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