What is the significance of transitional metals relative to main group metals with regard to writing chemical formulas?

Which answer best describes the mechanism by which a catalyst increases the rate of a reaction?  The image below should be helpful.

Lyme disease originates from which reservoir of disease?

Convert 36.0 cubic centimeters (cm3) to cubic inches (in3).  Note, there are 2.54 cm per inch.  [HINT: Did your units cancel to give the desired unit?]

Which of the following induces (causes) fever?

How does the normal microbiota prevent disease?

Which of the following is NOT a direct protective outcome of anitgen-antibody binding?

Use of an antitoxin to treat poisonous snakebite (venom) is an example of which type of immunity/

Which of the following describes the parenteral route of infection?

What is the pH of a 2.5 M solution of acetic acid at equilibrium? (Balanced eq: HC2H3O2(aq) + H2O(l) + ⇌ H3O+(aq) + C2H3O2−(aq);  Ka of HC2H3O2 is 1.8 × 10−5  Note, X is much smaller than original concentration, therefore you do NOT need to perform the quadratic equation.  [Hint: What is the definition of pH?]