Which of the following is true? Select the correct answer below: Heat and energy are lost during chemical reactions. A warmer object will have lower kinetic energy. A colder object will have higher kinetic energy. Heat flow will continue between objects until the substances in question are at the same temperature.
What is the transfer of thermal energy between two bodies at different temperatures known as? Select the correct answer below: force work heat mass
The kind of energy stored within the bonds of molecules is called: Select the correct answer below: kinetic energy mechanical energy electromagnetic energy chemical potential energy
What is energy? Select the correct answer below: The motion an object possesses The capacity to supply heat or do work The downward flow of temperature in an object all of the above
When a substance undergoes a chemical reaction in an isolated system, which of the following will NOT change for the system? (select all that apply) Select all that apply: temperature energy density mass
Which object has the most gravitational potential energy? Select the correct answer below: an airplane in mid-flight a baseball held by a pitcher a bird on top of a flagpole these objects all have the same gravitational potential energy
Which of the following is an example of an exothermic process? Select the correct answer below: a candle burning melting ice cubes water evaporation baking bread
Calculate the heat capacity of 1,343 g of lead, given that 45 J is needed to raise the temperature by 29.8∘C. Round your answer to the nearest tenth. Provide your answer below: J/ degrees C
The specific heat of nickel is 0.54 J g∘C. Calculate the temperature change if 37 g of nickel absorbs 575 J. Report your answer with the correct number of significant figures. Provide your answer below: ∘C
If a 13.9 g object has a specific heat of 1.31 J g∘C and it experiences a temperature increase from 55.0∘C to 67.5∘C, how much heat in joules did it absorb? Your answer should have three significant figures. (Round your answer to an integer. ) Do not include units in your answer. Provide your answer below:
What is the amount of energy required to raise one gram of water by 1∘C ? Select the correct answer below: a joule a calorie a kelvin a heat index
How much heat is needed to raise the temperature of an aluminum block weighing 0.880 g from 301.0 K to 313.5 K ? The specific heat of aluminum is 0.897 J g∘C. Round to three significant figures. Provide your answer below:
As the mass of a substance increases, which of the following is true? Select the correct answer below: The specific heat does not change, but the heat capacity increases. The specific heat increases and the heat capacity does not change. The specific heat and the heat capacity both stay the same. The specific heat and the heat capacity both increase.
Which is the largest unit of energy? Select the correct answer below: joule calorie Calorie Newton
The SI unit for energy is the Joule. Which of the following is/are equal to 1 joule? Select all that apply. Select all that apply: 1 N×m 1 kg×ms 1 kg×m2 s2 1 Nm
One cast iron pan has a mass of 2.26 kg and a second cast iron pan has a mass of 3.54 kg. Both cast iron pans have the same alloy composition. Which of the following statements are true? (select all that apply) Select all that apply: The two pans will have the same specific heat capacity. The two pans will have the same heat capacity. The heat capacity of the larger pan will be greater than the heat capacity of the smaller pan. The heat capacity of the larger pan will be less than the heat capacity of the smaller pan. The specific heat capacity of the larger pan will be greater than the specific heat capacity of the smaller pan.
