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