Which one of these elements is an alkaline earth metal

A student is conducting an experiment to determine how cold temperatures affect the growth of tadpoles in a tank of water.

a sample of gas at 62 degrees C occupies a volume of 4.80 L at a pressure of 2.90 atm. how many moles of gas are comtained in the sample?

The reaction of 7.8 g benzene, C6H6, with excess HNO3 resulted in 0.90 g of H20. What is the percentage yield? C6H6 + HNO3 - C6H5NO2 + H2O Molar Mass: C6H6 = 78 g/mol; HNO3 = 63 g/mol; C6H5NO2 = 123 g/mol; H2O = 18 g/mol

What is a chemical formula? stoms A. An identification of the atoms in a molecule B. The arrangement of electrons in an atom C. Instructions on how a chemical is made O D. Two or more atom's bonded together TV

How can you determine if an unknown substance is a mineral

How do find the volume of 60.0g of ether if the density is. 70g/mL?

A population of crabs live on a light-colored sandy beach. In this environment there is a population of birds that eat the crabs. One year, there is a volcanic eruption near the beach and dark volcanic ash covers the beach.

It would take one light year to travel to the sun? True or false?

A specific, electrically neutral atom of boron has 5 protons, 5 electrons, and 6 neutrons. what is the mass number of this atom of boron? 6 5 11 16

When does hail happen?