The specific heat of air is 1.007 Jg×∘C and the specific heat of nitrogen (N2) is 1.040 Jg×∘C. What is the specific heat of oxygen (O2) ? Select the correct answer below: more than 1.007 Jg×∘C less than 1.007 Jg×∘C between 1.007 Jg×∘C and 1.040 Jg×∘C approximately 1.040 Jg×∘C
If a 20.0 g object at a temperature of 35.0∘C has a specific heat of 2.89 J g∘C, and it releases 450 . J into the atmosphere, what will be the final temperature of the object? Report your answer with the correct number of significant figures. Provide your answer below: degree C
What is the specific heat of a metal that weighs 35 g and absorbs 185 J when the temperature is increased by 41∘C ? Report your answer with the correct number of significant figures. Provide your answer below: J/g degree C
In an exothermic reaction, thermal energy is: Select the correct answer below: unchanged transferred from the surroundings to the system transferred from the system to the surroundings none of the above
In a calorimeter, the components of the measuring apparatus that serve to either provide heat or absorb heat are called the: Select the correct answer below: system surroundings reaction vessel calorimeter
When thermal energy is transferred from the surroundings to the system, heat (q) is: Select the correct answer below: positive balanced unchanged negative
Which of the following is NOT a state function? Select the correct answer below: altitude distance internal energy mass
Calculate the change in enthalpy associated with the combustion of 50.00 g of acetylene. Report your answer with four significant figures. Do not include a comma in your answer. C2H2(g) + 52 O2(g) ⟶ 2 CO2(g) + 2 H2 O(l) ΔHc∘ = −1301.1 kJ/mol Provide your answer below: kJ
The standard state involved for standard enthalpy of combustion implies: Select the correct answer below: 0∘C and 0 atm 0∘C and 1 atm 25∘C and 0 atm 25∘C and 1 atm
The first law of thermodynamics can be represented by the following equation. ΔU = q + w Here, q represents the amount of heat absorbed by the system and w represents the work done on the system by the surroundings. When a system undergoes a change that causes heat to flow into the system and causes the system to do work on the surroundings, what will be the signs on q and w ? Select the correct answer below: positive q, positive w positive q, negative w negative q, positive w negative q, negative w
A reaction that produces heat is and has a ΔH. Select the correct answer below: endothermic, positive exothermic, negative endothermic, negative exothermic, positive
Which of the following is a state function? Select the correct answer below: heat internal energy work all of the above
According to the first law of thermodynamics, work done on a system would cause in internal energy Select the correct answer below: a decrease consistent fluctuation an increase no change
The component of gasoline that gives it such a high enthalpy of combustion is: Select the correct answer below: hydrocarbons carbon hydrogen magnesium
What is the heat of formation reaction for sodium chloride? Select the correct answer below: 2Na + 3Cl2 → NaCl Na + Cl2 → 2NaCl Na + (12)Cl2 → NaCl none of the above
A process that absorbs heat is called a(n) process. Select the correct answer below: endothermic exothermic energetic electric
What specific type of energy is stored in the nucleus of an atom? Select the correct answer below: Mechanical energy Thermal energy Nuclear energy Kinetic energy
What is true about specific heat capacity? Select the correct answer below: It is the same as heat capacity. It is the amount of heat required to increase the temperature of any mass of a specific substance by any amount. It is the amount of heat required to raise the temperature of a specific mass of substance by any temperature change. It is the amount of heat needed to raise a specific mass of substance by a specific temperature change.
An unknown metal absorbs 23.8 J of heat, and its temperature increases by 15.4∘C. What is the heat capacity of the metal? Round your answer to two decimal places. Provide your answer below: J/ degrees C
When 8.11 g of a hydrocarbon is burned in a bomb calorimeter, the temperature increases by 3.75∘C. If the heat capacity of the calorimeter is 58.9 J ∘C and it is submerged in 742 mL of water, how much heat (in kJ ) was produced by the hydrocarbon combustion? Use 4.184 J g∘C for the specific heat capacity of water. Your answer should have three significant figures. Provide your answer below: kJ
A system gains heat from the surroundings and has work done on it by the surroundings. What are the signs of qsystem and wsystem ? Select the correct answer below: qsystem < 0 and wsystem > 0 qsystem > 0 and wsystem > 0 qsystem > 0 and wsystem < 0 qsystem < 0 and wsystem < 0
Nitrogen gas and hydrogen gas react to form ammonia according to the following thermochemical equation. 3H2 + N2 ⟶ 2NH3 ΔH = −96 kJ Write the balanced chemical equation for a reaction involving these substances with the following change in enthalpy. ΔH = 192 kJ Enter a balanced chemical equation. Do NOT enter phase designations. Provide your answer below:
Magnesium (Mg) combusts in air to give a brilliant white light that has been used in photographic flashes and emergency flares. How much heat is produced if 10.0 g Mg is combusted with excess oxygen gas? Mg(s) + 12 O2(g) ⟶ MgO(s) ΔHc∘ = −601.6 kJ/mol Report your answer with three significant figures. Provide your answer below:
A 25.0 g block of Al with specific heat 0.897 J g∘C is placed into 100.0 g of water at 30.0∘C . The final temperature of the system is 38.0∘C What is the initial temperature of the Al? Round your answer to three significant figures. Use 4.184 J g∘C for the specific heat of water. Provide your answer below: degree C