Chemical Equations

__CH₄ + __O₂ --> __CO₂ + __H₂O

What are the reactants in this equation?

• CH₄

• O₂

• CO₂

• H₂O

__CH₄ + __O₂ --> __CO₂ + __H₂O

Which of these molecules is an element?

• CH₄

• O₂

• CO₂

• H₂O

__CH₄ + __O₂ --> __CO₂ + __H₂O

Which molecule is made of 5 atoms?

• CH₄

• O₂

• CO₂

• H₂O

__CH₄ + __O₂ --> __CO₂ + __H₂O

which 2 molecules are made of 3 atoms?

• CH₄

• O₂

• CO₂

• H₂O

__CH₄ + __O₂ --> __CO₂ + __H₂O

which molecule is water?

• CH₄

• O₂

• CO₂

• H₂O

__CH₄ + __O₂ --> __CO₂ + __H₂O

which molecule is carbon dioxide?

• CH₄

• O₂

• CO₂

• H₂O

__CH₄ + __O₂ --> __CO₂ + __H₂O

which molecule is methane

• CH₄

• O₂

• CO₂

• H₂O

​ (a)   CH₄ + ​ (b)   O₂ --> ​ (c)   CO₂ + ​ (d)   H₂O

which molecule(s) require a 2 in front of them to balance the equation?

• 1
• 2
• 3
• 4

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