Chemistry 1P Final Pt 1

The SI units of density are kg/m³. How many g/cm³ (a more commonly used density unit) are in 1 kg/m³?

0.001

You were given a dose of 500 mg rather than 500 μg of a drug. How much more of the drug did you receive?

1,000 times more

How many significant figures does the number 67,200 have?

3

Determine the number of moles in 3.00 x 10²¹ atoms of calcium. (The mass of one mole of calcium is 40.08 g.)

4.98 x 10⁻³ moles

A rectangular bar of an unknown metal has a height of 1.3 inches and a width of 2.1 inches. The mass of the piece of metal was found on an analytical scale to be 30.4571 grams. When the piece of metal was dropped into a graduated cylinder that had an initial volume reading of 6.45 cm³, the volume increased to 9.90 cm³. What is the density of the piece of metal?

8.83 g/cm³

How many significant figures does the number 23.070 have? A) 3 B) 4 C) 5 D) 2

c) 5

Perform this mathematical operation and express the answer to the correct number of significant figures: 0.085631 × 1.32 A) 0.113 B) 0.1130 C) 1.41 D) 1.406

A) 0.113

How many moles are in 56.97 grams of RbF? A) 0.5453 mol B) 56.97 mol C) 5952 moles D) 0.9748 mol

A) 0.5453 mol

Which of the following contains the most moles of atoms? A) 1 g of helium B) 1 g of carbon C) 1 g of uranium D) All contain equal number of atoms E) Not enough information

A) 1 g of helium ∆

What is the mass of one mole of carbon atoms? A) 12.01 g B) 1.66 x 10⁻²⁴ g C) 6.022 x 10²³ g D) 6 g

A) 12.01 g

Determine the number of moles in 50.0 grams of sodium. (The mass of one mole of sodium is 22.99 g.) A) 2.17 moles B) 50.0 moles C) 1.31 x 10²⁴ moles D) 6.02 x 10²³ moles E) 3.61 x 10⁻²⁴ moles

A) 2.17 moles

Convert 12.34 inches to meters. (2.54 cm = 1 inch) A) 3.134 x 10⁻¹ m B) 3.134 x 10¹ m C) 1.234 x 10¹ m D) 3.134 x 10³ m E) 4.86 x 10² m

A) 3.134 x 10⁻¹ m

Determine the number of atoms of O in 35.79 grams of C₆H₁₂O₆. A) 7.173 x 10²³ atoms B) 0.1986 atoms C) 1.192 atoms D) 1.29 x 10²⁶ atoms

A) 7.173 x 10²³ atoms

Convert 75.4 kilometers to centimeters. A) 7.54 x 10⁶ cm B) 7.54 x 10⁵ cm C) 7.54 x 10³ cm D) 75.4 cm E) 7.54 x 10⁻³ cm

A) 7.54 x 10⁶ cm

Which of these scenarios contains an exact number? A) You count 10 people in a room. B) You weigh an apple to be 10 grams. C) You measure the tree to be 10 meters high. D) You determine the volume of the pool to be 10 liters.

A) You count 10 people in a room.

How much money will it cost you to drive 124 miles if your car gets 25.7 miles per gallon and gas costs $2.30/gallon? A) $0.48 B) $11.10 C) $2.10 D) $1386

B) $11.10

How many moles of Ag are in 43.58 grams of Ag₂O? A) 0.1880 mol B) 0.3760 mol C) 10.64 mol D) 231.8 mol

B) 0.3760 mol

Perform this mathematical operation and express the answer to the correct number of significant figures: 1.285 x 10⁻² - 1.24 x 10⁻³ A) 0.01161 B) 1.16 x 10⁻² C) 1.16 x 10² D) 1.59 x 10⁻⁵

B) 1.16 x 10⁻²

Determine the number of molecules in 13.6 grams of CO₂. A) 2.25 x 10⁻²³ molecules B) 1.86 x 10²³ molecules C) 8.19 x 10²⁴ molecules D) 0.309 molecules

B) 1.86 x 10²³ molecules

Which one of the following contains the most moles of hydrogen atoms? A) 5 mol of C₂H₆ B) 10 mol CH₃OH C) 15 mol H₂ D) 7 mol C₂H₄

B) 10 mol CH₃OH ∆

A chemist is trying to identify an unknown metal and finds that 25.0 cm³ of the substance has a mass of 224.43 g at 20°C. Which of the following metals is it? A) Aluminum, d = 2.70 g/cm³ B) Iron, d = 7.87 g/cm³ C) Copper, d = 8.98 g/cm³ D) Silver, d = 10.5 g/cm³ E) Gold, d = 19.32 g/cm³

C) Copper, d = 8.98 g/cm³

Convert 113.4 gallons to deciliters. (3.754 liters = 1 gallon) A) 4.257 x 10⁻² dL B) 4.257 x 10² dL C) 1.134 x 10³ dL D) 4.257 x 10³ dL E) 3.02 x 10² dL

D) 4.257 x 10³ dL

An irregularly-shaped piece of aluminum (Al) has a mass of 12.6 grams. What is the volume of this piece of aluminum if its density is 2.70 g/cm³? A) 34.02 cm³ B) 0.214 cm³ C) 15.3 cm³ D) 4.67 cm³

