CHEM 120 Review Quiz Solutions With Advanced Questions And Answers.

What is a negative control? - correct answer Group in which no response is expected This is the name of the variable in a scientific experiment that is controlled by the scientist - correct answer Independent Variable You have a sample with a mass of 25 g and a volume of 2.8 ml. What is the density of this sample? - correct answer 8.9 g/mL Which of the below subatomic particles has the lowest mass? - correct answer electrons How many valence electrons are there in an atom of Neon? - correct answer 8 How many pounds (lbs) are in 58 kg? - correct answer 127.6 lbs Which atom would have an electron configuration of 1s2 2s2 2p6 3s2 3p6? - correct answer Ar Determine how many electrons you would expect each of the following ions and ground state atoms to contain and match them up. - correct answer a. Fluoride 10 b. Fluorine 9 c. Zn(I) 29 d. Calcium ion 18 A ground state atom (uncharged atom) gains 3 electrons. This atom will now have a charge of: - correct answer -3 What is the correct Lewis Dot Structure for Phosphorous? - correct answer .. .P. . What would be the chemical formula for Strontium Chloride? - correct answer SrCl2 What is the chemical formula of Dinitrogen Tetroxide? - correct answer N2O4 What are valance electrons? - correct answer The outermost electrons All isotopes of Oxygen must have - correct answer 8 protons A neutron has (select all that apply) - correct answer A charge of 0 How many protons do all isotopes of Cu have? - correct answer 29 If an isotope of Li contains 5 neutrons, what is the mass number of this isotope of Li? - correct answer 8 Select all of the following molecules that you would expect to have the Trigonal Pyramidal shape. (select all that apply) - correct answer PF3 NH3 All isotopes of an atom MUST share the same - correct answer Number of protons Select all formulas that would be considered to be ionic compounds - correct answer NaNO2 AlF3 FeBr2 Match each of the following bonds with the electron behavior observed. - correct answer Polar covalent bond Electrons are shared unequally b. Nonpolar covalent bond Electrons are shared equally c. Ionic Bond Electrons are transferred from one atom to another