A 6.00 g sample of calcium sulfide is found to contain 3.33 g of calcium. what is the percent by mass of sulfur in the compound?

How does changing the position of a light source such as a flashlight affect the size of an object's shadow

A 155.0 9 piece of copper at 182 °C Is dropped into 2500 g of water at 23.9 °C. (The specific heat of copper is 0.385 1/9°C.) Calculate the final temperature of the mixture. (Assume no heat loss to the surroundings.)

Calculate the partial pressure of the CO2 in the expired air at its peak, assuming 1 atm pressure and a body temperature of 37∘C.

Which of the following is an illuminated object

State one major difference between having a nitrogen atom in a ring structure and having an oxygen atom in that structure

The molar heats of fusion and sublimation of lead are 4.77 and 182.8 kj/mol, respectively. estimate the molar heat of vaporization of molten lead.

What happens when Ag + is reacted with Na2CO3

Name two different ecosystems. Name one living part of each ecosystem. Name one non living part of each ecosystem.

Sports trainers treat sprains and soreness with ethyl bromide. it is manufactured by reacting ethylene with hydrogen bromide:

When the particles of a gas decrease in energy what happens? It freezes It changes to a liquid It changes to a plasma It gets hotter