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Chemistry

QuestionAnswer
How many significant figures are in: 10.200 5
How many significant figuries are in: 0.090 2
Write 398,000,000 in scientific notation. 3.98 X 10^8
Melting Endothermic
Freezing Exothermic
State the law of conservation of energy. Energy cannot be created or destroyed, only transferred or transformed.
How many moles are in 13 g of H₂O? 0.72 mol
What is the molar mass of (NH₄)₂SO₄? 132.16 g/mol
7. How many particles are in 3.4 moles of H₂O? 24
8. What is the relationship between temperature and kinetic energy? They are directly proportional
9. What do thermometers measure? Average kinetic energy of particles.
10. Which state of matter has: least collisions solid
Which state of matter has most collisions gas
5 components of Molecular Theory Gases are composed of tiny particles far apart,Particles move in constant random motion,Collisions are elastic,No attractive or repulsive forces between particles,Average kinetic energy depends on temperature
Pressure vs Volume Boyle’s Law
Volume vs Temperature Charles’s Law
Pressure vs Temperature Gay-Lussac’s Law
Volume vs Moles Avogadro’s Law
14. Convert 120 K to °C: -153
15. Volume change with temperature: 25.5 L
Endothermic Products higher than reactants
Exothermic Products lower than reactants
Slanted lines Kinetic energy increases
Flat lines Potential energy increases
Freezing 0
Boiling 100
25. What is half-life? Time required for half of a radioactive sample to decay.
Democritus Matter made of atoms
Thomson Discovered electrons (plum pudding)
Rutherford Nucleus (gold foil experiment)
Bohr Energy levels
Schrödinger Electron cloud model
Ionization energy Energy to remove an electron
Electronegativity Ability to attract electrons
Atomic radius Size of an atom
Down a group Increases atomic radius
Across a period Decreases atomic radius
36. Electronegativity down a group: Decreases
37. Ionization energy across a period: Increases
38. Periodic families: Alkali metals, alkaline earth metals, transition metals, halogens, noble gases, etc.
Created by: user-2012260
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