Which statement is true?

A. Some molecules may contain no atoms.

B. Some elements found in nature exist as molecules.

C. Some compounds include only one type of element.

D. Some atoms are made of two or more different elements.

Suppose a friend tells you scientific theory is guesswork and is not supported by evidence

What distance in kilometers does a police car travel with a velocity of 1.5 km/m for 5.0 minutes

An elastic rope is tied securely to a wall. An upward-displaced pulse is introduced in the rope. The pulse travels through the rope, reaches the boundary with the wall and reflects. The reflected pulse will be ...

Gel electrophoresis sorts dna molecules on the basis of their

Which best describes Einstein's new explanation of light and gravity? Einstein created a new law, because his explanation of the interaction between light and gravity provided unity amongst many facts.

Explain the relationship between motion and frame of reference.

Two students are looking at a brightly lit full Moon, illuminated by the reflected light from the Sun. Consider thefollowing discussion between the two students about what the spectrum of moonlight would look like.

When performing a battery load test, what should the load be set to?

If you push on a wall of a building what will happen

A conductor, with outer surface labelled a, contains a cavity, inner surface b. In this cavity there is a conducting sphere of radius r, and surface c. The sphere carries a charge of 1 C, while the conductor a charge of 2 C.