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