Exam 9: Energy and Chemistry

The synthesis of ammonia via the Haber reaction follows the balanced equation: 3 H₂( g ) + N₂( g ) → 2 NH₃( g ) Δ H = − 99.22 kJ How much heat is created from the synthesis of 7.38 metric tons (1 metric ton = 1000 kg) of ammonia?

A new alloy is designed for use in a car radiator. If the 17.6 kg radiator required 8.69 × 10⁵ J of heat to warm from 22.1 ° C to 155.8 ° C, what is the specific heat of the new alloy?

What are the primary products in the combustion of a hydrocarbon?

Given the following heat of formation values, calculate the heat of reaction for: C₃H₈( g ) + O₂( g ) → CO₂( g ) + H₂O( l ) Δ H_f values in kJ/mol for: C₃H₈( g ) = − 103.8, O₂( g ) = 0, CO₂( g ) = − 393.5, H₂O( l )= − 285.8

The molecular formula of butane is:

The complicated multi-part system designed to balance the demand for electricity with its production is referred to as the electrical grid.

Which of the following reactions correctly describe the formation of NaF( s )?

Thermochemistry describes the energetic consequences of a chemical reaction.

The largest energy use sector (per 2002 data) is:

Stored energy or energy due to position is known as:

As the velocity of moving object doubles, the kinetic energy of the object doubles.

The second law of thermodynamics states that:

If energy is used to move a mass over a distance against resistance, then ____ has been performed.

Deposition refers to the phase transition:

An iron piston in a compressor has a mass of 3.62 kg. If the specific heat of iron is 0.449 J/g ° C, how much heat is required to raise the temperature of the piston from 12.0 ° C to 111.0 ° C?

A chemical reaction that transfers heat from the system (the reaction) to the surroundings is always:

During the phase change from liquid water to gaseous water (steam) the temperature of the water will ____ relatively speaking.

A state function is a variable whose value depends only on the current state of the system.

All energy flow is either heat or work.

A hungry engineering student reaches for a favorite granola bar while working on a statics assignment. If the granola bar contains 240 "calories" (food calorie = 1kcal), how much energy is consumed if the bar is eaten?