# Free Online Chemistry Homework Help Chat

**No answers ... yet!**

Jackson's age is 2/3 of peter's age. If peter's age is 63 years find age of Jackson.

Sir I've try to solve this question but I'm not confirm that is it right or wrong Peter's age = 63 Jackson's age ...

4 hours ago | Raza from New York, NY | 0 Answers | 0 Votes

Math Word Problem Please Solve### Susan C.

Gastonia, NC

A bicycle tire completes 9/10 of a revolution every 1/3 second. How many revolutions will the tire complete every minute? Show your work.

I need the work done for school.

yesterday | Caitlyn from North Bergen, NJ | 1 Answer | 0 Votes

Math Word Problem### Andrew M.

Palm Bay, FL

Express -343/512 as a power of rational numbers

Please give the answer quickly

1 hour ago | Aditya from New York, NY | 1 Answer | 0 Votes

EXPONENT### Andrew M.

Palm Bay, FL

each border is charged 3800 a month for board and lodging. If there are 12 boarders, how much will the owner of the boarding house earn in one half year?

Kindly show solution for the problem.

2 hours ago | Jessalyn from Bethel, ME | 1 Answer | 0 Votes

Math Problem### Andrew M.

Palm Bay, FL

. Regina scored 84% on a test. She answered 63 items correctly. How many items did Regina answer incorrectly? 1 point

I really have no idea what the heck to say but its fine ill just keep talking about random stuff like i thought my baby cousin how to walk.

1 hour ago | Prince from Baldwin Park, CA | 1 Answer | 0 Votes

Math Word Problem**No answers ... yet!**

How to prove that the limit lim_{(x,y)->(1,2)} (e^{y(x-1)}-1)/(1-x)(y+1) exists and equal to -2/3 ?

Prove that

55 minutes ago | Andrei from New York, NY | 0 Answers | 0 Votes

Calculus 2### Mark M.

Carson, CA

Can you use • in scientific notation?

Hello, this question might not be worth your time but regardless, I'm going to still ask it. Recently, I had a test with exponents that wasn't hard for me...

yesterday | Fardeen from Arlington, VA | 2 Answers | 1 Vote

#scientificnotation #multiplication### Andrew M.

Palm Bay, FL

Archaeologists discovered that the 18th century garden of the Charles Carroll House in Annapolis Maryland was a right triangle. The long leg of the triangle was

Archaeologists discovered that the 18th century garden of the Charles Carroll House in Annapolis Maryland was a right triangle. The long leg of the triangle was formed by a 400ft. long sea wall. The...

2 hours ago | Patricia from Santa Rosa, CA | 1 Answer | 0 Votes

Pythagorean Theorem### Andrew M.

Palm Bay, FL

A rectangle lawn measures 60ft by 80ft. Part of the lawn is torn up to install a sidewalk of uniform width around it. The area of the new lawn is 2400 ft 2. How

A rectangle lawn measures 60ft by 80ft. Part of the lawn is torn up to install a sidewalk of uniform width around it. The area of the new lawn is 2400 ft 2. How wide is the sidewalk?

2 hours ago | Patricia from Santa Rosa, CA | 1 Answer | 0 Votes

Area Of Rectangle**No answers ... yet!**

I need to find the diameter of a smaller circle J that is internally tangent to circle O and externally tangent to circle P and Q.

If circles P and Q are congruent and are internally tangent to circle O externally tangent to each other at point O. Circle J is internally tangent to circle O and externally tangent to both circle...

6 hours ago | Michelle from Chicago, IL | 0 Answers | 0 Votes

Pre-calculus Word Problems**No answers ... yet!**

A science class has girls and boys in the seventh grade and girls and boys in the eighth grade. The teacher randomly selects a seventh grader and an ei

A science class has 3 girls and 7 boys in the seventh grade and 9 girls and 3 boys in the eighth grade. The teacher randomly selects a seventh grader and an eighth grader from the...

2 hours ago | Melissa from Columbus, OH | 0 Answers | 0 Votes

Probability Of Independent Events**No answers ... yet!**

Calculate the Mean of X, Variance of X

If students scores X of 60% and 80% in an examination correspond to the standard scores of -0.58 and 1.42 respectively, Calculate the mean of X, the variance of X and the probability that a student...

1 hour ago | Collins from New York, NY | 0 Answers | 0 Votes

Binomial DistributionNormal DistributionPoison Distribution### Andrew M.

Palm Bay, FL

A cat that was initially 12 kg reduces its weight by 10% each month. How long does it take for the cat to be at least 6 kg lighter than its original weight?

initially 12 kg reduces its weight by 10% each month

1 hour ago | Clara from Lake Worth, FL | 1 Answer | 0 Votes

Word Problem### Andrew M.