D) 4.67 cm³

Which of the following contains the highest number of atoms? A) 1 mole of helium B) 1 mole of carbon C) 1 mole of uranium D) All contain an equal number of atoms E) Not enough info

D) All contain an equal number of atoms

Calculate the mass, in grams, of 15 atoms of iron if Fe has an atomic weight of 55.85 amu. A) 55.85 g B) 6.022 x 10²³ g C) 2.492 x 10⁻²³ g D) 5.043 x 10²⁶ g E) 1.392 x 10⁻²¹ g

E) 1.392 x 10⁻²¹ g

Determine the number of atoms of O in 92.3 moles of Cr₃(PO₄)₂. A) 5.56 x 10²⁵ atoms B) 1.23 x 10⁻²¹ atoms C) 4.45 x 10²⁶ atoms D) 738.9 atoms

C) 4.45 x 10²⁶ atoms

How many significant figures does the number 0.054901 have? A) 3 B) 4 C) 5 D) 6 E) 7

C) 5

Express the number 554,780,000,040 in scientific notation to three significant figures. A) 5.54 x 10¹¹ B) 5.55 x 10¹² C) 5.55 x 10¹¹ D) 5.548 x 10¹²

C) 5.55 x 10¹¹

How many miles can you drive, if your car gets 25.7 miles per gallon and you have a 12 gallon tank? A) 2.1 miles B) 13.7 miles C) 308 miles D) 470 miles

C) 308 miles

Perform this mathematical operation and express the answer to the correct number of significant figures: 185,007 ÷ 5301 A) 181,500 B) 181,506 C) 34.90 D) 34.9

C) 34.90

How many significant figures does the number 1.006 x 10⁷ have? A) 3 B) 4 C) 5 D) 6 E) 8

B) 4

How many significant figures would this calculation have if it were completed: (9.04 - 8.23 + 21.954 + 81.0) × 3.1416 A) 3 B) 4 C) 5 D) 6

B) 4

How many grams are in 1 molecule of I₂? A) 1.661 x 10⁻²⁴ g B) 4.214 x 10⁻²² g C) 2.108 x 10⁻²² g D) 1.528 x 10²⁶ g

B) 4.214 x 10⁻²² g

According to Wikipedia, the fastest pitch ever thown in Major League Baseball was by Aroldis Chapman and had a velocity of 105.1 miles/hour. How many seconds did it take this pitch to travel the 60 feet and 6 inches from the pitcher's mound to home plate? (1 mile = 5280 feet) A) 1.20 sec B) 0.576 sec C) 0.392 sec D) 0.0314 sec

C) 0.392 sec ∆

How many milliliters are in a liter? A) 10 B) 100 C) 1,000 D) 10,000 E) 1,000,000

C) 1,000

How many grams are in 2.87 x 10²⁵ molecules of CO? A) 47.7 g B) 1.70 g C) 1330 g D) 8.03 x 10²⁴ g

C) 1330 g

How many grams of NaCl are in 23.4 moles of NaCl? A) 23.4 g B) 58.44 g C) 1370 g D) 0.400 g

C) 1370 g

Which one of the following contains the most moles of oxygen atoms? A) 1 mol of Fe(C₂H₃O₂)₃ B) 1 mol of Na₃PO₄ C) 2 mols of Ca(NO₂)₂ D) 3 mol of CH₃OH

C) 2 mols of Ca(NO₂)₂ ∆

Convert 25.76 milligrams to megagrams. A) 2.576 x 10⁻² Mg B) 25.76 Mg C) 2.576 x 10⁻⁸ Mg D) 2.576 x 10² Mg E) 2.576 x 10⁴ Mg

C) 2.576 x 10⁻⁸ Mg

Determine the number of atoms in 10.0 grams of sodium. (The mass of one mole of sodium is 22.99 g.) A) 0.435 atoms B) 10.0 atoms C) 2.62 x 10²³ atoms D) 6.02 x 10²³ atoms E) 7.22 x 10⁻²⁵ atoms

C) 2.62 x 10²³ atoms

Determine the mass in grams of 3.00 x 10²¹ atoms of arsenic. (The mass of one mole of arsenic is 74.92 g.) A) 4.00 x 10¹⁹ g B) 4.98 x 10⁻³ g C) 6.02 x 10²³ g D) 0.373 g E) 6.65 x 10⁻⁵ g

D) 0.373 g

Determine the number of moles in 3.00 x 10²³ formula units of CaCl₂. A) 55.3 mol B) 1.81 x 10⁴⁷ mol C) 2.00 mol D) 0.498 mol

D) 0.498 mol

How many molecules are in 25.8 moles of CO₂? A) 4.28 x 10⁻²³ molecules B) 3.53 x 10²³ molecules C) 6.84 x 10²⁶ molecules D) 1.55 x 10²⁵ molecules

D) 1.55 x 10²⁵ molecules

A researcher is able to isolate 1 g of an unknown compound. How many molecules of the compound has she isolated? A) 6.022×10²³ B) 2×(6.022×10²³) C) 0.5(6.022×10²³) D) 10(6.022×10²³) E) Not enough information

E) Not enough information