Radium-226 has a half life of 1,599 years. What proportion of a sample radium-226 would be left after 4,797 years have passed?

A gas that has a volume of 28 Liters, a Temperature of 318 K, and an unknown pressure initially has its Volume increased to 34 Liters and its Temperature decreased to 308 K.

Is spilling cake batter a physical or a chemical change? Explain why?

A sample of hydrogen gas occupies 1.875L at STP, how many moles of gas are present

Which of the following atoms has the highest electronegativity? (optional) use the periodic table to answer this question a. C b. N c. O d. F

A netural atom contains 50 protons. and 70 neutrons what is the name of the atom

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.