Science 6 Review - Atoms & Molecules

forms hydrogen ions when dissolved in water

bitter taste

19

reaction in which a compound is broken down into simpler compounds

baking soda, soap, bleach

Atomic Number

substance that contains only one kinds of atom

21

molecule formed from two or more different elements

developed the periodic table of elements

sour taste

part of the atom with a positive charge

helps digest food in the stomach

center part of an atom (21)

chemical symbol

tiniest recognizable part of an element

bases that dissolve in water

atomic number = number of 

positively and negatively charged ions attract each other to form

changes colors of an indicator

chalk

strong acids that eat away metals

The number of atoms of oxygen in H₂CO₃

bond that forms crystals

forms hydroxide ions when dissolved in water

identifies the number of electrons in the outer shell

process of joining different types of atoms to form a different substance

horizontal rows on the periodic table

vertical columns on the periodic table

abbreviations for the names of elements

antacid tablets

usually composed of a metal and a nonmetal

The number of atoms of carbon in H₂CO₃

atoms that have lost or gained electrons

20

the study of matter -- what it's made of, it's characteristics, how it reacts to other matter

The number of atoms of hydrogen in H₂CO₃

formed when an acid and a base neutralize each other

Atomic Mass

can burn; can be corrosive

18

identifies the number of shells in the atom

symbols and numbers used to shorten the name of a compound

purpose of the periodic table of elements

reaction in which molecules combine to form a new substance

changes color when exposed to acid or base solutions

slippery to touch

Atoms share electrons

used to determine the concentration of acids or bases in a solution

lemons, vinegar, tomato juice

part of the atom with a negative charge

reaction in which one element replaces another

number of protons + number of neutrons

part of the atom with no charge

element name

developed a simplified model of an atom based on the idea that electrons move in shells

reaction in which two elements switch places