Which of the following statements correctly describes the properties of ethylene? Select one:
a. The H-C-H bond angles are approximately 109.5º.
b. There are a total of 6 sigma bonds.
c. The C-C bond is shorter and stronger than the C-C bond in ethane.
d. The C-C bond is free to rotate.
Which of the following statements correctly describes the properties of ethylene? Select one: a. The H-C-H...
A) H20 c) нсоз- E) H2CO3 DOH. 22) Which of the following statements correctly describes the hydronium-hydroxide balance in the given solution? A) In acids, [OH-] is greater than [H3O* B) In bases, [OH-]- [H3o*]. C) In neutral solutions, [H3O"] = [H20]. D) In bases, [OH-] is greater than [H3o*]. E) In bases, [OH-] is less than [H30*]. 23) Which of the following is a buffer system? A) NaCl(aq) and NaNO3(aq) C) H2CO3(aq) and KHCO3 (aq) E) H20(0) and HCl(aq)...
Pork Which one of the following statements correctly describes telomerase"? Select one: a. Telomerase uses the DNA as a template for synthesizing a new strand. b. Activity of this enzyme is inhibited in many cancerous cells. c. It creates repetitive DNA at the end of the chromosomes, d. This enzyme is active in all dividing cells. In the 1953 article where Watson and Crick describe the structure of DNA, they make reference to a possible copying mechanism for the molecule....
Which of the following statements correctly describes the general reactivity of alkynes? A) An alkyne is an electron-rich molecule and therefore reacts as a nucleophile.B) The σ bonds of alkynes are higher in energy than the π bonds and are thusmore reactive. C) Unlike alkenes, alkynes fail to undergo electrophilic addition reactions. D) Alkynes are generally more reactive than alkenes. E) Alkynes react as electrophiles, whereas alkenes reacts as nucleophiles.
5. Which of the following statements correctly describes the molecule shown below? CH H A) It is achiral. B) It is meso. C) Its asymmetric center possesses the R configuration. D) The mirror image of this molecule is its enantiomer. E) The molecule possesses enantiotopic hydrogens.
Evaluate the following statements, and select those that correctly apply to the properties of microscopes. When observing specimens with the 100x lens, adding a drop of oil to the slide will improve the resolving power; the image will be clear rather than blurry. If oil is not used with the 100x lens, the virtual image will be less bright, compared to specimens observed with a drop of oil on the slide. The degree of contrast between a specimen and its...
Which of the following statements correctly describes the relationship between the resistance of a resistor and its physical volume? Select one: a. Resistance always decreases with increasing volume b. Resistance always increases with increasing volume c. Resistance always remains constant with increasing volume d. Resistance may decrease or increase depending on whether the area or length is increasing respectively A carbon composition variable resistor may become electrically noisy due to: Select one: a. High humidity b. Low humidity c. Mechanical...
The following reaction mechanism contains error. Which of the following statements correctly describes the curved arrows consistent with the reaction? CH3CH2CH2OH +Na NH2 - CH3CH2CH20 Na + NH3 The curved arrow should start at the carbon atom of C-O-H There should be one more arrow. Another curved arrow should start at the oxygen atom of the OH The curved arrow should start at the oxygen atom of the OH, not hydrogen of the OH The curved arrow should start from...
Which of the following statements correctly describe the properties of glucose and fructose? Choose one or more: OA. Glucose is found in at least three common disaccharides found in nature, while fructose is a component of only one. B. Glucose and fructose are both hexose sugars. C. Glucose and fructose are both reducing sugars. D. Glucose can form furanose and pyranose ring structures, while fructose can o only form a furanose ring
Which of the following statements correctly describe the properties of glucose and fructose? * Choose one or more: O A. Glucose can form furanose and pyranose ring structures, while fructose can only form a furanose ring. B. Glucose and fructose are both hexose sugars. O C. Glucose is found in at least three common disaccharides found in nature, while fructose is a component of only one. D. Glucose and fructose are both reducing sugars.
If K> 1, which of the following statements correctly describes E°? E>0 Under which of the following situations does E E o2 A When Q<1 B When Q>1 C When Q<0 D WhenQ 1