Exam 14: Elements of Chemistry

A skillet is lined with a thin layer of cooking oil followed by a layer of unpopped popcorn kernels. Upon heating the kernels all pop thereby escaping the skillet. Which of the following physical and/or chemical changes occurred?

What is the name of the following compound? NaF

A TV screen looked at from a distance appears as a smooth continuous flow of images. Up close, however, we see this is an illusion. What really exists are a series of tiny dots (pixels). This is similar to a chemist's view of matter in that

An example of basic research is

Is the following transformation representative of a physical change or a chemical change?

What is the name of the following compound? SF₃

The systematic names for water, ammonia, and methane are dihydrogen monoxide, H₂O; trihydrogen nitride, NH₃; and tetrahydrogen carbide, CH₄. Why do most people, including chemists, prefer to use the common names for these compounds?

Which of the following would be considered applied research?

Which of the following would be considered basic research?

A sample of iron weighs more after it rusts because

The following image describes which type of change?

The following image describes what type of change?

If you have one molecule of TiO_2, how many molecules of O₂ does it contain?

Classify the following changes as physical or chemical. Wood burns to ashes; water begins to boil; grass grows; a rock is crushed to powder.

Chemistry is the study of ________.

How would you describe the size of the following object? a blood cell

Is chemistry the study of the submicroscopic, the microscopic, or the macroscopic, or all three?

Oxygen, , is certainly good for you. Does it follow that if small amounts of oxygen are good for you then large amounts of oxygen would be especially good for you?

What do members of the Chemical Manufacturers Association pledge in the Responsible Care program?

How many atoms of Oxygen (O)are in H₃OClO₄