Chemistry ChR-6 True/False
True/False A mixture of sand and water is homogeneous
False
True/False A mole of atoms is 6.022 x 10 -23 atoms
False
True/False A sample of 6.022 x 1023 12C atoms has a mass of 12.011 g
False
True/False All atoms of a given element are identical
False
True/False All matter exhibits either particulate or wave properties exclusively
False
True/False Chemical compounds are named using the same procedure whether the compound is ionic or covalent.
False
True/False Double bonds consist of one σ (sigma) and two π (pi) bonds
False
True/False If a given atom has more valence electrons in the Lewis structure we've drawn compared to a free isolated atom of that element, it will bear a formal positive charge
False
True/False Once a scientific theory (model) is formulated, it can never be changed
False
True/False Soluble ionic compounds and weak acids are strong electrolytes
False
True/False The reactant with the highest molar mass is always the limiting reactant
False
True/False Water is a great solvent because it is non-polar, which allows it to interact well with a range of different solute particles
False
True/False When a metal reacts with a nonmetal, a covalent bond is typically formed
False
True/False A molecular formula cannot be written for an ionic compound
False
True/False All matter exhibits either particulate or wave properties exclusively
False
True/False Scientific thinking is useful only for science and has no application in everyday life
False
True/False Soluble ionic compounds and weak acids are strong electrolytes
False
True/False Weak acids completely ionize in aqueous solution
False
True/False Double bonds consist of one sigma and two pi bonds
False Double bond is two sigma and one pi bond
True/False The reactant with the highest molar mass is always the limiting reactant.
False The reactant with the lowest molar mass is the limiting reactant
True/False Water is a great solvent because it is non-polar, which allows it to interact well with a range of different solute particles
False Water is polar
True/False When naming a compound with a metal that can form more than one cation, a prefix is used to indicate the number of atoms of the metal.
False a prefix is for nonmetal and nonmetal
True/False An oxidizing agent is reduced in a redox reaction; its oxidation number becomes more positive
False its oxidation number becomes more negative
True/False Molarity is the number of moles of solute per liter of solvent (mol/L)
False moles of solute/liter of solution
True/False Lone pairs of electrons always occupy the equatorial sites in an octahedron
False vertical sites in an octahedron
True/False A mole of atoms is 6.022x10^-23
False 6.022x10^23
True/False The Bond Energy (symbol D) of a chemical bond is the energy released when 1 moles of a given bond is broken in the gas phase
False The bond energy aka bond dissociation energy is the energy required to break one mole of a particular type of covalent bond in a gas-phase compound. Energy released is listed as the negative of the BDE
True/False A 4s orbital is less penetrating than a 4f
False, f is a higher orbital
True/False The magnetic quantum number (ml) defines the shape of an atomic orbital
False, just l describes the shape
True/False Diamagnetic samples of matter are attracted towards externally applied magnetic fields
False, thats paramagnetic
True/False A 3p orbital is more penetrating than a 3d
True
True/False A molecular formula cannot be written for an ionic compound
True
True/False A precipitation reaction results in a heterogeneous mixture
True
True/False A triple covalent bond is expected to be shorter and stronger than a double bond.
True
True/False An extensive property is dependent upon the quantity of matter under consideration
True
True/False Areas of zero probability of finding an electron are called nodes
True
True/False Chemistry links micro-and macroscopic viewpoints using symbolism
True
True/False Covalent bonds are present in the chlorate anion
True
True/False In a double covalent bond, two atoms share two pairs of electrons
True
True/False Isotopes have the same number of protons but different numbers of neutrons
True
True/False Orbitals are conserved, both in the valence bond and molecular orbital models
True
True/False Oxidation and Reduction must both occur in a redox reaction
True
True/False Resonance forms differ only in the distribution of electrons shown, and not in the distribution of atoms.
True
True/False The Heisenberg Uncertainty principle states that we cannot know both the position and momentum of an electron simultaneously
True
True/False The equivalence point of a titration is when the reactants have been combined in stoichiometric proportions
True
True/False The formula unit of an ionic compound gives the smallest whole number ratio of ions present
True
True/False The limiting reactant is all used up in a reaction and hence limits the amount of product we can make
True
True/False The molar mass of AsH3 is 77.95 g/mol
True
True/False The photoelectric effect can be explained by thinking of electromagnetic radiation as consisting of packets of energy called 'photons'
True
True/False There are 27 oxygen atoms in three formula units of Al(NO3)3.
True
True/False When working with large numbers of particles, like atoms or molecules, the easiest way to count them is actually by relating the mass of the sample to the number of particles present.
True
True/False A triple covalent bond is expected to be shorter and stronger than a double covalent bond.
True
True/False An extensive property is dependent upon the quantity of matter under consideration
True
True/False Chemistry links micro- and macroscopic viewpoints using symbolism
True
True/False Hybridized atomic orbitals are mathematical combinations of the standard orbitals on a single atom
True
True/False Ionic bonding is favored when atoms of low ionization energy react with atoms of high(very negative) electron affinity
True
True/False Isotopes have the same number of protons but different numbers of neutrons
True
True/False Neutral atoms of different elements cannot be isoelectronic
True
True/False Orbitals are conserved, both in the valence bond and molecular orbital models
True
True/False Oxidation and Reduction must both occur in a redox reaction
True
True/False Radicals illustrate an exception to the octet rule.
True
True/False The equivalence point of a titration is when the reactants have been combined in stoichiometric proportions
True
True/False The limiting reactant is all used up in a reaction, and hence limits the amount of product we can make.
True
True/False The molecular mass of HBr is 80.91 g/mol
True
True/False When working with large numbers of particles, like atoms or molecules, the easiest way to count them is actually by relating the mass of the sample to the number of particles present
True
True/False The Schrodinger equation is used to find the probability of finding an electron at a given point
True HxWave function = E xWave function
