Introduction to Chemical Reactions

Which is true for a chemical reaction?

• The atoms of the reactants always stay together to form the products

• Some atoms disappear while others multiply to form the products

• New atoms are formed which combine to make the products

• The atoms of the reactants unbond, rearrange, and then rebond to form the products

In a chemical equation, symbols are used express chemical reactions in a shorthand manner. Which pair of symbol and meaning is correct?

• (l), liters

• (g), grams

• (aq), dissolved in water

• (sp), solid product

• (lq), liquid

• product

• reactant

• catalyst

• solid

• "and"

• "reacts with"

• "yields"

• "plus"

• 4

• 3

• 7

• 12

• synthesis

• double replacement

• combustion

• single displacement

The coefficient of each element should be the same on both sides of the equation.

• True

• False

What is the term for a digit in front of a chemical formula that helps to balance a chemical equation?

• coefficient

• subscript

• superscript

• exponent

• Yes

• No

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.