What is the half-life of a 0.5 g sample of radioisotope that decayed to 0.125 g in 9.6 min?

What discovery by Ørsted led to the development of electromagnets? A Electric currents produce magnetic fields. B Magnetic fields produce electric currents. C Magnets produce electricity. D Magnets produce heat.

Time (s) [NO2] (mol/L) 0 0.500 1,200 0.444 3,000 0.381 4,500 0.340 9,000 0.250 (Note: The rate law only depends on the concentration of NO2.) Consider the reaction NO2 (g) + CO (g) → NO (g) + CO2 (g).

Consider the reaction below. 2C6H14 + 190212C02 + 14H20 How many moles of hexane (C6H14) must burn to form 18.4 mol of carbon dioxide? 1.53 mol 3.07 mol 110. mol 175. mol

Kingfishers in new guinea are separated into distinct subspecies. which two subspecies would you expect to be most genetically different from one another?

An element whose atoms have the electron configurations 2-8-18-1?

Structural formula and type of reaction for each a) 4-nonene and fluorine b) hexane and oxygen gas c) pentanol and butanoic acid d) propane and hydrogen gas

Which statement is true for a pure compound but NOT true for a pure element?

Which one is uncelluar and which is multicelluar? crab or pond organism

An atom of lithium loses an electron. What is the effect of this event? Group of answer choices The atom of a different element is formed. The atom of lithium acquires no charge. The atom of lithium becomes a positively charged ion.

Water interacts with polar substances like - OH groups but not with non-polar substances like methyl (-CH3) or ethyl groups (-CH2). Using this information, select the molecules that will easily dissolve in water based on polarity not on size.