Chapter 1
Define chemistry.
what is study of substances and the changes they undergo
Define compound.
2 or more elements hooked together to form something new
Define atom.
A single piece of an element
Define electron shell.
A 3-D area around the nucleus which contains electrons of equal energy
Define ionic compound.
One or more electrons is transferred from its metal to the nonmetal causing opposite charges
Volume can be found by using... ?
Water displacement
Difference between chemical and physical change.
Physical change alters the appearance of a substance, unlike a chemical change that creates a new substance.
What does amu represent?
Valence electrons are located in the outermost, highest energy shell, interacting with other atoms. While core electrons are not in the outermost of the shell and do not react with other atoms.
Structural formula.
They are not matter because they do not contain mass or volume.
What do (s), (g), (l) in a chemical formula indicate?
The object's state of matter
Another student claims Sulfur has a different number of protons and electrons, is this true?
No because all atoms are neutral and contain the same number of protons as neutrons.
What element do other atoms want to "look like?"
Noble gases
What are molecular covalent bonds made of?
Nonmetal atoms
mass/volume
What is the one element that is located away from the other non-metals in the periodic table?
The most advanced visual of the atomic model.
The proton model
When a metal and nonmetal bond, the compound's charge must be zero.
Each line is a covalent bond
Do two objects with the same mass have the same volume?
No they do not, because because the stuff that the object is made up of it different.
Yes because matter cannot be created or destroyed.
To calculate weighted average you need to... ?
How many valence electrons need to be gained, lost, or shared while bonding to look like a Noble Gas?
8 valence electrons
How many lone pairs does NH3 contain?
1 lone pair