Basic Concepts
what is the atomic number of oxygen
8
what type of bond is formed between sodium and chlorine
Ionic Bond
Balance the equation: H₂ + O₂ → H₂O
2H₂ + O₂ → 2H₂O
How many molecules are in 2 moles of CO₂?
1.204 × 10²⁴ molecules
(1 mole = 6.022×10²³ molecules → 2 × 6.022×10²³ = 1.204×10²⁴)
What does the symbol "Na" stand for
Sodium
What is the formula for Water
H20
Balance the equation: Na + Cl₂ → NaCl
2Na + Cl₂ → 2NaCl
What is the pH of a neutral solution?
7
Which side of the periodic table are the metals on
left side.
is CO2 ionic or covalent?
Covalent
What type of reaction is this? 2H₂O → 2H₂ + O₂
Decomposition
What gas is produced when hydrochloric acid reacts with zinc?
Hydrogen gas (H₂)
what is a "group" on the periodic table
A vertical column of elements with similar properties or similar response.
What is the name of the compound NaCI
Sodium Chlorine
How many moles are in 18 grams of water (H₂O)?
1 mole
(Molar mass of H₂O = 18 g/mol; 18g ÷ 18g/mol = 1 mole)
If you have 4g of helium, how many moles do you have?
1 mole
Name three subatomic particles in an atom
Protons, Neutrons, Electrons
What is the charge of a fluoride ion
-1
What is the molar mass of Ca(OH)₂?
74 g/mol
(Ca = 40, O = 16×2, H = 1×2 → 40 + 32 + 2 = 74)
A compound has the formula C₆H₁₂O₆. What is its molar mass?
180 g/mol
(C = 12×6 = 72, H = 1×12 = 12, O = 16×6 = 96 → 72 + 12 + 96 = 180)