Question 1

The combustion of 5.00 g of C₂H₆(g), at constant pressure, releases 259 kJ of heat. Find Δ H for the reaction in kJ\g. 2 C₂H₆(g)+ 7 O₂(g)→ 4 CO₂(g)+ 6 H₂O (l)

Accepted Answer

The heat released per gram is calculated by dividing the total heat released by the mass of the substance. Here, 259 kJ is released by 5.00 g of C2H6, so ΔH = 259 kJ / 5.00 g = -51.8 kJ/g.

Question 2

How many joules of heat are produced from the burning of methane releasing 125 kJ heat?

Accepted Answer

125 kJ is equivalent to 125,000 J, since 1 kJ equals 1,000 J.

Question 3

The freezing point of methane is − 295 ° F and the boiling point is − 263 ° F. The temperature of the surface of Titan, a moon of Saturn, is 93 K. If methane exists on Titan, it is

Accepted Answer

The temperature of Titan's surface is 93 K, which is approximately -292 °F. This temperature is between the freezing point (-295 °F) and boiling point (-263 °F) of methane, indicating that methane would be in a liquid state.

Question 4

How many kilowatt-hours is generated  when burning 0.562 g of graphite produces 18.0 kJ of heat?

Accepted Answer

The answer of How many kilowatt-hours is generated  when burning...

Question 5

How many kilowatt-hours is generated when burning 2.5 g of methane produces 125 kJ of heat?

Accepted Answer

The answer of How many kilowatt-hours is generated when burning...

Question 6

Which temperature equality is correct?

Accepted Answer

0 K is the absolute zero temperature, which is equal to -273.15 °C.

Question 7

Which of these is a correct unit for measuring energy?
I. Joule
II. Quad
III. KWh
IV. Ampere

Accepted Answer

Joule, Quad, and KWh are all units for measuring energy. Joule is the SI unit, Quad is used in energy statistics, and KWh (kilowatt-hour) is commonly used for electrical energy. Ampere is a unit of electric current, not energy.

Question 8

The rate of energy output or input is known as ____.

Accepted Answer

The rate of energy output or input is known as power. Heat is a form of energy transfer, work is a measure of energy transfer involving mechanical motion, enthalpy is a thermodynamic property related to the heat evolved or absorbed in a process, and entropy is a measure of disorder or randomness in a system. Out of all the options, only power directly relates to the rate of energy input or output.

Question 9

The amount of heat necessary to change a given amount of a substance by 1 ° C is known as ____.

Accepted Answer

Heat capacity is the amount of heat required to change the temperature of a given amount of a substance by 1 °C.

Question 10

Which of these statements is incorrect of exothermic reactions?

Accepted Answer

A cold pack is an example of an endothermic reaction, not exothermic, as it absorbs heat from the surroundings.

Question 11

How many joules of heat must be added to melt a 75 gram block iron if it required 12.2 Calories?

Accepted Answer

The answer of How many joules of heat must be...

Question 12

How many joules of energy are in a candy bar reading 250. Calories?

Accepted Answer

The answer of How many joules of energy are in...

Question 13

How many Calories are released from a burning nut which releases 15,600 J of heat?

Accepted Answer

1 Calorie (Cal) is equivalent to 4.184 Joules (J). To convert 15,600 J to Calories, divide 15,600 by 4.184, which equals approximately 3.73 Cal.

Question 14

Which of these is\are the  correct unit(s)for measuring power?
I. Joule
II. J\s
III. KWh
IV. Watt

Accepted Answer

The correct units for measuring power are J/s (joules per second) and Watt (W).

Question 15

How many joules of heat could be produced from a 170. Calorie package of crackers?

Accepted Answer

170 Calories = 170 x 4.184 kJ = 710 kJ

Question 16

The normal body temperature is 98.6 ° F. What is the temperature in Kelvin?

Accepted Answer

To convert Fahrenheit to Kelvin, use the formula: K = (°F - 32) × 5/9 + 273.15. For 98.6 °F, this equals approximately 310 K.

Question 17

What is the melting temperature in Kelvin if gold melts at 1063 ° C?

Accepted Answer

To convert Celsius to Kelvin, add 273.15 to the Celsius temperature. 1063 °C + 273.15 = 1336.15 K, which rounds to 1336 K.

Question 18

The normal body temperature is 98.6 ° F. What is the temperature in ° C?

Accepted Answer

The formula to convert Fahrenheit to Celsius is:°C = (°F - 32) x 5/9°C = (98.6 - 32) x 5/9°C = 37.0 °C

Question 19

Ethanol boils at a temperature of 78.5 ° C. What is the boiling point in ° F?

