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Yanka [14]
3 years ago
6

What partie is found outside of the nucleus​

Chemistry
2 answers:
77julia77 [94]3 years ago
3 0

Answer:

Electrons

Explanation:

polet [3.4K]3 years ago
3 0

Answer:

electrons

Explanation:

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When 0.103 g of Zn (s) is combined with enough HCl to make 50.0 mL of solution in a coffee cup calorimeter, all of the zinc reac
lbvjy [14]

Answer:

\Delta H_{rxn}=162940 J/mol

Explanation:

To calculate the heat of reaction we need to determine:

  1. The heat produced
  2. The moles of Zn that reacted

<u>Moles of zinc (Zn)</u>

It says that the 0.103 g reacted completely, knowing that the Zn molecular weight is 65.4 g/mol:

n_{Zn}=\frac{0.103g}{65.4 g/mol}=1.57*10^{-3}mol

<u>Heat released by the reaction</u>

The solution goes from 22.5 °C to 23.7°C:

Q=Cp*\rho *V*(T_f - T_i)

Q=4.18 \frac{J}{g* ^{\circ}C}*1.02 g/mL*50mL*(23.7-22.5)^{\circ}C

Q=255.8 J

<u>Heat of reaction</u>

\Delta H_{rxn}=\frac{-Q}{n_{Zn}}

\Delta H_{rxn}=\frac{-255.8 J}{1.57*10^-3}}=162940 J/mol

7 0
3 years ago
What mass of Ca(OH)2 is contained in 1500 mL of 0.0250 M Ca(OH)2 solution?
Paraphin [41]

We need moles of Ca(OH)_2

  • Molarity=Moles/Volume in L
  • 0.025=Moles/1.5
  • Moles=1.5(0.025)
  • Moles=0.0375mol

Molar mass of Ca(OH)_2=74g/mol

Now

  • Mass=Molar mass×Moles
  • Mass=0.0375×74
  • Mass=2.77g

Option C

5 0
2 years ago
A gaseous substance turns directly into a solid. Which term describes this change?
Komok [63]

Answer:

evaporation or sublimation

4 0
3 years ago
Read 2 more answers
Why is the amount of usable energy lower for anaerobic respiration than for aerobic respiration
photoshop1234 [79]
Anaerobic is when there is not enough oxygen for aerobic respiration, so it uses glucose and lactic acid for example instead of glucose and oxygen for aerobic. Anaerobic takes longer to convert to energy. 
3 0
3 years ago
Which balanced equation represents a redox reaction?
nlexa [21]

Answer: option (3) CuO + CO ⇄ Cu + CO₂


Explanation:


1) A redox reaction is an oxidation-reduction reaction.


2) An oxidation-reduction reaction is one in which at least one species is oxidized and other (or others) is reduced.


3) Oxidation is the increase on the oxidation number, which occurs by releasing electrons.


4) Reduction is the decrease of the oxidation number, which occurs by gaining electrons.


5) By looking at the oxidation numbers of the reactants and the products you can tell whether a reaction is a redox one.


6) There are some rules to calculate the oxidation states which you need to handle to determine the oxidation states of the atoms in any chemical formula.


7) The main rule that you can use at a glance is if an element is alone in one side of the equation and is bonded to other kind of atom in the other side.


That is because the rule states that for any element that is not combined with other element its oxidation state is 0.


In this case, you can apply that rule to the equation of the choice number (3). In that, you can see that Cu is pure which as per the mentioned rule means that its oxidation state is 0.


As Cu is combined with O, CuO, in the reactant side of the chemical equation, then its oxidation number is not 0. Indeed, the rule is that in the formula CuO the oxidation states of Cu and O add up 0, and since the oxidation number of O is 2-, the oxidation number of Cu is 2+.


Therefore, having Cu changed its oxidation state from 2+ to 0, it was reduced, and this is a redox reaction.


Of course other atoms had to be oxidized. It was C whose oxidation state went from 2+ in CO to 4+ in CO₂.

7 0
3 years ago
Read 2 more answers
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