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