A) Sulphur and oxygen B) Nitrogen and oxygen C) Oxygen and hydrogen D) Carbon and oxygen
A) CH4 B) CH2 C) C2H4 D) CH3
A) CH2O B) CH4O C) CHO D) CH3O
A) X2Y3 B) X3Y2 C) XY2 D) X2Y
A) 1 and 3 B) 8 and 2 C) 6 and 2 D) 2 and 3
A) Molar mass B) No of moles C) Oxidation numbers D) Atomic mass
A) -7 B) +7 C) +8 D) -5
A) Melting B) Crystallisation C) Sublimation D) Evaporation
A) 20 B) 32 C) 10 D) 22
A) 42.66% B) 21.33% C) 28.07% D) 14.71%
A) 164 B) 160 C) 346 D) 328
A) Potassium B) Chlorine C) Sulphur D) Argon
A) Electrons between two atoms B) Neutrons between two atoms C) Protons between two atoms D) Electrons from one atom to another
A) NaCl B) NH3 C) CO2 D) H2O
A) Transfer of electrons between atoms B) Presence of positive ions in a sea of delocalized electrons C) Formation of covalent bonds between atoms D) Sharing of electrons between atoms
A) Sodium chloride B) Water C) Iron D) Carbon dioxide
A) All of the above B) Electron affinity of atoms C) Atomic radius of atoms D) Electronegativity difference between atoms
A) Carbon B) Oxygen C) Helium D) Nitrogen
A) Carbon dioxide (CO2) B) Methane (CH4) C) Ammonia (NH3) D) Ethanol (C2H5OH)
A) Weak intramolecular forces within molecules B) Weak intermolecular forces between molecules C) Strong electrostatic attractions between ions D) Strong covalent bonds between atoms
A) Ethanol (C2H5OH) B) Hydrogen peroxide (H2O2) C) Sodium chloride (NaCl) D) Methane (CH4)
A) Have fixed positions in a lattice structure B) Have strong intermolecular forces of attraction C) Are closely packed together D) Have negligible volume compared to the space they occupy
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 far apart and moving randomly B) Have particles that are highly compressed and far apart C) Have particles that are highly compressed and free to move D) Have particles that are closely packed together and vibrate in fixed positions
A) Rusting of iron B) Melting of ice C) Digestion of food D) Burning of wood
A) Temperature and volume of a gas B) Pressure and temperature of a gas C) Volume and number of moles of a gas D) Pressure and volume of a gas
A) Temperature and volume of a gas B) Volume and number of moles of a gas C) Pressure and volume of a gas D) Pressure and temperature of a gas
A) Boyle's law and Avogadro's law B) Charles's law and Avogadro's law C) Boyle's law, Charles's law, and Avogadro's law D) Boyle's law and Charles's law
A) PV = RT B) PV = nRT C) P = V/nRT D) PV = nT
A) Pressure B) Temperature C) Volume D) Square root of its molar mass
A) Number of moles B) Atomic mass C) Volume D) Density
A) Particles in one gram of a substance B) Electrons in one atom of a substance C) Moles in one liter of a gas D) Atoms in one mole of a substance
A) HCN B) H2O C) NH3 D) CO2
A) Both elements are non-metals B) Similar electron affinity values C) High similarity in electronegativity D) Large difference in electronegativity
A) Helium B) Chlorine 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) London dispersion forces B) Covalent bonding C) Dipole-dipole interactions D) Hydrogen bonding
A) They attract each other strongly B) They are constantly in motion. C) They have specific shapes. D) They occupy a significant volume.
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) dependent on the container size. B) directly proportional to its temperature C) inversely proportional to its temperature D) constant
A) V B) K C) R D) P
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 and oxygen is equal to the mass of the carbon dioxide and water vapor. D) wood decreases, while the mass of the products remains constant.
A) reactants and products are used to convert between grams and moles. B) are not needed, only the coefficients are important. C) elements are used directly. D) compounds are ignored.
A) know the physical properties of all the reactants and products. B) balance the chemical equation first. C) perform complex mathematical calculations. D) memorize the names of all elements and compounds.
A) Carbon dioxide (CO₂) has a constant ratio of carbon to oxygen, regardless of its origin. B) The color of a compound can vary depending on its source. 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) 1:2 B) 1:3/2 C) 2:3 D) Cannot be determined without additional information.
A) 2 grams of hydrogen react with 1 gram of oxygen to produce water. B) Water can decompose into hydrogen and oxygen under specific conditions. C) Two molecules of hydrogen react with one molecule of oxygen to form two molecules of water. D) Hydrogen and oxygen react explosively to form water.
A) all chemical reactions. B) only elements, not compounds. C) elements that can form more than one compound with another element. D) compounds that can react with each other.
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) 10 moles B) 2.5 moles C) Cannot be determined without additional information. D) 5 moles |