HRS - Ask. Learn. Share Knowledge. Logo

Questions in Grade College

[Done] A chemical substance that helps relay nerve impulses in the brain is called a(n) _______.

[Done] Help to rebalance the pH of the skin and remove product residue after cleansing. Choose only ONE best answer. A. Masks B. Packs C. Skin tonics D. Rolling creams

[Done] Rank these chemical species by increasing pH of an 0.1 M aqueous solution of each. That is, imagine making an 0.1 M solution of each species. Select 1 next to the species that makes the solution with the lowest pH. Select 2 next to the species that makes the solution with the next higher pH, and so on. Notice that some of the rankings have been filled in for you already. Also notice that water is on the list. For that particular case, just compare the pH of pure water to the pH of the other solutions. Note for advanced students: for all charged species, you may assume the necessary counterions act as neither acids nor bases. | species | relative pH of 0.1 M aqueous solution | | :-------------- | :-------------------------------------- | | [tex]$H _3 O ^{+}$[/tex] | 1 (lowest) | | [tex]$C _6 H _5 COOH$[/tex] | -3 | | [tex]$C _6 H _5 COO ^{-}$[/tex] | (Choose one) | | [tex]$HONH _2$[/tex] | 8 (highest) | | [tex]$HONH _3{ }^{+}$[/tex] | (Choose one) | | HCOOH | 2 | | [tex]$HCOO ^{-}$[/tex] | (Choose one) | | [tex]$H _2 O$[/tex] | (Choose one) |

[Done] Solve the following equation: [tex]$4 x^2+40 x+100=0$[/tex]

[Done] Select the correct answer. During the summer, Jody earns $10 per hour babysitting and $15 per hour doing yardwork. This week she worked 34 hours and earned $410. If $x$ represents the number hours she babysat and $y$ represents the number of hours she did yardwork, which system of equations models this situation? A. $\begin{array}{l}x+y=34 \\ 10 x+15 y=410\end{array}$ B. $x+y=410$ $10 x+15 y=34$ C. $x+y=34$ $15 x+10 y=410$ D. $x+y=410$ $15 x+10 y=34$

[Done] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Done] Son aquellos que mediante argumentos intentan influir, convencer o inducir al receptor a realizar lo que el emisor desea. Seleccione una: A. Textos Dramaticos B. Textos Persuasivos C. Textos Argumentativos D. Ninguno de los anteriores

[Done] Why were the Stono Uprising rebels moving toward Florida? A. To get to Fort Moses B. No particular reason; it was haphazard C. There were more plantations they could raid in that direction D. There was a big concentration of militia north of them whom they wanted to avoid

[Done] In the lecture, you were introduced to NAEYC's Principles of Effective Family Engagement. There are 6 principles covering effective engagement practices. In your initial post, address the following prompts: Briefly explain each principle in your own words. Choose two of the principles and describe one strategy for each that you could execute in your EC classroom to support family engagement. If you need a refresher on the principles, click on the following link: NAEYC's Principles of Family Engagement.

[Done] What occurs during cytokinesis? A. The cells grow, store up energy, and take in nutrients, so mitosis can begin. B. The new chromosomes align at the center of the cell then separate, so the DNA can shift toward the ends of the cell. C. The original nuclei, cytoplasm, organelles, and cell membrane are divided into two "daughter" cells. D. The enzymes in the cell are manufactured, the DNA is replicated, and a parent cell is created.