Vocab terms
Represented by a capital letter or capital and lowercase letter
Element
original substance at the beginning of a chemical reaction?
Reactant
mass is neither ___ nor _____ in a chemical reaction
created nor destroyed
any property that can be observed using the five senses or can be measured without changing the matter?
Physical property
how many things are in a given area (how compact it is)?
density
When two or more substances combine to form something new
chemical reaction
the new substance produced in a chemical reaction?
Product
Mass must remain the _______?
SAME
Property that changes by means of a chemical reaction?
Chemical property
What happens when something is MORE dense?
sinks (falls)
the smallest particle of an element that still has the same chemical properties of the element?
Atom
Large number in front of the elements?
Coefficient
When matter cannot enter or leave the system
closed system
Is rust on a nail a chemical or physical change?
Chemical
What happens when something is LESS dense?
rises (goes up)
particle of matter that is made of two or more atoms that are joined together?
Molecule
Shows how many atoms in a formula, little number written behind the element?
Subscript
How many total atoms are in H2O?
3
Give an example of a physical change
......
Give an example of an item that is more dense vs less dense
...
Give 2 examples that a chemical reaction has occured
color change, bubbles forming, odor change, temp change, produces fire/ light
How do you find the total number of atoms in a chemical equation?
multiplying the coefficient by the subscript
How many atoms are listed below?
3H3P2
15
Give an example of a chemical change?
....
What is the formula to find density?
density = mass / volume