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