Explanation:
4.1 The Chemical Equation
LEARNING OBJECTIVES
Define chemical equation.
Identify the parts of a chemical equation.
A chemical reaction expresses a chemical change. For example, one chemical property of hydrogen is that it will react with oxygen to make water. We can write that as follows:
hydrogen reacts with oxygen to make water
We can represent this chemical change more succinctly as
hydrogen + oxygen → water
where the + sign means that the two substances interact chemically with each other and the → symbol implies that a chemical reaction takes place. But substances can also be represented by chemical formulas. Remembering that hydrogen and oxygen both exist as diatomic molecules, we can rewrite our chemical change as
H2 + O2 → H2O
This is an example of a chemical equation, which is a concise way of representing a chemical reaction. The initial substances are called reactants, and the final substances are called products.
Unfortunately, it is also an incomplete chemical equation. The law of conservation of matter says that matter cannot be created or destroyed. In chemical equations, the number of atoms of each element in the reactants must be the same as the number of atoms of each element in the products. If we count the number of hydrogen atoms in the reactants and products, we find two hydrogen atoms. But if we count the number of oxygen atoms in the reactants and products, we find that there are two oxygen atoms in the reactants but only one oxygen atom in the products.
What can we do? Can we change the subscripts in the formula for water so that it has two oxygen atoms in it? No; you cannot change the formulas of individual substances because the chemical formula for a given substance is characteristic of that substance. What you can do, however, is to change the number of molecules that react or are produced. We do this one element at a time, going from one side of the reaction to the other, changing the number of molecules of a substance until all elements have the same number of atoms on each side.
To accommodate the two oxygen atoms as reactants, let us assume that we have two water molecules as products:
H2 + O2 → 2H2O
The 2 in front of the formula for water is called a coefficient. Now there is the same number of oxygen atoms in the reactants as there are in the product. But in satisfying the need for the same number of oxygen atoms on both sides of the reaction, we have also changed the number of hydrogen atoms on the product side, so the number of hydrogen atoms is no longer equal. No problem—simply go back to the reactant side of the equation and add a coefficient in front of the H2. The coefficient that works is 2:
2H2 + O2 → 2H2O
There are now four hydrogen atoms in the reactants and also four atoms of hydrogen in the product. There are two oxygen atoms in the reactants and two atoms of oxygen in the product. The law of conservation of matter has been satisfied. When the reactants and products of a chemical equation have the same number of atoms of all elements present, we say that an equation is balanced. All proper chemical equations are balanced. If a substance does not have a coefficient written in front of it, it is assumed to be 1. Also, the convention is to use all whole numbers when balancing chemical equations. This sometimes makes us do a bit more “back and forth” work when balancing a chemical equation.
AY! P.ADLET IS WORKING FOR ME AGAIN!!!!
If P.adlet got blocked for you, check it!
Answer: i need pointsssss
Explanation:
sorry );
Answer:
whats your pa.d.let name
Explanation:
What is a coda?
Select one:
a.
An addition to the music at the very end of the piece
b.
The main theme in a sonata form
c.
The opening of a symphony
d.
A stringed instrument used for concertos
Answer: A. an addition to the music at the end of the piece
Explanation: Coda's happen at the end of something
Answer:
A coda is: A. An Addition to the music at the very end of the piece.
music from the earliest time periods were written mostly for this reason
Entertainment
Academic study
Religion
Fame and fortune
Answer:
Religion
Explanation:
There is not much information familiar about periods of prehistoric music and its use. Scientists theorize that music was firstly used to present animal sounds in religious rituals and rites.
The oldest song that is preserved comes from the ancient period and it is the hymn. So-called Hurrian songs were found at the place of today’s Syria, and they present hymns to various Semitic gods and goddesses.
It is also found that many of the early languages have words for music that overlap with the words from religion and cult, which also accents their connection.
In ancient Egypt, music was also closely tied with religion. They used chants and songs in the rituals and magical performings, as well as during the rites for cults of gods. They even had the goddesses connected with the music, like Bat and Bastet.
THIS IS FOR ART CLASS! I need to know if it is good to turn in
Answer:
yeah sure kid
Explanation:
I HAVE ONLY 2 MIN LEFT PLEASEEE
The next question refers to the following passage. The sentences have been numbered to help you identify them more easily.
(1) As she was driving to visit her twin, Jayla had a strange feeling that something bad was going to happen.
(2) Meanwhile, Kayla had the same exact premonition.
(3) Worried about her sister, Kayla called Jayla's cell phone.
(4) Because she took her eyes off the road to answer the phone call, Jayla lost control of her car and crashed through the front of Kayla's house.
Which sentence features an introductory clause that explains why the main action happened? (5 points)
Sentence 1
Sentence 2
Sentence 3
Sentence 4
9.
The next question refers to the following passage. The sentences have been numbered to help you identify them more easily.
(1) As she was driving to visit her twin, Jayla had a strange feeling that something bad was going to happen.
(2) Meanwhile, Kayla had the same exact premonition.
(3) Worried about her sister, Kayla called Jayla's cell phone.
(4) Because she took her eyes off the road to answer the phone call, Jayla lost control of her car and crashed through the front of Kayla's house.
Which sentence features an introductory phrase that explains why the main action happened? (5 points)
Sentence 1
Sentence 2
Sentence 3
Sentence 4
Answer:
Which sentence features an introductory clause that explains why the main action happened? its 3, Worried about her sister, Kayla called Jayla's cell phone.
