Chemistry High School

Changes in thermal energy provide evidence that a chemical reaction
has occurred. Which of the following BEST describes a chemical reaction
in which energy is released?
Select one:
Exothermic reaction.
Reversible reaction
Physical reaction
Endothermic reaction.

Answers

Answer 1

Answer:

Exothermic reaction

Explanation:

Exothermic reaction is a reaction in which energy is evolved from the reaction to the surroundings

Related Questions

I really need help I'm not good with science

Answers

Answer:

A!!!!!!!!

Explanation:

An example of a binary compound is
a.
potassium chloride
b.
ammonium chloride
potassium chlorate
ammonium chlorate

Answers

Answer:

a. KCl

Explanation:

a. KCl - made of 2 elements

b. NH4Cl

c. KClO3

d. NH4ClO3

A. I am pretty certain this is it it’s not sorry

What does 10% humidity in a weather report indicate?
A)the level of humidity is high.
B)the level of humidity is low.
C)the level of humidity is moderate.
D)the air can not hold anymore water.

Answers

Answer:

B

the humidity is the % of water in the air and it is out of 100% of the air. so 10/100 is low

Answer:

B

Explanation:

30%-50% is considered moderate. Anything below 30% is considered dry, anything above 50% is considered high. I hope this helps!

NaCl + NH3 + CO2 + H20 NaHCO3 + NH4CI
Which Lewis electron-dot diagram correctly represents the reactant containing nitrogen in the equation?

Answers

Since its asking for just the reactant, you can ignore the whole left side. Now since its only asking for the reactant containing Nitrogen, you can ignore the NaHCO3 since it doesnt have nitrogen.
That leaves us with drawing the structure of NH4Cl.
This was a tough one for me to find, as I kept drawing Ammonia instead and couldnt figure out how to fit in the extra Hydrogen and Chlorine. Luckily, this Y!A answer explains it, its due to a hydrogen bond

Option (1) represents the Lewis electron-dot diagram correctly containing nitrogen in the equation.

Lewis Structure is a very simplified representation of the valence shell electrons in a molecule.  It is used to show how the electrons are arranged around individual atoms in a molecule. Electrons are shown as "dots" or for bonding electrons as a line between the two atoms.

Valence electrons are given by hydrogen atoms = [tex]1\times3=3[/tex]

Valence electrons are given by nitrogen atom = [tex]5\times1=5[/tex]

Total valence electrons = 3 + 5 = 8

So, the calculation above is shown only the first option. So, (1) Lewis electron-dot diagram correctly represents the reactant containing nitrogen in the equation.

To know more about:-

brainly.com/question/20300458

balance the following equation FeC²+Cl². FeCl³​

Answers

Answer:

this equation is not proper see that where is the reactant.

Explanation:

give give a proper question and I will

if fecl2 + c2 gives a fecl3 where does the carbon compound go

Answer:

2FeCl2 + Cl2 → 2FeCl3

Explanation:

R4te me for 10 points and be honest with me PLEASE

Answers

Answer:

id give you and 8 or 9 but you are really pretty tho

Explanation:

i give you an 7 i am being honest i was gonna give you a 6 but then your hair is pretty

What is the noble gas configuration for zirconium?

Answers

Answer:

[Kr] 4d² 5s² option b will be correct answer

it is also called solution

Answers

Explanation:

In chemistry, a solution is a special type of homogeneous mixture composed of two or more substances. In such a mixture, a solute is a substance dissolved in another substance, known as a solvent. ... The term "aqueous solution" is used when one of the solvents is water.

Which of the following is the ground state electrons configuration of the F ion

Answers

Answer:

That leaves us with: 1s2 2s2 2p6 And that is the electron configuration for F- , the Fluoride ion.

Explanation:

plz give brainliest

Which of the following might be included in a chemical
reaction?
a
Molecules
blons
Pure elements
d
All of the above

Answers

Answer:

b) ions

Explanation:

Answer: all of the above

Explanation:

Why can't krypton and xenon separate during the separation of gases in the air?

Answers

Answer:

The remaining gas is a mixture of argon, neon, krypton, and xenon. Because these elements are chemically very unreactive, chemical means cannot be used to separate them.

Explanation:

Answer:

They're in Group 0 as they have full outer shells meaning they are chemically unreactive as they already have full outer shells meaning they don't want to lose or gain any electrons. Thus, they can't separate during the separation of gases in the air.

Electrons can occur only in specific

Answers

Answer: Electrons have wavelike motion and are restricted to certain energy states associated with specific wavelengths.

Why are electrons restricted to certain, discrete energy levels with an atom? Electrons have wavelike motion and are restricted to certain energy states associated with specific wavelengths.

When a gas is heated, the gas particles have more kinetic energy. Complete the following sentence: This means they move about more and have more ______ with the sides of the container. This increases the pressure.

Answers

Answer:

Contact

Explanation:

As the speed of the particles increases, they move around more, which means they hit the sides of the container more.

when a substance like sugar dissolves in water, the particles intermingle. This is possible because the particles of sugar
a)have spaces between them
b)have strong attractions to eachother
c)are pure
d)are vaporized

Answers

Answer:

A

Explanation:

Balance the folowing equation.
S + 02
ws
SO:

Answers

Answer:

s+o2=so2

Explanation:

i hope it will help u

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