What are the four ways to tell if a chemical change has occurred?

Explain why magnesium hydroxide has the formula Mg (OH) 2

In the human body is about 10 pounds of blood how much does The water in the blood weigh

Before dinner, Mr. Larsen pushes his daughter Sally on her swing for a few minutes. The chain creaks and rubs against the metal hook at the top of the bar as she swings through the air. After he stops pushing her, she slows down and eventually stops.

1 Which best defines concentration? A ratio that describes the amount of solute divided by the amount of solvent or solution B ratio that describes the amount of solvent or solution divided by the amount of solute C ratio that describes the mass of

It takes 157./kjmol to break a nitrogen-oxygen single bond. calculate the maximum wavelength of light for which a nitrogen-oxygen single bond could be broken by absorbing a single photon. round your answer to 3 significant digits.

The first ionization energy, e, of a potassium atom is 0.696 aj. what is the wavelength of light, in nm, that is just sufficient to ionize a potassium atom? values for constants can be found here.

A gene is a to a chromosome as (A) a pea is to a pod (B) a front to a back (C) a bike is to a car (D) a building is to a window

How are you enjoying this weather? (i need good reasons}

In today's experiment, some lab students let their chromatograms elute slightly longer than others. If one student's solvent front traveled to 9.80 cm, and another student's solvent front traveled 8.

What does squeezing do to the particles of snow or ice?