2. Which types of changes observe the law of

conservation of mass?

A. only changes of state

B. only physical changes

C. only chemical changes

D. physical changes and chemical changes

How many joules of heat are required to heat 125 g aluminum from 19.0°C to 95.5°C?

10% of the earths water is freshwater. True or false?

0.25 grams of magnesium chloride are dissolved to make 50 milliliters of solution. What is the molarity of the solution?

If a sexually reproducing organism has 28 chromosomes in its body cells how many chromosomes did it inherit from each parent

What is something we do on a typical day that involves energy tranformation? give an example of the description of one energy form transformong into another energy form

A rigid cylinder with a movable piston contains a 2.0-liter sample of neon gas at STP. What is the volume of this sample when it's temperature is increased to 30 degrees Celsius while its pressure is decreased to 90 kilopascal

Write a speech aimed at year 7 to explain why some metals lose their shine over time but gold does not.

How many moles of co2 could fit in a 475 ml bag at - 22c and 1.125 atm?

How mant atoms are in 3N2

The type of nuclear decay an unstable nucleus will undergo depends on its ratio of neutrons to protons. The radioisotope cobalt-65 has a ratio of neutrons to protons of 1.41, which is too high for a nucleus of this size.