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What is the formula mass for diboron tetrachloride

10/11/2021 Client: muhammad11 Deadline: 2 Day

CHEM 1025 Homework # 2 Name: Chapters 4 & 5 Professor Yahaira Reyes Due: Thursday, 16th, June, 2016

You must show ALL calculations of answers attained to receive credit. Any form of cheating or

copying will result in a zero grade on the assignment for all students involved. Please utilize periodic

table located on BB for all problems where applicable. You must include the cover sheet located at the end of this assignment. You must box your final answers; work must be legible.

1. Complete the following table. (0.5 ea.)

Symbol Protons Neutrons Electrons Charge

4 6 0

𝑇𝑖22 34 2+

𝑆16 33 2-

π‘π‘Ž11 22 +

2. Determine whether the following elements are metals, nonmetals, or metalloids. Please circle the

correct answer. (0.25 ea.)

a. Pd Metal Nonmetal Metalloid

b. Si Metal Nonmetal Metalloid

c. Te Metal Nonmetal Metalloid

d. Kr Metal Nonmetal Metalloid

3. (1pt) The horizontal rows of the periodic table are called _____________________.

4. An element has two naturally occurring isotopes. One has an abundance of 37.40% and an isotopic mass of 184.953 amu, and the other has an abundance of 62.60% and a mass of 186.956 amu. What is the atomic

weight of the element? (2 pts)

5. The element antimony has only two naturally-occurring isotopes. One isotope has an abundance of 57.30% and an isotopic mass of 120.904 amu. The other has an abundance of 42.70% and an isotopic mass of

122.853 amu. Based on this data, what is the atomic weight of antimony? (2 pts)

6. Label which group on the periodic table the following elements belong. [Families: alkali metals, alkaline earth metals, transition metals, halogens, or noble gases]. (0.25 ea.)

Family

a. I _______________________

b. Li _______________________

c. Co _______________________

d. Rn _______________________

7. Name the following ionic compounds that contain metals that can only form one charge: (1 pt ea)

a. NaF __________________________________________

b. MgCl2 __________________________________________

c. Mg(OH)2 __________________________________________

d. Ag2O __________________________________________

8. Write a formula for the ionic compound that forms between each pair of elements: (1 pt ea.)

a. barium and oxygen _____________________________________

b. beryllium and chlorine _____________________________________

c. magnesium and sulfur _____________________________________

d. strontium and bromine _____________________________________

9. Name each ionic compound: (1 pt ea.)

a. NH4I _____________________________________ b. NaClO2 _____________________________________ c. Pb(C2H3O2)2 _____________________________________ d. KClO3 _____________________________________

10. Write a formula for the compound that forms between barium and each polyatomic ion: (1 pt ea.)

a. hydroxide

b. chromate

c. phosphate

d. cyanide

11. Determine the name from the formula: (1 pt ea.)

a. iridium(III) bromide

b. potassium carbonate

c. cobalt(II) phosphate

d. copper(I) chloride

12. Name the following molecular compounds: (1 pt ea.)

a. NF __________________________________________

b. N3Cl2 __________________________________________

c. XeO3 __________________________________________

d. CCl4 __________________________________________

13. Write a formula for each molecular compound: (1 pt ea.)

a. phosphorus trichloride __________________________________

b. chlorine monoxide __________________________________

c. disulfur tetrafluoride __________________________________

d. diphosphorus pentasulfide __________________________________

14. Write the formula for each acid: (1 pt ea.)

a. hydrofluoric acid __________________________________

b. carbonic acid __________________________________

c. sulfurous acid __________________________________

d. hydrocyanic acid ` __________________________________

15. What is the formula mass for diboron tetrachloride? (2 pts)

16. What is the formula mass of copper (II) fluoride? (2 pts)

Answers

Please use this space and any other sheets necessary for answers.

CHEM 1025 Homework # 2 Name: Chapters 4 & 5 Professor Yahaira Reyes Due: Thursday, 16th, June, 2016

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