Manganese dioxide (MnO2 (s), Hf = - 520.0 kJ) reacts with aluminum to form aluminum oxide (AI2O3 (s), Hf = - 1699.8 kJ/mol) and manganese according to the equation below.

What is the enthalpy of the reaction?

During the day, water from the ocean is transferred to the atmosphere. Which of the following describes the energy change that takes place during the transfer? Energy is transported from the ocean to the atmosphere which makes the atmosphere warmer.

Write down two other examples of nonrenewable resources.

Question 12 2 pts A gas is initially at STP. When heated to 25°C what will the pressure be in atmospheres assuming constant volume and moles?

A runner completes a 5-mile run. how many yards did she run

Which best compares the phases of matter to marbles in a tray?

Explain how heat would change the density of a parcel of air

In which compound does the bond between the atoms have the least ionic character? 1. hf 2. hcl 3. hbr 4. hi?

When a hypothesis is tested and shown to be incorrect is the experiment a failure?

A homogeneous mixture consists of 12% ethanol, 28% methanol and 60% water. which of these is the solvent for the mixture? A. ethanol and methanol B. methanol C. ethanol D. water

A gas that has a volume of 28.0 liters, a temperature of 45.0 °C, and an unknown pressure has its volume increased to 34.0 liters and its temperature decreased to 35.0 °C. If I measure the pressure after the change to be 2.