Which of these formulas represents 1 atom of sodium (Na) chemically combined with another element?

A. PbS

B. NaCl

C. 2NaOH

D. Na2H3IO6

Describe the motion of the car as it moved across the floor

What is the mass of the sun times 54

Element Z has a half-life of 20 minutes. In an events chain concept map tracing the nuclear decay of a 200g sample of element Z, would any of element Z remain after 160 minutes? If so, how much?

As the wavelength decreases, the frequency

A proton is traveling - x direction through a uniform magnetic field which is in the + x direction. In which direction will the proton be immediately pushed.

Block 1 and Block 2 have the same mass, m, and are released from the top of two inclined planes of the same height making 30 degree and 60 degree angles with the horizontal direction, respectively.

Water waves change direction when they encounter water of different depths and begin to move at different wave speeds. This is called A. reflection B. constructive interference C. the Doppler effect D. refraction

Along with an alpha particle what other product is produced in the alpha decay of americium-241

What does Newton's second law of motion say

Two sinusoidal waves are moving through a medium in the positive x-direction, both having amplitudes of 7.00 cm, a wave number of k=3.00m-1, an angular frequency of ω=2.50s-1, and a period of 6.00 s, but one has a phase shift of an angle ϕ=π12rad.