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duane
Questions and answers by
duane
Questions (23)
In the construction of bridges and skyscrapers, gaps must be left between adjoining steel beams to allow for the expansion and
4 answers
2,305 views
Sodium hydrogen carbonate NaHCO3, also called baking soda, is an active ingredient in some antacids used for the relief of
1 answer
980 views
What is the Molarity of a solution formed by mixing 10.0g H2SO4 with enough water to make 100.0mL of solution?
3 answers
1,187 views
What is the Molarity of a solution formed by mixing 10.0g H2SO4 with enough water to make 100.0mL of solution?
4 answers
1,730 views
Explain why radioactivity can be used as a "clock" to measure the march of geologic time.
3 answers
516 views
A car traveling about 50km/h collides head-on with something solid. The car crumples, slows down and stops. Use the law of
3 answers
869 views
Explain the process of reflection.
3 answers
461 views
Is this balanced correctly NaOH + H2SO4 = Na2SO4 + H2O?
In this equation, Sodium (Na) and Hydrogen (H) atoms are not balanced.
2 answers
833 views
A half-life of mercury-195 is 31 hours. If you start with a sample of 5.00g of pure mercury-195, how much of it will still be
5 answers
3,359 views
the speed of sound in air is given for still air. how would wind affect the speed? what would happen if you shouted into the
1 answer
476 views
how fast would a "jet" fish have to swim to create an "aquatic" boom?
4 answers
1,292 views
why do the tones sound full and rich when you sing in the shower?
2 answers
517 views
if the Moon's spherical surface gave specular reflection, what would it resemble at full moon?
2 answers
603 views
Why when you look at a window from the inside at night, two similar images, one behind the other, are often seen?
2 answers
511 views
what happens when you cut a bar magnet in half? if it were continually cut in half, then would it finally yield two magnetic
4 answers
836 views
how would you go about locating the magnetic north pole assuming it were still on land?
1 answer
352 views
Name the ionic compound form when a Magnesium reacts with chlorine?
2 answers
557 views
what is the correct number of protons, neutrons and electrons in a neutral Cadmium-112 atom?
1 answer
625 views
Determine the percent composition of sodium hydrogen carbonate.
Na H C O3 1*22.999 1*1.008 1*12.011 3*15.999 22.999 1.008 12.011
1 answer
544 views
element 118 was reportedly synthesized in 1999, but the claim was later retracted. as a consequence of that experiment, element
3 answers
908 views
homogenized milk is composed of microscopic globules of fat suspended in a watery medium. is homogenized milk a true solution?
2 answers
537 views
why should you not attempt to take a picture of fluorine?
1 answer
439 views
which of the two system in figure 4 do you think will need the largest motor
5 answers
1,356 views
Answers (2)
I want to become teacher
While the moment in time at which a particular nucleus decays is unpredictable, a collection of atoms of a radioactive nuclide decays exponentially at a rate described by a parameter known as the half-life, usually given in units of years when discussing
