1.2 Modeling Chemical Reactions Notes

Multiple Choice

The left side of the equation below is called

• Products

• Reactants

Multiple Choice

How many carbon atoms are present on the reactant side? C_{2 +} O₂ ⇢ CO₂

• 0

• 1

• 2

• 3

Multiple Choice

What is the Law of Conservation of Mass?

• It states that no matter can be created or destroyed.

• It states that no energy can be created or destroyed.

• It states that matter can be created or destroyed.

• It states that no sound can be created or destroyed.

Multiple Choice

What is a coefficient?

• The small number on the right of the chemical symbol.

• The large number in front of a chemical formula.

• The number in between the chemical symbols.

• The number behind a chemical formula.

Multiple Choice

What is the little number after an element in a chemical equation called.
Example: H₂

• Coefficient 

• Subscript

• Atom

• Equation

Multiple Choice

How many elements are in C₆H₁₂O₆?

• 1

• 2

• 3

• 4

Multiple Choice

Which of the following symbols is NOT a correct indication of the phase of a substance in a reaction?

• (s)=solid

• (g)=grams

• (l)=liquid

• (aq)= aqueous

Multiple Choice

In a chemical equation the symbol ( + ) means.....

• plus

• add

• and

Multiple Choice

What part of the equation does the #1 represent?

• product

• produces/yields

• solid

• reactant

Multiple Choice

What does this symbol Δ above the arrow mean?

• a precipitate is form

• heat is supplied

• a calalyst is needed

• electricity is needed

Multiple Choice

Is the following equation balanced?...
Al + O₂ --> 2Al₂O₃

• Yes!

• No!

Multiple Choice

Is the following equation balanced?
2C₂H₂ + 5O₂ --> 4CO₂ + 2H₂O

• yes

• no

Multiple Choice

Which factors increase the rate of a reaction.

• increasing temperature

• increasing concentration

• increasing surface area

• all of these

Multiple Choice

During evaporation, water absorbs heat so that bonds can break and water vapor forms. This is an example of an _____________ reaction.

• endothermic

• exothermic