Quiz 1, Ch.2

39. AB+CD→AD+BE Is this a legitimate example of an exchange reaction? Why or why not?

A component present among the reactants cannot disappear, nor can a component not present in the reactants suddenly appear in the products.

17. ________ reactions release energy. -Catabolic -Exergonic -Decomposition -Catabolic, exergonic, and decomposition

Catabolic, exergonic, and decomposition

13. Which of the following statements about chemical bonds is true? -Covalent bonds are stronger than ionic bonds. -Hydrogen bonds occur between two atoms of-hydrogen. -Bonding readily occurs between nonpolar and polar molecules. -A molecule of water is unlikely to bond with an ion.

Covalent bonds are stronger than ionic bonds.

37. In a hurry one day, you merely rinse your lunch dishes with water. As you are drying your salad bowl, you notice that it still has an oily film. Why was the water alone not effective in cleaning the bowl?

Oils are nonpolar, and are repelled by water.

27. Which of the following is a functional group that is part of a building block of proteins? -phosphate -adenine -amino -ribose

amino

16. AB→A+B is a general notation for a(n) ________ reaction. -anabolic -endergonic -decomposition -exchange

decomposition

25. C6H12O6 is the chemical formula for a ________. -polymer of carbohydrate -pentose monosaccharide -hexose monosaccharide -all of the above

hexose monosaccharide

21. Which of the following is most likely to be found evenly distributed in water in a homogeneous solution? -sodium ions and chloride ions -NaCl molecules -salt crystals -red blood cells

sodium ions and chloride ions

22. Jenny mixes up a batch of pancake batter, then stirs in some chocolate chips. As she is waiting for the first few pancakes to cook, she notices the chocolate chips sinking to the bottom of the clear glass mixing bowl. The chocolate-chip batter is an example of a ________. -solvent -solute -solution -suspension

suspension

20. CH4 is methane. This compound is ________. -inorganic -organic -reactive -a crystal

organic

4. Together, just four elements make up more than 95 percent of the body's mass. These include ________. -calcium, magnesium, iron, and carbon -oxygen, calcium, iron, and nitrogen -sodium, chlorine, carbon, and hydrogen -oxygen, carbon, hydrogen, and nitrogen

oxygen, carbon, hydrogen, and nitrogen

12. A substance formed of crystals of equal numbers of cations and anions held together by ionic bonds is called a(n) ________. -noble gas -salt -electrolyte -dipole

salt