Mr. Chaney Chemistry Unit 2 Test Review

Which of these is not a chemical reaction?

• Burning of wood
• Milk going bad
• Mixing vinegar and baking soda
• Melting of ice

A precipitate is a 

• liquid that forms when two solids are reacted
• a solid that forms when two liquids are mixed
• a gas that forms when vinegar and baking soda react
• a change of color in a solution

If reaction starts with 20g of reactants it should produce 

• a total of 40g of products
• a total of 10g of products
• a total of 80 g of products
• a total of 20g of products

________ are the starting substances in a chemical equation.

• Reactants

• Producer

• Reaction

• Products

A chemical reaction is balanced when

• both sides have the same elements
• Both sides have the same  number of atoms
• Same subscripts
• Same coefficients

In a synthesis reaction

• A compound breaks apart into two or more compounds
• Two or more compounds make one single product
• CO₂ and H₂O must be products
• O₂ must be a reactant

In a reaction A + B ----> C,  reactant A has 5g and product  C has 9g. How many grams does reactant B should have? 

• 4g
• 5g
• 9g
• 14g

O_{3 --->} O + O2

• Synthesis
• Single Replacement
• Decomposition 
• Combustion

Which are the reactants in the following reaction?
2Mg + O₂ ---> 2MgO 

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

A student in a chemistry class mixes together two clear chemicals and observes bubbling and the beaker getting warmer. Which of the following would not provide the student with evidence that a chemical reaction has occurred?

• Gas Evolution

• Change in Energy

• A clear solution forming

• A new substance