SCI 335 Week 1 Quiz 2

SCI 335 Week 1 Quiz 2 | Wilmington University

Week 2 - Test Chapter 2

Question 1

If an atom has 3 electrons in its second shell and its first shell is filled, it will tend to

·         lose 3 electrons from its second shell.  

·         lose all of the electrons from its first shell.  

·         lose all of the electrons from its first and second shells.  

·         gain 2 electrons in its second shell.

Question 2

A complete atom is electrically neutral because the number of    

·         positively charged protons and neutral neutrons are equal.  

·         negatively charged electrons and neutral neutrons are equal.  

·         negative electrons and positive protons are equal.  

·         None of these is correct.

Question 3

The first electron shell of an atom can hold a maximum of    

·         1 electron.  

·         2 electrons.  

·         4 electrons.  

·         8 electrons.

Question 4

The formula H2O means    

·         an atom contains two hydrogen molecules and one oxygen molecule.  

·         an atom contains one hydrogen molecule and two oxygen molecules.  

·         a molecule contains two hydrogen atoms and one oxygen atom.  

·         a molecule contains one hydrogen atom and two oxygen atoms.

Question 5

Which of the following substances is an element?    

·         iron

·         water 

·         salt  

·         glucose

Question 6

Electrolytes are substances that    

·         form covalent bonds with water.  

·         ionize when dissolved in water.  

·         cannot conduct electricity in solution.  

·         are not found in the human body in any appreciable amounts.

Question 7

A solution that contains equal numbers of hydrogen and hydroxyl ions would be called  

·         acidic.  

·         basic.  

·         alkaline.  

·         neutral.

Question 8

A decomposition reaction can be symbolized by    

·         A + B → C + D.  

·         A + B → AB.  

·         AB → A + B.  

·         C + D → AB.

Question 9

Synthesis reactions are particularly important in the body for    

·         release of energy.  

·         digestion of food products.  

·         growth of body parts.  

·         neutralization of acids by buffers.

Question 10

The pH scale can be described as a scale in which    

·         a tenfold difference in the hydrogen ion concentration occurs between each whole number on the scale.  

·         the lower the whole number on the scale, the greater the H+ concentration.  

·         pH values above 7 are basic.  

·         All of these are correct.

Question 11

Organic substances are distinguished by molecules that ______, whereas inorganic substances are distinguished by molecules that ______.    

·         contain carbon; will not dissolve in water  

·         do not contain carbon; do contain carbon  

·         contain carbon; do not contain carbon  

·         are small; are very large

Question 12

The general characteristics of proteins are that they    

·         serve as structural materials, energy sources, and chemical messengers.  

·         contain C, H, O, and N, and sometimes sulfur.  

·         can act as enzymes.  

·         All of these are correct.

Question 13

An enzyme is defined as a    

·         protein that speeds up chemical reactions without being changed or depleted.  

·         protein that functions as a hormone.  

·         protein that inhibits chemical reactions by being changed or depleted.  

·         fibrous protein that is used to help build certain tissues in the body.

Question 14

A protein can become denatured when    

·         bonds between C-O are broken. 

·         weak hydrogen bonds are broken.  

·         peptide bonds are broken.  

·         None of these is correct.

Question 15

A person has alkalosis if the blood pH    

·         rises above 7.0.  

·         drops below 7.0.  

·         rises above 7.4.  

·         drops below 7.4.