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 th

half-life of fermium-253?

3.0 days

4.5 days

17.5 days

20.0 days

What type of matter is toluene

In the teapot dome scandal, what did the secretary of the interior albert fall lease

How did ernest rutherford's discovery affect the model of the atom? a. it proposed that the positive charge was concentrated in the nucleus. b. it proposed that atoms are mostly composed of empty space. c.

How many dots should be shown in the Lewis dot diagram of carbon? 1 2 3 4

Is Sr3 (PO4) 2 ionic or covalent

One gram of lipid yields about 9kcal of energy. that is due to the high abundance of which chemical element?

Which of the following happens during a chemical change? Check all of the boxes that apply 0 One atom or more changes into atoms of another element. New substances with different properties are formed. O Solids, liquids, or gases may form.

The energy derived from the movement of H + ions down an electrochemical gradient from the intermembrane space into the matrix is used to drive the synthesis of ATP. How many H + ions must be moved into the matrix for the synthesis of 1 ATP?

Consider two solutions, solution a and solution b. [h+] in solution a is 370 times greater than that in solution b. part a what is the difference in the ph values of the two solutions?

All of the following are possible sources of error in a scientific investigation except for O measuring materials such as mass and volume incorrectly. o recording experimental data incorrectly. o having a constant in your experiment.