Exam 1 Fall 11 CHM 2045 final version Form A w out ans -...

Exam 1 Fall 11 CHM 2045 final version Form A w out ans
Download Document
Showing pages : 1 of 2
This preview has blurred sections. Sign up to view the full version! View Full Document
CHM 2045 Exam 1 (Gower, Mitchell, Williams) (Form Code A) Fall 2011 Instructions: This exam contains 25 questions worth 10 points each. On your Scantron form enter and bubble in your name , UF ID number (start on the leftmost space and leave any extra spaces blank), and Form Code (see above). You may retain your exam sheet (mark your answers on it and the Scantron) and any other sheets. Turn in only your Scantron. Check your bubbling carefully – minus 9 points for bubbling errors, non-negotiable . 1. If you mix 250. mL 1.0 M KCl with 375. mL 2.5 M KCl, what is the molarity of KCl in the final solution? (1) 0.4 M (2) 1.9 M (3) 1.2 M (4) 1.6 M (5) 2.4 M 2. Which choice(s) contain(s) both ionic and covalent bonds? I. H 3 O + II. Mg(OH) 2 III. SF 6 IV. Na 2 O V. K 2 CO 3 (1) I only (2) I & II only (3) I & III only (4) II & V only (5) I & V only 3. Which choice is correctly classified ? (1) chromium, main group element (2) ammonia, ionic compound (3) xenon, monatomic gas (4) hydride, polyatomic anion (5) butane, homogeneous mixture 4. A mixture of copper(II) sulfate pentahydrate (249.70 g/mol) and magnesium sulfate heptahydrate (246.49 g/mol) is heated until all the water is lost. The weight of the initial mixture is 5.020 g, and the weight of the resulting anydrous compounds is 2.988 g. Which choice is closest to the percent by mass of copper(II) sulfate pentahydrate in the original mixture? (1) 40.48% (2) 50.32% (3) 59.52% (4) 53.54% (5) 70.86% 5. A 500. mL sample of 2.00 M HCl solution is treated with 4.47 g of magnesium. Calculate the concentration of the acid solution after all the metal has reacted. Assume that the volume remains unchanged. (The products of this reaction are magnesium chloride and hydrogen gas.) (1) 1.63 M (2) 1.26 M (3) 0.632 M (4) 0.368 M (5) 0.184 M 6. Consider the reaction MnO 2 (s) + 4HCl(aq) MnCl 2 (aq) + Cl 2 (g) + 2H 2 O( l ). If 74.8 g MnO
Background image of page 1
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Create a FREE account now to get started. Log In

The email address you entered is not valid. The email address you provided is already in use.
Your username must be at least 5 characters. Your username must consist of only alphanumeric characters. Your username must contain at least one letter. Your username contains inappropriate language. Another user has already claimed this username.
Your password must be at least 6 characters in length.
{[ $select.selected.label ]} Please select a valid school.
By creating an account you agree to our Privacy Policy, Terms of Use, and Honor Code.
Create my FREE account Processing...
Sign Up with Facebook

We will never post anything without your permission.

Already on Course Hero? Log In