Accepted Answer

The boiling point of ethanol in Fahrenheit can be calculated using the formula: °F = (°C × 9/5) + 32. Plugging in 78.5 °C gives (78.5 × 9/5) + 32 = 173.3 °F, which rounds to 173 °F.

Question 20

The Voyager space probe determined that Titan, a moon of Saturn, had a temperature of 93.0 K. What is the temperature in ° F?

Accepted Answer

The answer of The Voyager space probe determined that Titan,...

Quiz 9: Energy for Today

The combustion of 5.00 g of C₂H₆(g) , at constant pressure, releases 259 kJ of heat. Find Δ H for the reaction in kJ\g. 2 C₂H₆(g) + 7 O₂(g) → 4 CO₂(g) + 6 H₂O (l)

How many joules of heat are produced from the burning of methane releasing 125 kJ heat?

The freezing point of methane is − 295 ° F and the boiling point is − 263 ° F. The temperature of the surface of Titan, a moon of Saturn, is 93 K. If methane exists on Titan, it is

How many kilowatt-hours is generated when burning 0.562 g of graphite produces 18.0 kJ of heat?

How many kilowatt-hours is generated when burning 2.5 g of methane produces 125 kJ of heat?

Which temperature equality is correct?

Which of these is a correct unit for measuring energy? I. Joule II. Quad III. KWh IV. Ampere

The rate of energy output or input is known as ____.

The amount of heat necessary to change a given amount of a substance by 1 ° C is known as ____.

Which of these statements is incorrect of exothermic reactions?

How many joules of heat must be added to melt a 75 gram block iron if it required 12.2 Calories?

How many joules of energy are in a candy bar reading 250. Calories?

How many Calories are released from a burning nut which releases 15,600 J of heat?

Which of these is\are the correct unit(s) for measuring power? I. Joule II. J\s III. KWh IV. Watt

How many joules of heat could be produced from a 170. Calorie package of crackers?

The normal body temperature is 98.6 ° F. What is the temperature in Kelvin?

What is the melting temperature in Kelvin if gold melts at 1063 ° C?

The normal body temperature is 98.6 ° F. What is the temperature in ° C?

Ethanol boils at a temperature of 78.5 ° C. What is the boiling point in ° F?

The Voyager space probe determined that Titan, a moon of Saturn, had a temperature of 93.0 K. What is the temperature in ° F?

Quiz 9: Energy for Today

The combustion of 5.00 g of C2H6(g) , at constant pressure, releases 259 kJ of heat. Find Δ H for the reaction in kJ\g. 2 C2H6(g) + 7 O2(g) → 4 CO2(g) + 6 H2O (l)

How many joules of heat are produced from the burning of methane releasing 125 kJ heat?

The freezing point of methane is − 295 ° F and the boiling point is − 263 ° F. The temperature of the surface of Titan, a moon of Saturn, is 93 K. If methane exists on Titan, it is

How many kilowatt-hours is generated when burning 0.562 g of graphite produces 18.0 kJ of heat?

How many kilowatt-hours is generated when burning 2.5 g of methane produces 125 kJ of heat?

Which temperature equality is correct?

Which of these is a correct unit for measuring energy? I. Joule II. Quad III. KWh IV. Ampere

The rate of energy output or input is known as ____.

The amount of heat necessary to change a given amount of a substance by 1 ° C is known as ____.

Which of these statements is incorrect of exothermic reactions?

How many joules of heat must be added to melt a 75 gram block iron if it required 12.2 Calories?

How many joules of energy are in a candy bar reading 250. Calories?

How many Calories are released from a burning nut which releases 15,600 J of heat?

Which of these is\are the correct unit(s) for measuring power? I. Joule II. J\s III. KWh IV. Watt

How many joules of heat could be produced from a 170. Calorie package of crackers?

The normal body temperature is 98.6 ° F. What is the temperature in Kelvin?

What is the melting temperature in Kelvin if gold melts at 1063 ° C?

The normal body temperature is 98.6 ° F. What is the temperature in ° C?

Ethanol boils at a temperature of 78.5 ° C. What is the boiling point in ° F?

The Voyager space probe determined that Titan, a moon of Saturn, had a temperature of 93.0 K. What is the temperature in ° F?

The combustion of 5.00 g of C₂H₆(g) , at constant pressure, releases 259 kJ of heat. Find Δ H for the reaction in kJ\g. 2 C₂H₆(g) + 7 O₂(g) → 4 CO₂(g) + 6 H₂O (l)