25%of a first order reaction is completed in 30 mint. Find the time required for completion of 50% of reaction

A crucible contains 6.4 g of copper, Cu. How many moles does this amount contain? [Given: Cu=64]

The particles of a substance are arranged in a definite geometric pattern and are constantly vibrating.

Write a balance equation for the following. 1) Aqueous solution tin (II) chloride is added to sodium sulfide solution

Calculate the density if the Mass = 25.69 g and the Volume = 10.5 g/mL

Explain in one sentence why salt dissolved in water is a chemical change

The total number of valence electrons in the phosphate ion is

The reaction below has an equilibrium constant kp=2.2*106 at 298 k. 2cof2 (g) ⇌co2 (g) + cf4 (g) calculate kp for the reaction below. cof2 (g) ⇌12co2 (g) + 12cf4 (g)

The electrical conductivities of the following 0.100 M solutions were measured in an apparatus that contained a light bulb as the indicator of conductivity. Rank the solutions in order of decreasing intensity (brightest to dimmest) of the light bulb.

What is the name of a list of elements arranged according to the ease with which they undergo certain chemical reactions?

Why is it harder for the earth to recover from some natural disasters now? A) Human influence may compound the damage. B) The natural disasters have gotten worse. C) This statement is not true.