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monitta
3 years ago
9

PLEASE HELP 5TH GRADE SCIENCE Select the statement that correctly compares the sun and a comet.

Chemistry
2 answers:
Dima020 [189]3 years ago
8 0

Answer:

C

Explanation:

The sun is in the center of the solar system, planets, comets, and other things orbit around it

Basile [38]3 years ago
3 0

Answer:

c

Explanation:

The sun is at the center of the solar system, and the comet orbits around it.

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Where on the periodic table are the majority of radioactive isotopes found?
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An Arrhenius base is a substance that increases the concentration of which ion in water solution?
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Hope this helps!
7 0
3 years ago
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Radioactive elements decay via first-order kinetics. consider a certain type of nucleus that has a rate constant of 2.4 × 10–2 h
Leokris [45]

Answer:

37.15 h.

Explanation:

  • The decay of radioactive elements obeys first-order kinetics.
  • For first-order reaction: <em>kt = lna/(a-x).</em>

where, k is the rate constant of the reaction <em>(k = 2.4 x 10⁻² h⁻¹)</em>.

t is the time of the reaction <em>(t = ??? day)</em>.

a is the initial concentration of nuclides <em>(a = 100 %)</em>.

(a-x) is the remaining concentration of nuclides <em>(a - x = 100% - 59% = 41.0 %)</em>.

<em>∴ kt = lna/(a-x)</em>

(2.4 x 10⁻² h⁻¹)(t) = ln(100.0%)/(41.0%).

(2.4 x 10⁻² h⁻¹)(t) = 0.8916.

<em>∴ t </em>= (0.8916)/(2.4 x 10⁻² h⁻¹) = <em>37.15 h.</em>

6 0
3 years ago
What increases the concentration of H+ in water ?
Tanzania [10]

Answer:

Acid

Explanation:

7 0
2 years ago
Read 2 more answers
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