Which of these describes an endothermic reaction?

-Energy is absorbed by the reaction.

-Energy is released by the reaction.

-Energy is created in the reaction.

-No energy is transferred by the reaction.

What is the answer?

Calculate the mass of nacl required to prepare 0.5 liters of a 2.5 molar solution of nacl.

What changes might you observe in a rock as it is weathered

Vapor pressure is related to the temperature of the liquid. true or false.

The first law of thermodynamics states that E=Q-W. How is this also a statement of principle of conservation of energy? A. A change in internal energy causes work to be done and heat to flow into the system. B.

As seen in the following reaction, O2 + 2H2 à 2H2O, what particles composing the oxygen atoms (O2) and hydrogen atoms (H2) were directly involved in making the chemical reaction which created the water molecules?

When the system is at equilibrium, it contains NO 2 at a pressure of 0.817 atm, and N 2 O 4 at a pressure of 0.0667 atm. The volume of the container is then reduced to half its original volume.

Which statement best describes the role of the sun in creating wind? Question 2 options: The rays of the sun push the air in all directions, creating wind The radiation of the sun reacts with water over the ocean The energy of the sun heats the land

Write the formula for a complex formed between zn2 and nh3, with a coordination number of 3.

Gloria is writing the chemical formula for a compound using its chemical name. She has just identified the names of the elements in the compound. What tool will she use next?

Warm-Up A 206-gram bar of iron has sunlight shining on it. Initially, its temperature is 24.7°C. As it gains 1,070.79 joules of energy, its temperature rises to 36.2°C. Calculate the specific heat capacity of the iron bar using the formula Q = mCAT.