Sem 2 Review Part 1

Balancing

Data Analysis

Moles

Stoich

100

What are the five types of chemical reactions?

Synthesis

Decomposition

Single replacement

Double replacement

Combustion

100

How many milliliters are in 6.50 liters?

6.50 x 1000 = 6500

100

How many moles are in 525 g of calcium?

525 grams x (1 mole / ~40 grams) = 13.1 moles

100

How many moles of carbon dioxide are produced when 10.0 moles of C₃H₈is burned with oxygen gas? **NOT BALANCED**

__C₃H₈ + __O₂ --> __CO₂ + __H₂O

C₃H₈ + 5O₂ --> 3CO₂ + 4H₂O

10 mol C₃H₈x (3 mol CO₂ / 1 mol C₃H₈)

= 30 mol CO₂

200

In a combustion reaction, what are the two products always produced?

Carbon dioxide and water

200

How many kilocalories are in 1600 calorie?

1600 / 1000 = 1.6

200

How many grams are in 0.0450 mol of Cr?

0.0450 mole x (52.00 grams / 1 mole) = 2.34 grams

200

Determine the mass of sodium chloride produced when 1.25 mol of chlorine gas reacts with sodium.

2Na + Cl₂ --> 2NaCl

1.25 mol Cl x (2 mol NaCl / 1 mol Cl) x (~58 g NaCl / 1 mol NaCl) = ~145 g NaCl

300

Balance the equation:

NaOH + CaBr₂ --> Ca(OH)₂ + NaBr

2NaOH + CaBr₂ --> Ca(OH)₂ + 2NaBr

300

How many grams are in 7.5 kilograms?

7.5 x 1000 = 7500

300

How many particles are in 11.5 mol of Ag?

11.5 mole x (6.02 x 10²³ particles) = 69.23 x 10²³

= 6.923 x 10²⁴ particles

300

Determine the moles needed of NaOH to react with 500.0 g of H₂SO₄.

H₂SO₄+ 2NaOH --> Na₂SO₄ + 2H₂O

500 g x (1 mole / ~98 grams) x (2 moles NaOH / 1 mole H₂SO₄) = ~10.2 NaOH

400

Write AND balance the following equation:
Carbon disulfide reacts with oxygen gas and produces carbon dioxide and sulfur dioxide

CS₂ + 3O₂ --> CO₂ + 2SO₂

400

How many joules are in 55.2 caloires?

55.2 x 4.184 = 231

400

How many moles are in 4.50 x 10²⁴ atoms of zinc?

4.50 x 10²⁴particles x (1 mole / 6.02 x 10²³ particles) = 0.748 x 10¹

= 7.48 moles

400

Determine the mass of water from the decomposition of 25.0 g of Ammonium Nitrate

NH₄NO₃ --> N₂O + 2H₂O

25 grams x (1 mol / ~80 grams) x (2 mol H₂O / 1 mole NH₄NO₃) x (~18 grams / 1 mole)

= ~11.25 g

500

Write AND balance the following equation:
Iron (III) chloride reacts with sodium hydroxide, producing solid iron (III) hydroxide and sodium chloride

FeCl₃ + 3NaOH --> Fe(OH)₃ + 3NaCl

500

How many kilocalories are in 85,200 joules?

85200 / 4.184 = 20,363 calories

20,363 / 1000 = 20.4

500

How many particles are in 31.1 g of Au?

31.1 grams x (1 mole / ~197 grams) x (6.02 x 10²³ particles / 1 mole) = 0.950 x 10²³

= 9.50 x 10²² particles