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