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Science Final Xams 1
Question | Answer |
---|---|
if you dropped a piece of wood and a piece of gold into water and the wood floats and the gold sinks, what can you infer? | *The density of gold is more than the density of water *The density of wood is less than the density of the gold. |
What is a compound? | 2 or more substances CHEMICALLY combined. |
Why must you study 2 or more characteristics before identifying an unknown substance? | Some substance have the 2 or more of the same characteristic properties. |
What are characteristic properties of matter? | *Boiling Point *Density *Melting Point *A property that never changes |
What is a molecule? | The smallest unit of MOST compounds. |
Atoms of 2 or more elements can combine to form..... | Compounds |
The elements in each group are ALIKE or NOT ALIKE in properties? | Not alike |
All elements in the same group have similar.... | Characteristics |
A column on the periodic table can also be called... | Group or Family |
How can an elements properties be predicted? | It's location on the periodic table |
The atomic number for the element calcium is 20. How many protons does 1 atom of calcium have? | 20 |
What is the rule for finding the protons of an atom? | Protons = Atomic # |
How do you find the neutrons of an atom? | Atomic Mass - Atomic # |
What are 3 things that are true about Chemical Reactions? | *Absorb or release energy *Produces new substances. In some CRs 2 or more substances combine, forming one or more new substance |
What is the law of conservation of energy? | The principle that says in every physical and chemical change the total amount of energy stays the same. |
The volume of a gas is the same as the volume of its... | Container |
Chemists classify an element as a metal based on which properties? | Hardness Shininess Malledoility Ductility |