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Nadya [2.5K]
3 years ago
9

Gina made a poster for plastic recycling week and included this information on her poster:

Chemistry
2 answers:
Aloiza [94]3 years ago
8 0

Answer:

Gina Should Put Rubber Tires Under The  Synthetic Category

Gina Should Put Starch Under The Natural Category

Explanation:

Edge 2020

IgorLugansk [536]3 years ago
3 0

Answer:

Gina Should Put Rubber Tires Under The  Synthetic Category...(C)

Gina Should Put Starch Under The Natural Category...(D)

Explanation:

hope this helps. the person above me is also correct

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What was the half-life of a new isotope?
REY [17]
The half-life of any substance is the amount of time taken for half of the original quantity of the substance present to decay. The half-life of a radioactive substance is characteristic to itself, and it may be millions of years long or it may be just a few seconds.

In order to determine the half-life of a substance, we simply use:
t(1/2) = ln(2) / λ

Where λ is the decay constant for that specific isotope.
8 0
3 years ago
C55H72MgN4O5. How many atoms are in this molecule?
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There are 137 atoms in this molecule. C55 + H72 = 127. 127 + Mg (one atom of magnesium = 128. 128 + N4 = 132. 132 + O5 = 137.
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3 years ago
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5 0
3 years ago
Cobalt-63 has a half-life of 5.3 years. If a pellet that has been in storage for 15.9 years contains 40.0g of Cobalt-63, how muc
Cerrena [4.2K]

Answer:

320 g  

Step-by-step explanation:

The half-life of Co-63 (5.3 yr) is the time it takes for half of it to decay.  

After one half-life, half (50 %) of the original amount will remain.  

After a second half-life, half of that amount (25 %) will remain, and so on.  

We can construct a table as follows:  

  No. of               Fraction         Mass

half-lives   t/yr   Remaining   Remaining/g

      0        0              1

      1         5.3           ½

     2        10.6           ¼

     3        15.9           ⅛                 40.0

     4        21.2           ¹/₁₆

We see that 40.0 g remain after three half-lives.

This is one-eighth of the original mass.

The mass of the original sample was 8 × 40 g = 320 g

5 0
3 years ago
An organism that contains chloroplasts is able to produce food by the process of
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<span>An organism that contains chloroplasts is able to produce food by the process of "Photosynthesis"

Hope this helps!
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3 years ago
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