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?

Iodine-131 has a half-life of 8 days what fraction of the original sample would remian at the end of 32 days

A blank observation is when you describe something

List 3 things you learned or reviewed about solids, liquids and gases.

Which statement describes a homogeneous catalyst? It is in a gaseous phase only. It is in the same phase as the reactants. It is completely consumed by reactants. It forms different products than the uncatalyzed reaction forms.

A sample of monatomic chlorine is traveling through a tube at the rate of 25m/s, what is the chlorine's KE? (Mass of CL=35.45g/mol)

The smallest unit of an element is a blank

How many sodium atoms will create an ionic bond with sulfur?

Rank the elements from smallest to largest electronegativity negativity (smallest at top) 1. N 2. P 3. As 4. Sb

A bicyclist pedaling up a Hill. What type of energy potential or kinetic?

What improvements have been made in modern farming? Select all that apply. 1. machines can do more work over less time 2. better seeds sprout and grow much more quickly 3. trains can transport food over long distances faster 4.