Chemistry chapter 3 hw

Which temperature is identical on both the Celsius and Fahrenheit scales?

-40

An unknown metal is suspected to be gold. When 2.8 J of heat is added to 5.6 gg of the metal, its temperature rises by 3.9 ∘C.

0.13J/g∘C

What is the specific heat (J/g∘C) of a metal object whose temperature increases by 3.0∘C when 17.5 g of metal was heated with 38.5 J?

0.73

If 1 lb of fat is stored by the body for each 1.46×104kJ1.46×104kJ of excess nutritional energy consumed, how long will it take this person to gain 1 lb?

10 days

A European doctor reports that you have a fever of 39.7 ∘C∘C. What is your fever in degrees Fahrenheit?

103.5 ∘F

How many grams of water when supplied with 348J of heat will gain a temperature of 5.2∘C?

16

What is the final temperature of 25.0 grams of water at 22.0∘C after it absorbs 379J of heat?

25.6

What is the value of 21∘∘C on the Kelvin scale?

294

Becky is going to take her dog for walk in the park, but before she leaves, she watches the weather report. According to the weather report, it is 84.0 ∘F outside. What is the outside temperature in kelvins?

302 K

What is the value of 98 ∘∘F in units of ∘∘C?

37

What is the value of 15∘∘C on the Fahrenheit scale?

59

What is the value of 333 K in units of ∘∘C?

60

Convert 21.0 ∘C to degrees Fahrenheit.

69.8 F

A runner burns 3.74×103kJ during a five-mile run. How many nutritional Calories did the runner burn?

894 Cal

How many joules does it use? 1kWh=3.60×106J

9.4×10^7

Given the table of specific heat values below, what is the identity of a 10.0 g metal sample that increases by 14.0∘∘C when 17.9J17.9J of energy is absorbed?

Au

The specific heat capacity of substance A is twice that of substance B. If samples of equal mass of the two substances absorb the same amount of heat, which substance undergoes the larger change in temperature?

Substance B

Which process is endothermic?

The melting of ice in soft drink

Is the reaction between the iron and oxygen exothermic or endothermic?

exothermic