Question 1

Identify the following as a physical or chemical change: Bacteria convert milk to yogurt.

Accepted Answer

The answer of Identify the following as a physical or...

Question 2

Define element.

Accepted Answer

An element is a subs

Question 3

What is the volume of a 2.5 g block of metal if its density is 4.75 g/cm3?

Accepted Answer

A) 0.53 cm3 
B) 1.9 cm3 
C) 2.5 cm3 
D) 4.75 cm3 
E) 11.9 cm3 
A) 0.53 cm3 
B) 1.9 cm3 
C) 2.5 cm3 
D) 4.75 cm3 
E) 11.9 cm3

Question 4

The "escape velocity" from Earth (the speed required to escape Earth's gravity)is 2.5 * 104 miles per hour.What is this speed in m/s? (1 mile = 1609 m)

Accepted Answer

A) 4.2 * 10-3 m/s 
B) 6.9 m/s 
C) 4.2 * 102 m/s 
D) 1.1 * 104 m/s 
E) 4.0 * 107 m/s 
A) 4.2 * 10-3 m/s 
B) 6.9 m/s 
C) 4.2 * 102 m/s 
D) 1.1 * 104 m/s 
E) 4.0 * 107 m/s

Question 5

When 7.02$\circ$C is converted to the Fahrenheit scale, how many significant figures are there in the $\circ$F result?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 5 
A) 1 
B) 2 
C) 3 
D) 4 
E) 5

Question 6

Which of the following speeds is the greatest? (1 mile = 1609 m)

Accepted Answer

A) 40 mi/h 
B) 2.0 * 105 mm/min 
C) 40 km/h 
D) 0.74 km/min 
E) 400 m/min 
A) 40 mi/h 
B) 2.0 * 105 mm/min 
C) 40 km/h 
D) 0.74 km/min 
E) 400 m/min

Question 7

Which of the following is an example of a physical property?

Accepted Answer

A) corrosiveness of sulfuric acid 
B) toxicity of cyanide 
C) flammability of gasoline 
D) neutralization of stomach acid with an antacid 
E) lead becomes a liquid when heated to 601oC 
A) corrosiveness of sulfuric acid 
B) toxicity of cyanide 
C) flammability of gasoline 
D) neutralization of stomach acid with an antacid 
E) lead becomes a liquid when heated to 601oC

Question 8

How many significant figures does the result of the following sum contain? 8.5201 + 1.93

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 5 
A) 1 
B) 2 
C) 3 
D) 4 
E) 5

Question 9

Classify the following as a mixture, a compound, or an element: Orange juice.

Accepted Answer

The answer of Classify the following as a mixture, a...

Question 10

The volume of a sphere is given by V = (4/3)$\pi$r3 where r is the radius. What is the mass of a magnesium sphere with a radius of 0.80 cm? (The density of magnesium is 1.74 g/cm3.)

Accepted Answer

Question 11

Classify the following as a physical or chemical change: Alcohol evaporates.

Accepted Answer

The answer of Classify the following as a physical or...

Question 12

In 1828, the diameter of the U.S.dime was changed to approximately 18 mm. What is this diameter when expressed in nanometers?

Accepted Answer

A) 1.8 * 109  nm 
B) 1.8 * 107 nm 
C) 1.8 * 101 nm 
D) 1.8 * 10-5 nm 
E) 1.8 * 10-10 nm 
A) 1.8 * 109  nm 
B) 1.8 * 107 nm 
C) 1.8 * 101 nm 
D) 1.8 * 10-5 nm 
E) 1.8 * 10-10 nm

Question 13

Classify the following as either a physical or a chemical property: The vitamin content of foods in contact with air falls.

Accepted Answer

The answer of Classify the following as either a physical...

Question 14

The density of mercury is 13.6 g/cm3. What is the mass in pounds of 1.0 gallons of mercury? (1 lb = 453.6 g; 1 gal = 3.785 L)

Accepted Answer

A) 0.11 lb 
B) 30.lb 
C) 51 lb 
D) 83 lb 
E) 110 lb 
A) 0.11 lb 
B) 30.lb 
C) 51 lb 
D) 83 lb 
E) 110 lb

Question 15

Give an example of an intensive property.

Accepted Answer

(Answers will vary.)

Question 16

Express the fraction 1/51 in scientific notation to 3 significant figures.

Accepted Answer

A) 2 * 10-2.00 
B) 2.0 * 10-2.00 
C) 1.96 * 10-2 
D) 1.97 * 10-2 
E) 2.00 * 10-2 
A) 2 * 10-2.00 
B) 2.0 * 10-2.00 
C) 1.96 * 10-2 
D) 1.97 * 10-2 
E) 2.00 * 10-2

Question 17

Express the fraction 1/23 as a decimal to 4 significant figures.

