One of a class of substances that cannot be separated into simpler substances by chemical means.
What is an element?
100
A physical property is an aspect of matter that can be observed or measured without changing it.
A chemical property may only be observed by changing the chemical identity of a substance.
What is the difference between chemical and physical properties?
100
Density is mass divided by volume.
What is density?
100
Placement on the periodic table and how many protons are in the nucleus
What does atomic number mean?
100
periods go from left to right
Which way do periods go?
200
Composed of two or more parts, elements, or ingredients.
Ex: soap
What is a compound?
200
color, smell, freezing point, boiling point, melting point, infra-red spectrum, attraction or repulsion to magnets, opacity, viscosity and density.
What are physical properties?
200
M=mass, D=density, V=volume. M=DV V=M/D D=M/V
What is the equation for density?
200
finding the number of neutrons in an elements nucleus
What does atomic mass help us with?
200
rows go up and down
Which way do rows go?
300
Two or more substances that are not chemically united and that exist in no fixed proportion to each other.
What is a mixture?
300
heat of combustion, reactivity with water, PH, and electromotive force.
What are some chemical changes?
300
By multiplying volume and and density.
Knowing an objects density, how would you find their mass?
300
Neutrons= No Charge
Electrons= (-) Charge
Protons-(+) Charge
What are the charges of neutrons, electrons, and protons?
300
periods represent the number of outer rings there are
What is represented by periods
400
A compound is a substance in which atoms of different elements are chemically held to one another. A mixture is a substance made by combining two or more different materials in such a way that no chemical reaction occurs. A mixture can usually be separated back into its original components, a compound can not.
What is the difference between a compound and a mixture?
400
color
What is physical property?
400
density= 2
What is the density of something with a mass of 6 grams and a volume of 3 g/cm^3
400
protons and neutrons
What is in the nucleus
400
how many valence electrons a element has
What is represented by rows?
500
Compound
Is salt a compound or mixture?
500
boiling point, melting point, ect
What is chemical property?
500
Differences in density allow some objects to float on other objects.
Why is density important?
500
1
how many protons does hydrogen have?
500
the arrangement of all of the known elements in one place.