<p>I've just started studying and I think there's a mistake.
On the chapter 1 review, number 23, with the energy diagram, I think none of the answers are true but the book says the answer is (A). Am I right? The reaction is exothermic right?</p>
<p>And in the answer explanation for number 28 states "That a substance occupies space and mass is the basic definition of all matter." shouldnt it be a "substance that occupies space and has mass?</p>
<p>Because you cannot occupy mass, I think</p>
<p>I know what you're talking about.. When I saw that question I thought it was Exothermic too.. but it wasn't any of the choices... I was like ***.. and can anyone else confirm whether its a mistake or not.</p>
<p>23 answe is definately wrong</p>
<p>bet the farm on it!!</p>
<p>^^ excuse my poor spelling on above post... it is hard on the eyes</p>