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ankoles [38]
2 years ago
9

Renewable resources are considered clean because they don't cause what

Chemistry
1 answer:
AfilCa [17]2 years ago
7 0

Answer:

I think maybe carbon ?

Explanation:

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Platinum-189<br> What is the symbol
Fed [463]

Answer:

platinum-189 symbol is PT

6 0
2 years ago
Calculate the number of joules released when 0.64 grams of steam (c = 2.04 l/g
allochka39001 [22]
The number  of  joules  released  when  0.64g  of   steam  are  cooled  from 125 c  to 105  c is  -26.112  joules

      calculation
by  use of Q=MCΔ T  formula  calculate the  joules released  where
Q( heat) =?
M (mass) =  0.64 g
C (specific heat capacity = 2.04 j/g/c
ΔT(change  in temperature) =  105-125 =-20c

Q  is  therefore = 0.64 g   x2.04 j/g/c x -20  c = -26.112  joules

it  is okay  to have negative value  since  the  reaction   is exothermic that  is heat  is  released


7 0
3 years ago
How many molecular orbitals are present in the valence band of a sodium crystal with a mass of 4.14 g
Neko [114]

Answer:

Explanation:

Given that:

The mass of sodium crystal = 4.14 g

As a result, the number of atoms in the sodium crystal is:

=4.14 \g \times \dfrac{ 1 \ mol}{23.0 \ g }\times \dfrac{6.023 \times 10^{23} \ atoms}{1 \ mol}

= 1.084 × 10²³ atoms

In the valence orbital of the sodium atom, there is just one electron.

As a result, the number of molecular orbitals produced by these atoms is= 1.084 × 10²³ molecular orbital

Because valence bands are created from occupied molecular orbitals, the number of valence bands created from the aforementioned molecular orbitals is:

= \dfrac{ 1.084 \times 10^{23}}{2}

= 5.420 × 10²² orbitals.

6 0
2 years ago
On hot days, you may have noticed that potato chip bags seem to “inflate”, even though they have not been opened. If I have a 25
Taya2010 [7]

The new volume of the bag : 747.43 ml

<h3>Further explanation</h3>

Charles's Law  

When the gas pressure is kept constant, the gas volume is proportional to the temperature  

\tt \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}

V₁=250 ml

T₁=19+273=292 K

T₂=600+273=873 K

\tt V_2=\dfrac{V_1.T_2}{T_1}\\\\V_2=\dfrac{250\times 873}{292}\\\\V_2=747.43~ml

7 0
3 years ago
a blood sample analysis showed a total of 0.00467g lead. what is the result if it is expressed in micrograms?​
artcher [175]

Answer:

4670 micrograms

Explanation:

7 0
2 years ago
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