A) Nitrogen and oxygen B) Oxygen and hydrogen C) Sulphur and oxygen D) Carbon and oxygen
A) X2Y B) X3Y2 C) X2Y3 D) XY2
A) 8 and 2 B) 2 and 3 C) 1 and 3 D) 6 and 2
A) Evaporation B) Melting C) Crystallisation D) Sublimation
A) H2O B) CO2 C) NH3 D) NaCl
A) Water B) Sodium chloride C) Iron D) Carbon dioxide
A) Ethanol (C2H5OH) B) Carbon dioxide (CO2) C) Methane (CH4) D) Ammonia (NH3)
A) Are closely packed together B) Have strong intermolecular forces of attraction C) Have fixed positions in a lattice structure D) Have negligible volume compared to the space they occupy
A) Have particles that are closely packed together and vibrate in fixed positions B) Have particles that are highly compressed and far apart C) Have particles that are far apart and moving randomly D) Have particles that are highly compressed and free to move
A) Burning of wood B) Melting of ice C) Rusting of iron D) Digestion of food
A) Boyle's law and Charles's law B) Boyle's law and Avogadro's law C) Boyle's law, Charles's law, and Avogadro's law D) Charles's law and Avogadro's law
A) PV = RT B) PV = nT C) P = V/nRT D) PV = nRT
A) Volume B) Number of moles C) Atomic mass D) Density
A) Helium B) Chlorine C) Sodium D) Oxygen
A) They have specific shapes. B) They attract each other strongly C) They occupy a significant volume. D) They are constantly in motion.
A) wood and oxygen is equal to the mass of the carbon dioxide and water vapor. B) wood and oxygen is greater than the mass of the products. C) wood decreases, while the mass of the products remains constant. D) wood and oxygen is less than the mass of the products.
A) Carbon dioxide (CO₂) has a constant ratio of carbon to oxygen, regardless of its origin. B) Water (H₂O) always contains hydrogen and oxygen in a 2:1 ratio by mass. C) All samples of table salt (NaCl) have the same ratio of sodium to chlorine. D) The color of a compound can vary depending on its source.
A) 1:3/2 B) 2:3 C) 1:2 D) Cannot be determined without additional information.
A) Hydrogen and oxygen react explosively to form water. B) Water can decompose into hydrogen and oxygen under specific conditions. C) Two molecules of hydrogen react with one molecule of oxygen to form two molecules of water. D) 2 grams of hydrogen react with 1 gram of oxygen to produce water.
A) 5 moles B) 10 moles C) 2.5 moles D) Cannot be determined without additional information. |