True or false: physical changes occur when enough energy is released or absorbed from a substance

Answers

Answer 1

Answer: I believe it's true. Physical changes occur when enough energy is released or absorbed from a substance.

Related Questions

Which statement describes how an atom in the ground state becomes excited?(1) The atom absorbs energy, and one or more electrons move to a higher electron shell.(2) The atom absorbs energy, and one or more electrons move to a lower electron shell.(3) The atom releases energy, and one or more electrons move to a higher electron shell.(4) The atom releases energy, and one or more electrons move to a lower electron shell.
Covalent bonding is when atomstransfer electrons drop electrons share electrons create electrons
From what class(es) of elements is the following compound made? nitrogen dioxide metal and metalloid two metals metal and nonmetal two nonmetals
8.00*10^-5 mol was diluted to 500ml what is the concentration in Mol/L?
2.The image below shows two nitrogen atoms. For these two atoms to form a stable molecule, N2, how many electrons would have to be part of covalent bonds?

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

Answers

Answer;

From highest to lowest is Li>Na>K>Rb.

Explanation;

- Ionization energy is the energy that is required to dislodge or remove an electron from the outer most energy level or energy shell. The first ionization energy is the energy required to remove the first electrons from the outermost energy shell.

- Lithium will have the highest first ionization energy, as the outer electron is closer to the pull of the nucleus and not shielded by full shells. This means that rubidium will be the lowest.

Answer;

From highest to lowest is Li>Na>K>Rb.

Explanation;

- Lithium will have the highest first ionization energy, as the outer electron is closer to the pull of the nucleus and not shielded by full shells. This means that rubidium will be the lowest.

The first ionization energy is the energy that the atom lost its first electrons. The energy decrease and the atom is more reactive. So from highest to lowest is Li>Na>K>Rb.

While a certain isotope decays, it emits photons. what kind of decay is happening? alpha decay beta decay gamma decay positron decay

Answers

While a certain isotope decays, it emits photons.It is a type of gamma decay.

What are isotopes?

Isotopes are defined as substances having same number of protons but different number of neutrons.Number of protons is characteristic for determining position of elements in the periodic table.

Since,all isotopes have the same number of protons and hence have same position.They have similar chemical properties as they have same number of electrons.

They find applications in the field of nuclear medicine and oil and gas research . There are 2 types of isotopes : stable and unstable

Unstable isotopes are radioactive and are called as radioisotopes.Some of these isotopes are man -made and hence also called as artificial isotopes.Every element has an isotope which is either man-made or natural .

Many properties of isotopes depend on mass which is measured in atomic mass unit. The difference in actual mass and mass number is called mass defect.

Learn more about isotopes,here:

brainly.com/question/11680817

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Answer:

gamma decay.

Explanation:

A gamma decay emits only a gamma-ray photon,

When determining whether a chemical reaction has taken place you observe and look for several indicators. Which would be considered an indication that a chemical reaction or chemical change has taken place? es -) A) Solid melts. B) Heat is given off. Substance dissolves D) Substance changes shape. Physical Science

Answers

Answer:

B) Heat is given off.

Explanation:

When heat is given off, a chemical change must have occurred and such a reaction is termed an exothermic reaction.

A chemical change is one in which;

the process is not easily reversible
leads to the production of new kinds of matter
involves change in mass
requires a considerable amount of energy.

Most chemical reactions are accompanied by heat changes.

What is the net ionic equation for the reaction of solid iron with aqueous copper sulfate? (Hint: First use the activity series to write the formula unit equation!)

Answers

For the answer to the question above,
The reaction of solid iron with aqueous copper sulfate is an example of a single displacement type of reaction which exchanges only the cations of the element and the compound. In this case, the equation is

Fe (s) + CuSO4 (aq) = FeSO4 + Cu (s)

Answer:

The net ionic equation for the reaction of solid iron with aqueous copper sulfate:

$Fe(s)+Cu^(2+)(aq)\rightarrow Fe^(2+)+(aq)+Cu(s)$

Explanation:

Solid iron = Fe

Copper sulfate = $CuSO_4$

$Fe(s)+CuSO_4(aq)\rightarrow FeSO_4(aq)+Cu(s)$

In an aqueous solution of copper sulfate we have copper (II) ions and sulfate ions.

$CuSO_4(aq)\rightarrow Cu^(2+)(aq)+SO_4^(2-)(aq)$

In an aqueous solution of ferrous sulfate we have ion (II) ions and sulfate ions.

$FeSO_4(aq)\rightarrow Fe^(2+)+(aq)+SO_4^(2-)(aq)$

$Fe(s)+Cu^(2+)(aq)+SO_4^(2-)(aq)\rightarrow Fe^(2+)+(aq)+SO_4^(2-)(aq)+Fe^(2+)+(aq)$

Cancelling out the common ions from both sides, we get the net ionic equation:

$Fe(s)+Cu^(2+)(aq)\rightarrow Fe^(2+)+(aq)+Cu(s)$

6 CO2 + 6 H2O + Energy--> C6H12O6 + 6 O2 is the chemical formula for:A: abiogenesis
B: Respiration
C: Photosynthesis
D: Homostasis

Answers

This would be the formula representing the process of C. Photosynthesis.

Answer:

C. photosynthesis

Explanation:

An electric current is conducted by what?

Answers

An electric current is conduced by the solution of NaCI

I hope that's help !

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