N an exothermic reaction, what is true of the enthalpy?

A. It has increased.

B. It has decreased.

C. It has remained unchanged.

D. It has, at minimum, doubled.

What happens to the reactants when a chemical reaction takes place? A. They all remain intact. B. They are destroyed, or consumed by the reaction. C. Their chemical bonds are broken and rearranged.

What happens when two sound waves meet in constructive interference? A. The frequency increases. B. The sound disappears. C. The sound gets softer. D. The sound gets louder.

What is formed when two or more atoms are held together by covalent bonds?

Why is electron affinity positive when the second electron is added to oxygen

Br2 + NaF - > Which best completes the chemical equation?

If the titrant has a molarity of 0.1000 m and there are 45.00 ml of analyte present, what is the molarity of the analyte?

How is the hardness range for a mineral determined?

How do I find density

Which statement describes a concept included in the wave-mechanical model of the atom? 1. Positrons are located in shells outside the nucleus. 2. Neutrons are located in shells outside the nucleus. 3.

The process by which rocks are broken down into smaller fragments by the atmosphere and other factors in the environment is called?