Lesson: Chapter - 6

Reaction Types

Now that you are familiar with atoms and molecules and how they make up the solids, liquids, and gases we see around us, let’s discuss what happens when two molecules meet: namely, chemical reactions.

A chemical reaction is defined as a process by which one or more substances are changed into one or more new substances. Chemical reactions are usually portrayed in this way:

reactant ? product

The ? is read as “yields” or “produces.” You will often see the states of matter in parentheses as subscripts after the chemical formulas of the reactants and products. The symbols for the states of matter and some other chemical reaction symbols you should be familiar with are given in the table below.

Symbol Meaning
? “Yields” or “produces”
+ “Reacts with” or “and”
(g) Gaseous state
(l) Liquid state
(s) Solid state
(aq) Aqueous state (dissolved in water)
number subscript Represents the number of atoms of the element it’s to the right of
number coefficient How many molecules or moles of the substance are reacting
 A substance named above the arrow represents a catalyst in the reaction
? A gas is produced
? A precipitate is formed
kJ or J Energy term (kilojoules or joules)
Reversible equation; equilibrium
A delta above the reaction arrow indicates that heat is added to the reaction
Back Next

Next to display next topic in the chapter.

Practice Questions

Test Prep Lessons With Video Lessons and Explained MCQ

Large number of solved practice MCQ with explanations. Video Lessons and 10 Fully explained Grand/Full Tests.

Quantitative Aptitude Reasoning English General Knowledge Picture Patterns
More for You
MCQ with question Explanations Scholarships and Financial Aid

Data Sufficiency

Easily crack the most logical section of the GMAT

Synonyms

Develop skill for cracking Synonyms section of the test

Biology for Test Preparation

Prepare Biology for tests with lessons and practice mcq

All in this Category

You may be interested in

Colleges in Sialkot

A list of major colleges in the cit ...

MA Jinnah Group Of Colleges - Faisalabad

A big name in colleges in Faisalaba ...

UK Visa for International students

How you can get UK Visa for Interna ...

Study Abroad

How to go Abroad to study in a repu ...

GRE Bio-Chemistry

Find what is GRE Bio-Chemistry and ...

ISSB Speech Test

Learn all about ISSB Speech Test. H ...

PU University of the Punjab

The oldest university in Pakistan - ...

UAF University of Agriculture

The oldest agri university is Pakis ...

About us

EntryTest.com is a test preparation service for students seeking successful career.

About Disclaimer

Quick Test Prep

NUST NET IBA Karachi SAT LUMS LCAT LSE

 

NTS GAT NTS NAT GMAT GRE ACT

Study Abroad

Education Abroad Business Schools MS in USA