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