Ocean Acidification Part A What is the main reason that the oceans are becoming more acidic? the dumping of garbage and sewage into the oceans absorption by the oceans of carbon dioxide generated by burning fossil fuels large crude oil spills in the oceans fertilizer runoff in major rivers flowing into the oceans Correct Part B How much… Read More »

Dissociation of Water Molecules Part A What name is given to this molecule? water hydroxide ion methane glucose hydronium ion Correct A water molecule that gains a hydrogen becomes a hydronium ion. Part B How did this molecule form? A water molecule gained an hydrogen ion from another water molecule. Two water molecules bonded. A water molecule split… Read More »

Acids, Bases, and pH Part A What is the arrow pointing to? electron water molecule hydroxide ion hydrogen ion hydronium ion Correct The arrow is indicating a single proton, a hydrogen ion (H+). Part B What is the arrow pointing to? hydrogen ion hydronium ion proton hydroxide ion water Correct The arrow is indicating a hydroxide ion (OH–).… Read More »

Cohesion of Water Part A What process is illustrated by this animation? To view the animation, click here. Then click on the image to start the animation. What process is illustrated by this animation? push precipitation evaporation gravity antigravity Correct Water is moving up the tree as it evaporates from the leaf surface.

The Polarity of Water Part A Each water molecule is joined to _____ other water molecules by ____ bonds. two … hydrogen two … polar covalent four … hydrogen four … polar covalent three … ionic Correct As can be seen in the illustration on page 1 of the activity titled “The Polarity of Water” a water molecule… Read More »

Nonpolar and Polar Molecules Part A Which of these figures correctly illustrates the nature of the bonding of H2O? Correct Oxygen is more electronegative than hydrogen. Part B What type of bond joins the carbon atom to each of the hydrogen atoms? hydrogen double (nonpolar) covalent ionic polar covalent single (nonpolar) covalent Correct Each carbon-hydrogen bond involves a… Read More »

Ionic Bonds Part A Atoms with the same number of protons but with different electrical charges _____. have different numbers of neutrons have different atomic masses are different isotopes are different ions have different atomic numbers Correct Ions are charged atoms. Part B In salt, what is the nature of the bond between sodium and chlorine? nonpolar covalent… Read More »

Hydrogen Bonds Part A The brackets are indicating a(n) _____ bond. hydrophobic ionic polar covalent hydrogen single (nonpolar) covalent Correct A hydrogen atom with a net positive charge is attracted to an oxygen atom with a net negative charge. Part B What name is given to the bond between water molecules? hydrogen single (nonpolar) covalent polar covalent ionic… Read More »

Covalent Bonds Part A What type of bond is joining the two hydrogen atoms? covalent hydrophobic hydrophilic ionic hydrogen Correct A covalent bond is one in which electron pairs are shared. Part B A(n) _____ refers to two or more atoms held together by covalent bonds. community isotope molecule ion shell Correct A molecule is defined as two… Read More »

Introduction to Experimental Design Part A Which of the following statements is not true of scientific experiments? They must be well documented. They yield useful results regardless of whether the hypothesis is supported or rejected. They must occur under carefully controlled conditions found in a laboratory. Correct Not all experiments are performed under laboratory conditions; many occur outdoors in uncontrolled… Read More »