physical properties and chemical properties
What does physical property mean?
color, shape size, anything that does not change what something is made up of.
What are the three states of matter?
Solid liquid and gas
What are the two bigger parts of the atom
The Nucleus and the Electron Cloud
Is water an element?
No
The periodic table is organized by what number?
The atomic number
What is a chemical change?
When two chemicals combine to make a new substance. or when a reaction causes a chemical to change.
when ice becomes liquid is has hit it _____ point
Melting point
What is the Nucleus made up of?
Protons and nutrons
When we combine different elements to make new substances that is called a what
Compound
what does the atomic number tell us?
How many protons and electrons there are
What is combustibility and is it a chemical reaction or a physical change?
The ability to burn is a chemical reaction
When water gets to its boiling point, we can see liquid water become what?
gas
what type of charge does a proton have?
Positive
about how many different elements are there?
118
How do you find the number of nutrons?
Atomic mass - the atomic number
What is reactivity
The ability for a substance to combine chemically with another substance to make something new.
What is matter
Anything that takes up space and has a mass
What do atoms make up? Can you break atoms down into smaller things?
All matter- no you can not break atoms
Is the oxygen we breath an element?
yes
Can a chemical symbol be shared between different elements
no- that would be confusing
can a chemical change be undone?
no- like baking a cake
describe what atoms look like when they are in a solid, liquid and gas
solids have a definite shape and volume, liquids have a definite volume and indefinite shape, gas has an indefinite volume and shape.
do the atoms of all elements look the same?
no
what are the three main categories of elements?
Metal, nonmetal and metalloid
true or false- The chemical symbol always starts with a capital letter.
True