Which of the following describes an endothermic reaction?

Thermal energy is released by the system.

Thermal energy is absorbed by the surroundings.

Thermal energy is absorbed by the system.

Thermal energy is not transferred.

How many liters of 0.225 M solutoin of Kl are needed to contain 0.935 moles of Kl?

Determine the specific heat of a 213.0 g piece of metal in J/g•°C if the temperature of the metal drops from 70.2 °C to 25.6 °C when placed in a calorimeter with 250.0 mL of water at an initial temperature of 22.5 °C (specific heat of water is 4.

Calculate 4572cm to meters

What observations can be made with electron microscopes that could be made before?

What is the bond type of CaO

Which of the following is a measure of randomness in a system? A) entropy. B) kinetic energy. C) potential energy. D) chemical energy.

What substance can be broken down by chemical means? A) ammonia B) aluminum C) antimony D) argon (Castle learning question)

How the law of conservation of mass could be useful for investigating chemical changes

A covalent chemical bond is one in which outer-shell electrons of two atoms are shared so as to satisfactorily fill the outer electron shells of both atoms. protons and neutrons are shared by two atoms so as to satisfy the requirements of both atoms.

To break a chemical bond, energy must be (1) absorbed (2) destroyed (3) produced (4) released