A) Carbon and oxygen B) Oxygen and hydrogen C) Sulphur and oxygen D) Nitrogen and oxygen
A) CH2 B) CH3 C) C2H4 D) CH4
A) CH2O B) CH3O C) CH4O D) CHO
A) X3Y2 B) X2Y3 C) XY2 D) X2Y
A) 8 and 2 B) 1 and 3 C) 6 and 2 D) 2 and 3
A) Atomic mass B) Molar mass C) Oxidation numbers D) No of moles
A) +7 B) +8 C) -5 D) -7
A) Evaporation B) Crystallisation C) Sublimation D) Melting
A) 22 B) 20 C) 10 D) 32
A) 14.71% B) 28.07% C) 42.66% D) 21.33%
A) 328 B) 164 C) 160 D) 346
A) Chlorine B) Sulphur C) Argon D) Potassium
A) Electrons between two atoms B) Protons between two atoms C) Electrons from one atom to another D) Neutrons between two atoms
A) NH3 B) NaCl C) CO2 D) H2O
A) Presence of positive ions in a sea of delocalized electrons B) Transfer of electrons between atoms C) Sharing of electrons between atoms D) Formation of covalent bonds between atoms
A) Sodium chloride B) Iron C) Water D) Carbon dioxide
A) Atomic radius of atoms B) Electron affinity of atoms C) Electronegativity difference between atoms D) All of the above
A) Nitrogen B) Oxygen C) Carbon D) Helium
A) Carbon dioxide (CO2) B) Methane (CH4) C) Ethanol (C2H5OH) D) Ammonia (NH3)
A) Weak intramolecular forces within molecules B) Weak intermolecular forces between molecules C) Strong covalent bonds between atoms D) Strong electrostatic attractions between ions
A) Ethanol (C2H5OH) B) Sodium chloride (NaCl) C) Hydrogen peroxide (H2O2) D) Methane (CH4)
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 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) Have particles that are closely packed together and vibrate in fixed positions B) Have particles that are highly compressed and free to move C) Have particles that are highly compressed and far apart D) Have particles that are far apart and moving randomly
A) Burning of wood B) Rusting of iron C) Digestion of food D) Melting of ice
A) Pressure and volume of a gas B) Pressure and temperature of a gas C) Volume and number of moles of a gas D) Temperature and volume of a gas
A) Pressure and volume of a gas B) Volume and number of moles of a gas C) Pressure and temperature of a gas D) Temperature and volume of a gas
A) Boyle's law, Charles's law, and Avogadro's law B) Boyle's law and Avogadro's law C) Charles's law and Avogadro's law D) Boyle's law and Charles's law
A) P = V/nRT B) PV = nRT C) PV = RT D) PV = nT
A) Square root of its molar mass B) Pressure C) Volume D) Temperature
A) Number of moles B) Density C) Atomic mass D) Volume
A) Particles in one gram of a substance B) Moles in one liter of a gas C) Electrons in one atom of a substance D) Atoms in one mole of a substance
A) NH3 B) HCN C) CO2 D) H2O
A) Large difference in electronegativity B) High similarity in electronegativity C) Similar electron affinity values D) Both elements are non-metals
A) Chlorine B) Helium C) Oxygen D) Sodium
A) They involve sharing electrons. B) They form between atoms with similar electronegativity. C) They can be polar or non-polar D) They are responsible for the high melting and boiling points of many molecules.
A) Hydrogen bonding B) Dipole-dipole interactions C) London dispersion forces D) Covalent bonding
A) They are constantly in motion. B) They have specific shapes. C) They occupy a significant volume. D) They attract each other strongly
A) all three statements are true. B) liquids flow easily and have indefinite shapes. C) gases expand to fill their container. D) solids are rigid and have definite shapes
A) constant B) inversely proportional to its temperature C) dependent on the container size. D) directly proportional to its temperature
A) V B) R C) P D) K
A) wood decreases, while the mass of the products remains constant. 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 and oxygen is greater than the mass of the products.
A) reactants and products are used to convert between grams and moles. B) elements are used directly. C) are not needed, only the coefficients are important. D) compounds are ignored.
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) 2:3 B) Cannot be determined without additional information. C) 1:2 D) 1:3/2
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) elements that can form more than one compound with another element. B) only elements, not compounds. C) all chemical reactions. D) compounds that can react with each other.
A) the relative amounts of each molecule or atom involved in the reaction. B) the states of matter of the reactants and products. C) the names of the reactants and products D) the order in which the reactants combine.
A) 2.5 moles B) 10 moles C) 5 moles D) Cannot be determined without additional information. |