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