Q1. An electrically neutral atom bears what trait?
A. It contains protons in its nucleus.
B. It contains the same number of protons and neutrons.
C. It contains the same number of electrons and protons.
D. It contains electrons in its electron shells.
Answer- It contains the same number of electrons and protons.
Q2. Isotopes of the same element vary in the number of _______________ they contain.
A. protons
B. neutrons in their nuclei
C. electrons
D. radioactive particles
Answer- neutrons in their nuclei
Q3. Radioactive isotopes emit energy or particles until they reach a stable form. Which type of radiation emitted by a radioactive isotope can be the most penetrating, and thus the most damaging, to living things?
A. alpha radiation
B. beta radiation
C. gamma radiation
D. atomic radiation
Answer- gamma radiation
Q4. Ionic bonds tend to form between ____________________.
A. atoms that have become electrically, and oppositely, charged
B. atoms that share a single pair of electrons
C. atoms that share two pairs of electrons
D. hydrogen and oxygen atoms that bear weak but opposite charges
Answer- atoms that have become electrically, and oppositely, charged
Q5. Which of these molecular formulas represents both a molecule and a compound?
A. H2
B. O2
C. N2
D. C6H12O6
Answer- C6H12O6
Q6. Chemical reactions occur as bonds are formed or broken between molecules. The molecules that are changed by a reaction are called _______________.
A. products
B. ions
C. reactants
D. acids
Answer- reactants
Q7. The reaction NaCl
A. Na+ + Cl-, as written, represents what type of reaction?
B. synthesis reaction
C. decomposition reaction
D. exchange reaction
Answer- synthesis reaction
Q8. Electrolytes that release hydrogen ions (H+) in water are called ________________.
A. acids
B. bases
C. salts
D. electrically neutral
Answer- acids
Q9. A substance with a hydrogen ion concentration of 0.000001 g/L has a pH of ___________.
A. 2
B. 5
C. 6
D. 7
Answer- 6
Q10. Animal "starch," or _______________, consists of branched chains of sugar units and functions to store energy.
A. glycogen
B. steroids
C. dextrose
D. cellulose
Answer- glycogen
Q11. The type of lipid responsible for forming the basic bilayer structure of a cell membrane is a _________________ molecule.
A. glycerol
B. steroid
C. phospholipid
D. hormone
Answer- phospholipid
Q12. A fatty acid in which the carbon atoms are all linked by single carbon- carbon bonds is said to be _________________.
A. polyunsaturated
B. monounsaturated
C. linked
D. saturated
Answer- saturated
Q13. Choose the correct statement about proteins and their structure.
A. Hydrogen bonding rarely occurs in proteins.
B. Most proteins are made from a short chain of amino acids.
C. A denatured protein is equally effective as the protein in its original shape.
D. A protein's conformation determines its function.
Answer- A protein's conformation determines its function.
Q14. Myoglobin, hemoglobin, and many enzymes are ________________ proteins.
A. globular
B. fibrous
C. linear
D. pleated sheer
Answer- globular
Q15. DNA contains each of the following components, except ______________.
A. 5-carbon sugar
B. a single polynucleotide chain
C. phosphate group
D. organic base
Answer- a single polynucleotide chain
Q16. The smallest unit of matter is the _____.
A. atom
B. molecule
C. element
D. electron
Answer- atom
Q17. Which of the following does not belong with the others?
A. proton
B. neutron
C. electron
D. nucleus
Answer- electron
Q18. What is the sum of the neutrons plus protons equal to?
A. atomic number
B. mass number
C. atomic symbol
D. atomic weight
Answer- atomic weight
Q19. Which of the following is not as abundant as the others in living cells?
A. Na
B. Mn
C. P
D. N
Answer- Mn
Q20. Which element has the nuclear configuration of 12/6?
A. carbon
B. oxygen
C. N
D. K
Answer- carbon
Q21. The symbol Na+ is used to describe a sodium _____.
A. atom
B. free radical
C. ion
D. molecule
Answer- ion
Q22. Of the following, which represents an organic compound?
A. H2O
B. O2
C. nitrous oxide
D. C6H12O6
Answer- C6H12O6
Q23. Whenever a partially charged hydrogen comes near a partially charged oxygen on another atom, a _____ bond is formed.
A. covalent
B. hydrogen
C. ionic
D. polar covalent
Answer- hydrogen
Q24. Water tends to dissociate, forming ions; which pH value indicates that the [H+] equals the [OH-]?
A. 6
B. 0
C. 7
D. 14
Answer- 7
Q25. Which of these is the correct formula for a strong base?
A. HCl
B. NaOH
C. H2SO4
D. H2O
Answer- NaOH
Q26. At what pH is a solution completely acidic? ____
A. 0
B. 7
C. 14
D. 7.4
Answer- 0
Q27. Protons all bear positive charges while neutrons have no net charge.
A. TRUE
B. FALSE
C. Nothing can be said
D. None of the mentioned
Answer- TRUE
Q28. Atoms such as sodium that are in the first column of the periodic table have positive charges.
A. TRUE
B. FALSE
C. Nothing can be said
D. None of the mentioned
Answer- FALSE
Q29. Elements that are radioactive isotopes react in similar chemical ways to their relatively stable counterparts, such as C12 and C1
A. TRUE
B. FALSE
C. Nothing can be said
D. None of the mentioned
Answer- TRUE
Q30. When sodium reacts with chloride usually a covalent bond is formed.
A. TRUE
B. FALSE
C. Nothing can be said
D. None of the mentioned
Answer- FALSE
Q31. Considering all molecules known, inorganic molecules usually contain fewer atoms that organic molecules.
A. TRUE
B. FALSE
C. Nothing can be said
D. None of the mentioned
Answer- TRUE
Q32. Technically speaking, HCl is the correct formula for a strong acid.
A. TRUE
B. FALSE
C. Nothing can be said
D. None of the mentioned
Answer- FALSE
Q33. In the biosynthesis of large molecules within the body, water is usually added to two or more molecules as they join together.
A. TRUE
B. FALSE
C. Nothing can be said
D. None of the mentioned
Answer- FALSE