A penny has a total mass of 3.1 grams. Zinc makes up 2.9 g of the penny. What is the percentage of zinc in the penny?

Potentially hazardous foods on their way for delivery to your establishment must be kept at what temperature

When atmospheric carbon dioxide reacts with water in the atmosphere, it forms carbonic acid. This acid can then react with some forms of rock, weakening it and changing its chemical composition. What is this known as?

Which gas is not a greenhouse gas, A methane, B Water Vapor, C, Carbon dioxide, D, Nitrogen, E, Ozone

Name three chemical properties of wood

The graph shows the change in concentration of one of the species in the reaction AB

Periodic table, chemistry questions who discovered lanthanides. how did they discover it, when did they discover it.

A flask containing 155cm^3 of hydrogen was collected under a pressure of 22.5kPa. What pressure would have been required in order for the volume of the gas to have been 90.0 cm^3 at constant temperature?

Which change is most likely to occur when a molecule of H2 and a molecule of I2 collide with proper orientation and sufficient energy? 1. a chemical change, because a compound is formed 2. a chemical change, because an element is formed 3.

Which substance is a diatomic molecule? a. he b. o2 c. co2 d. h2o?

What is the difference between the electronegativity values of sodium and bromine?