ESAT Chemistry Flashcards

6 cards from real ESAT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 ESAT Chemistry flashcards as text

What is the molar mass of water (H₂O)?
Answer: 18 g/mol
H₂O: 2(1) + 16 = 18 g/mol, using standard atomic masses.
In ESAT Chemistry, what does a higher activation energy indicate?
Answer: Slower reaction rate
Higher activation energy means fewer molecules have sufficient energy to react, resulting in a slower rate.
What type of bonding involves the sharing of electron pairs between atoms?
Answer: Covalent bonding
Covalent bonds are formed by the sharing of one or more electron pairs between atoms.
Which of the following is an example of an oxidation reaction?
Answer: Mg → Mg²⁺ + 2e⁻
Oxidation is loss of electrons (OIL RIG); Mg losing 2 electrons to form Mg²⁺ is oxidation.
What is the pH of a solution with [H⁺] = 1 × 10⁻³ mol/L?
Answer: 3
pH = -log[H⁺] = -log(10⁻³) = 3.
How many moles of NaCl are in 117 g? (Molar mass NaCl = 58.5 g/mol)
Answer: 2 mol
n = mass / molar mass = 117 / 58.5 = 2 mol.