General
What is the chemical symbol for water?
H2O
Boiling point of water
What element is the lightest
Hydrogen
What is the molar mass of O2?
16.00 g/mol
As you move to the right across a row of the IE periodic table, the # of protons ____.
Increase
3 types of Intermolecular Forces
Dipole-dipole, hydrogen bonds, LDFs
Is ice more dense than water?
No 😹
How many valence electrons does Hydrogen want
2
Write 0.0045 in sig figs
Is there a maximum number of electrons that can fit in the 1st level?
Where is the Atomic Number on your periodic table?
Above the chemical symbol.
What is zero Kelvin in ˚C
−273 °C
What are the units of enthalpy?
A. Joules (J) or kilojoules (kJ)
B. Grams (g)
C. Meters per second (m/s)
A. Joules or kilojoules
How many grams of sodium are in 0.5 moles of sodium? (Na = 23 g/mol)
11.5 grams
(0.5 mol × 23 g/mol = 11.5 g)
Explain why Valence electrons require less force to remove than Shielding electrons
Because they are further from the nucleus
Balance the following equation:
CH₄ + O₂ → CO₂ + H₂O
Answer: CH₄ + 2O₂ → CO₂ + 2H₂O
Is the combustion of wood an endothermic or exothermic reaction
Exothermic
What is enthalpy?
A. Heat content of a system
B. Speed of a reaction
C. Mass of a substance
A. Heat content of a system
If you have 2 moles of CO₂, how many moles of O2 atoms are present?
4 moles
(2 mol CO₂ × 2 O atoms/mole = 4 moles of O atoms).
The 2 factors affecting the magnitude of electrostatic force are ___ and ____
ENC and distance
Who is Regina's HChem teacher
Define all three for the points: Proton, Neutron, and Electron.
Proton: Positively charged subatomic particle found within the nucleus.
Neutron: Subatomic particle with no charge that is found within the nucleus.
Electron: Negatively charged particle with no charge that is found outside the nucleus.
Draw the Lewis dot structure for water (H₂O). How many lone pairs does oxygen have?
Oxygen in H₂O has 2 lone pairs.
If you have 5 moles of CH₄ and it burns completely in O₂, how many moles of CO₂ are produced?
CH₄ + 2 O₂ → CO₂ + 2 H₂O
5 moles of CO₂ are produced
(5 moles CH₄ × (1 mole CO₂ / 1 mole CH₄) = 5 moles CO₂.)
(DOUBLE POINTS) Explain Coulomb's Law
Coulomb’s Law is about how electric charges push or pull each other
- The bigger the charges on the objects, the stronger the push or pull between them.
- The farther apart the objects are, the weaker the force gets
- Two positive or two negative charges push each other away, but a positive and a negative pull toward each other.