Lungs carry out an excretory function.
Which body cavity protects the central nervous system?
What is the serous membrane that covers the intestines called? peritoneum
Kinetic energy is energy in action, while potential energy is stored energy.
Structurally variant atoms, which have the same number of protons (and electrons), but differ in the number of neutrons they contain
Atomic weight of an element is approximately equal to the mass number of its most abundant isotope.
is based on the concentration of H+ ions.
Which of the following is not a subatomic particle? - molecule
The bond formed when shared electrons occupy a single orbital common to both atoms within a molecule.
Isotopes of the same element have the same atomic number but differ in their atomic masses.
The atomic weight is only an average of relative weights of an atom and its isotopes, and it may vary from the weight of a specific isotope.
Which of the following is not one of the three major types of chemical reactions? Hyperbolic
Which of the following is not one of the three basic steps involved in enzyme activity? Because their catalytic role renders most enzymes ineffective after their initial activity, a cell must produce large amounts of each enzyme in order to perform effectively
Select the statement about mixtures that is correct.
A solution contains solvent in large amounts and solute in smaller quantities
What are the two fundamental roles of DNA?
To direct protein synthesis, and replicate itself before cell division.
Organic compounds are covalently bonded and they always contain oxygen.- False
What type of chemical bond does sodium, element 11, form with chlorine, element 17? -ionic bond- sodium has a atomic number of 11- and 1 electron on its shell-loses one so the second shell is stable. Chlorine has a atomic number of 17- accepts sodium electron
0=0 means double bond
What is a dipole? a polar molecule
Which bonds often bind different parts of a molecule into a specific three-dimensional shape? Hydrogen
Covalent bonds are generally less stable than ionic bonds. False
Hydrogen bonds are comparatively strong bonds.- false
Which of the following is an example of a decomposition reaction? MgO2 → Mg + O
A chemical reaction in which bonds are broken is usually associated with.. the release of energy
Amino acids joining together to make a peptide is a good example of a(n) ________ reaction - synthesis
Mrs. Mulligan goes to her dentist and, after having a couple of cavities filled, her dentist strongly suggests that she reduce her intake of sodas and increase her intake of calcium phosphates in the foods she eats. Why? Sodas are strong acids that can dissolve the calcium phosphate in bone and teeth.
Why is it possible to safely drink a solution that contains a 50:50 mixture of equal concentrations of a strong acid and a strong base, either of which, if ingested separately, would be very caustic and damaging? Salt and water are formed when a strong acid and base are mixed.
A 65-year-old patient came to the emergency room with complaints of severe heartburn unrelieved by taking a "large handful" of antacids. Would you expect the pH to be relatively high, low, or normal for the patient's stomach contents, and why? The pH would be high. Antacids are basic, and too many antacids would result in a relatively alkaline state
Buffers are essential for stabilizing the pH of body fluids. The pH of blood is stabilized by naturally occurring buffers.
What is the most abundant and important inorganic compound in living material? Water
Which of the following is a neutralization reaction?
Which property of water is demonstrated when we sweat? high heat of vaporization
Buffers resist abrupt and large changes...