Naturally occurring rubidium consists of about 73.2% rubidium-85 (atomic mass 84.9 u) and 27.8% rubidium-87 (atomic mass 86.9 u). calculate the average atomic mass of rubidium rounding your answer to 0.1 u

A small cup of water is left out on the counter. Three days later, the water is gone. Which phase change describes what has occurred? Melting Sublimation Evaporation Condensation

Why do the elements of period 4 start a new cycle of properties after the element argon? Select all that apply. - The electrons in the outermost energy level are primarily responsible for the properties of an element.

B2Br6+HNO3--->B (NO3) 3+HBr

The pH of a solution is 1. The hydrogen ion concentration of this solution, in moles per liter, is

What is the driving force of the deep water ocean conveyor belt

Plants make their own food. The chemical reaction for this process is shown in the equation below. CO2 + H2O + energy → C6H1206 + O2 What are the products in this chemical reaction? O A. C6H1206 + energy O B. H20 + energy O C. CoH1206+02 O D.

Using ohm's law, explain how voltage changes in relation to current, assuming that resistance remains constant.

An average copper penny minted in the 1960s contained about 3.000 g of copper. how much chalcopyrite had be mined to produce 100 pennies?

Which pack has the greatest change in enthalpy, warm packs (such as hand warmers) or cold packs (such as an ice pack) ?

A gay cylinder what are the variables in gay-lussacs law