1. given the reaction: ca + 2 h2o → ca(oh)2 + h2 how many moles of water are needed to react completely with 2.0 moles of ca?

a. 1.0 moles b. 2.0 moles c. 0.5 moles d. 4.0 moles

2. fe + h2so4 → feso4 + h2 is an example of

a. single displacement b. synthesis c. double displacement d. decomposition

3. hydrazine, n2h4 , and dinitrogen tetroxide, n2o4 react to form gaseous nitrogen and water. which of these represents a properly balanced equation for this reaction?

a. n2h4 +n2o4→ n2 +h2o

b. 2 n2h4 +n2o4 → 2 n2 +4 h2o

c. 2 n2h4 +n2o4 → 3 n2 +4 h2o

d. 2 n2h4 +3 n2o4 → 5 n2 +6 h2o

4. a 40% alcohol contains

a. 40 ml alcohol in 100 ml of water.

b. 40 ml alcohol in 60 ml of water.

c. 60 ml of alcohol in 100 ml of water.

d. 60 ml of alcohol in 40 ml of water.

Answers:

Question 1) d. 4 moles

question 2) a. single displacement reaction

question 3) c. 2N2H4 + N2O4 ==>3N2+4H2O

question 4) a. 40 ml alcohol in 100 ml water

when—without warning—something provokes your anger, you may struggle not to succumb to it. since what typically makes you mad is feeling powerless in the face of what seems unfair, your anger is mostly an attempt at a “quick fix” to right the balance. it’s as though you’re raising a fist in protest, proclaiming that you’re not going to capitulate to such injustice.

there are, however, a multitude of problems related to this immediate, push-back reaction of anger. and probably the key one is that almost never does it resolve the issue that gave rise to it. such reactive anger is probably best understood as self-defeating. as david burns, the author of the seminal self- book feeling good, observes: if realistically, acting on your anger is to make any sense, it needs to meet two criteria—which, in almost every case, is frankly impossible. that is, your anger must:

be directed toward a person who has intentionally (and needlessly) behaved in a hurtful way toward you; and

be beneficial or advantageous to you (i.e., assist you in achieving a desired goal).

i think you’ll agree that only rarely can you claim that your anger is both warranted and , whether to yourself or the relationship.

so let me offer you a two-step alternative to abandoning your better judgment and giving in to the temptation of anger—one that should neutralize your anger in seconds. or, when you’re really angry, in minutes.

but keep in mind that you must really want to execute these steps, be sufficiently motivated to perform them. which means overcoming more unconscious resistance than you might ever have imagined. because there are many immediate “advantages” of anger that can interfere with your resolve, i’ll suggest a few of them that might interfere with your employing this powerful method to rid yourself of counter-productive anger.

explanation:

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.