Answer:
cells, like plants and animals, also have membrane-bound nuclei and organelles (e.g., mitochondria, cytoplasmic curriculum, lysosomes). Cheek cells, like other squamous cells in animals, appear scale-like under the microscope.
Hope this helps!! if it does...
Well I think it’s B but I hope I’m not wrong
(See full question in attachment)
Answer:
A. MeONa
Explanation:
One of the methods to prepare alkenes are eliminations.
The E2 reaction (for elimination, bimolecular) occurs when an alkyl halide is treated with a strong base, such as hydroxide ion or alkoxide ion (RO⁻).
It is the most common mechanism that occurs for an elimination.
The methoxide ion is a strong base that will attack the neighboring hydrogen of the halide ion and will start removing H⁺ at the same time that the double bond of the alkene begins to form and the group X begins to leave.
Then, the neutral alkene is produced when the C – H link and X group has left with the electron pair of the bond C – X (mechanism in attachment).
Therefore, MeONa would be an appropiate reagent.
Answer:
D. First, put the specimen into focus using a low power lens, then switch to a higher power lens, if needed.
Explanation:
The microscope is a delicate and very useful and necessary instrument in a laboratory. For this reason, it must be used with care and responsibility so as not to compromise its operation.
To use a microscope it is necessary, first, that the sample to be observed is prepared. After that, you must turn on the device and place the sample in the appropriate place and try to focus the image using the low power objective lens. When the image is properly focused, you can use the high-power lens.
Answer:
All the above are true.
Explanation:
State functions are properties whose values do not depend on the specific path/steps taken to obtain their values. Thus, the first statement is true.
The value of ΔErxn can be estimated using the constant volume calorimetry. This statement is also true.
Energy can neither be created nor destroyed but can be converted from one form to another (law of conservation of energy). This statement is also true.
The value of ΔHrxn can also be estimated using the constant pressure calorimetry. This statement is also true.
Therefore, all the statements are true. All the above are true.