A 60.0-g sample of fermium-253 was placed in a sealed vessel 9.0 days ago. Only 7.5 g of this isotope is now left. What is the half-life of fermium-253?

Which description is not a property of an acid? A turns litmus paper red B bitter taste C corrosive D dissolve metals

5.0 g of copper was heated from 20 degrees Celsius to 80 degrees Celsius. How much energy was used to heat Cu (specific heat capacity of Cu is 0.092 cal/g degrees Celsius)

Identify the element with the electron configuration of 1s2 2s2 2p6 3s2 3p3

Which is not an example of chemistry research in the field of energy? A. developing rechargeable batteries B. producing hook-and-loop tape C. determining the usefulness of oil from soybean plants D. studying the effects of insulation

First, get about 20 mL of the quinine stock solution in a clean beaker to prepare 250 mL of about 2 ppm quinine in 0.05 M H2SO4. Calculate the actual final concentration based on your dilution of the stock solution.

For a chemical reaction to be spontaneous at all temperatures, which of the following conditions must be met? a. ΔS° > 0, ΔH° > 0 b. ΔS° > 0, ΔH° < 0 c. ΔS° < 0, ΔH° < 0 d. ΔS° 0 e.

What is a Binary Compound? Is it related to the Ionic and Molecular compounds? if so, how so?

Which answer correctly describes the difference between covalent and ionic bonds? A. ionic: transfer of protons covalent: transfer of electrons B. ionic: transfer of electrons covalent: transfer of protons C.

What are the first five elementsof the periodic table?

Name 3 characteristics that can be used to identify minerals