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