Chemical Reactions

Which is the name of the kind of solid substance formed in this figure?  

• aqueous 
• precipitate
• acid
• synthesis 

What type of chemical reaction takes place when fluorine reacts with sodium bromide?

• single replacement 
• double replacement 
• combustion
• synthesis 

What are the correct coefficients when this equation is balanced?
KClO₃  --> KCl  +  O₂

• 2,2,2
• 2,2,3
• 1,2,3
• 3,3,3

Which statement is not a description of a chemical reaction?

• A solid is dropped into a beaker of liquid and a gas is released.
• Two liquids are mixed in a beaker and a solid forms at the bottom of the beaker.
• A solid is dropped into a beaker of liquid and an explosion occurs.
• A liquid is heated in the sun and half of it evaporates.

In a chemical reaction

• The atoms of the reactants always stay together to form the products
• The atoms of the reactants unbond, rearrange, and then rebond to form the products
• New atoms are formed which combine to make the products
• Some atoms disappear while others multiply to form the products

Which of the following options correctly balances the equation below?
__HNO₂ + __O₂ --> __HNO₃

• 4, 1, 4
• 1, 2, 1
• 1, 2, 1
• 2, 1, 2

What type of reaction is illustrated below?
2HI --> H₂  +  I₂

• synthesis
• decomposition
• single replacement
• double replacement

What type of reaction is illustrated below?

Zn + H₂S --> ZnS + H₂

• synthesis

• decomposition

• single replacement

• double replacement

2 NH₃+ H₂SO₄ ----> (NH₄)₂SO₄

• Synthesis (or combination)
• Decomposition
• Single displacement
• Double displacement

2 NaBr + Ca(OH)₂ ---->  CaBr₂ + 2 NaOH

• Synthesis (or combination)
• Decomposition
• Single displacement
• Double displacement