Chemistry Answers

Solid lime (CaO) reacts with chlorine gas (Cl₂) to form laundry bleach (CaOCl₂). Calculate how many moles of chlorine gas is required to produce 1.000 kg of laundry bleach.

Titration of 0.2121 g of pure Na2C2O4 (134.00 g/mol) required 43.31 mL

of KMnO4.What is the molar concentration of the KMnO4 solution? The

chemical reaction is

2MnO4 + 5C2O4+ 16H* ->2Mn+ 10CO2+ 8H2O

The bond energy of F₂ is unusually low, in comparison with the other halogens, due to the small size of the fluorine atom. Which of the following periodic properties is also unusually low in the case of fluorine?

if 3.00 grams of H₂ were produced, how many grams of Al reacted?

1. Calculate the pH of the original buffer solution of dihydrogen phosphate/hydrogen phosphate.

2. Calculate the pH The 20 mL (dihydrogen phosphate/hydrogen phosphate buffer) solution when 1 mL of 0.1 molL-1 NaOH has been added

3. Calculate the pH of the 20 mL (dihydrogen phosphate/hydrogen phosphate buffer) solution when 1 mL of 0.1 molL-1 HCl has been added

- Using the Henderson formula for the pH of a solution: pH = pKa + log ([A-]/ [HA]), and show working out

For each of the following molecules, write the Lewis structure(s), predict the molecular structure (including bond angles), give expected hybrid orbitals on the central atom, and predict the overall polarity.

a. OF2 b. AsF5 c. IF5

6.) 10.1 how many significant figures?

a. 3

b. 2

c. 1

7.) 0.0004 how many significant figures?

a. 4 b. 3 c. 1

8.) 1 cm converts into m

a. 10mm b. 100mm c.1000mm

9.) 100 cm converts into m

a. 1m b.10m c.0.1m

10.) 1km to m

a. 10m b. 100m c. 1000m

11.) 1000 grams to kilogram

a. 0.1kg b. 10kg c. 1kg

12.) 1L to ml

a. 10ml b. 100ml c.1000ml

Matching Type:

A.

1.) 3.005 g

2.) 820 m

3.) 0.000 670 km

4.) 0.405 021 kg

5.) 22.4 L

B.

a. 4 significant figures

b. 2 significant figures

c. 3 significant figures

d. 6 significant figures

e. 3 significant figures

1.) 300 convert into scientific notation

a. 3x10^2

b. 3.00x10^1

c. 3.00x10

2.) 4x10^3 convert into ordinary decimal notation

a. 4000

b. 400

c. 40 000

3.) 48,923 how many significant figures?

a. 5

b. 4

c. 3

4.) 900.06 how many significant figures?

a. 5

b. 4

c. 3

5.) 3,000,000 how many significant figures?

a. 1

b. 7

c. 6

Convert the measuring units as indicated.

1.) 2.25 gal=__________qt

2.) 4.453 km=_________

3.) 103 in=_________ft

4.) 42 oz=_________gal

5.) 1.3 T=_________Ib

6.) 5078 m=_________km

1.) 52140 ft=__________mi

2.) 24 oz=__________qt

3.) 3 pt=___________ c

4.) 3.5 qt=__________oz

5.) 10300 lb=_________T

1.) 1.336 gal=_________ oz

2.) 5 c=__________ oz

3.) 72 oz=_________qt

4.) 5.8 T=__________ lb

5.) 2.25 lb=__________ oz

6.) 0.875 qt=__________ oz

Convert each of the following into scientific notation.

1. 3427

2. 172

3. 3100.0x10²

4. 0.0000455

5. 0.982 x 10-³

6. 3.03x10-¹

7. 0.00565

8. 1000x10-³

9. 0.00456

10.0.000984

Determine the number of the significant figures in each of the following.

1. 3427

2. 172

3. 3100.0x10²

4. 0.0000455

5. 0.982 x 10-³

6. 3.03x10-¹

7. 0.00565

8. 1000x10-³

9. 0.00456

10.0.000984