HESI A2 Chemistry 2024
Scientific Notation Rules - ANS If the number is positive the decimal moves to the RIGHT.
If the number is negative the decimal moves to the LEFT
Metric System Prefixes - ANS King Henry Died Drinking Chocolate Milk
(=) Kilo, Hecto, Deka, Deci, Centi, Mili, (-)
Micro prefix means - ANS 10 to the -6
What is the metric unit for mass? - ANS gram
What is the metric unit for volume? - ANS liter (L)
What is the metric unit for distance? - ANS meter
What are the 3 common temperature systems? - ANS Fahrenheit, Celsius, Kelvin
Fahrenheit - ANS The temperature scale on which water freezes at 32 degrees and boils at 212
degrees. Sea water freezes at 0 degrees. Most people have a body temp of 98.6. Used by
United States
Celcius - ANS Metric temperature scale on which water freezes at 0 degrees and boils at 100
degrees. Normal Body temp is 37 degrees.
Kelvin - ANS SI unit for temperature
-0k =-273.15 Celsius
-freezing is 273k
-boiling is 373k
-body temp is 310k
Describe atomic Structure - ANS An atom has a central nucleus made up of protons and
neutrons and has orbitals surrounding it which have a high probability of containing an electron
(except Hydrogen which has one proton and no neutrons in its nucleus)
Ion - ANS electrically charged atom
Cation - ANS A positively charged ion (has lost electrons)
, Anion - ANS A negatively charged ion (gained electrons)
What are the charges for group 1A-3A? - ANS 1A- +1
2A- +2
3A- +3
What is the charge for group 4A? - ANS either +/- 4
What are the charges for groups 5A-8A? - ANS 5A- -3
6A- -2
7A- -1
8A-0
Atomic Number - ANS the number of protons in the nucleus of an atom
Atomic Weight - ANS Average of the mass numbers of all isotopes (located in the periodic
table)
Isotope - ANS An atom with the same number of protons and a different number of neutrons
therefore a different weight
Atomic Mass - ANS Number of protons and neutrons
Equilibrium - ANS reactants form products at the same rate products are forming reactants.
Reactions at equilibrium are reversible.
What are the 4 ways to increase reaction rates? - ANS 1. increase temperature
2. increase surface area of reactants
3. increase concentration of reactants
4. catalyst
Solution - ANS A homogeneous mixture of two or more substances
Compounds - ANS Mixtures of different elements to create a single matter
Alloys - ANS mixtures of two or more metals
Amalgams - ANS a specific type of alloy in which another metal is dissolved in mercury
Emulsions - ANS mixtures of matter that readily separate such as water and oil
Percent Concentrations - ANS express the amount of solute in 100 units of solution
Avogadro's Number - ANS 6.02 x 10^23
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