Smarter Balance Science Review

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

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

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

Balance this equation:  H₂ + N₂ → NH₃

•  H₂ + 4N₂ → NH₃
•  H₂ + 3N₂ → 2NH₃
•  3H₂ + N₂ → 2NH₃
•  2H₂ + 2N₂ → 2NH₃

Tags

NGSS.HS-PS1-7

The red numbers in the image below represent ________

• subscripts
• coefficients
• I don't know, and don't want to try
• None of the answers are correct

Tags

NGSS.HS-PS1-7

The blue numbers in the image below represent ________

• I don't know, and don't want to try
• coefficients
• subscripts
• none of the answers are correct

Tags

NGSS.HS-PS1-7

What is the arrow in a chemical equation...
H_{2 +} O --> H₂O

• Reactants
• Products 
• Yields 
• Chemical Equation 

Tags

NGSS.HS-PS1-7

How many Sodium (Na) are in 6NaCl?

• 1
• 12
• 6

Which is a Synthesis Reaction?

• A + B ----> AB
• AB -----> A + B
• AB + CD ----> AC +BC
• AB+ C ----> AC + B

Which is a Decomposition Reaction?

• AB --> A + B
• ab ----> a + B
• AB + CD ----> AC +BC
• AB+ C ----> AC + B