Why is it essential for a calorimetry to be an insulated (closed) system?

A. The heat exchange must originate from only the reaction (system).

B. Thermal insulation minimizes energy loses to the atmosphere.

C. A and B

D. None of the Above

An alpha particle is made up of A. two protons and two electrons B. two electrons only C. two protons and two neutrons

Thermal energy is caused by the motion of?

Which of the following is not a type of biomolecule?

g A chemistry student needs of thiophene for an experiment. She has available of a w/w solution of thiophene in benzene. Calculate the mass of solution the student should use. If there's not enough solution, press the "No solution" button.

What property of water molecules leads to high surface tension?

Many pain relief pills have powder that is enclosed inside a capsule. Why might this type of medicine work faster than a tablet if they both have the same amount and type of medicine?

The element silver has an atomic weight of 108 and consists of two stable isotopes silver-107 and silver-109. The isotope silver-107 has a mass of 107 amu and a percent natural abundance of 51.8 %.

A scientist uses materials in her lab to cut a DNA sample into fragments. What process is the scientist using? A. Gel electrophoresis B. Use of restriction enzymes C. Polymerase chain reaction (PCR) D. Karyotyping

Aluminum is more reactive than iron, yet it is used today for a variety of applications in which iron would corrode (cans, rain gutters, etc.).

Identify three types of coral reefs