Biology chapter 2
Terms in this set (41)
The equation shows a __ --the breaking and forming of chemical bonds that leads to a change in the composition of matter
In the equation, CO2 is a
In the equation C6H12O6 is a
in O2, the type of bond that holds the two oxygen atoms together is a
polar covalent bond
The number of oxygen atoms on the left side of the equation is __ the number of oxygen atoms on the right side
The term for a solution with a low pH number, such as lemon juice or vinegar, is __
The term for a solution that has an equal concentration of H+ and OH- is
The term for a solution with a higher pH number, such as ammonia or bleach is
An acid is a compound that donates __ to a solution
The higher the pH number, the higher the concentration of __ in a solution
A substance that accepts H+ when they are in excess and donates H+ when their concentration drops is called a(n)
Water readily sticks to many other substances, a property called __
Water striders are common insects that can skip across the surface of ponds and streams. This lifestyle is enabled by water's
cohesion and resulting surface tension
Which best describes how charges are distributed on a water molecule?
The oxygen end is negative relative to the end with the two hydrogen atoms
Relative to other substances, water tends to resist changes in temperature. Why?
Water is highly cohesive. It's molecules tend to resist increase in their motion When water is heated, some of the energy is used to disturb the hydrogen bonds between neighboring molecules
Water is sometimes called the "universal solvent" is that accurate?
For the most part, water readily dissolves most substances, but not hydrophobic ones
Which of the following has the smallest mass?
Ionic bonds form when __
one atom transfers an electron to the other
What property of water makes it move upward from the roots of plants?
adhesion AND cohesion
What is an acid? an acid __
donates hydrogen ions to a solution
the number of protons in an uncharged atom
equals the total number of electrons in the orbital shells
Which of the following particles are found in the nucleus of an atom?
Protons and neutrons
What explains the observation that elements in the same chemical group have a similar chemical properties?
Elements in the same group have the same number of electrons
Generally, what determines the number and kinds of chemical bonds an element can make and the chemical reactivity of an element?
the number of electrons in its outer most shell
In hydrochloric acid (HCI), chlorine has greater electronegativity than hydrogen. Therefore
the H side of an HCI molecule would have a slight positive charge
The partial change in this water molecule occur because of
the unequal sharing of electrons between hydrogen and oxygen
A covalent bond is likely to be polar if
one of the atoms sharing electrons is more electronegative
What is the fundamental difference between covalent and ionic bonding
in a covalent bond, the partners share a pair of electrons; in an ionic bond, one partner accepts electrons from the other
the figure below shows five water molecules. The hydrogen bond shown in the figure are each
between an oxygen and a hydrogen atom of different water molecule
The hydrogen atoms of a water molecule are bonds to the oxygen atom by __ bonds, whereas neighboring water molecules are held together by __ bonds
polar covalent, hydrogen
__ are weak bonds that are not strong enough to hold atoms together to form molecules but are strong enough to form bonds within and around large molecules
In the equation 2 h2 + O2 --> 2 H2O, the H2 molecules are __ and the H2O molecules are __
The tendency shown below of water molecules to stick together allows insects to walk on water. This is called
Water's surface tension and heat storage capacity are accounted for by it's
Which of the following statements about water is false?
ice is more dense than liquid water
You've made a hot drink by dissolving a teaspoon of instant coffee and a tea spoon of sugar in a cup of hot water. Which of the following statements is true
you've just prepared an aqueous solution
After reading the paragraph below, answer the question that follows.
You've been experiencing acid indigestion lately, and you'd like a quick fix for the problem. You do a little research on the Internet and discover that your problem is caused by excess stomach acid. In the pharmacy aisles, however, you're having a little trouble deciding what to purchase to address the problem. At the pharmacy counter, the clerk recommends that you purchase PEPCID AC or Alka-Seltzer tablets.
If you were able to chemically analyze your stomach fluids 30 minutes after taking two tablets, you would find
Fewer hydrogen ions
donates H+ ions when conditions become too basic and accepts H+ ions when conditions become too acidic
When you add acid to a solution,
the hydrogen ions concentration increases and lowers the pH
A solution with a pH of 7 is
an acid is __
a compound that donates hydrogen ions to a solution
YOU MIGHT ALSO LIKE...
MCAT | Mometrix Comprehensive Guide
Mastering Biology Chapter 2 & 3
bio1406 Properties of Water
practice test ch 2
OTHER SETS BY THIS CREATOR
Astronomy test 3
Ast test 2
Central ideas OT final
THIS SET IS OFTEN IN FOLDERS WITH...
Ch 2 Chemistry
Biology chapter 2