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