Thousands of years people believe the stars move across our sky explain why we now has a different explanation of why stars move across the night sky? Be sure to mention reference.

Metals lose electrons under certain conditions to attain a noble gas electron configuration. How many electrons must be lost by the element Mg? Mg? Which noble gas electron configuration is attained in this process? A. argon B. radon C. xenon D.

A pro golfer hits 45.0-gram golf ball, giving its speed of 75.0 m/s. what is the momenntum has the golfer given to the ball

How can you express the concentration of hydrogen and hydronium ions in a solution?

Calculate the mass (in kg) of an iron block (density = 7.87 g/cm3) with dimensions 5.28 cm x 1.24 ft x 4.95 in.

Given a [pOH] = 1.2, what is the [OH-]? A. 0.06 B. 3.5 C. 7.5 D. 10.7

Could the concentration of reactants ever be equal to the concentration of products for a reaction at equilibrium? Explain why or why not.

A nonvesicular rock is made entirely of green 2-millimeter-diameter crystals that have a hardness of 6.5 and show fracture, but not cleavage. The rock is most likely

What is the mass of 2.13 moles of lithium arsenate

What is the name fro H2O

A scientist has a tomato plant with red-skinned tomatoes. It has one allele for red skin (R) and one for yellow skin (r). Which describes the phenotype of the tomato plant?