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 charge of a single electron A) is 0. B) is - 1 C) depends on how many surround the atom D) depends of which element the atom belongs to

A high pressure gas inflates a balloon, doing 103 joules of work. It happens quickly enough that any heat exchange is negligible.

Suppose you would like to double the speed of a wave on a string. by what multiplicative factor must you increase the tension?

What assumption can be made about the densities of two different spheres that have an identical volume but very different masses?

How the ringing sound of a telephone travels from the phone to your ear

Life cycle of a medium mass star

Use the periodic table to complete this equation that represents the process of nuclear fusion. Superscript 14 Subscript 7 Baseline N + Superscript 1 Subscript 1 Baseline H yields Superscript A Subscript B Baseline C

Josh rolled a bowling ball down a lane in 2.5 seconds. The ball travelled at a constant acceleration of 1.8 m/s/s down the lane and was traveling at a speed of 7.6 m/s by the time it reached the pins at the end of the lane.

How many meters of the rock wall eroded between 1910 and 1927?

As air temperatures increase, evaporation increases. Warmer temperatures also increase the capacity to absorb water vapor. More water vapor in the atmosphere accelerates the greenhouse effect.