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