Radioactive isotopes have been used commercially in:

smoke detectors

older watches with luminescent dials

sterilization of food

all of these applications

The molality of a solution that was made by dissolving NaCl in 1.5 kg of water is 0.40 m. If the molar mass of NaCl is 58.44 g/mol, what is the mass of NaCl that was dissolved? 0.27 g 23 g 35 g 39 g

Examples of chemical changes

Part of 19th century chemist john dalton's atomic theory was that different elements differ in their physical and chemical properties.

Calculate the number of moles 56.75 g of Al (NO3) 3 8.35 g of Al2 (SO4) 3 3.8 g of FeSO4

A block of aluminum occupies a volume of 15.0 mL abd weighs 40.5 g. What is its density?

Which type of bond forms between water molecules? a. strong bond b. hydrogen bond c. covalent bond d. polar bond

Down syndrome is caused by the presence of an extra copy of chromosome 21. how would a karyotype identify a person with down syndrome? a) ID physical characteristics of someone with the disease.

Which expression is a measurement of denisty

Compare the information provided by a molecules chemical formula to the information provided by its structural formula

How is a circle different from an ellipse