The initial concentration of C2H6N2 in the first-order reaction C2H6N2→N2+C2H6 is 0.427 M. After 30. seconds, the concentration of C2H6N2 is 0.395 M. What is the rate constant k for the reaction?

The bonds in BaO are best described as

Which statements describes proteins

If you are studying cells and heredity, you are most likely taking a chemistry class. a. True b. False

A student is making some observations of garlic. Which of these is NOT a qualitative observation? A) Garlic is a white edible bulb. B) Garlic has strong pungent odor. C) Garlic produces inflorescence flowers.

Given the balanced equation: AgNO3 (aq) + NaCl (aq) = = > NaNO3 (aq) + AgCl (s) This reaction is classified as (1) synthesis (2) decomposition (3) single replacement (4) double replacement

A substance is analyzed and found to contain 85.7% carbon and 14.3% hydrogen by weight. A gaseous sample of the substance is found to have a density of 1.87 g/L, and 1 mol of it occupies a volume of 22.4 L.

Which property of a mineral sample does not influence how quickly it settles in water? 1) density 2) hardness 3) shape 4) size

Dinitrogen difluoride gas is collected at in an evacuated flask with a measured volume of. When all the gas has been collected, the pressure in the flask is measured to be.

How is the mass number of an isotope expressed in the name of an atom?

1. A sample of sodium chloride (NaCl) has a mass of 28.36g. Calculate the number of moles of NaCl in the sample. Show your work. 2. Calculate the number of moles of each element (number of moles of Na and number of moles of Cl) in NaCl in the sample.