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

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.

Balance the folowing equation.
S + 02
ws
SO:

Answers

Answer:

s+o2=so2

Explanation:

i hope it will help u

What is the noble gas configuration for zirconium?

Answers

Answer:

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

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

I really need help I'm not good with science

Answers

Answer:

A!!!!!!!!

Explanation:

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.

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:

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.

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

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.

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:

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:

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

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!

Other Questions
what is the domain of the function represented by this graph? What does the teacher mean when she says concluding? Does she mean like i lut a concluding in each paragraph What do you think president truman wanted to convey to congress? Cargo shipping, an automobile manufacturer is preparin shipment of a cars andvtrucks on a cargo ship that can carry 21,600 tons The cars weigh 3.6 tons each and the trucks weihgt 7.5 tons each. 1. Wtite thevequation thatvrepresents the weight constraint of a shipment let be the number of cars and be the numbers of trucks. Turning off the water while brushing your Teeth saves 350 centilliters of water. How many liters of water can you save if you turn off the water the next 3 times you brush your teeth? (Round your answer to the nearest hundredth) Please help me need ASAP Mr Tan monthly salary is $2999.52. In order to fill up a membership application form, mr Tan has yo roping off his monthly salary to the nearest dollar. What should he write on the application form for his monthly salary? Can someone help me solve this (solution must contain a point (x,y). A well written Business Plan allows you to define and specify the exact target customers.A. TrueB.False I NEED HELP ITS KINDA EASY BUT NOT FOR ME I studied all week for hours and when I took the test I got 81% I really felt very bad. Could you tell me a few words? And he pictured his life, how he lived in two worlds.3Is this a metaphor? Why it's important to have or to know the deformation history of rock in a certain area? anyone no 8th grade math if so please help my sister out Find a solution to the linear equation 13x+y=26 DUE TODAY!!!!!!!!!!!!!!!!'How does this excerpt describe the Corrupt Bargain of 1824? Four major candidates ran in the 1824 election, all under the "Democratic-Republican" name. One of the candidates, Andrew Jackson, was already famous. In the 1780s, he earned the right to practice law and served in various offices of the state government, including senator. He earned the nickname "Old Hickory" for his toughness as a general during the War of 1812 and First Seminole War. Jackson supported slavery and "Indian removal." This earned him support from voters in southern and frontier states. The other three candidates were John Quincy Adams of Massachusetts, Henry Clay of Kentucky, and William Crawford of Georgia. U.S. presidents are elected through the Electoral College. The Founding Fathers worried that Americans were to spread out to learn enough about the candidates. Under the Electoral College, Americans cast their ballot for the popular vote, which chooses the electors for each state. The number of electoral votes each state equals the number of representatives and senators combined. The candidates must win an absolute majority of electoral votes to win the election. In 1824, Andrew Jackson won the popular vote, but he did not win it in each state. Jackson and Adams both won many electoral votes. Jackson won the most with 99. However, a candidate needs an absolute majority of electoral votes to win. In 1824, Jackson needed 131 to win. When there is not majority winner, the election goes to the House of Representatives. This has only happened twice in U.S. history. Even though he won the popular vote and many electoral votes, Andrew Jackson lost the presidency in 1824. John Quincy Adams was the Secretary of State currently. Henry Clay was the Speaker of the House of Representatives. Henry Clay, receiving the least, was left out. However, as a leader in the House of Representatives, he had influence over the other members. Clay openly hated Jackson and there were rumors that Clay made a deal with Adams in exchange for his support. The House election declared John Quincy Adams president. Soon, he chose Henry Clay to fill the seat he left vacant, Secretary of State. Jackson was shocked and enraged. Although there was no inquiry of possible wrongdoing, Jackson accused Adams and Clay of making a "corrupt bargain." John Quincy Adams was a disappointment as president. Many of his goals created divisions like federal funds for internal improvement. Some states thought that taking federal funds would force them to follow certain rules. They felt this reduced their rights as independent states. Jackson took advantage of issues like this one to gather more support. More Jackson supporters found their way to seats in Congress. He was as a man of the people and said Adams could never understand the common man's concerns. John Quincy Adams ran against Andrew Jackson in the 1828 election. Personal attacks grew even more vicious, but Andrew Jackson appealed to many. He believed government was for the common man. He believed in strict reading of the law and limited internal improvements. He also believed in states' rights. Andrew Jackson easily won the 1828 election, winning both the popular vote and most electoral votes. Historians note the sectional nature of the voting. Support for Jackson was concentrated in South while Adams' support was mostly in the North. Jackson was so popular because he brought changes to the government. He also wanted to make sure the government was responsible for its actions. Jackson pushed settlement into the frontier. He supported the Indian Removal act. He also defended the spread of slavery. Though his support was heavier in the South, he was determined to keep a unified nation. The rise and presidency of Old Hickory is memorable to Americans today. Write and equivalent expression for the following expression: ab Analyze the maps below and answer the question that follows. A world map titled Colonized Territories: 1945. The following are shaded: most of Africa, India, Guyana, Suriname, French Guiana, the Caribbean, Belize, Madagascar, Oceania, Bangladesh, Burma, Cambodia. Image by Aniraptor 2001 Map 1: Colonized Territories: 1945 A world map. The key shows Human Development Standing by color. Green = High Human Development, Yellow = Moderate Human Development, Red = Low Human Development. North America and Europe are dark green. Central America, the Caribbean, and South America are yellow, light green, medium green. Africa is yellow, orange, red, dark red, with small areas of light green. Australia is dark green. Asia is yellow, light green, medium green with areas of orange and dark red. Oceania is yellow and light green. Image by Marcos Elias Oliveira Junior Map 2: UN Human Development Index, 2009 Explain how the maps above depict the relationship between neocolonialism and human development. The variable in the equation 26 = 1 3r is r. Remembering the form ax + b = c, what are the values of the constants, a, b, and c in the equation? what is the highest level of nursing