A) Carbon and oxygen B) Oxygen and hydrogen C) Sulphur and oxygen D) Nitrogen and oxygen
A) CH3 B) CH2 C) CH4 D) C2H4
A) CH4O B) CH3O C) CHO D) CH2O
A) XY2 B) X2Y C) X2Y3 D) X3Y2
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) +8 D) -5
A) Evaporation B) Sublimation C) Crystallisation D) Melting
A) 22 B) 20 C) 32 D) 10
A) 42.66% B) 14.71% C) 28.07% D) 21.33%
A) 328 B) 160 C) 164 D) 346
A) Chlorine B) Argon C) Potassium D) Sulphur
A) Neutrons between two atoms B) Electrons from one atom to another C) Protons between two atoms D) Electrons between two atoms
A) H2O B) CO2 C) NaCl D) NH3
A) Transfer of electrons between atoms B) Formation of covalent bonds between atoms C) Presence of positive ions in a sea of delocalized electrons D) Sharing of electrons between atoms
A) Water B) Sodium chloride C) Iron D) Carbon dioxide
A) All of the above B) Electronegativity difference between atoms C) Atomic radius of atoms D) Electron affinity of atoms
A) Nitrogen B) Oxygen C) Helium D) Carbon
A) Ammonia (NH3) B) Carbon dioxide (CO2) C) Ethanol (C2H5OH) D) Methane (CH4)
A) Strong electrostatic attractions between ions B) Strong covalent bonds between atoms C) Weak intramolecular forces within molecules D) Weak intermolecular forces between molecules
A) Methane (CH4) B) Ethanol (C2H5OH) C) Hydrogen peroxide (H2O2) D) Sodium chloride (NaCl)
A) Are closely packed together B) Have negligible volume compared to the space they occupy C) Have strong intermolecular forces of attraction D) Have fixed positions in a lattice structure
A) The motion of particles within a gas B) The arrangement of particles within a gas C) The chemical reactions occurring within a gas D) The density of particles within a gas
A) Have particles that are highly compressed and far apart B) Have particles that are highly compressed and free to move C) Have particles that are far apart and moving randomly D) Have particles that are closely packed together and vibrate in fixed positions
A) Rusting of iron B) Melting of ice C) Burning of wood D) Digestion of food
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) 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) Boyle's law, Charles's law, and Avogadro's law B) Charles's law and Avogadro's law C) Boyle's law and Charles's law D) Boyle's law and Avogadro's law
A) PV = RT B) PV = nRT C) PV = nT D) P = V/nRT
A) Square root of its molar mass B) Pressure C) Temperature D) Volume
A) Number of moles B) Atomic mass C) Volume D) Density
A) Moles in one liter of a gas B) Particles in one gram of a substance C) Electrons in one atom of a substance D) Atoms in one mole of a substance
A) NH3 B) CO2 C) H2O D) HCN
A) Large difference in electronegativity B) Similar electron affinity values C) Both elements are non-metals D) High similarity in electronegativity
A) Helium B) Oxygen C) Sodium D) Chlorine
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) Dipole-dipole interactions B) Covalent bonding C) Hydrogen bonding D) London dispersion forces
A) They occupy a significant volume. B) They attract each other strongly C) They have specific shapes. D) They are constantly in motion.
A) all three statements are true. B) solids are rigid and have definite shapes C) gases expand to fill their container. D) liquids flow easily and have indefinite shapes.
A) inversely proportional to its temperature B) dependent on the container size. C) directly proportional to its temperature D) constant
A) R B) P C) V D) K
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 greater than the mass of the products. 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) memorize the names of all elements and compounds. B) know the physical properties of all the reactants and products. C) perform complex mathematical calculations. D) balance the chemical equation first.
A) All samples of table salt (NaCl) have the same ratio of sodium to chlorine. B) The color of a compound can vary depending on its source. C) Water (H₂O) always contains hydrogen and oxygen in a 2:1 ratio by mass. D) Carbon dioxide (CO₂) has a constant ratio of carbon to oxygen, regardless of its origin.
A) 1:2 B) Cannot be determined without additional information. C) 1:3/2 D) 2:3
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) compounds that can react with each other. D) all chemical reactions.
A) the order in which the reactants combine. B) the relative amounts of each molecule or atom involved in the reaction. C) the states of matter of the reactants and products. D) the names of the reactants and products
A) 2.5 moles B) 10 moles C) Cannot be determined without additional information. D) 5 moles |