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