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Lina20 [59]
3 years ago
8

A researcher discovers a new bacterium that lives on the seafloor near hydrothermal vents. This organism reduces CO2 to form C6H

12O6 (glucose), and also derives energy from H2 (by oxidation). This bacterium is a:
A. photoautotroph.
B. chemoheterotroph.
C. chemoautotroph.
D. photoheterotroph.
Chemistry
1 answer:
KonstantinChe [14]3 years ago
5 0

Answer:

C. Chemoautotroph

Explanation:

The new bacterium are able to create their own energy and biological materials  (glucose) from inorganic chemicals (CO2 and H2), therefore they are called chemoautotroph.

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3 years ago
A rubber ball is held 4.0 m above a concave spherical mirror with a radius of curvature of 1.5 m. At time equals zero, the ball
exis [7]

The time elapsed when the ball placed above the concave mirror and the image formed would be at the same location is 0.55 s.

<h3>Image distance</h3>

The position of the image formed is determined using the followimg mirror formula;

\frac{1}{f} = \frac{1}{v} + \frac{1}{u}

where;

  • f is the focal length of the mirror
  • v is the image distance
  • u is the object distance

f = R/2

f = 1.5/2

f = 0.75 m

When the ball and its image is in the same position, u = v

The position of the ball is calculated as;

\frac{1}{f} = \frac{1}{u} + \frac{1}{u} \\\\\frac{1}{f} = \frac{2}{u} \\\\u = 2f\\\\u = 2(0.75)\\\\u = 1.5 \ m

<h3>Time of motion of the ball</h3>

The time taken for the ball to travel the caluclated distance is determined as;

h = ut + ¹/₂gt²

1.5 = 0  + ¹/₂(9.8)t²

1.5 = 4.9t²

t² = 1.5/4.9

t² = 0.306

t = 0.55 s

Thus, the time elapsed when the ball and its image are at the same location is 0.55 s.

Learn more about concave mirror here: brainly.com/question/7512320

8 0
2 years ago
Define and explain sublimation and name the substance that sublime directly on heating​
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Answer:

Sublimation is the transition of a substance directly from the solid to the gas state, without passing through the liquid state. ... So, all solids that possess an appreciable vapour pressure at a certain temperature usually can sublime in air (e.g. water ice just below 0 °C).

I hope it's helpful!

7 0
2 years ago
PLEASE HURRY!!!! The diagram shows 2 identical charged particle. How does the potential energy and the force of repulsion change
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Answer:

Please did you ever get an answer??

Explanation:

Im doing usa test prep too and its really late

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3 years ago
The pigment cyanidin aglycone is one of the anthocyanin molecules that gives red cabbage (Brassica oleracea var. capitata f. rub
miskamm [114]

Hey there!

The pH range of a buffer is the pH window where in the uffer resists the changes in pH of the solution upon addition of small amounts of acid or base. Generally, the pH range of a buffer solution is equal to pKa ±1.

for this system :

ka= 1.3*10⁻⁷ , hence

pKa= - log (Ka)

pKa =  - log ( 1.3*10⁻⁷)

pKa = 6.88

Therefore, hence the buffer can be used in pH range of 5.88 to 7.88.


Hope that helps!

8 0
2 years ago
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