Often on a topographic map, every fifth contour line is darkened. What is this line called?

What is the molarity of 3.2 moles of magnesium chloride in 1.5 L of water

Which of the following are correct statements? Check all that apply. A. A neutron is a neutral particle in the nucleus. B. A proton is a positively charged particle that orbits the nucleus. C.

What are 4 ways that water can go through a physical change?

Al (s) + O2 (g) Al2O3 (s) (a) Consider the unbalanced equation above. How many grams of O2 are required to react with 49.0 g of aluminum? Use at least as many significant figures in your molar masses as in the data given.

What are the two different types of ocean currents, and how are they formed?

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?

For the reaction, calculate how many moles of the product form when 0.012 mol of O2 completely reacts. Assume that there is more than enough of the other reactant. 4Al (s) + 3O2 (g) →2Al2O3 (s) Express your answer using two significant figures.