Chemical Reactions

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

• aqueous 
• precipitate
• acid
• synthesis 

An element plus additional element reacts to form one product is an example of which type of chemical reaction? 

• combustion
• decomposition 
• synthesis 
• single replacement

Magnesium reacts with hydrochloric acid to produce magnesium chloride and hydrogen gas this happens because? 

• Magnesium is higher on the reactivity series then hydrogen
• magnesium is more reactive than hydrogen
• magnesium is able to break the bond between HCl and form MgCl₂
• both b and c are correct

Describes the number of molecules in a compound and is used to balance a chemical reaction. 

• coefficient 
• subscript
• superscript
• SI unit

Which type of reaction takes place in the presence of oxygen and produces carbon dioxide and water?

• double replacement 
• decomposition 
• combustion 
• single replacement

Provides evidence that a chemical reaction has occurred. 

• dissolving 
• melting
• formation of a gas
• bending

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

• single replacement 
• double replacement 
• combustion
• synthesis 

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)

Describes the number of atoms in a compound of each element. 

• coefficient 
• superscript 
• subscript 
• SI unit 

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