A) Oxygen and hydrogen B) Nitrogen and oxygen C) Carbon and oxygen D) Sulphur and oxygen
A) XY2 B) X3Y2 C) X2Y3 D) X2Y
A) 1 and 3 B) 6 and 2 C) 2 and 3 D) 8 and 2
A) +7 B) +8 C) -7 D) -5
A) Sublimation B) Evaporation C) Melting D) Crystallisation
A) Potassium B) Argon C) Chlorine 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) NaCl B) CO2 C) H2O D) NH3
A) Transfer of electrons between atoms B) Formation of covalent bonds between atoms C) Presence of positive ions in a sea of delocalized electrons D) Sharing of electrons between atoms
A) Water B) Carbon dioxide C) Iron D) Sodium chloride
A) All of the above B) Atomic radius of atoms C) Electron affinity of atoms D) Electronegativity difference between atoms
A) Carbon B) Nitrogen C) Helium D) Oxygen
A) Strong electrostatic attractions between ions B) Weak intermolecular forces between molecules C) Strong covalent bonds between atoms D) Weak intramolecular forces within molecules
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 strong intermolecular forces of attraction C) Have fixed positions in a lattice structure D) Are closely packed together
A) The motion of particles within a gas B) The arrangement of particles within a gas C) The density of particles within a gas D) The chemical reactions occurring within a gas
A) Digestion of food B) Rusting of iron C) Burning of wood D) Melting of ice
A) Volume and number of moles of a gas B) Pressure and temperature of a gas C) Pressure and volume 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) Pressure D) Volume
A) Number of moles B) Volume C) Atomic mass D) Density
A) Particles in one gram of a substance B) Atoms in one mole of a substance C) Moles in one liter of a gas D) Electrons in one atom of a substance
A) HCN B) H2O C) CO2 D) NH3
A) Large difference in electronegativity B) High similarity in electronegativity C) Both elements are non-metals D) Similar electron affinity values
A) Chlorine B) Helium C) Sodium D) Oxygen
A) They are responsible for the high melting and boiling points of many molecules. B) They involve sharing electrons. C) They form between atoms with similar electronegativity. D) They can be polar or non-polar
A) London dispersion forces B) Covalent bonding C) Dipole-dipole interactions D) Hydrogen bonding
A) They are constantly in motion. B) They attract each other strongly C) They have specific shapes. D) They occupy a significant volume.
A) all three statements are true. B) gases expand to fill their container. C) solids are rigid and have definite shapes D) liquids flow easily and have indefinite shapes.
A) dependent on the container size. B) directly proportional to its temperature C) constant 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 decreases, while the mass of the products remains constant. C) wood and oxygen is greater than the mass of the products. D) wood and oxygen is less than the mass of the products.
A) elements are used directly. B) reactants and products are used to convert between grams and moles. C) are not needed, only the coefficients are important. D) compounds are ignored.
A) know the physical properties of all the reactants and products. B) memorize the names of all elements and compounds. C) balance the chemical equation first. D) perform complex mathematical calculations.
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) 1:3/2 B) 2:3 C) Cannot be determined without additional information. D) 1:2
A) Water can decompose into hydrogen and oxygen under specific conditions. 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) 2 grams of hydrogen react with 1 gram of oxygen to produce water.
A) compounds that can react with each other. B) only elements, not compounds. C) elements that can form more than one compound with another element. D) all chemical reactions.
A) the names of the reactants and products B) the states of matter of the reactants and products. C) the order in which the reactants combine. D) the relative amounts of each molecule or atom involved in the reaction.
A) 5 moles B) 2.5 moles C) Cannot be determined without additional information. D) 10 moles |