Chem 1405 Final
CHEM 1405 Name:_____________________
Exam # 1 (Chap. 1- 3) Score:
PART I – Multiple choice : (3 points each)
-------1. What is the term for the study of the composition and properties of matter? a. geology b. chemistry c. alchemy d. physics
-------2. Express 10,000 as a power of 10. a. 103 b. 10-5 c. 104 d. 105
-------3. How many significant digits are in 0.0250 cm3? a. 5 b. 2 c. 3 d. 4
-------4. Which of the following unit equations is not correct? a. 20 dollars = 1 nickel b. 5 nickels = 1 quarter c. 5 pennies = 1 nickel d. 4 quarters = 1 dollar
-------5. Round off the measurement 968.543m to three …show more content…
968 m b. 9682.543 m c. 9680 m d. 9700 m
------6. A 4.500 g sample of silver-containing ore was analyzed and found to contain 1.268 g of pure silver. What is the percentage by mass of pure silver in the ore? a. 28.18% b. 5.768% c. 5.768% d. 28.2%
-------7. Which statement about mass measurement is true? a. Mass is measured using a balance and is not affected by Earth's …show more content…
If the temperature outside is 00 F. Express this temperature in 0 C.
3.a. A 4.500 g sample of silver-containing ore was analyzed and found to contain 1.28g of pure silver. What is the percentage by mass of pure silver in the ore?
b. What is the density of an object that has a mass of 14.53 g and occupies a of volume of 5.63 mL?
4.a Metal tiles are decorative alternatives to ceramic and porcelain tiles. A rectangular tile of solid copper measures 30.5 cm long and 7.5 cm wide. If the tile’s volume is 115.0 cm3, what is the thickness of the tile?
b. The density of aluminum is 2.70 g/cm3 . If a piece of aluminum foil has a mass of 6.39 g, then what is its volume in cm3?
5. a. The speed of light is 3.00 x 108 m/s. What is the speed expressed in kilometers per hour?
b. The radius of tin atom is 1.41 x 10-8 cm. What is the radius of the atom in nanometers?
Bonus: Answer only one question (10 points)
6. A kettle containing 0.900 liters of water was heated from 20.0 0C to 100.0 0C. How much electrical energy, in kilojoules, was required to achieve this?
Part II:
Exam # 1 (Chap. 1- 3) Score:
PART I – Multiple choice : (3 points each)
-------1. What is the term for the study of the composition and properties of matter? a. geology b. chemistry c. alchemy d. physics
-------2. Express 10,000 as a power of 10. a. 103 b. 10-5 c. 104 d. 105
-------3. How many significant digits are in 0.0250 cm3? a. 5 b. 2 c. 3 d. 4
-------4. Which of the following unit equations is not correct? a. 20 dollars = 1 nickel b. 5 nickels = 1 quarter c. 5 pennies = 1 nickel d. 4 quarters = 1 dollar
-------5. Round off the measurement 968.543m to three …show more content…
968 m b. 9682.543 m c. 9680 m d. 9700 m
------6. A 4.500 g sample of silver-containing ore was analyzed and found to contain 1.268 g of pure silver. What is the percentage by mass of pure silver in the ore? a. 28.18% b. 5.768% c. 5.768% d. 28.2%
-------7. Which statement about mass measurement is true? a. Mass is measured using a balance and is not affected by Earth's …show more content…
If the temperature outside is 00 F. Express this temperature in 0 C.
3.a. A 4.500 g sample of silver-containing ore was analyzed and found to contain 1.28g of pure silver. What is the percentage by mass of pure silver in the ore?
b. What is the density of an object that has a mass of 14.53 g and occupies a of volume of 5.63 mL?
4.a Metal tiles are decorative alternatives to ceramic and porcelain tiles. A rectangular tile of solid copper measures 30.5 cm long and 7.5 cm wide. If the tile’s volume is 115.0 cm3, what is the thickness of the tile?
b. The density of aluminum is 2.70 g/cm3 . If a piece of aluminum foil has a mass of 6.39 g, then what is its volume in cm3?
5. a. The speed of light is 3.00 x 108 m/s. What is the speed expressed in kilometers per hour?
b. The radius of tin atom is 1.41 x 10-8 cm. What is the radius of the atom in nanometers?
Bonus: Answer only one question (10 points)
6. A kettle containing 0.900 liters of water was heated from 20.0 0C to 100.0 0C. How much electrical energy, in kilojoules, was required to achieve this?
Part II: