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Answer: The thermite reaction between aluminium and iron oxide produces molten iron used in welding.
Answer: Sodium nitrite (NaNO2) is used as a preservative in cured meats to prevent bacterial growth.
Answer: Newton is the SI unit of force, defined as kg m/s2.
Answer: Friction always opposes the relative motion between surfaces.
Answer: Circular motion requires centripetal acceleration toward the center.
Answer: From 2H2 + O2 to 2H2O, 4 moles of H2 produce 4 moles of H2O since the ratio is 1:1.
Answer: Dry ice (solid CO2) sublimes at low temperature and is used as a refrigerant.
Answer: Dimethyl ether (CH3OCH3) has an oxygen atom bonded to two alkyl groups, characterizing an ether.
Answer: Copper reduces concentrated H2SO4, producing SO2 gas along with CuSO4 and water.
Answer: Force has both magnitude and direction, making it a vector.
Answer: Escape velocity from Earth is approximately 11.2 km/s.
Answer: Be has a filled 2s orbital, making it more stable and harder to ionize than adjacent elements.
Answer: In peroxides such as H2O2, oxygen has an oxidation state of -1 instead of the usual -2.
Answer: Momentum p = mv = 5 x 3 = 15 kg m/s.
Answer: Electronegativity decreases down a group, so F > Cl > Br > I.
Answer: Standard acceleration due to gravity is 9.81 m/s2.
Answer: Work W = F x d = 10 x 5 = 50 J.
Answer: Iodoform (CHI3) has mild antiseptic properties and is used on wounds and burns.
Answer: Newton\'s Second Law states force equals mass times acceleration.
Answer: Kinetic energy equals one-half times mass times velocity squared.