HF has a polar covalent bond due to large electronegativity difference between H (2.1) and F (4.0), causing unequal sharing. It is not ionic because the difference is not extreme enough (>1.7 is typical but borderline). The bond is polar.
Explanation:
Two reactants combine to form a single product, so combination (also called synthesis). No oxidation state change, so not redox. Decomposition is opposite.
Explanation:
Metals are malleable (can be beaten into sheets), ductile (drawn into wires), and good conductors. Brittleness is a characteristic of non-metals and some metalloids; metals can deform without breaking. For example, gold is highly malleable.
Explanation:
Plaster of Paris (CaSO₄·½H₂O) reacts with water to form gypsum (CaSO₄·2H₂O) which sets into a hard solid mass with slight expansion. Reaction: CaSO₄·½H₂O + 1½H₂O → CaSO₄·2H₂O. This property is used for casting and setting broken bones.
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