A) Carbon and oxygen B) Sulphur and oxygen C) Oxygen and hydrogen D) Nitrogen and oxygen
A) X2Y3 B) X3Y2 C) X2Y D) XY2
A) 1 and 3 B) 2 and 3 C) 6 and 2 D) 8 and 2
A) +8 B) +7 C) -7 D) -5
A) Melting B) Sublimation C) Evaporation D) Crystallisation
A) Sulphur B) Potassium C) Argon D) Chlorine
A) Neutrons between two atoms B) Electrons between two atoms C) Electrons from one atom to another D) Protons between two atoms
A) NH3 B) H2O C) CO2 D) NaCl
A) Sharing of electrons between atoms B) Presence of positive ions in a sea of delocalized electrons C) Formation of covalent bonds between atoms D) Transfer of electrons between atoms
A) Carbon dioxide B) Water C) Sodium chloride D) Iron
A) Electron affinity of atoms B) Atomic radius of atoms C) All of the above D) Electronegativity difference between atoms
A) Nitrogen B) Carbon C) Helium D) Oxygen
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) Ethanol (C2H5OH) B) Sodium chloride (NaCl) C) Methane (CH4) D) Hydrogen peroxide (H2O2)
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 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) Digestion of food B) Melting of ice C) Burning of wood D) Rusting of iron
A) Pressure and volume of a gas B) Volume and number of moles of a gas C) Pressure and temperature of a gas D) Temperature and volume of a gas
A) P = V/nRT B) PV = RT C) PV = nRT D) PV = nT
A) Volume B) Square root of its molar mass C) Pressure D) Temperature
A) Density B) Number of moles C) Volume D) Atomic mass
A) Atoms in one mole of a substance B) Moles in one liter of a gas 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) High similarity in electronegativity D) Similar electron affinity values
A) Helium B) Chlorine C) Sodium D) Oxygen
A) They can be polar or non-polar B) They involve sharing electrons. C) They are responsible for the high melting and boiling points of many molecules. D) They form between atoms with similar electronegativity.
A) Dipole-dipole interactions B) London dispersion forces C) Hydrogen bonding D) Covalent bonding
A) They attract each other strongly B) They have specific shapes. C) They are constantly in motion. D) They occupy a significant volume.
A) gases expand to fill their container. B) solids are rigid and have definite shapes C) all three statements are true. D) liquids flow easily and have indefinite shapes.
A) inversely proportional to its temperature B) dependent on the container size. C) constant D) directly proportional to its temperature
A) P B) K C) V D) R
A) wood and oxygen is equal to the mass of the carbon dioxide and water vapor. 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 less than the mass of the products.
A) are not needed, only the coefficients are important. B) compounds are ignored. C) reactants and products are used to convert between grams and moles. D) elements are used directly.
A) memorize the names of all elements and compounds. B) balance the chemical equation first. C) perform complex mathematical calculations. D) know the physical properties of all the reactants and products.
A) The color of a compound can vary depending on its source. B) All samples of table salt (NaCl) have the same ratio of sodium to chlorine. 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) 2:3 B) Cannot be determined without additional information. C) 1:3/2 D) 1:2
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) elements that can form more than one compound with another element. B) only elements, not compounds. C) all chemical reactions. D) compounds that can react with each other.
A) the relative amounts of each molecule or atom involved in the reaction. B) the order in which the reactants combine. C) the names of the reactants and products D) the states of matter of the reactants and products.
A) 10 moles B) Cannot be determined without additional information. C) 5 moles D) 2.5 moles |