After two half-lives, a sample contains 10 grams of parent isotopes. How many grams of the parent isotope were present to start?

A body that's moving with a negative acceleration is said to be?

What is a common factor associated with most severe storms?

A nickle is about 2 millimeters thick, or 2/1000 of a meter. how many nanometers is this?

What defines a mixture? A) A mixture contains different substances that are chemically combined. B) A mixture contains different substances that are not chemically combined and can be broken down into its basic substances through physical means.

Consider the reaction 2no2 (g) → n2o4 (g) and δg∘ (no2 (g)) = 51.84 kj/mol, δg∘ (n2o4 (g)) = 98.28 kj/mol. calculate δg at 298 k if the partial pressures of no2 and n2o4 are 0.38atm and 1.64atm, respectively.

A farmer has concerns about the nitrogen levels in her soils. What can she do to ensure that the nitrogen bacteria are replenished in the soil? Question 6 options: Clear cut the area surrounding the field.

The changing of gas to liquid

A very simple assumption for the specific heat of a crystalline solid is that each vibrational mode of the solid acts independently and is fully excited and thus cv=3NAkB=24.9 kJ / (kmol⋅K). This is called the law of Dulong and Petit.

How many elements are found in the following chemical equation? K + Cl → KCl A. 1 B. 2 C. 3 D. 0

How many liters of 0.85 M HCl solution would react completely with 3.5 moles Ca (OH) 2?