Chemical Reactions

During a reaction, atoms are

• created

• destroyed

• neither created or destroyed - just rearranged

a substance that is formed as the result of a chemical reaction is called

• Product

• Reactant

• Starters

• Enders

How would you describe this chemical formula?

3O = ​ (a)  

3O₂ = ​ (b)  

• 3 Oxygen elements

• 3 Oxygen compounds

• 3 oxygen molecules
• 3 oxygen atoms

How would you describe this chemical formula?
3 H₂O

• 3 H₂O molecules

• 3 H₂O atoms
  

• 3 H₂O elements

• 3 H₂O parts

A chemical reaction is when...

• Atoms and molecules are destroyed

• Atoms and molecules are created

• Atoms and molecules break apart and regroup to form new products

• Atoms and molecules go on vacation and relax a little

Which chemical equation matches the model shown?

• 3C + 4O --> 3CO₂

• 3C + 2O₂ --> 3CO₂

• C₃ + 4O --> 3CO₆

• C₃ + 2O₂ --> 3CO₆

Number placed in front of an element symbol or chemical formula in an equation.

• coefficient

• product

• reactant

• synthesis

In the equation,          2Mg + O₂ ---> 2MgO, which are the reactants?

• Mg and O₂

• MgO
• Mg and MgO
• O₂ and MgO

What tells you how many molecules are present?

• reactant

• product

• subscript

• coefficient

What are the products of the chemical reaction pictured?

• CH₄ and CO₂

• CH₄ and O₂

• CO₂ and H₂O

• O₂ and H₂O