A) Sulphur and oxygen B) Carbon and oxygen C) Nitrogen and oxygen D) Oxygen and hydrogen
A) X2Y3 B) XY2 C) X2Y D) X3Y2
A) 2 and 3 B) 6 and 2 C) 1 and 3 D) 8 and 2
A) -5 B) -7 C) +8 D) +7
A) Melting B) Crystallisation C) Evaporation D) Sublimation
A) Chlorine B) Argon C) Sulphur D) Potassium
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) NaCl C) H2O D) NH3
A) Formation of covalent bonds between atoms B) Presence of positive ions in a sea of delocalized electrons C) Sharing of electrons between atoms D) Transfer of electrons between atoms
A) Water B) Iron C) Sodium chloride D) Carbon dioxide
A) All of the above B) Electron affinity of atoms C) Atomic radius of atoms D) Electronegativity difference between atoms
A) Helium B) Carbon C) Nitrogen D) Oxygen
A) Strong electrostatic attractions between ions B) Weak intramolecular forces within molecules C) Weak intermolecular forces between molecules D) Strong covalent bonds between atoms
A) Methane (CH4) B) Ethanol (C2H5OH) C) Sodium chloride (NaCl) D) Hydrogen peroxide (H2O2)
A) Have negligible volume compared to the space they occupy B) Have strong intermolecular forces of attraction C) Have fixed positions in a lattice structure D) Are closely packed together
A) The density of particles within a gas B) The motion of particles within a gas C) The arrangement of particles within a gas D) The chemical reactions occurring within a gas
A) Burning of wood B) Melting of ice C) Digestion of food D) Rusting of iron
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) PV = nRT B) PV = RT C) PV = nT D) P = V/nRT
A) Pressure B) Square root of its molar mass C) Temperature D) Volume
A) Atomic mass B) Density C) Volume D) Number of moles
A) Particles in one gram of a substance B) Moles in one liter of a gas C) Atoms in one mole of a substance D) Electrons in one atom of a substance
A) H2O B) HCN C) CO2 D) NH3
A) Similar electron affinity values B) Large difference in electronegativity C) High similarity in electronegativity D) Both elements are non-metals
A) Oxygen B) Sodium C) Chlorine D) Helium
A) They can be polar or non-polar B) They involve sharing electrons. C) They form between atoms with similar electronegativity. D) They are responsible for the high melting and boiling points of many molecules.
A) Hydrogen bonding B) London dispersion forces C) Dipole-dipole interactions D) Covalent bonding
A) They occupy a significant volume. B) They have specific shapes. C) They are constantly in motion. D) They attract each other strongly
A) gases expand to fill their container. B) solids are rigid and have definite shapes C) all three statements are true. D) liquids flow easily and have indefinite shapes.
A) directly proportional to its temperature B) constant C) dependent on the container size. D) inversely proportional to its temperature
A) V B) P C) R D) K
A) wood decreases, while the mass of the products remains constant. B) wood and oxygen is equal to the mass of the carbon dioxide and water vapor. C) wood and oxygen is greater than the mass of the products. D) wood and oxygen is less than the mass of the products.
A) elements are used directly. B) compounds are ignored. C) are not needed, only the coefficients are important. D) reactants and products are used to convert between grams and moles.
A) memorize the names of all elements and compounds. B) balance the chemical equation first. C) perform complex mathematical calculations. D) know the physical properties of all the reactants and 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) 2:3 B) Cannot be determined without additional information. C) 1:2 D) 1:3/2
A) 2 grams of hydrogen react with 1 gram of oxygen to produce water. B) Hydrogen and oxygen react explosively to form water. C) Two molecules of hydrogen react with one molecule of oxygen to form two molecules of water. D) Water can decompose into hydrogen and oxygen under specific conditions.
A) elements that can form more than one compound with another element. B) only elements, not compounds. C) all chemical reactions. D) compounds that can react with each other.
A) the relative amounts of each molecule or atom involved in the reaction. B) the order in which the reactants combine. C) the names of the reactants and products D) the states of matter of the reactants and products.
A) Cannot be determined without additional information. B) 10 moles C) 2.5 moles D) 5 moles |