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