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