Matter & Physical/Chemical Changes
What is Matter
Anything that has mass and takes up space
What is the charge of a proton?
Positive
What is a positively charged ion called?
Cation
What happens to electrons in a covalent bond?
Give an EXAMPLE of a chemical change
Answers may vary
What are the 4 states of matter?
Solid, Liquid, Gas, and Plasma
Where are neutrons located?
In the nucleus
How many electrons does the following element have.
Protons: 12
Neutrons: 6
Mass: 18
Atomic Number 12
Charge: -2
14 electrons
What type of elements form an ionic bond
metal and a nonmetal
Which state of matter has the most energy?
Plasma
List 2 Chemical and 2 Physical PROPERTIES.
Physical: Mass, volume, color, density, melting point, freezing point, malleability, ductility, conductivity
Chemical: Flammability, chemical stability, radioactivity, oxidation
The atomic number is = to what?
How many protons are in the atom.
What is the charge of the following element?
Protons: 12
Neutrons: 10
Electrons: 10
Mass: 22
Atomic Number 12
+ 2
Why do elements form bonds?
To become more stable / complete their octet
Give 2 characteristics of nonmetals.
Dull
Brittle
Bad conductors of heat and electricity
Good insulators
What are 3 INDICATIONS that a physical change may have taken place?
change in size, change in shape, change in physical state/state of matter
List 3 characteristics of metals.
Solids at room temperature
Shiny
Malleable (can be stretched or shaped)
Ductile (can be drawn into a wire)
Good conductors of heat and electricity
What is an isotope?
Atoms of the same element with different numbers of neutrons
Balance the ionic bond between Mg and N
Mg3N2
What are valence electrons?
Electrons that are on the outermost energy level
What are 3 INDICATIONS that a physical reaction may have taken place?
Change in color, change in smell, change in temp, formation of gas, emission of light, formation of a solid.
What is special about noble gases?
They have a full outer shell/ octet so they are very unreactive
What is the average atomic mass for the following element?
Mass A = 25 Abundance A = 17%
Mass B = 28 Abundance B = 30%
Mass C = 29 Abundance C = 53%
28.02
Balance the ionic bond between Rb and Se
Rb2Se
What is a particle formed by a covalent bond called?
Molecule