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