Which of these is a compound?

A. Steel

B. Sugar

C. Air

D. Nitrogen

A solution is made by dissolving 373.5 g of Pb (NO3) 2 (molar mass: 331.2 g/mol) in 2.00 * 103 g of water. What is the molality of the solution?

Find Molecular Mass: Calculate the mass of one mole of CO2 (carbon dioxide).

Write this numeral in scientific notation. 820.5

Plants are able to carry out photosynthesis because they contain the organelle known as an mitochondrion. is that true or false

Found only in the Sonoran Desert, a saguaro provides a home to many native birds as well as food and water for different organisms that live in the desert ecosystem. Which term best describes the saguaros role in the desert ecosystem? A.

The relationship between pressure and temperature of a gas, when volume and moles of a gas are held constant, is: P*T = k. TRUE FALSE

The system is said to be in dynamic equilibrium when: Select one: a. there is no longer any net change in the concentrations of products or reactants. b. the forward and reverse reactions come to a halt. c. None of these d.

You have a 1 L container of a gas at 20 C and 1 atm. Without opening the container, how could you tell whether the gas is chlorine or fluorine? a. measure the mass of the gas b. measure the speed of the gas molecules c.

A 1.268 g sample of a metal carbonate, MCO3, was treated 100.00 mL of 0.1083 M H2SO4, yielding CO2 gas and an aqueous solution of the metal sulfate. The solution was boiled to remove all of the dissolved CO2 and then was titrated with 0.1241 M NaOH.

1. According to the article, which country may have a greater population than China by the year 2050? A. China B. Kenya C. India D. Germany 2. What does the article list as one reason that drives couples in India to have more children? A.