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lyudmila [28]
3 years ago
12

Which was briefly an anomaly in the fossil record of humans?

Chemistry
1 answer:
Goshia [24]3 years ago
8 0
Just because eyydtyyy
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100 POINTS 100 POINTS 100 POINTS 100 POINTS 100 POINTS 100 POINTS 100 POINTS 100 POINTS 100 POINTS 100 POINTS 100 POINTS 100 POI
pantera1 [17]

Answer:

2.2 moles

Explanation:

n = CV

n = 0.4×5.50

n=2.2 moles

5 0
2 years ago
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The scientific method typically ends with a ​
kifflom [539]

Answer: Conclusion

Explanation:

After they test the hypothesis they come to a conclusion of the answer.

and sometime test it again and again

7 0
3 years ago
How is a wound healing a chemical change? please explain ​
masya89 [10]

Answer:

its because fibrinogen is a chemical substance that builds up at the wound and gets hard by the action of air to prevent bleeding

5 0
3 years ago
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Determine if these molecules and ion are polar.
Colt1911 [192]

Answer:

a. Polar

b. Polar

c. Non-polar

d. Non-polar

Explanation:

a. H_3O^+, hydronium cation contains a positive charge. Just as any other ion, it is polar, as it has a net charge.

b. H_2S has the same shape as water. There are two lone pairs on sulfur atom which produce an overall dipole moment in this molecule, the bent structure is polar.

c. PCl_5 is non-polar, as the central atom, phosphorus, doesn't contain any lone pairs, all the dipole moments cancel out: two dipole moments in the vertical plane, P-Cl, and three P-Cl dipoles in the horizontal plane within a trigonal bipyramidal shape.

d. CF_4 is non-polar, since it's a tetrahedral molecule with no lone pairs on carbon atom, all four C-F dipole moments cancel out to yield a net 0 dipole moment.

3 0
3 years ago
A rock weighing 32.0 g is placed in in a graduated cylinder displacing the volume from 22.3 mL to 27.6 mL. What is the density o
mojhsa [17]
27.6 - 22.3 = 5.3; you simply subtract the old density from the new density.
5 0
3 years ago
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