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