Pap er consists mainly of cellulose, a complex compound made up of simple sugars. Suggest a method for turning old newspapers into sugars using an enzyme. What problems would there be? What precautions would need to be taken?

What is the angle between two opposite rays?

Deimos is about 12 km in diameter and has a density of $2 \mathrm{g/cm}^3.$ What is its mass? (Hint: The volume of a sphere is $\frac{4}{3} \pi r^3.)$

Identify a pattern in each list of numbers. Then use this pattern to find the next number. (More than one pattern might exist, so it is possible that there is more than one correct answer.) 125, - 25, 5, - 1, ____

Solve each inequality. Express your answer using set notation or interval notation. Graph the solution set. |1 - 2x| > 3

For each of the following changes to the equilibrium system below, predict which reaction will be favored-forward (to the right), reverse (to the left), or neither.

$$\mathrm{H}_{2}(\mathrm{gas})+\mathrm{Cl}_{2}(\mathrm{gas}) \rightleftarrows 2 \mathrm{HCl}(\mathrm{gas})+\text { heat }$$

$$\begin{array}{l}{\text { a. addition of } \mathrm{Cl}_{2}} \\ {\text { b. removal of } \mathrm{HCl}} \\ {\text { c. increased pressure }} \\ {\text { d. decreased temperature }} \\ {\text { e. removal of } \mathrm{H}_{2}}\end{array}$$

Balancing Chemical Equations In 1774, Joseph Priestley discovered oxygen when he heated solid mercury(II) oxide, HgO, and produced the element mercury and oxygen gas. Write and balance this equation.

Find the value of each expression. |3|-|2|

Which of the following statements about free radicals is true? a. Free radicals form ionic bonds with other ions. b. Free radicals result from broken covalent bonds. c. Free radicals usually break apart to form smaller components. d. Free radicals bind molecules together.

When wood is burned, energy is released in the form of heat and light. Describe the reaction, and explain why this reaction does not violate the law of conservation of energy. Use the terms combustion, exothermic, and chemical energy.

Define the marginal social cost of pollution.

Find the vertex, focus, directrix, and axis of symmetry of each parabola. Then graph the parabola. You may wish to check your graphs on a computer or a graphing calculator. 4x=

$$y^2$$

-4y

Use modular arithmetic to determine each of the following. Disregarding A.M. or P.M., if it is now 5 o’clock, a. what time will it be 45 hours from now? b. what time was it 71 hours ago?

The school Ecology Club wants to fence in an area along the riverbank to protect endangered wildflowers that grow there. The club has enough money to buy. 200 feet of fencing. It decides to enclose a rectangular space. The fence will form three sides of the rectangle, and the riverbank will form the fourth side. a. If the width of the enclosure is 30 feet, how much fencing material is available for the length? Sketch this situation. What is the area? b. If the width is w, how much fencing material remains for the length, l? c. Use your answer from 11b to write an equation of the area of the rectangle in factored form. Check your equation with your width and area from 11a. d. Which two different widths would give an area equal to 0? e. Which width will give the maximum area? What is that area?