Exams & Certification

2-D Lewis structure 3-D Lewis structure IF4+ Atom # of valence e per atom Total # of alence e v Te FITO ion Total (0.25 pt for electron accounting) F: 5 (0.75 pt) (0.25 pt) Electron group arrangement (0.25 pt): Molecular shape & class (0.25 pt ea): Shape: Class (AXmE.): Ideal Bond Angle(s) (list all […]

Which of these carries out the commands of a homeostatic control center? The Correct Answer and Explanation is : The correct answer is effectors. Effectors are the components in a homeostatic control system that carry out the commands or responses initiated by a homeostatic control center. In the context of homeostasis, the body maintains stable

A. Na3N, N204, CoF3, CF4, Pb3N2, KI, SAN2 Provide the NAME (not the formula) of all the ionic compounds with fixed metals. Identify the charge on each of those fixed metals (don’t forget that a charge has both a sign and number such as +1 or -3). B. Physical and Chemical Properties of Elements Group

Write the correct name for each of the following ionic compounds. 1. Ni(C2H3O2)2 2.Pb(HCO3)4 3.Al2S3 4.LiHSO4 5.Zn3(PO4)2 6.CoF3 7.Fe2(HPO4)3 8.Ca(CN)2 9. SnO2 10. Na2CrO4Write the correct name for each of the following ionic compounds. 2.Pb(HCO3)4 3.Al2S3 4.LiHSO4 5.Zn3(PO4)2 6.CoF3 7.Fe2(HPO4)3 8.Ca(CN)2 The Correct Answer and Explanation is : Here are the correct names for the

Compare and contrast the multiplication/division significant figure rule to the significant figure rule applied for addition/subtraction mathematical operations. Give examples. The Correct Answer and Explanation is : When performing mathematical operations, the rules for significant figures (sig figs) differ between multiplication/division and addition/subtraction. These rules help determine how many digits in the result are meaningful

Gold, which has a density of 19.32 g/cm3, is the most ductile metal and can be pressed into a thin leaf or drawn out into a long fiber. (a) If a sample of gold with a mass of 8.556 g, is pressed into a leaf of 5.931 μm thickness, what is the area of the

Gold, which has a density of 19.32g/cm^3, is sold by the troy ounce, which is 31.103 g. What is the volume, in cubic centimeters of 1.4 oz t of pure gold? The Correct Answer and Explanation is : To find the volume of 1.4 troy ounces of gold, we can use the formula that relates

1. What is a nodal plane? How are the number of nodal planes relate to the value of ℓ? 2. What is a radial node? How are the number of radial nodes related to the value of n and ℓ? 3. How many nodal planes does a p orbital have? How many does a d

Citric acid has three pKa values: 3.2,4.8,6.4. What are ratios of the coniuaate base to acid components of this buffer solution at a pH of 6.4 ? A. Conjugate base to acid ratio is 1:1 B. Conjugate base to acid ratio is 1.66:1 C. Conjugate base to acid ratio is 1:10 D. Conjugate base to

Citric acid (H3C6H5O7) is a weak triprotic acid with pKa1 = 3.13, pKa2 = 4.77, and pKa3 = 6.40. Which of the following combinations of conjugate acid and base would be most appropriate as a buffer whose purpose is to maintain the pH around 5.8? A) Na2HC6H5O7 and Na3C6H5O7 B) NaH2C6H5O7 and Na2HC6H5O7 C) H3C6H5O7