Chemical Reactions Formative

A change in which one or more substances are converted into new substances is a _______.

• physical change
• chemical reaction
• nuclear reaction
• chemical fusion

New substances produced by a chemical reaction are _______.

• resultants
• reactants
• coefficients
• products

The law of conservation of mass states that _______.

• matter can be created and destroyed but does not change forms
• in a chemical reaction, efforts should be made to preserve rare elements without changing them
• in a chemical reaction, matter is not created or destroyed, but is conserved
• in a chemical reaction, the final mass of the products is always greater than the starting mass of the reactants

10 g of mercury(II) oxide react to produce 9.3 g of mercury and oxygen.  What is the mass of the oxygen produced?  (Think conservation of mass)

• 0.7 g
• 19.3 g
• 7.0 g
• 1.7 g

Tags

NGSS.HS-PS1-7

_______ is a way to describe a chemical reaction using chemical formulas and symbols.

• A chemical equation
• Synthesis
• A physical law
• The law of conservation of matter

In a _______ reaction, two or more substances combine to form one new substance.

• synthesis
• decomposition
• single replacement
• double replacement

The formula AB → A+B represents what type of chemical reaction?

• synthesis
• decomposition
• single displacement
• double replacement

Which of the following general formulas represents a single-displacement reaction?

• AB → A + B   
• A + B → AB
• A + BC → AC + B
• AB + CD → AD + CB

An insoluble compound that comes out of solution during a double displacement reaction is called a   _______.

• solvent
• reactant
• precipitate
• catalyst

What type of reaction is represented by the following equation: 2H₂ + O₂ → 2H₂O?

• synthesis
• single replacement
• double replacement
• decomposition