Complete the following questions and Must show work on everything

#1

1. Define physical change and chemical change:

State which type of change occurs in each of the following:

A. Passing an electric current through molten magnesium, chloride yields molten magnesium and gaseous chloride.

B. Dew condensing on a leaf.

C. The iron in discarded automobiles slowly forms reddish brown, crumby rust.

D. A spoonful of batter cooking on a hot griddle.

2. Describe the essential features of the scientific model:

3. Describe the difference between intensive and extensive properties.

Which of the following properties are intensive:

A. Mass

B. Density

C. Volume

D. Melting point

4. Explain the difference between heat and temperature. Does 1L of water at 65 F have more, less, or the same quantity of energy as 1L of water at 65 C? Explain your answer.

5. At 25.0 oC, one milliliter of mercury has a mass of 13.6 grams. How many liters of mercury are required to have a mass of 500. kg of mercury?

6. The freezing point of the noble gas, argon, is –308°F. What is this temperature in kelvins?

7. Carry out the following calculations and make sure to report the answer to the correct number of significant digits and units.

A. (2.420 g + 15.6 g) / 4.8 g

B. 7.87 mL / (16.1 mL – 8.44 mL)

C. V = r2h r = 6.23 cm and h = 46.30 mm

8. Express each of the following in the desired units:

A. .0987 Gm in nm.

B. 487 Mm/day in ft/sec

C. 987 g/nL in Kg/L

9. If 5.76 x 1013 neon atoms (spherical) were laid in a line, each touching the next, the line would measure 2.54 miles. What is the diameter of a neon atom in nm?

10. Brass is an alloy of copper and zinc. Varying he mass percentages of the two metals produces brasses with different properties. A brass called yellow zinc has high density and strength. Yellow zinc can vary between 34- 37% zinc by mass.

A. Find the mass range (in g) of copper in 185g of yellow zinc.

B. What is the mass range (in g) of zinc in a sample of yellow zinc that contains 46.5g of copper?

#2

1. Each response below lists the formula for an ion give the name.

   • (a) PO43–

   • (b) CrO42–

   • (c) NO3–

   • (d) Fe2+

   • (e) Br–

2. Write the correct formula for the following compounds.

   • (a) sodium sulfite

   • (b) ammonium fluoride

   • (c) copper(II) carbonate

   • (d) iron(III) chloride

   • (e) mercury(I) nitride

1. Name the following compounds from the formulas below

   • (a) C12H22O11

   • (b) NH3

   • (c) HC2H3O2

   • (d) C3H8

   • (e) N2O5

   • (f) Sn(MnO4)4

2. Write the expanded Chemical Symbol notation for each of the following atoms or ions and explain the number of protons, neutrons, and electrons in each:

• (a) a neutral carbon that has an approximate mass of 14 amu.

• (b) an iron ion that has a charge of +3 and approximate mass of 57 amu.

• (c) a neutral atom that has a total of 30 negative charges outside the nucleus and an approximate mass of 66 amu.

• (d) an ion that has a positive charge of +2 that has 47 positive charges in the nucleus and an approximate mass of 106.

5. A compound of iodine and cesium contains 63.94 g of metal and 61.06 g of nonmetal. How many grams of cesium are in 38.77 g of the compound? How many grams of iodine?

6. Show with calculations, how the following data illustrate the law of multiple proportions:

Compound 1: 77.6 mass % xenon and 22.4 mass % fluorine

Compound 2: 63.3 mass % xenon and 36.7 mass % fluorine

7. The following charges on individual oil droplets were obtained during an experiment similar similar to Millikan’s: -3.204 * 10-19 C; -4.806 * 10-19 C; -8.010 * 10-19 C; -1.442 * 10-18 C Determine a charge for the electron (in C, coulombs), and explain your answer.

8. Even though several elements have only one naturally occurring isotope and all atomic nuclei have whole numbers of protons and neutrons, the atomic mass of only 1 isotope (12C) is a whole number. In addition, the atomic mass of no element (including Carbon) is not a whole number. Explain this.

9. The question has 2 parts:
A. Describe the type and nature of bonding that occurs between two nonmetals.
B. How can ionic compounds be neutral if they consist of positive and negative ions?

10. Copper has 2 naturally occurring isotopes: 63Cu (isotopic mass = 62.9396 amu) and 65Cu (isotopic mass = 64.9278 amu). If copper has and atomic mass of 63.546 amu, what is the percent of each isotope?