A) Sulphur and oxygen B) Nitrogen and oxygen C) Carbon and oxygen D) Oxygen and hydrogen
A) CH4 B) C2H4 C) CH3 D) CH2
A) CHO B) CH3O C) CH4O D) CH2O
A) XY2 B) X2Y3 C) X3Y2 D) X2Y
A) 6 and 2 B) 8 and 2 C) 2 and 3 D) 1 and 3
A) Atomic mass B) Molar mass C) Oxidation numbers D) No of moles
A) -5 B) +7 C) +8 D) -7
A) Crystallisation B) Melting C) Evaporation D) Sublimation
A) 20 B) 32 C) 10 D) 22
A) 28.07% B) 14.71% C) 21.33% D) 42.66%
A) 160 B) 328 C) 164 D) 346
A) Potassium B) Sulphur C) Chlorine D) Argon
A) Neutrons between two atoms B) Electrons from one atom to another C) Protons between two atoms D) Electrons between two atoms
A) CO2 B) NH3 C) NaCl D) H2O
A) Sharing of electrons between atoms B) Formation of covalent bonds between atoms C) Transfer of electrons between atoms D) Presence of positive ions in a sea of delocalized electrons
A) Sodium chloride B) Iron C) Carbon dioxide D) Water
A) All of the above B) Electron affinity of atoms C) Atomic radius of atoms D) Electronegativity difference between atoms
A) Oxygen B) Nitrogen C) Helium D) Carbon
A) Methane (CH4) B) Ammonia (NH3) C) Ethanol (C2H5OH) D) Carbon dioxide (CO2)
A) Weak intermolecular forces between molecules B) Strong electrostatic attractions between ions C) Strong covalent bonds between atoms D) Weak intramolecular forces within molecules
A) Methane (CH4) B) Ethanol (C2H5OH) C) Hydrogen peroxide (H2O2) D) Sodium chloride (NaCl)
A) Have fixed positions in a lattice structure B) Have negligible volume compared to the space they occupy C) Have strong intermolecular forces of attraction D) Are closely packed together
A) The density of particles within a gas B) The chemical reactions occurring within a gas C) The motion of particles within a gas D) The arrangement of particles within a gas
A) Have particles that are far apart and moving randomly B) Have particles that are highly compressed and free to move C) Have particles that are highly compressed and far apart D) Have particles that are closely packed together and vibrate in fixed positions
A) Rusting of iron B) Burning of wood C) Melting of ice D) Digestion of food
A) Volume and number of moles of a gas B) Pressure and volume of a gas C) Pressure and temperature of a gas D) Temperature and volume of a gas
A) Pressure and volume of a gas B) Temperature and volume of a gas C) Volume and number of moles of a gas D) Pressure and temperature of a gas
A) Boyle's law and Avogadro's law B) Boyle's law and Charles's law C) Boyle's law, Charles's law, and Avogadro's law D) Charles's law and Avogadro's law
A) PV = nRT B) PV = nT C) P = V/nRT D) PV = RT
A) Temperature B) Square root of its molar mass C) Volume D) Pressure
A) Number of moles B) Atomic mass C) Density D) Volume
A) Particles in one gram of a substance B) Moles in one liter of a gas C) Electrons in one atom of a substance D) Atoms in one mole of a substance
A) HCN B) CO2 C) NH3 D) H2O
A) High similarity in electronegativity B) Both elements are non-metals C) Large difference in electronegativity D) Similar electron affinity values
A) Helium B) Chlorine C) Oxygen D) Sodium
A) They can be polar or non-polar B) They are responsible for the high melting and boiling points of many molecules. C) They form between atoms with similar electronegativity. D) They involve sharing electrons.
A) London dispersion forces B) Covalent bonding C) Hydrogen bonding D) Dipole-dipole interactions
A) They occupy a significant volume. B) They attract each other strongly C) They have specific shapes. D) They are constantly in motion.
A) solids are rigid and have definite shapes B) gases expand to fill their container. C) all three statements are true. D) liquids flow easily and have indefinite shapes.
A) inversely proportional to its temperature B) constant C) dependent on the container size. D) directly proportional to its temperature
A) R B) V C) K D) P
A) wood decreases, while the mass of the products remains constant. B) wood and oxygen is less than the mass of the products. C) wood and oxygen is greater than the mass of the products. D) wood and oxygen is equal to the mass of the carbon dioxide and water vapor.
A) compounds are ignored. B) elements are used directly. C) reactants and products are used to convert between grams and moles. D) are not needed, only the coefficients are important.
A) know the physical properties of all the reactants and products. B) memorize the names of all elements and compounds. C) balance the chemical equation first. D) perform complex mathematical calculations.
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) The color of a compound can vary depending on its source. D) All samples of table salt (NaCl) have the same ratio of sodium to chlorine.
A) 2:3 B) 1:3/2 C) Cannot be determined without additional information. D) 1:2
A) 2 grams of hydrogen react with 1 gram of oxygen to produce water. B) Water can decompose into hydrogen and oxygen under specific conditions. C) Hydrogen and oxygen react explosively to form water. D) Two molecules of hydrogen react with one molecule of oxygen to form two molecules of water.
A) all chemical reactions. B) only elements, not compounds. C) elements that can form more than one compound with another element. D) compounds that can react with each other.
A) the names of the reactants and products B) the states of matter of the reactants and products. C) the order in which the reactants combine. D) the relative amounts of each molecule or atom involved in the reaction.
A) 2.5 moles B) Cannot be determined without additional information. C) 5 moles D) 10 moles |