Why does an exothermic reaction need activation energy?

If the chemical properties of a substance remain unchanged and the appearance or shape of an substance changes it is called a

What only happens during a chemical reaction? A. Colors change. B. New substances are formed. C. Bubbles form. D. A solution is made.

What is the [H₃O⁺] (hydronium concentration) of an aqueous solution that has a pH of 4.00?

The average kinetic energy of gas particles depends on which factor?

Which of the following statements is FALSE? Which of the following statements is FALSE? a. Mixtures may be composed of two or more elements, two or more compounds, or a combination of both. b. A mixture may be either homogeneous or heterogeneous. c.

Does pressure decrease when a gas is removed

This is the ability of matter to change into a different substance.

How can I write ecology in my own words for a definition

The amount of time it takes for one-half of the original amount of an isotope to decay is known as its

If enough heat is added to a substance, electrons begin to separate from the atomic nuclei. Which process does this describe? A. A solid turning into a liquid B. A plasma turning into a gas C. A gas turning into a plasma D.