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Elenna [48]
4 years ago
14

Which highly reactive gas was probably absent from the Earth's primitive atmosphere?

Chemistry
1 answer:
KatRina [158]4 years ago
6 0
The answer is : oxygen gas
In primitive earth's era, (possibly billions years ago), the earth still has't filled with living organism as it is today. Many scientist predicted that it was filled with singular-cells anaerobic organisms , which do not need oxygen to live
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One way to determine the pH of a solution is to measure the concentration of the acid and base forms of the indicator colorimetr
ki77a [65]

Answer:

pH = 4.26

Explanation:

Bromocresol green is a commonly used pH indicator. The concentration ratio of the acid form to base form explains its color, which reflects the pH of the medium.

C₂₁H₁₄Br₄O₅S + H₂O ⇄ C₂₁H₁₃Br₄O₅S⁻ + H₃O⁺

      acid                       conjugate base

We can calculate the pH through Henderson-Hasselbalch's equation:

pH=pKa+log(\frac{[base]}{[acid]} )=4.66+log(\frac{1}{2.49} )=4.26

7 0
3 years ago
Large sharks eat many other marine life animals. The sharks and the animals they eat are all part of which level of organization
Law Incorporation [45]

Answer:

Community, ecosystem, population

Explanation:

6 0
3 years ago
Read 2 more answers
Tap water is a mixture. TRUE or FALSE.
Temka [501]
True, H2O is a compound with 2 hydrogens and one oxygen
7 0
3 years ago
A photon of light possesses 5 x 10^-19 J of energy. Calculate its frequency
saveliy_v [14]

Answer:

The frequency of photon is 0.75×10¹⁵ s⁻¹.

Explanation:

Given data:

Energy of photon = 5×10⁻¹⁹ J

Frequency of photon = ?

Solution:

Formula;

E = hf

h = planck's constant = 6.63×10⁻³⁴ Js

5×10⁻¹⁹ J =  6.63×10⁻³⁴ Js ×f

f =  5×10⁻¹⁹ J / 6.63×10⁻³⁴ Js

f = 0.75×10¹⁵ s⁻¹

The frequency of photon is 0.75×10¹⁵ s⁻¹.

4 0
3 years ago
Is 2 C4H10 + 13 O2 → 8 CO2 + 10 H2O a double replacement?
natulia [17]

Answer:

The answer to your question is No, it is not.

Explanation:

Data

                C₄H₁₀  +  13O₂   ⇒   8CO₂ +  10H₂O

In a double replacement reaction, two reactants interchange cations an example of these reactions are neutralization reactions. In neutralization reactions, an acid and a base react to form a salt and water.

The reaction of this problem is not a double replacement reaction because the products are carbon dioxide and water, not a salt and water.

The reaction of this problem is a combustion reaction.

8 0
4 years ago
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