The first law<span>, also known as </span>Law<span> of Conservation of </span>Energy<span>, states that </span>energy <span>cannot be created or destroyed in an isolated system.</span><span>
So answer 1</span>
Answer:
It converts energy in food into a more usable form. (Cellular Respiration-The enzyme-controlled process in which energy is released from food and converted into a form that the cell can use.)
Explanation:
A. M x L = moles.
<span>b. CH3COOH + NaOH ==> CH3COONa + H2O </span>
<span>I...6 mmols....0.......7.5 mmoles </span>
<span>C... 0........0.51 mmols..0 </span>
<span>E...6-0.511 ....0.......7.5+0.511 </span>
<span>I stands for initial </span>
<span>C stands for change. </span>
<span>E stands for equilibrium. </span>
<span>Just divide mmoles by 1000 to convert to moles. I work in mmoles because I get tired of writing those zeros. </span>
<span>c. done as in b.</span>
Answer:
tend to form ionic bonds by losing electrons making these atoms positive charge.
Explanation:
Transfer of electrons from one species to another species is called a redox reaction. it consists of one species that will give out electrons called an oxidation reaction and the other species take in electrons called reduction reactions. both these half equations together make up a redox reaction.
In oxidation, the oxidation state increases of the species that is oxidised.
In reduction, oxidation state of the species decreases of the species that is reduced.
1)
2AgNO₃(aq) + Cu(s) → Cu(NO₃)₂<span>(aq) + 2Ag(s)
single displacement reaction
oxidation number of Ag </span>decreases from +1 to 0 - reduction reaction
oxidation number of Cu increases from 0 to +2 - oxidation
since both oxidation and reduction reactions take place its a redox reaction.
2)
BaCl₂(aq) + Na₂CrO₄(aq) → BaCrO₄<span>(s) + 2NaCl(aq)
its a double displacement reaction and the ions have been exchanged.
Oxidation numbers of the elements do not change therefore this is not a redox reaction.
3)
</span>H₃PO₄(aq) + 3KOH(aq) → 3H₂O(l) + K₃PO₄<span>(aq)
acid base reaction where the oxidation state of the elements remain the same so its not a redox reaction.
4)
</span><span>CaCO</span>₃<span>(s) → CaO(s) + CO</span>₂<span>(g)?
decomposition reaction where the oxidation states remain the same hence not a redox reaction </span>