Chemical Reactions

  In a Chemical Reaction, the Law of Conservation of Mass states? 

• Matter is present.
• Matter is NOT created or destroyed.
• Matter is created and destroyed. 

What is an Element?

• An atom
• Basketball
• A pure substance
• 2 atoms joined together

What is a compound?

• two or more atoms combined 
• two or more molecules combined
• two or more elements combined
• two or more  combined

Which of the following is an unbalanced equation?

• CaCO₃ --> CaO + CO₂
• PbO₂ + 2H₂-->2Pb + H₂O
• 2Na+ 2H₂O-->2NaOH + H₂
• CS₂ + 2O₂ --> CO₂ + 2SO₂

Which is NOT an example of a compound?

• H₂O
• NaCl
• CO₂
• H

Which is the correct formula for:
one carbon (C)
two oxygen (O)

• CO₂
• CO
• C₂O
• 2CO

How many Sodium (Na) are in 6NaCl?

• 1
• 12
• 6

Solid magnesium, Mg, reacts with oxygen gas, O₂, to form the solid magnesium oxide, MgO. Which equation is a balanced chemical equation for this chemical change? 

• 2Mg + O₂ → 2MgO
• Mg + 2O → 2MgO
• Mg + O₂ → MgO₂
• Mg + O → MgO

2H₂ + O₂ --> 2H₂O What is the product?

• ------>
• 2H₂O
• 2H₂+ O₂

Tags

NGSS.MS-PS1-5

2H₂ + O₂ ---> 2H₂O What  are the reactants?

• ----->
• 2H₂O
• 2H₂ +O₂

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2