A) Oxygen and hydrogen B) Sulphur and oxygen C) Nitrogen and oxygen D) Carbon and oxygen
A) CH2 B) CH4 C) CH3 D) C2H4
A) CH4O B) CH3O C) CHO D) CH2O
A) XY2 B) X3Y2 C) X2Y3 D) X2Y
A) 6 and 2 B) 2 and 3 C) 1 and 3 D) 8 and 2
A) Atomic mass B) Molar mass C) No of moles D) Oxidation numbers
A) +7 B) +8 C) -7 D) -5
A) Evaporation B) Sublimation C) Crystallisation D) Melting
A) 20 B) 22 C) 10 D) 32
A) 28.07% B) 14.71% C) 42.66% D) 21.33%
A) 164 B) 346 C) 160 D) 328
A) Chlorine B) Potassium C) Argon D) Sulphur
A) Electrons from one atom to another B) Electrons between two atoms C) Neutrons between two atoms D) Protons between two atoms
A) NaCl B) NH3 C) CO2 D) H2O
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) Carbon dioxide B) Sodium chloride C) Iron D) Water
A) Electron affinity of atoms B) All of the above C) Electronegativity difference between atoms D) Atomic radius of atoms
A) Nitrogen B) Oxygen C) Carbon D) Helium
A) Carbon dioxide (CO2) B) Ethanol (C2H5OH) C) Ammonia (NH3) D) Methane (CH4)
A) Strong electrostatic attractions between ions B) Weak intramolecular forces within molecules C) Strong covalent bonds between atoms D) Weak intermolecular forces between molecules
A) Hydrogen peroxide (H2O2) B) Sodium chloride (NaCl) C) Ethanol (C2H5OH) D) Methane (CH4)
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 arrangement of particles within a gas B) The density 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 closely packed together and vibrate in fixed positions B) Have particles that are highly compressed and free to move C) Have particles that are highly compressed and far apart D) Have particles that are far apart and moving randomly
A) Digestion of food B) Rusting of iron C) Burning of wood D) Melting of ice
A) Pressure and volume of a gas B) Temperature and volume of a gas C) Pressure and temperature of a gas D) Volume and number of moles of a gas
A) Pressure and volume of a gas B) Volume and number of moles of a gas C) Temperature and volume of a gas D) Pressure and temperature of a gas
A) Charles's law and Avogadro's law B) Boyle's law and Charles's law C) Boyle's law, Charles's law, and Avogadro's law D) Boyle's law and Avogadro's law
A) PV = RT B) PV = nRT C) P = V/nRT D) PV = nT
A) Pressure B) Temperature C) Square root of its molar mass D) Volume
A) Volume B) Number of moles C) Density D) Atomic mass
A) Atoms in one mole of a substance B) Particles in one gram of a substance C) Moles in one liter of a gas D) Electrons in one atom of a substance
A) CO2 B) NH3 C) HCN D) H2O
A) Large difference in electronegativity B) Similar electron affinity values C) High similarity in electronegativity D) Both elements are non-metals
A) Helium B) Chlorine C) Sodium D) Oxygen
A) They are responsible for the high melting and boiling points of many molecules. B) They can be polar or non-polar C) They form between atoms with similar electronegativity. D) They involve sharing electrons.
A) London dispersion forces B) Covalent bonding C) Hydrogen bonding D) Dipole-dipole interactions
A) They have specific shapes. B) They are constantly in motion. C) They occupy a significant volume. 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) P B) V 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 decreases, while the mass of the products remains constant. D) wood and oxygen is equal to the mass of the carbon dioxide and water vapor.
A) reactants and products are used to convert between grams and moles. B) compounds are ignored. C) are not needed, only the coefficients are important. D) elements are used directly.
A) balance the chemical equation first. B) memorize the names of all elements and compounds. C) perform complex mathematical calculations. D) know the physical properties of all the reactants and products.
A) Water (H₂O) always contains hydrogen and oxygen in a 2:1 ratio by mass. B) Carbon dioxide (CO₂) has a constant ratio of carbon to oxygen, regardless of its origin. C) All samples of table salt (NaCl) have the same ratio of sodium to chlorine. D) The color of a compound can vary depending on its source.
A) Cannot be determined without additional information. B) 2:3 C) 1:3/2 D) 1:2
A) 2 grams of hydrogen react with 1 gram of oxygen to produce water. B) Hydrogen and oxygen react explosively to form 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) elements that can form more than one compound with another element. B) compounds that can react with each other. C) all chemical reactions. D) only elements, not compounds.
A) the states of matter of the reactants and products. B) the order in which the reactants combine. C) the relative amounts of each molecule or atom involved in the reaction. D) the names of the reactants and products
A) 5 moles B) Cannot be determined without additional information. C) 10 moles D) 2.5 moles |