4 Which quantity represents the number of protons in an atom?(1) atomic number
(2) oxidization number
(3) number of neutrons
(4) number of valence electrons

Answers

Answer 1

Answer: Atomic number. That's basically the definition of atomic number.

Answer 2

Answer: The quantity that represents the number of proteins in an atom is the atomic number.

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What is the approximate pH at the equivalence point of a weak acid-strong base titration if 25 mL of aqueous formic acid requires 29.80 mL of 0.3567 MNaOH? Ka = 1.8×10−4 for formic acid.

When 25.0 mL of sulfuric acid solution was completely neutralized in a titration with 0.05 M NaOH solution, it took 18.3 mL of the NaOH(aq) to complete the job. The reaction is:NaOH(aq) + H2SO4(aq) → Na2SO4(aq) + H2O(l)
What was the molarity of the sulfuric acid solution?

Answers

Balanced equation will be as follows

2NaOH + H2SO4=Na2SO4 + 2H2O
from MaVa/MbVb=Na/Nb where Ma is molarity of acid=?
Va is volume of acid=25.0 mL
Mb is molarity of base= 0.05 M
Vb is volume of base=18.3 mL
Nb number of moles of base= 2
Na is number of moles of acid =1

Ma*25 mL / 18.3mL*0.05M = 1/2
Ma=18.3*0.05M / 50 = 0.0183M

The molarity of sulphuric acid = 0.0183M

Final answer:

The molarity of the sulfuric acid solution is found using the formula: M1V1/2 = M2V2 to account for the 2:1 ratio of NaOH to H2SO4 in the reaction. Substituting the given values yields the molarity of sulfuric acid solution as 0.0732M.

Explanation:

This problem involves a concept known as titration, specifically acid-base titration. In this process, one solution (in this case, the base NaOH) is added to another solution (the acid H2SO4) until the mixture is neutralized. The balanced chemical equation NaOH + H2SO4 -> Na2SO4 + 2H2O tells us that the reaction occurs in a 2:1 ratio of NaOH to H2SO4.

To find the molarity of the sulfuric acid, we use the formula: M1V1 = M2V2, where M1 is the molarity of the NaOH, V1 is the volume of the NaOH, M2 is the molarity of the H2SO4 (which we want to find), and V2 is the volume of the H2SO4. However, we need to adjust the equation to M1V1/2 = M2V2 because the reaction occurs in a 2:1 ratio of NaOH to H2SO4.

So substituting the given values into the equation, we have (0.05 M * 18.3 mL) / 2 = M2 * 25.0 mL. Solving for M2, the molarity of the sulfuric acid solution, yields M2 = 0.0732M.

Learn more about Acid-Base Titration here:

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Please help!!! Thank youuu I’ll give brainlist to first to get them right

Answers

questions 3 gravity

question 1 meteorites

question 2 orbit

question 4 rocket and gaseous

Answer:

1. moons 2. orbits 3. gravity 4. rocky, gaseous

Explanation:

The bonds in BaO are best described as(1) covalent, because valence electrons are shared
(2) covalent, because valence electrons are transferred
(3) ionic, because valence electrons are shared
(4) ionic, because valence electrons are transferred

Answers

The answer is (4) ionic, because valence electrons are transferred. Ba is a metal and O is a nonmetal, so the bond between them is ionic. Ionic bonds occur when electrons are transferred from the metal to the nonmetal, and the cation-anion pair is held together by electrostatic attraction.

_____ is the time required for one-half of the atoms of a radioisotope to decay to products. a. fusion
b. radioactivity
c. half-life
d. fission

Answers

C half life..............................

The tempertaure at which the pressure of the vapor of a liquid is equal to the external pressure acting on the surface of the liquid?

Answers

Answer: Boiling point

Explanation:

Boiling point is the temperature where the vapor pressure of a liquid equals the pressure of the gas present above it.

The normal boiling point of a liquid is the temperature at which its vapor pressure is equal to one atmosphere.

Boiling point depends on the intermolecular forces present between the molecules. More are the intermolecular forces, lesser will be the vapor pressure and thus more heat will be supplied to make vapor pressure equal to the atmospheric pressure. Thus higher will be the boiling point.

Normal boiling point for water is $100^0C$ .