PS Do Now 4/27

__CH₄ + __O₂ --> __CO₂ + __H₂O

What are the reactants in this equation?

• CH₄

• O₂

• CO₂

• H₂O

When writing a chemical equation, reactants are on the _____________ while products are on the _________________.

• top, bottom

• right, left

• left, right

• bottom, top

In a chemical equation...

• a new substance is formed

• new atoms are formed

• old atoms disappear

• a equal sign is always used

What is the Law of Conservation of Mass?

• It states that matter cannot be created or destroyed.

• It states that energy cannot be created or destroyed.

• It states that matter can be created or destroyed.

• It states that sound can be created or destroyed.

Chemical Equation

• A way to represent a molecule by identifying the elements and the number of atoms or ions.

• An ion with two or more atoms.

• A way to show the overall process that occurs in a reaction as chemical go from reactant to product.

• An atom or molecule that has a positive or negative charge due to losing or gaining an electron.

Which molecules are the reactants in the following chemical reaction. (CHECK ALL THAT APPLY)

2C₂H₆ + 7O₂ →4CO₂ + 6H₂O

• C₂H₆

• H₂O

• O₂

• CO₂

Which molecules are the products in the following chemical reaction. (CHECK ALL THAT APPLY)

2C₂H₆ + 7O₂ →4CO₂ + 6H₂O

• C₂H₆

• H₂O

• O₂

• CO₂