Which of the following landforms is formed by river erosion?

A ballon is filled with helium gas. Another balloon, of the same size, is filled with nitrogen gas. Explain why the ratio of the masses of the two samples is the same as the ratio of their molar masses.

Classify the reaction: N2 (g) + 3H2 (g) à 2NH3 (g)

F-Block elements are also called inner-transitional elements? give reason.

If the original 1 mL sample were dialyzed twice, successively, against 200 mL of the same HEPES buffer with 0 mM NaCl, what would be the final NaCl concentration in the sample?

When the temperature of a hollow sphere with 685 L (volume) of helium gas is held at 621 K (temp), the pressure of the gas is 1890 kPa. How many moles of the helium does the sphere contain?

A cylinder of oxygen gas contains 2.80 mol of 02. If the volume of the cylinder is 8.58 L, what is the pressure of the 02 if the gas temperature is 294 K.

A housefly's average life span is 3 days. How many minutes is that

The elements in Groups 1 AU) and 7A (17) are all quite reactive. What is a major difference between them?

A certain radioactive element has a half-life of one hour. if you start with 1.0 gram of the element at noon, how much of the radioactive element will be left at 2 p. m.? 0.50 grams 0.25 grams 0.125 grams 0.0 grams

Name two bases which react with dillute sulfuric acid to give zinc sulfate