Why can’t the elements of a compound be separated from one another by physical means?

What is energy? What is work? List some examples of each.

In testing for carbon monoxide in a certain brand of cigarette, the data, in milligrams per cigarette, were coded by subtracting 12 from each observation. Find the standard deviation for the carbon monoxide content of a random sample of 15 cigarettes of this brand if the coded measurements are 3.8, −0.9, 5.4, 4.5, 5.2, 5.6, 2.7, −0.1, −0.3, −1.7, 5.7, 3.3, 4.4, −0.5, and 1.9.

Find an explicit formula for the arithmetic sequence of 12,5,-2,-9

Read the store’s ad. Then answer the following questions in complete sentences:

1. ¿Qué ropa venden en la tienda?
2. ¿Cuánto cuestan las chaquetas?
3. ¿Por qué la tienda no tiene pantalones cortos?

The pH of a chemical solution is given by the formula $\mathrm{pH}=-\log _{10}\left[\mathrm{H}^{+}\right]$ where $[\mathrm{H}^{+}]$ is the concentration of hydrogen ions in moles per liter. Values of pH range from 0 (acidic) to 14 (alkaline). What is the pH of a solution for which $\left[\mathrm{H}^{+}\right]$ is 0.001?

What are the negative singular command forms of the following verbs?
-escuchar -comer -dormir -tomar -hablar -beber -salir -jugar

Find the real solutions of each equation by factoring. $x^{4}-x^{2}=0$

Gulig and Doherty, a law firm, started 2012 with accounts receivable of $26,000 and an allowance for uncollectible accounts of$2,000. The 2012 service revenues on account totaled $183,000, and cash collections on account totaled$133,000. During 2012, Gulig and Doherty wrote off uncollectible accounts receivable of $2,500. At December 31, 2012, the aging of accounts receivable indicated that Gulig and Doherty will not collect$1,790 of its accounts receivable. Journalize Gulig and Doherty’s (a) service revenue, (b) cash collections on account, (c) write-offs of uncollectible receivables, and (d) uncollectible-account expense for the year. Explanations are not required. Prepare a T-account for Allowance for Uncollectible Accounts to show your computation of uncollectible-account expense for the year.

On a separate sheet of paper, explain the following term by using it correctly in a sentence. confederation

If f is a one-to-one function and $f(3)=8,$ then $f^{-1}(8)=$ _____.

Do you think First Amendment rights should ever be restricted? In what kinds of situations should this occur?

Evaluate $\int_{0}^{\pi} f(x) d x$ where

$$f(x)=\left\{\begin{array}{ll}{\cos x} & {\text { if } 0 \leq x<\frac{\pi}{2}} \\ {x} & {\text { if } \frac{\pi}{2} \leq x \leq \pi}\end{array}\right.$$

Verify the particular solution of the differential equation. Solution: y = sin x cos x - cos² x Differential Equation and Initial Condition: 2y + y’ = 2 sin(2x) - 1 y(π/4) = 0