48 When an atom of the unstable isotope Na-24 decays, it becomes an atom of Mg-24 because the Na-24 atom spontaneously releases (1) an alpha particle (3) a neutron (2) a beta particle (4) a positron

A 0.055 mol sample of formaldehyde vapor, CH2O, was placed in a heated 500 mL vessel and some of it decomposed. The reaction is CH2O (g) H2 (g) + CO (g) At equilibrium, the CH2O (g) concentration was 0.051 mol L-1.

f 23.2 grams of an aqueous solution of nickel (II) iodide, NiI2, contains 5.47 grams of nickel (II) iodide, what is the percentage by mass of nickel (II) iodide in the solution?

Plate tectonics is the movement of lithospheric plates. These plates float on the and move because of mantle.

Explain how you can use physical properties to compare substances.

What is the conservation of mass

Consider the combustion of liquid methanol, ch3oh (l) : ch3oh (l) + 3/2o2 (g) →co2 (g) + 2h2o (l) δh=-726.5kj part a what is the enthalpy change for the reverse reaction?

Type in the correct number for each question in the text box provided. Consider the synthesis of one molecule of glucose.

A steak is cooked on the grill. this is an example of a: a. physical change. b. chemical change.

Which of the following is not a type of biomolecule?

What evidence led Thomson to propose that the mysterious negative particles he was studying were smaller than atoms?