Podcast
Questions and Answers
Which of the following are evidence for a chemical reaction? (Select all that apply)
Which of the following are evidence for a chemical reaction? (Select all that apply)
- Color change (correct)
- Temperature stays constant
- Solid forms (correct)
- Bubbles form (correct)
What is a chemical reaction?
What is a chemical reaction?
A chemical change that involves a rearrangement of the ways in which atoms are grouped.
What does a chemical equation represent?
What does a chemical equation represent?
How you represent a chemical reaction with reactants on the left and products on the right.
What are reactants?
What are reactants?
What are products?
What are products?
Making sure the equation for a reaction obeys the law of conservation of matter is called ____________.
Making sure the equation for a reaction obeys the law of conservation of matter is called ____________.
Match the physical states indicated in equations with their symbols:
Match the physical states indicated in equations with their symbols:
Atoms are neither ____________ nor ____________, they are just ____________ ____________.
Atoms are neither ____________ nor ____________, they are just ____________ ____________.
What are the steps to write and balance chemical equations?
What are the steps to write and balance chemical equations?
What is the smallest particle of a molecular compound or a diatomic element?
What is the smallest particle of a molecular compound or a diatomic element?
What is the smallest particle of an ionic compound referred to as?
What is the smallest particle of an ionic compound referred to as?
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Study Notes
Evidence of a Chemical Reaction
- Signs include color change, formation of solid (precipitate), gas bubbles, heat or flames produced, and heat absorption.
Chemical Reaction
- Represents a chemical change involving the rearrangement of atom groupings.
Chemical Equation
- A representation of a chemical reaction with reactants on the left and products on the right of an arrow.
Reactants
- The substances that are present before a chemical reaction occurs.
Products
- The substances that are formed as a result of a chemical reaction.
Balancing Chemical Equations
- Ensures compliance with the law of conservation of matter by balancing the number of atoms on both sides of the equation.
Physical States in Equations
- Various physical states are indicated with symbols:
- (s) for solid
- (l) for liquid
- (g) for gas
- (aq) for aqueous solution (dissolved in water)
Conservation of Atoms
- Atoms are neither created nor destroyed; they are simply rearranged in different configurations during reactions.
Writing and Balancing Chemical Equations
- Steps to write and balance:
- Read the chemical reaction description to identify reactants, products, and their states; write corresponding formulas.
- Write an unbalanced equation summarizing the noted information.
- Balance the equation using trial and error, starting with the most complex molecule.
- Verify that the coefficients used reflect an equal number of each type of atom on both sides.
Molecular and Ionic Compounds
- The smallest particle of a molecular compound or diatomic element is identified as a molecule.
- The smallest particle of an ionic compound is referred to as a formula unit.
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