chem or physical
The charge of an electron
What is negative
The number of neutrons does helium
What is two?
R - type of reaction where AB + C ----> AC + B
What is a single replacement
a large brick and a small brick both made of the same substance and both at room temperature, which one has the highest thermal energy?
Larger brick
Place sodium electrons on the correct energy levels
level 1: 2
Level 2:8
Level 3: 1
DAILY DOUBLE:
reaction that produces heat
What is exothermic
3 indications a chemical reaction has occurred
-Gas production
-Cannot be reversed easily
-Color changes
-Order
-Formation of a solid
Sugar dissolves in water
What is a Physical Change?
Place Argon electrons on the correct energy levels
level 1: 2
Level 2:8
Level 3:8
reaction that absorbs or uses heat
What is endothermic
Count the number of each element in the chemical formula
6FeCl2
Fe:6
Cl:12
A change in state of matter
what is a physical
DAILY DOUBLE:
what the arrow means in a chemicals reaction
________are formed by gain or loss of an electron from an atom or molecule
what are ions
HCL + NaOH -----> NaCL + HOH is what type of reaction
What is double replacement
Count the number of each element in the chemical formula
Be(NO3)2
Be:1
N:1
O:6