Science Teacher

Chemistry
-->Atomic structure

As long as an electron moves in an a particular orbit it doesn't lose it energy

A. Yes
B. No
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Chemistry FAQ

A frequently asked question;

Q: How do you even know a reaction is endothermic or exothermic ?

------'Answer '--------

You can deduce if a reaction is exothermic or endothermic from the heat change or enthalpy of the system.
By system, I mean reaction.
Now what is enthalpy or heat change ? Enthalpy is the heat content available in a reaction or system. It is also the amount of energy available in the system.
The symbol from heat change or enthalpy is delta H or a triangle shape written beside an H.
(Check previous post for that).
Now a reaction is EXOTHERMIC if the enthalpy is written in negative figure e.g (delta H = -189°C)
A reaction is ENDOTHERMIC if the enthalpy is written in positive figure e.g (delta H = 189°C)

You can also deduce if a reaction is exothermic or endothermic from the information given in questions.
A question could come in the form ;
The reaction between Nitrogen and Hydrogen to form ammonia gives off heat to the surrounding. What is the coefficient of the heat change or heat type reaction is it ?
The answer is simply exothermic and negative.
The coefficient of the heat change will be negative because it gives off heat to the surrounding a major characteristics of exothermic reaction. (check previous for the definition of exothermic reaction).

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Questions on the previously taught today's Biology

DIR: try to answer

1. Which information is given in a species name
A. genus and order
B. Division and genus
C. genus and species identifier
D. Species identifier and phylum

2. To which level of classification does a group closely related species of organisms belong ?
A. Class
B. Order
C. Genus
D. Kingdom

3. Every organism is group under the

A. Kingdom monera , protista , fungi , plantae , animalia
B. Bacteria , Archea and Eukarya
C. Kingdom animalia
D. Domain eukarya