Identifying Substances
A bar of solid gold is what type of mixture?
Pure substance / element
If a new substance is produced, it is what type of change?
Chemical
Group 18 is known as what family?
Noble gasses
Atoms are made of Neutrons, Electrons and ___________
Protons
What is formed when two atoms combine and bond with each other?
Molecule
A jar of Carbon dioxide with nothing else in contains what type of substance?
Pure substance / compound
Oxygen's ability to react with fire is what type of property?
Chemical
How does the reactivity of nonmetals change as I move DOWN the periodic table (from Period 1 - 6)
Reactivity INCREASES
What is the formula for calculating the number of neutrons in an element?
Neutrons = Atomic Mass - Protons
What is an electron's charge?
Negative
How can you tell when something is a mechanical mixture?
You can see the different parts
This is a substance's ability to be pulled into a wire
Ductility
Which subatomic particle determines the atomic number?
Protons
How many electrons can be fit onto an elements 2nd orbital (energy level)?
8
This is the term for a positively charged ion
Cation
What is an alloy made of?
Two different metals in a solution
Melting point is what type of property
Characteristic physical property
How many valence electrons do each of the alkali metals have?
When the number of electrons does NOT match the number of protons in an element, we call it this
Ion
Covalent / molecular bond
Mechanical mixture is to heterogenous as solution is to _______
homogenous
Two chemicals mix together and react. What do you call the solid white chunks that are formed?
Precipitate
What family does hydrogen belong to?
Hydrogen
How can I tell if an element is an isotope?
Count the neutrons / compare atomic masses
This is the term we use to describe elements that naturally combine with each other to make a gas (e.g., O2, H2, F2...)
Diatomic