37 terms

Chap 2 - Inorganic Chemistry

STUDY
PLAY
Classify each of the following as a pure substance or a mixture:
a soft drink
a cheese sandwich
salt substitute (KCl)
propane (C3H8)
an iron (Fe) nail
Pure Substance
An iron Nail
propane
salt substitute

Mixture
A soft Drink
A cheese sandwich
What type of change, physical or chemical, takes place in each of the following?
Water vapor condenses to form rain.
Cesium metal reacts explosively with water.
Gold melts at 1064 degrees Celsius.
A puzzle is cut into 1000 pieces.
Sugar dissolves in water.
Physical Change
A puzzle is cut into 1000 pieces.
Water vapor condenses to form rain.
Sugar dissolves in water.
Gold melts at 1064 degrees Celsius

Chemical Change
Cesium metal reacts explosively with water.
Rank the following species according to the decreasing energy needed to raise the temperature of 10.0 g of the substance by 25.0 ∘C.
Rank from most to least energy needed
More Energy Needed
water
aluminum
cast iron
Copper
Silver
If you pour equal amounts of scalding hot water into different metallic cups of equal temperature, which cup will heat up the most? Rank the cups from hottest to coldest.
Warmest
500-g Silver Cup
500-g Aluminum Cup
750-g Aluminum Cup
Coolest
How much heat energy is required to raise the temperature of 0.364kg of copper from 23.0 ∘C to 60.0 ∘C? The specific heat of copper is 0.0920 cal/(g⋅∘C) .
1240 cal
If 125 cal of heat is applied to a 60.0-g piece of copper at 25.0∘C , what will the final temperature be? The specific heat of copper is 0.0920 cal/(g⋅∘C) .
47.6 ∘C
Alexandra decides to climb Mt. Krumpett, which is 5000 m high. She determines that this will require a total of 1800kcal of energy for the trip. For her food supply, she decides to take nutrition bars. The label states that each bar contains 50 g of carbohydrates, 10 g of fat, and 40 g of protein.

How many nutrition bars should Alexandra pack?
4 bars
A 70.0-kg person has just eaten a quarter-pound cheeseburger (31 g of proteins, 29 g of fats, 34 g of carbohydrates), french fries (3 g of proteins, 11 g of fats, 26 g of carbohydrates), and a chocolate shake (11 g of proteins, 9 g of fats, 60 g of carbohydrates). For the person in the problem, use the table to determine each of the following:


The number of hours of sleeping needed to "burn off" the kilocalories in this meal.
18 hours
The number of hours of running needed to "burn off" the kilocalories in this meal.
1.5 hours
Dry ice in an ice-cream cart disappears.
sublimation
Snow on the ground turns to liquid water.
melting
Heat is removed from 125 g of liquid water at 0∘C.
freezing
In a warm room, a person's glasses fog up.
condensation
Calculate the heat in calories needed to freeze 65g of water at 0 ∘C.
Express your answer to two significant figures and include the appropriate units.
5200 cal
Indicate whether heat was absorbed or released in situation above.
released
Calculate the heat in joules needed to freeze 235g of water at 0 ∘C.
Express your answer to three significant figures and include the appropriate units.
7.85×10^4 J
Indicate whether heat was absorbed or released in situation above.
released
Calculate the heat in kilocalories needed to melt 180g of ice at 0 ∘C.
Express your answer to two significant figures and include the appropriate units.
14 kcal
Indicate whether heat was absorbed or released in situation above.
absorbed
Calculate the heat in kilojoules needed to melt 3.00kg of ice at 0 ∘C.
Express your answer to three significant figures and include the appropriate units.
1000 kJ
Indicate whether heat was absorbed or released in situation above.
absorbed
Calculate the heat in calories needed to condense 11.0g of steam at 100∘C.
Express your answer to three significant figures and include the appropriate units.
5940 cal
Indicate whether heat was absorbed or released in situation above.
released
Calculate the heat in joules needed to condense 7.90g of steam at 100∘C.
Express your answer to three significant figures and include the appropriate units.
1.79×10^4 J
Indicate whether heat was absorbed or released in situation above.
released
Calculate the heat in kilocalories needed to vaporize 48g of water at 100∘C.
Express your answer to two significant figures and include the appropriate units.
26 kcal
Indicate whether heat was absorbed or released in situation above.
absorbed
Calculate the heat in kilojoules needed to vaporize 9.00kg of water at 100∘C.
Express your answer to three significant figures and include the appropriate units.
2.03×10^4 kJ
Indicate whether heat was absorbed or released in situation above.
absorbed
Which of the following is a physical change?
digesting a hamburger
burning gas in a car
silver jewelry tarnishes
melting snow
Melting Snow
Indicate whether each statement describes potential or kinetic energy.
Potential Energy
the energy in your food
a tightly wound spring

Kinetic energy
A car speeding down the freeway
an earthquake
A person uses 820kcal on a long walk. Calculate the energy used for the walk in joules.
Express your answer to two significant figures and include the appropriate units.
3.4×10^6 J
A person uses 820kcal on a long walk. Calculate the energy used for the walk in kilojoules.
Express your answer to two significant figures and include the appropriate units.
3400 kJ
Hot compresses for a patient are prepared with water heated to 145 ∘F. What is the temperature of the hot water in degrees Celsius?
Express your answer with the appropriate units.
62.8 ∘C
During extreme hypothermia, a boy's temperature dropped to 20.6 ∘C. What was his temperature on the Fahrenheit scale?
Express your answer with the appropriate units.
69.1 ∘F
The highest recorded temperature in the continental United States was 134 ∘F in Death Valley, California, on July 10, 1913.
Express your answer with the appropriate units.
56.7 ∘C
The lowest recorded temperature in the continental United States was -69.7 ∘F in Rodgers Pass, Montana, January 20, 1954.
Express your answer with the appropriate units.
-56.5 ∘C
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