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