Accepted Answer

A) 0.0434 
B) 0.0435 
C) 0.04347 
D) 0.04348 
E) 0.04350 
A) 0.0434 
B) 0.0435 
C) 0.04347 
D) 0.04348 
E) 0.04350

Question 18

Which one of the following represents a physical change?

Accepted Answer

A) water, when heated to 100°C, forms steam 
B) bleach turns hair yellow 
C) sugar, when heated, becomes brown 
D) milk turns sour 
E) apples, when exposed to air, turn brown 
A) water, when heated to 100°C, forms steam 
B) bleach turns hair yellow 
C) sugar, when heated, becomes brown 
D) milk turns sour 
E) apples, when exposed to air, turn brown

Question 19

Which of the following does not represent a chemical change?

Accepted Answer

A) a freshly cut apple turns brown 
B) milk turns sour on standing at room temperature 
C) when cooled to 0°C, liquid water becomes ice 
D) frying an egg 
E) fermentation of sugar to alcohol 
A) a freshly cut apple turns brown 
B) milk turns sour on standing at room temperature 
C) when cooled to 0°C, liquid water becomes ice 
D) frying an egg 
E) fermentation of sugar to alcohol

Question 20

A piece of metal with a mass of 611 g is placed into a graduated cylinder that contains 25.1 mL of water, raising the water level to 56.7 mL. What is the density of the metal?

Accepted Answer

A) 2.70 g/cm3 
B) 7.13 g/cm3 
C) 8.96 g/cm3 
D) 10.5 g/cm3 
E) 19.3 g/cm3 
A) 2.70 g/cm3 
B) 7.13 g/cm3 
C) 8.96 g/cm3 
D) 10.5 g/cm3 
E) 19.3 g/cm3

Exam 1: Chemistry: The Study of Change

Identify the following as a physical or chemical change: Bacteria convert milk to yogurt.

Define element.

What is the volume of a 2.5 g block of metal if its density is 4.75 g/cm3?

The "escape velocity" from Earth (the speed required to escape Earth's gravity)is 2.5 * 104 miles per hour.What is this speed in m/s? (1 mile = 1609 m)

When 7.02 ∘\circ∘ C is converted to the Fahrenheit scale, how many significant figures are there in the ∘\circ∘ F result?

Which of the following speeds is the greatest? (1 mile = 1609 m)

Which of the following is an example of a physical property?

How many significant figures does the result of the following sum contain? 8.5201 + 1.93

Classify the following as a mixture, a compound, or an element: Orange juice.

The volume of a sphere is given by V = (4/3) π\piπ r3 where r is the radius. What is the mass of a magnesium sphere with a radius of 0.80 cm? (The density of magnesium is 1.74 g/cm3.)

Classify the following as a physical or chemical change: Alcohol evaporates.

In 1828, the diameter of the U.S.dime was changed to approximately 18 mm. What is this diameter when expressed in nanometers?

Classify the following as either a physical or a chemical property: The vitamin content of foods in contact with air falls.

The density of mercury is 13.6 g/cm3. What is the mass in pounds of 1.0 gallons of mercury? (1 lb = 453.6 g; 1 gal = 3.785 L)

Give an example of an intensive property.

Express the fraction 1/51 in scientific notation to 3 significant figures.

Express the fraction 1/23 as a decimal to 4 significant figures.

Which one of the following represents a physical change?

Which of the following does not represent a chemical change?

A piece of metal with a mass of 611 g is placed into a graduated cylinder that contains 25.1 mL of water, raising the water level to 56.7 mL. What is the density of the metal?

Atoms, Molecules, and Ions

Mass Relationships in Chemical Reactions

Reactions in Aqueous Solution

Gases

Thermo-Chemistry

Quantum Theory and the Electronic Structure of Atoms

Periodic Relationships Among the Elements

Chemical Bonding I: Basic Concepts

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Chemistry in the Atmosphere

Entropy, Free Energy, and Equilibrium

Electrochemistry

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Transition Metal Chemistry and Coordination Compounds

Nuclear Chemistry

Organic Chemistry

Synthetic and Natural Organic Polymers

Filters

What is the volume of a 2.5 g block of metal if its density is 4.75 g/cm³?

The "escape velocity" from Earth (the speed required to escape Earth's gravity)is 2.5 * 10⁴ miles per hour.What is this speed in m/s? (1 mile = 1609 m)

When 7.02^$\circ$C is converted to the Fahrenheit scale, how many significant figures are there in the ^$\circ$F result?

The volume of a sphere is given by V = (4/3) $\pi$ r³ where r is the radius. What is the mass of a magnesium sphere with a radius of 0.80 cm? (The density of magnesium is 1.74 g/cm³.)

The density of mercury is 13.6 g/cm³. What is the mass in pounds of 1.0 gallons of mercury? (1 lb = 453.6 g; 1 gal = 3.785 L)