Which of ther following is the best example of a closed system?

What mineral is this. Nearly rectangular in shape and approximately 5 cm by 7 cm in size. Blackish in color with a shiny but nonmetallic luster. Peels off in very thin, flexible sheets and crumbles rather easily.

How many electrons will calcium gain or lose in forming an ion

One strategy to keep college tuition costs down is to attend a (n)

Which of the following statements is true about taste bud preferences?

The round base of a copper tea kettle has a radius of 4 inches. What is the base's circumference? Use 3.14 for ?.

What will happen if the density of an object is less than the density of water?

Which cannot be separated into simpler substances? compound element solution mixture

What jobs involve chesmistry

Think about a neutral magnesium atom. Then think of a magnesium ion with a 2+charge. How are these two alike? How are they different? Be sure to use the terms proton, neutron, and electron in your answer.

What subatomic particle is specifically responsible for combining the atoms together to form a new substance?