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Intro to Chemical Reactions

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Rachel Esquibel

on 7 December 2018

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Transcript of Intro to Chemical Reactions

Evolution of heat and light
Formation of a gas
Formation of a precipitate
Color change
Signs of a Chemical Reaction
A+B  C+D
Chemical Equations
3CO2 
2Mg 
4MgO 
Describing Coefficients:
individual atom = “atom”
covalent substance = “molecule”
ionic substance = “unit”
Describing Equations
I will describe what occurs in chemical reactions by writing chemical equations to show the relationship between the reactants and products.

Writing & Describing Chemical Equations
Class Activity - Practice

Construct a lewis structure of the following compounds:

MgCl2 and NH3
What is different in the construction of these two compounds? Why?

33. 11/10/14 Writing & Describing Chemical Reactions 59-60
Date Lecture/Lab/Activity Pg#
Table of Contents
atoms can only rearrange
total mass stays the same
36 g
32 g
4 g
4 H
2 O
4 H
2 O
mass is neither created nor destroyed in a chemical reaction
Law of Conservation of Mass
Zn(s) + 2HCl(aq)  ZnCl2(aq) + H2(g)
How many?
Of what?
In what state?
How many?
Of what?
In what state?
Two atoms of aluminum react with three units of aqueous copper(II) chloride to produce three atoms of copper and two units of aqueous aluminum chloride.
Writing Equations
Remember the diatomic elements.
In what state? - physical state
Of what? - chemical formula
How many? - coefficient
2H2(g) + O2(g)  2H2O(g)
Identification of elements/compounds involved in the reaction
Use symbols to show:
Writing Equations
Writing & Describing Chemical Reactions
Practice Activity
matter can only be transformed
matter can be lost as heat/gas
Describing from the equation
For each of the following reactions, write a chemical equation to match the given description. Be sure to address: How many? Of what? In what state?

1. Two atoms of lithium react with two molecules of liquid water to produce two units of aqueous lithium hydroxide and one molecule of hydrogen gas.
2. When heated, a unit of solid calcium carbonate yields a unit of solid calcium oxide and a molecule of carbon dioxide gas.

For each of the following reactions, write a description of the given chemical equation. Be sure to address: How many? Of what? In what state?

3. 2Na(s) + Cl2(g) --> 2NaCl(s)
4. 2Fe(s) + 2H2O(l) + O2(g) --> 2Fe(OH)2(s)
5. Draw a diagram representing the reaction in #4. Differentiate between elements using labels or different colors. How does this diagram demonstrate the law of conservation of mass?
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