Unit 4 Chemical Formulas

Question 1

occurs when one or more substances are changed into new substances with different properties; cannot be undone by physical means

Answer 1

chemical reaction

Question 2

Chemical formulas and symbols written to represent a reaction

Answer 2

chemical equation

Question 3

A shorthand notation that uses chemical symbols and numbers as subscripts to represent the type and number of atoms that are present in the smallest unit of the substance.

Answer 3

chemical formula

Question 4

a one or two letter notation used to represent an atom of a particular element; sometimes referred to as an atomic symbol

Answer 4

chemical symbol

Question 5

a number placed in front of a chemical symbol or formula in order to balance the equation

Answer 5

coefficient

Question 6

a reaction that gets cold because heat energy is absorbed from the surrounding area

Answer 6

endothermic

Question 7

a reaction that gets hot as heat energy is released to the surrounding area

Answer 7

exothermic

Question 8

the mass of all the reactants must equal the mass of all the products; matter is neither created nor destroyed

Answer 8

law of conservation of mass

Question 9

occurs when one or more physical properties of a substance are changed; many can be undone by physical means

Answer 9

physical change

Question 10

a solid that falls out of a liquid solution during a chemical reaction

Answer 10

precipitate

Question 11

a substance produced during a chemical reaction

Answer 11

product

Question 12

a substance that takes part in and undergoes change during a reaction

Answer 12

reactant

Question 13

a number written below and to the right of a chemical symbol that shows the number of a specific type of atom present in a molecule

Answer 13

subscript

Question 14

to produce

Answer 14

yield