Rust is made of a two different kinds of atoms. Some of the atoms have 26 protons, while the others have only 8 protons. Hint: You may use a periodic table to answer this question.

Which are the two different elements that make up rust?

Balance the following equation in basic solution. Indicate what is oxidized, what is reduced, what is the oxidizing agent, and what is the reducing agent. Al + NO3 - - > Al (OH) 4 + NH3

Identify the six toxicological principles that are applied in evaluating a poisoned individual.

Which statement correctly describes a physical change? involves breaking and creating chemical bonds but not changing a phase may involve a change in phase but does not involve a change in the molecular structure may involve converting two or more

Suppose an empty plastic bottle is sealed tightly at room temperature and then placed in the freezer. After some time the bottle changes shape. The bottle becomes slightly crushed as the volume of the air in it decreases.

Which of the following are chemicals? A. clothing B. food C. fuels D. all of the above

What happens to the vapor pressure as more solute, such as sugar, is added to a solution? a. The vapor pressure increases c. The vapor pressure does not change b. The vapor pressure decreases d.

What is the final stage of cell division where the cytoplasm is divided among the two new daughter cells? A) G1 B) anaphase C) cytokinesis D) interphase

Consider two equal size rooms connected by an open door. One room is maintained at a higher temperature then the other one. Which room contains more air molecules? Explain.

When and how was benzene first used

How does magnification occur in an electron microscope?