Why didn't scientists know about atoms for a long time

How many neutrons exist in the isotope sodium-23?

The density of an object has the equation. If an object has a mass of 85 g and a volume of 92 cm3, what is its density?

How would the carbon cycle be affected if all producers were removed? A. carbon compounds in animals would not be broken down to release carbon dioxide back in to the atmosphere B. carbon would not have a way to enter the bodies of living things C.

Which of the following statements is most likely true about the solubilities of CF4 and CCl2F2 in water? CF4 is soluble in water; CCl2F2 is not. Both CF4 and CCl2F2 are insoluble in water. CF4 is insoluble in water; CCl2F2 is soluble in water.

A cell on a microscope slide and noticed cell walls and cell membrane bound organelles. the students conclude the cells are what

1 mol of an Ideal Gas expands through a turbine adiabatically to produce work. Assuming steady flow conditions, how much work is lost due to the entropy generated, if the surroundings are at 300 K? Give the value of lost work to the nearest J.

According to Table N, which radioactive isotope is best for determiningthe actual age of Earth? (1) 238 U (3) 60 Co (2) 90 Sr (4) 14 C

If 10 moles of H2O are produced how many moles of CO2 are also produced.

BaBr2 is a ionic compound, Covalent compound or a acid

What are the structural features of purines and pyrimidines?