Answer:
B
Explanation:
B
have cells with a cell wall and are heterotrophic
Answer:
Air is mostly gas
The air in Earth's atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen. Air also has small amounts of lots of other gases, too, such as carbon dioxide, neon, and hydrogen.
Explanation:
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Answer:
The reaction is endothermic
Part A: Yes because there is an immediate reaction of bubbling vigorously.
Part B: It releases energy because when the compounds are added together they are immediately releasing it by bubbling and turning cold.
Part C: Yes because the liquids inside when combined give off coldness that makes the liquid temperature decrease to use this chemical reaction could definitely be used to keep something cold
Explanation:
Answer:
pH = 4,70
Explanation:
For bromocresol, as HX is yellow and X⁻ is blue, the indicator will be a perfect green color when HX = X⁻.
Using Henderson-Hasselbalch formula:
pH = pka + log [X⁻]/[HX] <em>(1)</em>
Where pka is -log ka = -log2,0x10⁻⁵ = 4,70
As HX = X⁻, [HX] / [X⁻] = 1
Replacing in (1):
pH = 4,70 + log 1
pH = 4,70 + 0
<em>pH = 4,70</em>
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I hope it helps!
