Science Ch 21 Test Guide

Most chemists focus on... A) applied research to provide us with new technology B) Basic research to provide us with new technology C) Applied research to learn more about our universe D) Basic research to learn more about our universe data

A

Of the four boxes shown above, which contain elements? (IN CH 21 SHEET TEST #10)

A

In the boxes shown above, each solid circle represents an atom of the same element. How many different types of molecules are depicted in the above transformation. a) 1 b) 2 c) 3 d) 4 e) 5

B

Of the four boxes shown above, which contain compounds? (IN CH 21 SHEET TEST #11)

B

The circles in the box shown above represent the submicroscopic particles of a material in its three phases. From left to right these are... (PICTURE ON CH TEST SHEET #8) A) Solid, liquid, gas B) Liquid, solid, gas C) Gas, solid, liquid D) Gas, liquid, solid

B

The physical properties of a compound are... a) a blend of the physical properties of the elements from which it is made b) uniquely different from the physical properties of the elements from which it is made c) a result of the physical properties of the elements from which is made d) the same are the physical properties of the elements from which it is made

B

How does chemistry differ from biology?

Biology is the study of life (can see with microscope) Chemistry is living and non living (can't see with microscope)

During a chemical change... A) the physical properties of a substance change B) molecules change how they are oriented relative to one another C) Atoms change partners to form a new material D) there I typically less energy involved than in a physical change

C

In the previous question, which reactant remained unreacted? (QUESTION IN TEST SHEET #15) A) A B) B C) C D) D E) None

C

The reaction represented in the following diagrams is best described by which of the following balanced equations? (QUESTION IN TEST SHEET #14)

D

Chemical equations are balanced by modifying the subscripts of chemical formula data T/F

False

Molecules are of the microscopic realm T/F

False

Sodium chloride is toxic because of the sodium metal is contains T/F

False

The freezing water is an example of chemical change T/F

False

Matter cannot be created nor destroyed is known as...?

Law of Conservation of Matter

Are atoms made of molecules or are molecules made of atoms?

Molecules are made of atoms

A compound is made of atoms from different elements T/F

True