Exams & Certification

All of the following statements about histamine are true except: Stimulates gastric acid secretion Causes constriction of bronchial smooth muscles Increases blood pressure Causes dilatation of capillaries The correct answer and explanation is: The correct answer is: Increases blood pressure. Histamine does not directly increase blood pressure. In fact, histamine is more likely to cause […]

LewisStructure3. In the Lewis structure of CBr, the C atom ___ has two double bonds only has four single bonds only has two single bonds, and one double bond only has three single bonds and one lone pair only The Correct Answer and Explanation is: In the Lewis structure of CBr₄, the C atom has

3.26 SeCl6 2-, TeCl6 2-, and ClF6 – are all octahedral, but SeF6 2- and IF6 – are distorted, with a lone pair on the central atom apparently influencing the shape. Suggest a reason for the difference in shape of these two groups of ions. (See J. Pilmé, E. A. Robinson, R. J. Gillespie, Inorg.

List four (4) WHS practices you need to be aware of when testing complex system faults to ensure you are safe. The correct answer and explanation is: When testing complex system faults, there are several Workplace Health and Safety (WHS) practices to ensure your safety: By adhering to these WHS practices, the risks involved in

What does the put provision for a bond entitle the bondholder to do? Answer a. Allow the bondholder to sell the bond with a premium b. Allow the bondholder to convert the bond to a put option c. Allow the bondholder to force the bond issuer to buy back the bond d. Allow the bondholder

Cole discovers a large piece of driftwood along the beach and realizes that there are two possible uses for it. What are they? The correct answer and explanation is: The two possible uses for the large piece of driftwood Cole discovers along the beach are: Explanation The driftwood found along the beach can serve as

IF6+ and IF6- both have an octahedral molecular shape (point group Oh). Draw Lewis structures for both including all valence electrons and formal atom charges. Based on Lewis and VSEPR theories, are the molecular geometries expected or unexpected?IF6+ and IF6- both have an octahedral molecular shape (point group Oh). Draw Lewis structures for both including

Arterial thrombi are composed of platelets and fibrin to produce a white clot. True False The correct answer and explanation is: True Arterial thrombi are indeed composed primarily of platelets and fibrin, which together form a “white clot.” The formation of arterial thrombi is usually triggered by damage to the blood vessel wall, leading to

Predict the approximate pH for aqueous Ba(NO3)2 solution. options: basic , neutral , acidic The correct answer and explanation is: The correct answer is neutral. Barium nitrate, Ba(NO3)2, is a salt formed from the reaction of a strong base, barium hydroxide (Ba(OH)2), and a strong acid, nitric acid (HNO3). When Ba(NO3)2 dissolves in water, it

Which of the following is NOT used to indicate evidence for evolution? 1. vestigial traits 2. fossils 3. naturalistic fallacy 4. genetic relatedness The correct answer and explanation is: The correct answer is 3. naturalistic fallacy. Explanation: Evolutionary evidence comes from a variety of sources, including vestigial traits, fossils, and genetic relatedness, but the naturalistic