When an effervescent tablet is dropped in water, what indicates that a chemical change is occurring?

a. the evolution of a gas

b. the condensation of a gas

c. the melting of a solid

d. the subliming of a solid

The substance coming out of a reaction is called the reactant. True or False?

A 1.8 kg book had been dropped from the top of the football stadium. It's speed is 4.8 m/s when it is 2.9 meters above the ground what is its mechanical energy?

Order the colors of the rainbow starting with the color that is bent the least to the color that is bent the most (when it passes through a prism). Question 1 options: yellow blue indigo orange green red violet

Describe how energy is transferred in on of the sequences

How is it possible for one electrically neutral atom to exert an electrostatic force on other electrically neutral atom?

What is cosmic microwave background radiation?

Ocean water has a salinity of 35 parts per thousand. Fresh water has a salinity of less than 0.5 parts per thousand. What can you conclude from this information? A. Ocean water is rich in salt minerals. B.

You decide to add up all the work you did yesterday. If you accomplished 10,000 newton·meters of work yesterday, how much work did you do in units of joules?

What causes day and night on earth?

A yo-yo can be thought of as a solid cylinder of mass m and radius r that has a light string wrapped around its circumference (see below). One end of the string is held fixed in space.