Balancing Chemical Equations

Chemical Equations

100

This is the name for the chemicals present before the chemical reaction begins.

What is reactants?

200

Los productos de una reacción química se pueden encontrar en este lado de una ecuación.

¿Qué es el lado derecho?

300

These are the reactants in the equation for photosynthesis:

6CO₂ + 6H₂O --> C₆H₁₂O₆ + 6O₂

_{carbon dioxide + water --> glucose + oxygen}

What is 6CO₂ + 6H₂O or carbon dioxide and water?

400

This is the name for the larger numbers in the equation that appear before the molecules

What is coefficient?

500

This law states that matter cannot be created or destroyed during a chemical reaction

What is the Law of Conservation of Matter?

Valence electrons

100

The number of valence electrons that carbon has

What is 4?

200

The number of valence electrons that most atoms need to be stable?

What is 0 or 8?

300

Draw the Lewis Dot structure for Sulfur (S)

(use a mini whiteboard)

The letter S with 6 dots surrounding it

400

The number of valence electrons that a nitrogen atom wants to gain

What is 3?

500

El número de electrones que pueden caber en el primer anillo de electrones.

¿Qué es dos?

Balancing Chemical Equations

100

¿Qué elemento no está equilibrado en la siguiente ecuación?

2KClO₃ ---> 2KCl + 2O₂

¿Qué es el oxígeno?

200

The number of atoms of hydrogen in 3C₂H₅

What is 15?

300

The coefficient for H₂ in the following reaction: _____H₂ + O₂ ---> 2H₂O

What is 2?

400

Balance the following equation: 1C₃H₈ + _____O₂ ---> 3CO₂ + ____H₂O

1C₃H₈ + 5O₂ ---> 3CO₂ + 4H₂O

500

Equilibre la siguiente ecuación.: ____P + _____O2 --->_____P2O5

4P + 5O2 ---> 2P2O5

What is the evidence that a chemical reaction is taking place?

100

Mixing baking soda and vinegar

What is the creation of CO₂ bubbles

200

Combustion of wax and oxygen

The flame

300

¿Qué pruebas hay de que se esté produciendo una reacción química en tu proyecto de fermentación?

Sabor agrio, presencia de burbujas de CO2, o mal olor.

400

Reaction of iron with oxygen in the presence of water, for example an old iron bridge

What is the formation of rust?

500

This kind of reaction involves two dissolved substances reacting to make an insoluble substance. (ex. sodium carbonate and magnesium sulfate producing magnesium carbonate)

What is a precipitation reaction?