Question | Answer |
What is the smallest unit of matter? | the atom |
What is a substance that cannot be broken down by ordinary chemical means? | element |
Who coined the term the atom? | Democritus |
What law says, "Mass is neither created nor destroyed during ordinary chemical reactions or physical changes"? | Law of Conservation of Mass |
The transformation of a substance or substances into one or more new substances is known as | chemical reaction |
A chemical compound contains the same elements in exactly the same proportions by mass regardless of the size of the sample or source of the compound according to what law? | Law of Definite Proportions |
It two or more different compounds are composed of the same two elements then the ratio of the masses of the second element combined with a certain mass of the first element is always a ration of small whole numbers is stated by what law? | Law of Multiple Proportions |
Who developed the atomic theory | Dalton |
Are atoms divisible into smaller particles? | yes |
All matter is composed of what? | atoms |
What identifies an element | the proton |
What are the two main parts of an atom? | nucleus and the electron cloud |
What are the subatomic properties of an atom? | proton, neutron, electron |
What charge does a proton have? | positive |
What charge does a neutron have? | neutral |
What charge does an electron have? | negative |
What subatomic particle(s) are found in the nucleus? | proton and neutron |
What subatomic particle(s) are found in the electron cloud? | electrons |
What scientist measured the charge-to-mass ration of an electron? | J.J. Thomson |
Who did the oil drop experiment? | Robert Milikan |