

C₂H₄+3O₂→2CO₂+2H₂O

To determine if the equation is balanced or not , if we will check the reactant molecules with the product molecules.

C = 2 in reactant and product

O=6 in reactant and product

H=4 in reactant and product

So the equation is balanced

and so the coefficient of O₂ = 3

To know more about the balancing of Equation

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The subscript is 2, while the coefficient, since it has non, it would be a one.

Answer: one

The Brønsted-Lowry theory defines an acid as a(n)a. hydrogen ion donor.
b. hydrogen ion acceptor.
c. electron-pair donor.
d. electron-pair acceptor.

Answers

Letra A. Doador de H+

How many atoms of each element are in citric acid C₃H₄OH(COOH)₃?

Answers

Simplify

C3H4OH(COOH)3
C3H4OHC3H3O6
C6H8O7

6carbon

8Hydrogen

7Oxygen

What is the percent composition by mass of nitrogen in NH4NO3 (gram-formula mass = 80.0 grams/mole)?(1) 17.5% (3) 52.5%
(2) 35.0% (4) 60.0%

Answers

Answer:

The correct option is (2) 35.0%

Explanation:

If we want to calculate the percent composition by mass of nitrogen in NH4NO3 we first need to calculate the mass of nitrogen in one mole of NH4NO3.

Because of the molecular form of NH4NO3 (it has 2 ''N'') we know that one mole of NH4NO3 contains 2 moles of N.

The molar mass of N (nitrogen) is $14.0067(g)/(mole)$

This means that 1 mole of N contains 14.0067 grams of N.

Because we have 2 moles of N ⇒ $(2moles).(14.0067(g)/(mole))=28.0134g$

We know that in 1 mole of NH4NO3 we have 2 moles of N(28.0134 g of N).

To calculate the percent composition by mass of nitrogen we need to divide the mass of nitrogen in one mole of NH4NO3 by the mass of one mole of NH4NO3 and then multiply it by 100.

We know that in 1 mole of NH4NO3 there are 80.0 g of NH4NO3 (Because of the molar mass data) ⇒

$((28.0134g)/(80.0g)).100=35.016$ % ≅ 35.0%

We find that the percent composition by mass of nitrogen in NH4NO3 is 35.0%

We conclude that the correct option is (2) 35.0%

gram-formula=80.0grams/mole will be 35.0%

Which one is stronger acid with ph=5 or ph=2

Answers

pH=2. The lower the pH level, the higher the acidity is. Meanwhile, the higher the pH, the more basic the substance is

Each change in pH is a change in Hydrogen Ion concentration by a factor of 10. So a pH 2 acid is 1000 times stronger than a pH 5 acid.

Other Questions

Which of the following is a balanced equation for cellular respiration? A.C6H12O6 + 6O2 6CO2 + 6H2O B.CO2 + H2O C6H12O6 + O2 C.6CO2 + 6H2O C6H12O6 + 6O2 D.6C6H12O6 + 6O2 6CO2 + H2O E.C6H12O6 + O2 CO2 + H2O F.6CO2 + 6H2O C6H12O6 + 6O2

Background Info:The standard enthalpy of formation (ΔH∘f) is the enthalpy change that occurs when exactly1 mol of a compound is formed from its constituent elements under standard conditions. The standard conditions are 1 atm pressure, a temperature of 25 ∘C , and all the species present at a concentration of 1 M . A "standard enthalpies of formation table" containing ΔH∘f values might look something like this:SubstanceΔH∘fH(g)218 kJ/molH2(g)0 kJ/molBa(s)0 kJ/molBa2+(aq)−538.4 kJ/molC(g)71 kJ/molC(s)0 kJ/molN(g)473 kJ/molO2(g)0 kJ/molO(g)249 kJ/molS2(g)129 kJ/molQuestion:What is the balanced chemical equation for the reaction used to calculate ΔH∘f of BaCO3(s)?If fractional coefficients are required, enter them as a fraction (i.e. 1/3). Indicate the physical states using the abbreviation (s), (l), or (g) for solid, liquid, or gas, respectively. Use (aq) for aqueous solution.EXPRESS ANSWER AS A CHEMICAL EQUATION. Please explain for me too!!!

A solution containing large amount of solute in comparison to solvent is... A ) aqueous,b. concentrated, c. Diluted, and d. soluble

Please help me fill this all out! (Will give brainliest and a heart) This has to do with the fight or flight response.