When does water act as an acid and a base?

The Number above the elements symobls is the elements atomic number.

A wave takes 0.5 seconds to complete one cycle. Which characteristic of the wave does this description represent?

The energy of light depends on the

X-rays cannot pass through Earth's atmosphere. Which of these is the best location to place a telescope used to observe x-rays from stars? mountain top of building space high-flying aircraft

Which of the observations below provide support for the big bang theory? A. Energy, matter, and light are all quantized, and can only exist in small packets. B. Matter and energy are equivalent.

Which statements accurately describe the Doppler effect?

Describe how mass and distance affect gravitational force.

a bike can climb the inclined road at uniform speed of 72 km/hr by applying force 500N what will be the power applied by the bike?

A wave has a wave length of 2 m and a frequency of 500 Hz, what is its speed?

Can anything block a magnet's force feild?