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

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

In chemical reactions, the law of conservation of mass is......

• disobeyed
• not true
• obeyed
• used sometime

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

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

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

• Synthesis
• Single Replacement
• Double Replacement
• Decomposition

  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. 

Which is a Synthesis Reaction?

• A + B ----> AB
• AB -----> A + B

Which is a Decomposition Reaction?

• AB --> A + B
• ab ----> a + B

A Precipitate forms

• when a gas is bubble through a liquid

• a lighter taper causes a gas to burn

• after a reaction and causes cloudiness (caused by a solid forming)

Predict the following reaction 
NaCl   +   Ca(NO₃)₂ --> 

• no reaction both products are aqueous 
• Calcium chloride and sodium nitrate are produced  
• sodium nitrate is a solid formed 
• calcium chloride is the solid formed

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which reaction between halogens and halide salts will occur?

• F₂(g)  +  FeI₂(aq) → FeF₂(aq)  +  I₂ (g)
• Cl₂(g) + SrF₂(aq)  → SrCl₂(aq)  +  F₂(g)  
• I₂(g)  + MgBr₂(aq)  → MnI₂(aq)  + Br₂(g)
• Br₂(l)  +  CoCl₂(aq) → CoBr₂(aq)  +  Cl₂(g)

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2