Palm Bay, FL

A rectangular parking lot is 50ft longer than it is wide. Determine the dimensions of the parking lot if the diagonal distance from corner to corner of the lot

A rectangular parking lot is 50ft longer than it is wide. Determine the dimensions of the parking lot if the diagonal distance from corner to corner of the lot is 250ft.

3 hours ago | Patricia from Santa Rosa, CA | 1 Answer | 0 Votes

Pythagorean Theorem### Mark M.

Carson, CA

what is the sum of 19 but diffrence of 7?

19 - ? =7 7 + ? = 19

yesterday | Frfr from Richmond, VA | 1 Answer | 0 Votes

Love Dog### Ally L.

Lubbock, TX

If jack is 5 1/4 younger than Mike. Nate is 11 1/2 older than jack. To the nearest year, what is the difference in Mike age and Nate age?

need some help -_-

yesterday | Angel from Largo, FL | 1 Answer | 0 Votes

Math Word Problem**No answers ... yet!**

how many people in tunisia live in the sahara desert region?

I am learning about food security in Tunisia and need to see how many people are situated in the Sahara desert that live in Tunisia

2 hours ago | Sophie from New York, NY | 0 Answers | 0 Votes

Tunisia**No answers ... yet!**

How to minus 104-98. 6

Step of 104-98. 6

2 hours ago | Ansa from New York, NY | 0 Answers | 0 Votes

**No answers ... yet!**

Probability that a carton of six bottles will weight more than 7.4 kg

The weight of a bottle of red wine is normally distributed with mean 1.2 kg and standard deviation 200 g. Cartons that can hold six bottles have a mean weight of 20 g. The weight of the cartons is...

2 hours ago | Asri from Lexington, KY | 0 Answers | 0 Votes

### Arturo O.

Melbourne, FL

Write the slope intercept form of the equation of the line that passes through the point (2, -3) and (7, 10

I don't know how to do it

yesterday | Ty from Columbia, SC | 1 Answer | 0 Votes

GeometryChemistry mainly deals with **chemical** and **physical changes** associated with any substances. All chemical changes can be represented with the help of chemical equations which are symbolic representations of chemical reactions. The physical changes are mainly associated with the change in state of matter. It also provides necessary information related to the physical state of matter with their inter-conversion into each other.

Chemistry explains the atomic structure of any substance with the help of atomic models and theories. These concepts help us to understand some common concepts which we can observe in our surroundings such as cooking, burning, melting of ice etc. These are either chemical changes or physical changes. But how can you identify them? Definitely the subject can help you with this.

You can take help of online tutor to understand the basic concepts of chemistry such as atomic models, atomic theories, thermodynamic, Thermochemistry, chemical kinetics etc. All these topics are connected with each other and easy to understand if you are aware about the basics of chemistry.

## What is Chemistry?

Back to TopIt is the study of matter and the ways in which matter changes.** Matter is anything that takes up space and has mass**. Therefore it takes in all that we see around, the chair we are sitting, the book we are reading, the clothes we are wearing and flowers on the windowsill. Matter appears in many different forms, including metals, plastics, ceramics, living plants and animals, clouds, oceans and stars.

**Basic Chemistry**

It helps to provide the amenities of good life but is at the core of our concept and preoccupation of life itself. Understanding basic chemistry is crucial to learning about physics. Chemical terms are used to explain the names and properties of polymers. Chemical structures determine the unique characteristics of polymers as well as their limitations.

**Symbols**

Chemical symbol is used to represent an atom of an element, as well as the element itself. In formulas showing composition or molecular structure the numerical subscript of the symbol of an element gives the number of atoms of the element in the molecule. A chemical symbol is a one or two letter designation for an element derived from the elements name.

## Branches of Chemistry

Back to TopThe field of chemistry has become so wide and complex that it is necessary to divide it into different branches for proper understanding. It is the science that studies atoms and molecules along with their properties. All matter is composed of atoms and molecules, so it is all encompassing and is referred to as the central science because all other scientific fields use its discoveries. The three major branches of chemistry are **Inorganic chemistry **- It is related with the study of metallic and non metallic elements and their compounds. Mainly it is based on non-living things.**Organic chemistry **- It is the branch which deals with chemical study of carbon compounds. It is essentially the chemistry of life processes.**Physical chemistry** - A branch which deals with the study of physical properties and constitution of matter, the laws of chemical reactions and the theories governing these reactions.

Other branches of chemistry are

**Biochemistry **- It explains the reactions of living processes, health and diseases

**Analytical chemistry** - Branch deals with various methods of analysis applicable to different types of chemical substances.

**Nuclear chemistry** - It deals with nuclear reactions, artificial transmutations of elements and radioactive isotopes.

**Industrial chemistry** - Branch applies principles of chemistry in large scale manufacture of various elements and compounds.

**Agricultural chemistry** - The branch of chemistry which is engaged in the study of soil, water, fertilizer and many other compounds which are of agricultural importance.

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