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