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