Which sentence features an introductory phrase that explains why the main action happened? its 4 Because she took her eyes off the road to answer the phone call, Jayla lost control of her car and crashed through the front of Kayla's house.
good luck:D
what is an archetype?
a. architecture
b. an old building
c. a model for something
d. a leader
i’ll give brainliest
Answer: C. A model for something
Explanation: An archetype is something like a trope, a set group of characteristics for a character type
What exercises can be done to improve the movement opening/closing blinds. weird I know
Answer:
You are basically moving your hand. Moving your hand muscle.
Explanation:
Answer:
you are moving your muscles in and out
Explanation:
your mother told you that you were going to the hospital today and you are nervous about it and so the doctor said for you to move around and close your eyes and tell her what you see
it is an enclosed area made when both ends of lines meet or close.
A. color
B. texture
C. shape
D. line
Aight so..
Who is the best Hunterxhunter character?
Answer:
killua or hisoka ofc
Explanation:
Answer:
ALL OF DEM BABIES
Explanation:
Read this plz...
"In the forest, there was a crooked tree and a straight tree. Every day, the straight tree would say to the crooked tree, ' Look at me... I'm tall, and Im handsome or beautiful. Look at you... you're all crooked and bent over. No one wants to look at you.' And they grew up in that forest together. And then one day the loggers came, and they saw the crooked tree and the straight tree, and they said, 'Just cut the straight trees and leave the rest.' So the loggers turned all the straight trees into lumber and toothpicks and paper. And the crooked tree is still there, growing stronger and stranger every day. Plz everyone treat people the way you would want to be treated. You don't know what people are going though. And thank you for being yourself...❤️❤️❤️
. What is an obelisk and what was its purpose?
Answer:An obelisk is a stone rectangular pillar with a tapered top forming a pyramidion, set on a base, erected to commemorate an individual or event and honor the gods.
Explanation:
PLEASE HELP
MUSIC!!!
Answer:
I believe it is musical number.
Explanation:
Answer:
Musical number.
Explanation:
Musical numbers are songs, dances, or instrumental pieces throughout a larger piece of work.
When an artist applies pigments to plaster after the plaster mixture has dried, the paint does not bond with the wall and the paint will eventually flake away. What is this method of painting called
Answer:
Fresco-secco
Explanation:
I looked it up and this is what came up. Hopefully that may help. it can also just be called just fresco painting
Help me solve this problem please
Thats 2pt perspective
little children near and far don't know were your parents are cry directly in this jar __________________
Finish this pls
Answer:
I will drink it at the bar sip sippen on orphan tears.
Explanation:
This is for an art assignment does it look alright
Answer:
Explanation:
^^shoyo hinata here!!!!!!
Jirou! yes it look’s great!!!!! 1000000000000/10
Answer:
oh it looks alright
Explanation:
infact you are great.
may the Lord bless you
"O Romeo, Romeo, wherefore Art thou Romeo”
In thy bed with another woman, as I have foretold
Do not deny thy truth for I have already sang the song of sadness, when I saw you within that bed
“So Romeo would, were he not Romeo call’d, retain that dear perfection which he owed without that title”
this might not be school related but if you have read the wings of fire seriesthen plz friend me so I can talk about the books.
Answer:
Yeah cool for me
Explanation:
How many measures will this rhythm be divided into if you use a 4/4 time signature?
4/4 Time:
1 & 2 (&) 3 & a 4 / 1 2 3 e & a (4) / 1 (&) 2 (&) 3 (&) 4 (&) /
Seurat painted a_____ of classes
Please help
Write the rhythm
Answer:
1st measure: 1, +, 2, +, 3, + 4, +
2nd measure: 1, +, 2, +, 3, + 4, +
3rd measure: 1, +, 2, +, 3, + 4, +
4th measure 1, +, 2, +, 3, + 4, + :
Explanation: Rhythm in music is counted by beats. In this music sheet, the time signature is 4/4, which means each measure will have four beats. However, If we want to divide the measures into shorter notes, we use different figures. Each figure has its respective amount of subdivided beats, for example; In the first measure we have a quarter dotted note (1 & 1/2 beats), and then we have a quarter note (1 beat) to complete the 4 beats in the measure. Another example is in the second measure, we have an eighth note (1/2) and in the last measure we have a whole note (4 beats). Whenever a new figure starts, it is marked in bold.
FOR CULINARY ARTS
30. Which of these pricing methods is the riskiest?
a. markup-on-cost method c. factor method
b. contribution margin method d. competitors’ pricing method
Answer:
Competitors' pricing method :)
Explanation:
5. Egyptian art didn't use the element of space in a realistic way. Instead of using the depth of a landscape, parallel lines called ___________ were used to order the subjects in a piece.
Whats all of the notes on the piano
Answer: C, D, E, F, G, A, B
Explanation:
if you can have five farm animals, what would they be?
subject is art look at the photo
Answer:
Something through the sort of they all are texting their significant others or the person they like. I don't know, maybe I'm wrong, but I think that's what it is.
Explanation:
What was the inspiration for the piece above?
Answer:Explanation:
Answer:
you did not give the piece
Explanation:
What colors are not found in the light spectrum
Answer:
Colors such as white, black, and gray are not visible in the light spectrum.
Explanation:
For a human eye to perceive colors, there are certain colors from the electromagnetic spectrum that are visible and some that aren't. These colors are visible based on their certain wavelengths in the electromagnetic radiation level.
Depending on the wavelength of the light seen, colors are visible to the naked human eye. While colors like red, orange, yellow, green, blue, violet, and indigo are easily visible while neutral colors such as black, white, and gray are not.
All are purposes of drama but which one is NOT?
Answer:
make obscure entertainment enjoyable
Explanation:
who is dallon weekes
i have to write about a musician for music class and i got him