Chemical Reactions and Equations

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

• Mg and O
• MgO
• Mg and MgO
• O and MgO

Tags

NGSS.MS-PS1-2

Balance this equation,
Ca + H₂O --> CaO + H₂

• Ca + 2H₂O --> CaO + 2H₂
• 2Ca + H₂O --> CaO + H₂
• Its balanced as it is
• Cannot be balanced

Tags

NGSS.HS-PS1-7

Balance this equation,            
Al₂O₃ ---> Al + O₂ 

• Cannot be balanced
• 2Al₂O₃ ---> 2Al + 3O₂ 
• 2Al₂O₃ ---> 4Al + 3O₂ 
• 3Al₂O₃ ---> 2Al + O₂ 

Tags

NGSS.HS-PS1-7

Name this reaction, Cl₂ + 2KI _-->  I₂ + 2KCl

• Synthesis
• Single Replacement
• Double Replacement
• Decomposition

Predict this reaction,                
K₂O + H₂O --> ?

• KO₂ + H₂O
• KH₂O
• K₂OH₂O
• 2KOH

Tags

NGSS.HS-PS1-7

NGSS.HS-PS1-2

Name this reaction,
CO₂ + H₂O --> H₂CO₃ 

• Decomposition
• Single Replacement
• Synthesis
• Combustion

Write a balanced reaction of,  
Magnesium burns....

• 2Mg + 3O_{2 --> 3MgO}
• Mg + H₂O -- MgH
• 2Mg + CO₂ -- MgCO₂
• 2Mg + O₂ --> 2MgO

Tags

NGSS.HS-PS1-7

Predict this reaction,
HCl (aq) + RbOH (aq)  --> ?

• RbCl (aq) + H₂O (l)
• RbCl (l) + H₂O (aq)
• no reaction
• 2RbCl (s) + H₂O (g)

Tags

NGSS.HS-PS1-7

NGSS.HS-PS1-2

What does the (s) stand for in MgCO₃ (s)

• soluble
• salty
• insoluble
• gas

What does the (aq) stand for in NaCl (aq)?

• solid
• aqueous 
• liquid
• gas