Chemistry and Materials Science Flashcards
6 cards from real EIT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Chemistry and Materials Science flashcards as text
Galvanic corrosion occurs when two dissimilar metals are:
Answer: Electrically connected in the presence of an electrolyte
Galvanic corrosion is an electrochemical process where the more active (anodic) metal corrodes preferentially when coupled to a nobler metal in electrolyte.
The modulus of elasticity (Young's modulus) E relates stress σ to strain ε in the elastic range by:
Answer: σ = Eε
Hooke's Law for uniaxial stress: σ = Eε, where E is the slope of the linear elastic portion of the stress-strain curve.
Annealing of metals is a heat treatment process used to:
Answer: Relieve internal stresses and increase ductility
Annealing involves slow heating and cooling to reduce residual stresses, soften the material, and restore ductility.
The stoichiometry of the combustion of methane (CH₄) with oxygen is:
Answer: CH₄ + 2O₂ → CO₂ + 2H₂O
Balanced complete combustion: CH₄ + 2O₂ → CO₂ + 2H₂O; one molecule of methane requires two molecules of oxygen.
A material with high hardness but low toughness is described as:
Answer: Brittle
Brittle materials resist surface scratching (high hardness) but fracture suddenly without plastic deformation (low toughness).
In electrochemistry, oxidation occurs at the:
Answer: Anode
Oxidation (loss of electrons) occurs at the anode; reduction (gain of electrons) occurs at the cathode — remember 'Red Cat, An Ox'.