Which of the following items represents a chemical change? burning

melting

evaporation

freezing

Carbon has four electrons in its outer electron shell, therefore: Select one: a. it has a filled outer electron shell. b. it can form four single covalent bonds c. it does not react with any other atoms. d. it has a positive charge.

The valence electrons of a germanium atom in the ground state are located in the (1) first shell (3) third shell (2) second shell (4) fourth shell

Suppose a certain species of insect lives in the lush green canopy of the rain forest. Some of the insects are bright green in color, and some are bright yellow. Assume there is a natural predator of the insect in the area.

A 325 ml sample of gas is initially at a pressure of 721 torr and a temperature of 32°c. if this gas is compressed to a volume of 286 ml and the pressure increases to 901 torr, what will be the new temperature of the gas (reported to three

What kind of organic compound is oxybenzone?

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?

A chemist reported that 100 gallons of a gas were available in a laboratory. Which property of the gas did the chemist report?

Is the water density higher than the aluminum density