Balancing Chemical Equations Bio I

Open Ended

How does chemical reactions help organisms?

Multiple Choice

During chemical reactions bonds that are broken _____ energy.

• releases

• absorbs

• reactants

• products

Multiple Choice

In a chemical equation the substances on the left of the arrow are the _________.

• releases

• absorbs

• reactants

• products

​Practice: Circle reactants and underline products

2Mg + O₂ →2MgO

 

2H₂O → 2H₂ + O₂

 
C₆H₁₂O₆ + O₂→ CO₂ + H₂O

If 35 grams of sodium reacts with chlorine to form 50 grams of salt. How many grams of chlorine reacted?

               Na   +   Cl →   NaCl 

 

​If 150 g of water is separated into hydrogen and oxygen gas, and the hydrogen gas has a mass of 40 g. What is the mass of the oxygen gas produced?                                

  H₂O   →  H₂   +   O₂

Open Ended

Name the different types of energy.