Matter
What is an example of a heterogeneous soup flavor?
Two different states of matter!
ex: chicken noodle, minestrone, egg drop, etc.
How many valence electrons does Silicon have?
4
What do the roman numerals next to the metallic element mean?
ex: Iron (III) Oxide
The charge!
ex: Iron (III) = Fe+3
What type of reaction is this?
2 MgO -> 2 Mg + O2
Decomposition
How many protons are in an atom of Bromine with a charge of -1?
35 protons
What is an example of a homogeneous ice cream flavor?
No chunks!
ex: chocolate, vanilla, strawberry, etc.
How many electrons does an atom of Chlorine with a -1 charge have?
18
Is this bond ionic or covalent?
NaCl
Ionic; metal + non-metal
What type of reaction is this?
Pb + FeSO4 -> PbSO4 + Fe
Single Replacement
What is a half-life?
the time it takes for half of a radioactive sample to decay
What is the definition of an alloy?
Two metallic elements combined
If I have an atom of Bromine (35) with a mass of 80 amu, how many neutrons do I have?
45
In an O2 molecule, how many bonds are present?
2, double bond
If I have less energy & heat than what I started with (- delta H), what type of reaction occured?
Exothermic, heat is released!
If something is a 9.8 on the pH scale, is it an acid or a base?
Base
Is a broken pencil a physical or chemical change?
Physical, it is still the same object!
How many grams are in 2 moles of Oxygen (16 g/mol)?
16 * 2 = 32 g
What is the name of this fomula: Al2O3
Aluminum (tri)oxide
Finish balancing the equation below:
2 C2H6 + ___ O2 -> 6 H2O + 4 CO2 + Energy
7 O2
Find the percent composition of sodium in NaCl.
Na- 22.99 g
Cl- 35.45 g
22.99 + 35.45 = 58.44
22.99/58.44 = 0.393 = 39%
Find the density of an object with a mass of 50g and a volume of 2L.
25 g/L
Find the molar mass of Sodium Chloride (NaCl).
Na- 22.99 g
Cl- 35.45 g
22.99+35.45 = 58.44 g
What single element can bond with 2 sodium atoms?
2Na = +2 charge
pairs with anything that has a -2 charge! ex: O, S, Se, Te
Predict the products in a synthesis reaction. Watch your charges!
1 Mg + 2 Cl -> 1 _____
MgCl2
1L of water is added to 2L of 6M sodium bicarbonate, what is the new concentration?
M1 * V1 = M2 * V2
12/3 = 4M