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