A 50-gram sample of a radioactive nuclide is left to decay for 10 hours. At the end of 10 hours, only 25 grams of the sample is left. What is the half-life of the nuclide sample?

Define chemical symbol and what is the significance of a chemical symbol. who first invented a chemical symbol.

What is nano in the 10th power

Using two spring scales, students pull on opposite sides of a dynamic cart at rest. 7 Newtons of force is pulling left and 5 Newtons force is pulling right. Describe the motion of the cart? A) The cart will move to the right.

A student has a solution with a pH of 7. The student adds HF, hydrogen floride, to the solution, hoping to increases the pH of the solution. What is wrong with this student's approach? Select one: A. You cannot change the pH of a solution. B.

What does the subscript 2 show in this chemical equation? h2o → 2h o a. there are 2 oxygen atoms. b. there are 2 hydrogen atoms. c. there is half of a hydrogen atom. d. there are 2 water molecules.

Which of the following is not a possible sublevel? 1s 2p 3f 4d

Fish breathe oxygen, o2, dissolved in the water. since water is a polar substance and oxygen is a nonpolar substance, how can there be any oxygen, o2, in the water?

Barium carbonate, baco3, is stable at ambient temperatures, but decomposes to barium oxide and carbon dioxide at higher temperatures.

How do an isotope and a radioactive isotope differ?

What is a cause of polarity in water molecules?