CHEMISTRY HIGH SCHOOL

What is required for reactants to form bonds?energy output
energy input
equilibrium
exchange reaction

Answers

Answer 1
Answer: Energy input is required for reactants to form bonds.

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Which of the following observations led physicist James Chadwick to perform experiments that eventually led to the discovery of the neutron?A. Protons alone were not able to account for the density of an atoms nucleus.

B. Atomic nuclei possess shells similar to the electron shells of atoms.

C. Some atoms contained more protons than electrons.

Answers

The correct answer is letter C. James Chadwick confirmed the existence of neutrons.In his experiment, he was able to show that the particles that were ejected had no electrical charge but had almost the same mass as the proton. These particles were, of course, neutrons.

As an atom becomes an ion, its mass number(1) decreases(2) increases(3) remains the same

Answers

As an atom becomes an ion, its mass number \boxed{\left( 3 \right){\text{ remains the same}}}  

Further explanation:

The smallest unit of an element is called an atom. It is also known as the building block of matter. An atom is generally represented as _{\text{Z}}^{\text{A}}{\text{X}}, where X is the symbol of the element, A is its atomic mass or mass number and Z is its atomic number.

The number of protons present in the atomic nucleus is termed as the atomic number (Z) whereas the total number of nucleons present in the nucleus of an atom is called mass number or atomic mass (A).

When electrons are either gained or lost from the neutral atom, it results in the formation of ions. Cations are the positively charged ions that are formed due to the removal of electrons from the neutral atom. Anions are the negatively charged ions that result from the addition of electrons to the neutral atom.

Since the formation of either type of ion requires gain or loss of electrons but mass number is the total number of protons and neutrons present in the atomic nucleus, the mass number remains the same when ions are formed from their respective ions. Therefore option (3) is the correct answer.

Consider an example of a sodium atom whose atomic number is 11 so it has an electronic configuration of 1{s^2}2{s^2}2{p^6}3{s^1}. It loses one electron to form its monovalent ion, {\text{N}}{{\text{a}}^ + } which has the configuration of 1{s^2}2{s^2}2{p^6}. The number of electrons in Na is 11 while that in {\text{N}}{{\text{a}}^ + } is 10. But both the species have same number of protons and neutrons in them. So the mass number remains unchanged if an atom forms its ions.

Learn more:

1. Component of John Dalton’s atomic theory: brainly.com/question/2357175

2. Basis of investigation for the scientists: brainly.com/question/158048

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Atomic structure

Keywords: atom, matter, atomic nucleus, proton, electron, neutron, cations, anions, Na, 11, Na+, electronic configuration.
Becoming an ion involves gaining or losing electrons
Electrons have a relative mass of 0
So adding or removing them doesn't change the mass of the atom
So the answer is (3) remains the same

Which quantities must be conserved in all chemical reactions? 1) mass, charge, density
2)mass, charge, energy
3) charge, volume, density
4) charge, volume, energy

Answers

   2) mass, charge, energy


in a balanced reaction, all of the following are conserved

Answer: It's B this will help u

how many moles of ammonium sulfate can be made from the reaction of 30.0 mol nh3 with h2so4 according to the following equation.

Answers

15.0 moles of ammonium sulfate are formed by the reaction of 30.0 moles of ammonia with sulfuric acid.

Let's consider the reaction between ammonia and sulfuric acid to produce ammonium sulfate.

2 NH₃ + H₂SO₄ ⇒ (NH₄)₂SO₄

The molar ratio of NH₃ to (NH₄)₂SO₄ is 2:1. The moles of (NH₄)₂SO₄ produced from 30.0 moles of NH₃ are:

30.0 mol NH_3 * (1mol(NH_4)_2SO_4)/(2molNH_3) = 15.0 mol(NH_4)_2SO_4

15.0 moles of ammonium sulfate are formed by the reaction of 30.0 moles of ammonia with sulfuric acid.

Learn more: brainly.com/question/9743981
The answer is 15.0 mol ammonium sulfate. This is a stoichiometric problem. For the calculations, please refer to the attachment.

If the pressure P applied to a gas is increased while the gas is held at a constant temperature, then the volume V of the gas will decrease. The rate of change of the volume of gas with respect to the pressure is proportional to the reciprocal of the square of the pressure. Which of the following is a differential equation that could describe this relationship?

Answers

The differential relationship has been \rm \bold{(dV)/(dP)\;=\;(C)/(P^2)}.

The gas has been termed to be the ideal gas. For an ideal gas at a constant temperature, the relationship of the change in pressure and volume can be given as constant. The relationship has been given with the application of Boyle's law.

The product of the pressure and volume has been a constant quantity for a reaction.

Pressure * Volume = Constant

PV = C

V = \rm (C)/(P)

Differentiating the equation:

\rm (dV)/(dt)\;=\;(C)/(P^2)\;(dP)/(dt)

\rm (dV)/(dt)\;*\;(dt)/(dP)\;=\;(C)/(P^2)

\rm (dV)/(dP)\;=\;(C)/(P^2)

The differential relationship has been \rm \bold{(dV)/(dP)\;=\;(C)/(P^2)}.

For more information about pressure at a constant temperature, refer to the link:

brainly.com/question/12152879?

Answer:

A differential equation that could describe the relationship of the rate of change of the volume of gas with respect to the pressure is;

V' = -(C)/(P^2).

Explanation:

Boyle's law states that at constant temperature, the pressure of a given mass of gas is inversely proportional to its volume.

That is;

P₁×V₁ = P₂×V₂ or

P×V = Constant, C

That is V = (C)/(P)

Therefore, the rate of change of volume of a gas is given as

(dV)/(dt) = -(C)/(P^2) (dP)/(dt) which gives

(dV)/(dt) * (dt)/(dP)= (dV)/(dP) = -(C)/(P^2)

That is the rate of change of the volume of gas with respect to the pressure is proportional to the reciprocal of the square of the pressure.

(dV)/(dP) = -(C)/(P^2).

V' = -(C)/(P^2).

If a runner completes a 10 kilometer race in 32.50 minutes, what is the 10.0 km pace in miles per hour? (1.609 km = 1 mile approximately)

Answers

If a runner completes a 10 km race in 32.5 minutes, his pace or speed can be calculated by the equation:

velocity = distance/time = 10km/32.5 mins = 0.3125 km/min

Convert this value to miles per hour using the conversion factors for minutes to hours and kilometers to miles as requested by the problem. This gives an answer of 11.47 miles per hour.

0.3125 km/min x 60 mins./ 1 hour x 1 mile / 1.609 km = 11.47 miles/hour
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