A radioisotope is placed near a radiation detector, which registers 80 counts per second. Eight hours later, the detector registers 5 counts per second. What is the half - life of the radioactive isotope

The human genetic disease phenylketonuria (PKU) can result from: A. deficiency of protein in the diet B. inability to catabolize ketone bodies C. inability to convert phenylalanine to tyrosine D. inability to synthesize phenylalanine E.

Which contributes to the dissolution of sugar in water? a. the dissociation of an ionic compound in water b. a strong pull of water molecules on an ionic compound c. the dissociation of a polar covalent compound in water d.

In a certain city, electricity costs $0.16 per kW⋅h. What is the annual cost for electricity to power a lamppost for 7.00 h per day with a 100.

Water (h2o) and hydrogen peroxide (h2o2) both consist of hydrogen and oxygen atoms. Explain why they have different chemical and physical properties

What can you add to a voltaic cell to make it into an electrolytic cell?

Which ionic compound is water soluble? A. cuS B. NH4NO3 C. SrSO4 D. ZnF

What is part of an experiment that is not being tested and is used for comparison

Is hydrogen sulfide a heterogeneous mixture solution compound or element?

Explain why people who like to stay cool on a hot summer day prefer to wear white clothing?

Which of these is a chemical property? A. Mercury is a dense liquid. B. Iodine vapor has a purple color. C. Aluminum is a very conductive metal. D. Ice melts at 0°C. E. Iron rusts in wet weather.