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anzhelika [568]
3 years ago
15

How does a refracting telescope work?

Chemistry
1 answer:
Yakvenalex [24]3 years ago
7 0

Answer:

D

Explanation:

because convex lenses bend light inward

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How many molecules of Iron(II)oxide are present in 35.2*10^-23 g of Iron (II)oxide?
slava [35]

Answer:

R.F.M of Iron (II) oxide :

{ \tt{ = (56 \times 2) + (16 \times 3)}} \\  = 160 \: g

Moles :

{ \tt{ \frac{35.2 \times  {10}^{ - 23} }{160} }} \\  = 2.2 \times  {10}^{ - 24}  \: moles

Molecules :

{ \tt{ = 2.2 \times  {10}^{ - 24}  \times 6.02 \times  {10}^{23} }} \\  = 1.3244 \: molecules

4 0
3 years ago
Use bond energies from Table 10.3 in the textbook to estimate the enthalpy change (ΔH) for the following reaction. C2H2(g)+H2(g)
Digiron [165]

Answer: =176.6kJmol^{-1}

Explanation:Bond energy of H-H is 436.4 kJ/mole

Bond energy of  C-H is 414 kJ/mol

Bond energy of C=C is 620 kJ/mol

Bond energy of C≡C is 835 kJ/mol

\Delta H= {\text {sum of bond energies of reactants}}-  {\text {sum of bond energies of products}}

\Delta H= {1B.E(C≡C)+2B.E(C-H) +1B.E(H-H)} - {1B.E(C=C)+4B.E(C-H)}

\Delta H= {1B.E(835kJmole^{-1})+2B.E(414kJmole^{-1}) +1B.E(436.4kJmole^{-1})} -  {1B.E(620kJmole^{-1})+4B.E(414kjmole^{-1})}

=176.6kJmol^{-1}







7 0
4 years ago
EASYYYYY!!!!!!!!
nlexa [21]

crop rotation, green manure, and bone meal

Explanation:

I just looked it up. hope it helps

6 0
3 years ago
Meiosis happens in the major cells of multicellular organisms. true or false
olga55 [171]

Answer:

True.

Explanation:

Btw ya spelled mitosis wrong...

8 0
3 years ago
Why can we see the moon?
Svetlanka [38]

Answer: A. It reflects sunlight

hope this helps let me know if it's wrong

8 0
3 years ago
Read 2 more answers
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