Barrons Chemistry Test #1

Test Preparation SAT Subject Test Preparation
1

<p>I disagree with one of the answers given to a question.</p>

<p>Practice test 1, #111, page 296. they say 13/12 C and 12/12 C are isotopes of the element carbon.</p>

<p>Actually the atomic number 12 represents Magnesium; thus proving that the before mentioned are NOT isotopes of carbon, making the first statement blatantly false.</p>

<p>I'm so proud of myself :D.</p>

<p>Can anyone confirm this?</p>

<p>Thanks</p>

<p>(btw whats a good score on a barrons test if you're aiming for 780-800)</p>

2

<p>bump 10 char..any thoughts anyone?</p>

3

<p>You're right that 13/12 C does not exist. i think they meant 13/6 C and 12/6 C, in which case the statement would be true. Good job!</p>

4

<p>aha! i found one more error</p>

<h1>55, page 300</h1>

<p>40 g of NaOH, made 1 L of solution. whats the molarity</p>

<p>40 g NaOH=1 mol NaOH
1/1=1 M!</p>

<p>they said the answer is .25 M</p>

<p>also can anyone give me a better explanation for #35 and #44</p>

<p>Thanks</p>