A) Nitrogen and oxygen B) Carbon and oxygen C) Oxygen and hydrogen D) Sulphur and oxygen
A) C2H4 B) CH4 C) CH2 D) CH3
A) CH2O B) CH3O C) CH4O D) CHO
A) X3Y2 B) X2Y3 C) XY2 D) X2Y
A) 8 and 2 B) 1 and 3 C) 2 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) Sublimation B) Crystallisation C) Melting D) Evaporation
A) 10 B) 20 C) 22 D) 32
A) 42.66% B) 28.07% C) 21.33% D) 14.71%
A) 160 B) 346 C) 328 D) 164
A) Potassium B) Chlorine C) Argon D) Sulphur
A) Electrons between two atoms B) Protons between two atoms C) Neutrons between two atoms D) Electrons from one atom to another
A) NH3 B) NaCl C) H2O D) CO2
A) Sharing of electrons between atoms B) Formation of covalent bonds between atoms C) Presence of positive ions in a sea of delocalized electrons D) Transfer of electrons between atoms
A) Water B) Carbon dioxide C) Sodium chloride D) Iron
A) Atomic radius of atoms B) All of the above C) Electronegativity difference between atoms D) Electron affinity of atoms
A) Helium B) Carbon C) Nitrogen D) Oxygen
A) Ammonia (NH3) B) Methane (CH4) C) Carbon dioxide (CO2) D) Ethanol (C2H5OH)
A) Weak intermolecular forces between molecules B) Weak intramolecular forces within molecules C) Strong electrostatic attractions between ions D) Strong covalent bonds between atoms
A) Sodium chloride (NaCl) B) Ethanol (C2H5OH) C) Methane (CH4) 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 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 far apart B) Have particles that are far apart and moving randomly C) Have particles that are highly compressed and free to move D) Have particles that are closely packed together and vibrate in fixed positions
A) Melting of ice B) Digestion of food C) Burning of wood D) Rusting of iron
A) Volume and number of moles of a gas B) Pressure and temperature 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) Temperature and volume of a gas D) Volume and number of moles of a gas
A) Boyle's law and Avogadro's law B) Charles's law and Avogadro's law C) Boyle's law, Charles's law, and Avogadro's law D) Boyle's law and Charles's law
A) P = V/nRT B) PV = nT C) PV = RT D) PV = nRT
A) Volume B) Temperature C) Square root of its molar mass D) Pressure
A) Volume B) Atomic mass C) Number of moles D) Density
A) Particles in one gram of a substance B) Moles in one liter of a gas C) Atoms in one mole of a substance D) Electrons in one atom of a substance
A) H2O B) HCN C) NH3 D) CO2
A) Both elements are non-metals B) Similar electron affinity values C) Large difference in electronegativity D) High similarity in electronegativity
A) Oxygen B) Chlorine C) Helium D) Sodium
A) They involve sharing electrons. B) They form between atoms with similar electronegativity. C) They are responsible for the high melting and boiling points of many molecules. D) They can be polar or non-polar
A) Covalent bonding B) London dispersion forces C) Hydrogen bonding D) Dipole-dipole interactions
A) They occupy a significant volume. B) They are constantly in motion. C) They attract each other strongly D) They have specific shapes.
A) all three statements are true. B) liquids flow easily and have indefinite shapes. C) solids are rigid and have definite shapes D) gases expand to fill their container.
A) inversely proportional to its temperature B) directly proportional to its temperature C) constant D) dependent on the container size.
A) P B) R C) K D) V
A) wood decreases, while the mass of the products remains constant. 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 and oxygen is greater than the mass of the products.
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) balance the chemical equation first. B) know the physical properties of all the reactants and products. C) memorize the names of all elements and compounds. D) perform complex mathematical calculations.
A) Carbon dioxide (CO₂) has a constant ratio of carbon to oxygen, regardless of its origin. 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) Water (H₂O) always contains hydrogen and oxygen in a 2:1 ratio by mass.
A) 2:3 B) Cannot be determined without additional information. C) 1:3/2 D) 1:2
A) Two molecules of hydrogen react with one molecule of oxygen to form two molecules of 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) Hydrogen and oxygen react explosively to form water.
A) only elements, not compounds. B) elements that can form more than one compound with another element. C) all chemical reactions. D) compounds that can react with each other.
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) 5 moles B) 2.5 moles C) 10 moles D) Cannot be determined without additional information. |