What does the atomic number tell us?

What is organic xcemistry

A solution of salt water is boiled. The water evaporates and solid salt remains. Which statement is true? A. The salt and the water have both undergone chemical changes. B.

Classify ... use the periodic table to classify the elements potassium, bromine a d argon according to how likely their atoms lose electrons to form positive ions

Which statement best describes an index fossil? A. a fossil that can be used to establish the absolute age of a rock layer B. a fossil which is formed in a soft sediment by the movement of an animal C. a fossil of an insect captured in amber D.

Explain what is density (a full page)

Compared with a ph of 7, a solution of ph 5 has what times/fraction of the hydrogen concentration?

Write a formulae equation to represent the combustion of carbon to form carbon dioxide and the thermal decomposition of magnesium carbonate

A5.00 liter ballon of gas at 25 degree Celsius is cool to 0 degrees Celsius. What is the volume (liters) of the ballon?

How much thermal energy (q) is required to heat 15.2 g of a metal (specific heat = 0.397 J/G) from 21.0 degrees C to 40.3 degree C

Two gas jars are connected to each other, but they are separated by a closed valve. One gas jar contains oxygen, and the other is empty. What will happen when the valve is opened?