Honors Chemistry Unit 3

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Questions and Answers

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?

A chemical change that involves a rearrangement of the ways in which atoms are grouped.

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?

<p>Chemicals present before the reaction.</p> Signup and view all the answers

What are products?

<p>Chemicals formed by the reaction.</p> Signup and view all the answers

Making sure the equation for a reaction obeys the law of conservation of matter is called ____________.

<p>balancing the chemical equation</p> Signup and view all the answers

Match the physical states indicated in equations with their symbols:

<p>Solid = (s) Liquid = (l) Gas = (g) Aqueous solution = (aq)</p> Signup and view all the answers

Atoms are neither ____________ nor ____________, they are just ____________ ____________.

<p>created, destroyed, grouped differently</p> Signup and view all the answers

What are the steps to write and balance chemical equations?

<ol> <li>Read the description and identify reactants and products. 2. Write the unbalanced equation. 3. Balance using guess and check. 4. Verify coefficients balance the equation.</li> </ol> Signup and view all the answers

What is the smallest particle of a molecular compound or a diatomic element?

<p>A molecule.</p> Signup and view all the answers

What is the smallest particle of an ionic compound referred to as?

<p>A formula unit.</p> Signup and view all the answers

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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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