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