What is approximate half-life of carbon-14?

A. 300 years

B. 2,400 years

C. 5,720 years

Determine the pH of 0.10 M NH3 solution. NH3 is a weak base with a Kb equal to 1.8x10-5 (round to the nearest whole number)

A mixture with H2 and He exerts a total pressure of 0.48 atm. If there is 1.0 g of H2 and 1.0 g of He in the mixture, what is the partial pressure of the helium gas?

Which elements combine by forming an ionic bond 1) sodium and hydrogen 2) sodium and oxygen 3) carbon and oxygen 4) carbon and sulfur

Density is ___ to pressure

A gene is a section of dna within a chromosome that codes for a

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.

Which of the following statements is not considered weather? The wind is blowing 20 miles per hour right now in Kansas. It is raining in Seattle. It is usually humid in Florida. It is snowing in Colorado.