(Chem) W16b Unit 5 Reactions Exam

What are 2 or more elements that are chemically combined?

• molecule
• atom
• bond
• cation

In a molecule, we know we have a new element each time we have a new _____ letter.

• capital
• lowercase
• bold face
• underlined

What is a number placed after an element and below the line that tells us how many atoms of that element are in the molecule?

• subscript
• molecule
• coefficient
• exponent

A subscript ___ affects the the element just before it.

• only
• never
• seldom
• sometimes

What is a number placed before a molecule that tells us how many of those molecules we have in the formula. This large number is placed in front or to the left of the element or molecule?

• coefficient
• subscript
• molecule
• exponent

The coefficient _____ on each subscript in the molecule.

• multiplies
• divides
• works
• focuses

____ are found on the left side of a chemical equation and they represent the chemicals we have before the reaction begins.

• Reactants
• Products
• Metalloids
• Metals

____ are found on the right side of an equation and they represent the chemicals remaining when the reaction is complete.

• Products
• Reactants
• Metalloids
• Metals

The ____ divides the equation and we say the word produces or yields when we read the reaction.

• arrow
• plus sign
• minus sign
• equals sign

Identify this reaction: When 2 or more elements or compounds combine to form a single product.

• Synthesis
• Decomposition
• Combustion
• Single Replacement