Chapter 1
What is physical change?
When something changes appearance but not composition of matter
What is the Law of Conservation of Matter?
Matter cannot be created or destroyed
What is atomic mass?
The average mass of one atom of that elements in atomic mass units
Where are valence electrons found?
outside the shell of the atom
What does the H in the HONC1234 rule stand for?
Hydrogen
True or false: Never taste or touch chemicals
True
Where are alkali metals?
Group 1A
What is atomic number?
Number of protons
What is an anion?
Negative ion
How many bonds does nitrogen need to complete the HONC1234 rule?
3 Bonds
What is a Compound?
More than 1 element together to form something new
Where are noble gases?
Group 8A
Add protons and neutrons
What is a cation?
Positive ion
What does double bond mean?
2 atoms share 2 pairs of electrons
Where are protons and what are there charges?
Protons are in the nucleus with a +1 charge
How did Dmitri sort his table of elements?
By atomic mass
What is a nuclear reaction?
Changes in the nucleus
What was the purpose of the flame tests?
To identify metal atoms in a variety of compounds and to provide evidence for the presence of certain atoms within compounds
When drawing a structural formula what atoms do you draw first?
Carbon
How do you find volume?
Length x Width x Height
What did Dmitri Mendelegue do?
Created a table of all the 63 then known elements
True or false: Elements have the same number of protons and neutrons
False
True or False: When ions form electrons are gained or lost to "look like" a noble gas?
true
What is a bad smell called?
Putrid