A) Carbon and oxygen B) Nitrogen and oxygen C) Oxygen and hydrogen D) Sulphur and oxygen
A) CH3 B) CH2 C) CH4 D) C2H4
A) CH4O B) CH2O C) CHO D) CH3O
A) XY2 B) X2Y C) X3Y2 D) X2Y3
A) 2 and 3 B) 1 and 3 C) 8 and 2 D) 6 and 2
A) Molar mass B) Oxidation numbers C) Atomic mass D) No of moles
A) +7 B) -5 C) +8 D) -7
A) Evaporation B) Crystallisation C) Sublimation D) Melting
A) 32 B) 22 C) 10 D) 20
A) 21.33% B) 28.07% C) 14.71% D) 42.66%
A) 164 B) 346 C) 160 D) 328
A) Argon B) Sulphur C) Chlorine D) Potassium
A) Electrons between two atoms B) Electrons from one atom to another C) Protons between two atoms D) Neutrons between two atoms
A) H2O B) NaCl C) NH3 D) CO2
A) Formation of covalent bonds between atoms B) Sharing of electrons between atoms C) Presence of positive ions in a sea of delocalized electrons D) Transfer of electrons between atoms
A) Iron B) Carbon dioxide C) Water D) Sodium chloride
A) Atomic radius of atoms B) Electron affinity of atoms C) All of the above D) Electronegativity difference between atoms
A) Helium B) Nitrogen C) Oxygen D) Carbon
A) Methane (CH4) B) Ethanol (C2H5OH) C) Ammonia (NH3) D) Carbon dioxide (CO2)
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) Hydrogen peroxide (H2O2) B) Methane (CH4) C) Ethanol (C2H5OH) D) Sodium chloride (NaCl)
A) Are closely packed together B) Have fixed positions in a lattice structure C) Have negligible volume compared to the space they occupy D) Have strong intermolecular forces of attraction
A) The chemical reactions occurring within a gas B) The density of particles within a gas C) The arrangement of particles 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 far apart and moving randomly C) Have particles that are highly compressed and far apart D) Have particles that are highly compressed and free to move
A) Burning of wood B) Digestion of food C) Rusting of iron D) Melting of ice
A) Pressure and temperature of a gas B) Volume and number of moles 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 Charles's law B) Boyle's law and Avogadro's law C) Charles's law and Avogadro's law D) Boyle's law, Charles's law, and Avogadro's law
A) P = V/nRT B) PV = RT C) PV = nRT D) PV = nT
A) Temperature B) Pressure C) Volume D) Square root of its molar mass
A) Density B) Number of moles C) Volume D) Atomic mass
A) Particles in one gram of a substance B) Atoms in one mole of a substance C) Electrons in one atom of a substance D) Moles in one liter of a gas
A) CO2 B) NH3 C) H2O D) HCN
A) High similarity in electronegativity B) Large difference in electronegativity C) Similar electron affinity values D) Both elements are non-metals
A) Chlorine B) Sodium C) Helium D) Oxygen
A) They involve sharing electrons. B) They are responsible for the high melting and boiling points of many molecules. C) They form between atoms with similar electronegativity. D) They can be polar or non-polar
A) Dipole-dipole interactions B) Hydrogen bonding C) London dispersion forces D) Covalent bonding
A) They have specific shapes. B) They occupy a significant volume. C) They are constantly in motion. D) They attract each other strongly
A) all three statements are true. B) gases expand to fill their container. C) liquids flow easily and have indefinite shapes. D) solids are rigid and have definite shapes
A) inversely proportional to its temperature B) dependent on the container size. C) constant D) directly proportional to its temperature
A) P B) V C) K D) R
A) wood and oxygen is equal to the mass of the carbon dioxide and water vapor. 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 decreases, while the mass of the products remains constant.
A) elements are used directly. B) compounds are ignored. C) reactants and products are used to convert between grams and moles. 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) memorize the names of all elements and compounds. D) perform complex mathematical calculations.
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) Carbon dioxide (CO₂) has a constant ratio of carbon to oxygen, regardless of its origin. D) Water (H₂O) always contains hydrogen and oxygen in a 2:1 ratio by mass.
A) 1:3/2 B) Cannot be determined without additional information. C) 1:2 D) 2:3
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) Water can decompose into hydrogen and oxygen under specific conditions. D) Hydrogen and oxygen react explosively to form water.
A) all chemical reactions. B) elements that can form more than one compound with another element. C) compounds that can react with each other. D) only elements, not compounds.
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) 5 moles B) 10 moles C) Cannot be determined without additional information. D) 2.5 moles |