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