Given a 800 mg sample of thorium-231 decomposes via beta emission with a half life of 25.5 hours, how long would it take, in days, for the sample to decay down to 25 mg?

231 0 231

th - > beta pa

90 - 1 91

800 mg / 25 mg

What effect does filtration have on water with a ph of 10?

Ammonia and oxygen react to form nitrogen monoxide and water. Construct your own balanced equation to determine the amount of NO and H 2 O that would form when 2.19 mol N H 3 and 4.93 mol O 2 react.

How does this splitting wedge make work easier? A) increases the applied force (A is incorrect) B) decreases the applied force C) changes the direction of the applied force D) changes the direction and amount of applied force

What would be the formula of the precipitate that forms when pb (no3) 2 (aq) and k2so4 (aq) are mixed?

Determine whether each of the examples or phrases describes an essential amino acid, a nonessential amino acid, or both essential and nonessential amino acids. a table of amino acids can be found here.

A major component of gasoline is octane. When liquid octane is burned in air it reacts with oxygen gas to produce carbon dioxide gas and water vapor. Calculate the moles of carbon dioxide produced by the reaction of of oxygen.

Which of the following statements about transition metals is true? a. They are never found uncombined in nature. b. They include familiar metals such as gold, silver, copper, and nickel. c.

Elements can be separated from one another. Question 6 options: True False

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.