Which of the following is not a chemical that can be created by chemists?

O

A. Plastic

O

B. Helium

O

C. Sodium

O

D. Gasoline

Which statement is a scientific theory? the acceleration of an object increases as the force on an object increases. all matter is made up of particles, called atoms, that are constantly moving.

Compare and contrast ultraviolet light with infrared light using wavelength, frequency, and energy.

In circuit A, two resistors R1 and R2 are connected in series. In circuit B, two identical resistors are connected in parallel. Both circuits are powered by identical energy sources and include no other resistors.

Ionic compounds form between elements that are metals and elements that are

What causes the phenomenon of seasons on Earth

Which of the following is not a result or consequence of rising average air temperatures on Earth? Glaciers and ice sheets melt. Sea levels rise. Evaporation increases. Salinity increases.

How does the doppler effect explain differences in sound pitch? choose all that apply?

A generator converts

The standard international unit of measurement S I for mass is the what

What is the stopping distance at night for a passenger vehicle traveling at 50 mph?