A) Carbon and oxygen B) Nitrogen and oxygen C) Oxygen and hydrogen D) Sulphur and oxygen
A) CH3 B) CH4 C) CH2 D) C2H4
A) CH4O B) CH3O C) CHO D) CH2O
A) X2Y3 B) X2Y C) XY2 D) X3Y2
A) 8 and 2 B) 6 and 2 C) 2 and 3 D) 1 and 3
A) Molar mass B) Atomic mass C) No of moles D) Oxidation numbers
A) +8 B) +7 C) -7 D) -5
A) Melting B) Evaporation C) Sublimation D) Crystallisation
A) 10 B) 22 C) 20 D) 32
A) 21.33% B) 42.66% C) 28.07% D) 14.71%
A) 160 B) 328 C) 164 D) 346
A) Argon B) Potassium C) Chlorine D) Sulphur
A) Protons between two atoms B) Electrons from one atom to another C) Electrons between two atoms D) Neutrons between two atoms
A) CO2 B) H2O C) NH3 D) NaCl
A) Presence of positive ions in a sea of delocalized electrons B) Transfer of electrons between atoms C) Formation of covalent bonds between atoms D) Sharing of electrons between atoms
A) Iron B) Carbon dioxide C) Water D) Sodium chloride
A) Electron affinity of atoms B) Atomic radius of atoms C) All of the above D) Electronegativity difference between atoms
A) Helium B) Nitrogen C) Oxygen D) Carbon
A) Ammonia (NH3) B) Ethanol (C2H5OH) C) Methane (CH4) D) Carbon dioxide (CO2)
A) Strong electrostatic attractions between ions B) Strong covalent bonds between atoms C) Weak intermolecular forces between molecules D) Weak intramolecular forces within molecules
A) Hydrogen peroxide (H2O2) B) Ethanol (C2H5OH) C) Sodium chloride (NaCl) D) Methane (CH4)
A) Have negligible volume compared to the space they occupy B) Have fixed positions in a lattice structure C) Have strong intermolecular forces of attraction 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 far apart and moving randomly B) Have particles that are highly compressed and far apart C) Have particles that are closely packed together and vibrate in fixed positions D) Have particles that are highly compressed and free to move
A) Rusting of iron B) Melting of ice C) Burning of wood D) Digestion of food
A) Pressure and temperature of a gas B) Volume and number of moles of a gas C) Temperature and volume of a gas D) Pressure and volume of a gas
A) Pressure and volume of a gas B) Temperature and volume of a gas C) Volume and number of moles 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, Charles's law, and Avogadro's law D) Boyle's law and Avogadro's law
A) P = V/nRT B) PV = RT C) PV = nT D) PV = nRT
A) Pressure B) Square root of its molar mass C) Volume D) Temperature
A) Density B) Atomic mass C) Number of moles D) Volume
A) Atoms in one mole of a substance B) Electrons in one atom of a substance C) Moles in one liter of a gas D) Particles in one gram of a substance
A) HCN B) CO2 C) NH3 D) H2O
A) High similarity in electronegativity B) Similar electron affinity values C) Large difference in electronegativity D) Both elements are non-metals
A) Helium B) Oxygen C) Sodium D) Chlorine
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 have specific shapes. B) They occupy a significant volume. C) They attract each other strongly D) They are constantly in motion.
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) R B) V C) P 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) compounds are ignored. B) reactants and products are used to convert between grams and moles. C) are not needed, only the coefficients are important. D) elements are used directly.
A) balance the chemical equation first. B) perform complex mathematical calculations. C) memorize the names of all elements and compounds. D) know the physical properties of all the reactants and products.
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) 1:3/2 B) 1:2 C) 2:3 D) Cannot be determined without additional information.
A) Two molecules of hydrogen react with one molecule of oxygen to form two molecules of water. B) Hydrogen and oxygen react explosively to form water. C) Water can decompose into hydrogen and oxygen under specific conditions. 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) only elements, not compounds. C) all chemical reactions. 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 order in which the reactants combine. D) the names of the reactants and products
A) 5 moles B) 2.5 moles C) 10 moles D) Cannot be determined without additional information. |