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