Explain how density can be used to determine if the golden penny is made of solid gold.

The half-life of the radioactive element unobtanium dash 53 is 20 seconds. if 32 grams of unobtanium dash 53 are initially present, how many grams are present after 20 seconds? 40 seconds? 60 seconds? 80 seconds? 100 seconds?

There are 18 periods in the periodic table. Which answer choice rewords the false statement so it is true?

While looking out the window, you see lightening flash and then 3 seconds later, you hear the thunder. How far was the lightening from you? A. 3,300 ft B. 3 miles C. 300 ft

How can a scientific law be expressed as a mathematical equation?

The average atomic mass of nitrogen is 14.0067. The atomic masses of the two stable isotopes of nitrogen.^14 N and^15 N, are 14.003074002 and 15.00010897 amu, respectively. Use this information to determine the percent abundance of^14 N.

Determine the number of moles of hydrogen atoms when you are given 2 moles of water.

35.5 moles of lithium fluoride is dissolved in 65 L of solution

Why can some electric appliances be immersed in water without damage

Which compound has the smallest percent composition by mass of chlorine? (1) HCl (3) LiCl (2) KCl (4) NaCl

Use the E0 values of the following elements: Zn, Cu, Pb, and Al. Which element is the most active reducing agent?