All reactions require activation energy.

a. True

b. False

Properties of dot product

Which planet has the largest day-night temperature difference? A. Venus B. Earth C. Mercury D. Uranus

Atomic # designates the number of in the nucleus

The electric motor of a model train accelerates the train from rest to 0.740 m/s in 30.0 ms. The total mass of the train is 560 g. Find the average power delivered to the train during its acceleration.

Storms usually occur betweena. warm and cold fronts. b. the upper and middle latitudes. c. oceans and lakes. d. the biosphere and the lithosphere.

The scientific method begins with recognizing a problem. The recognized problem in this scenario is, "Why is the printer in the office not working?" Choose the hypotheses that are testable and from which an experiment can be formed.

The correctly balanced equation for H2O2 → H2O + O2 is

How would an unbalanced chemical equation convey misleading information about what took place during a chemical reaction?

A car rounds a 75-m radius curve at a constant speed of 18 m/s. a ball is suspended by a string from the ceiling the car and moves with the car. the angle between the string and the vertical is:

Emission of light from an atom occurs when an electron