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3 years ago

8

Which pair of elements would you expect to exhibit the greatest similarity in their physical and chemical properties? o,s si, p?

1 answer:

aliya0001 [1]3 years ago

8 0

I believe the appropriate pair is O and S, Periodic table represents arrangements of elements ordered by their atomic number,physical and chemical properties. Both sulfur and oxygen are in the same group of the periodic table (group 6), they have a valency of 2, This means they have a greater similarity in chemical and physical properties.

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(a) what product or products would you expect to obtain by the addition of bromine to cis-cinnamic acid, assuming that it reacts

Free_Kalibri [48]

If the totaling of bromine to cis-cinnamic acid uses the same mechanism or device as the addition to trans-cinnamic acid, addition of bromine only transpires on the top (syn) and not the bottommost face (anti). Therefore, bromine added to cis-cinnamic only adds to the same face (syn addition) as a result producing only threo dibromides.

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3 years ago

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3 years ago

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What category is most of the elements part of

rjkz [21]

Answer:

transition metals

Explanation:

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3 years ago

What mass of iron is formed when 10 grams of carbon react with 80 grams of iron iii oxide?

yKpoI14uk [10]

Answer:

55.85 grams of Fe is formed.

Explanation:

Identify the reaction:

2Fe₂O₃ + 3C → 4Fe + 3CO₂

Identify the limiting reactant, previously determine the mol of each reactant

(mass / molar mass)

10 g / 12 g/m = 0.83 moles C

80 g / 159.7 g /m = 0.500 moles Fe₂O₃

2 moles of oxide need 3 moles of C, to react

0.5 moles of oxide, will need ( 0.5 . 3)/ 2 = 0.751 mol

I have 0.83 moles of C, so C is the excess.

The limiting is the oxide.

3 mol of C need 2 mol of oxide to react

0.83 mol of C, will need (0.83 . 2)/ 3 = 0.553 mol of oxide, and I only have 0.5 (That's why Fe₂O₃ is the limiting)

Ratio is 2:4 (double)

If I have 0.5 moles of oxide, I will produce the double, in the reaction.

1 mol of Fe, will be produce so its mass is 55.85 g

5 0

3 years ago

A cup of coffee (140g) cools from 75°C down to comfortable room temperature 20°C. How much energy does it release to the surroun

Thepotemich [5.8K]

Given that the mass of coffee in the cup = 140 g

Final temperature = $20^{0}C$

Initial temperature = $75^{0}C$

Let us assume the specific heat of coffee is equal to that of water = 4.184 $\frac{J}{g^{0}C }$

Temperature change = T(final) - T(initial) = (20 - 75 ) $^{0}C$

=- 55 $^{0}C$

-Heat given out by coffee = heat absorbed by the surroundings

Heat released into the surroundings =-( $mC(T_{final}-T_{initial})$ )

= $-(140g)4.184\frac{J}{g^{0}C }( -55^{0}C)$

= 32,217 J

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4 years ago