Do change that cannot be easily reversed such as burning observe the law of conservation of mass

The Air Quality Index measures A. the level of carbon monoxide over the previous ten days. B. deterioration in the ozone layer. C. concentration of five air pollutants of concern to health. D. amount that visibility is diminished by smog.

A world-class cyclist can average about 15.5 m/s on a bike during a sprint. At this rate, how much distance can he cover in an hour?

What are the three physical properties of gases?

The nucleus of an ordinary hydrogen atom consists of what

The current theory of the structure of the Earth, called plate tectonics, tells us that the continents are in constant motion.

A 1000 kg satellite and a 2000 kg satellite follow exactly the same orbit around the earth. What is the ratio F1/F2 of the gravitational force on the first satellite to that on the second satellite?

How does the skater's kinetic energy changes as he moves down the ramp?

A 50.0kg bicyclist on a 10.0kg bicycle speeds up from a 5.00m/s to 10.0m/s

How tightly does mass need to be compacted in order to become a black hole? (2 words)

2NaClO = 2NaCl + O2 what kind of reaction is happening