Answer:
negitive 5 or -5
Explanation
usally 12-7 = 5 but 7 is first so it you turn 5 to negitive 5
or -5
Answer:
Ví dụ về tính chất hóa học bao gồm tính dễ cháy, tính độc, tính axit, khả năng phản ứng (nhiều loại) và nhiệt của quá trình cháy.
Explanation:
<span>Triethylamine is only slightly soluble in water above 18.7 degrees Celsius!</span>
B. Fossil
Why? Well skeleton seems like another answer BUT the definition of a fossil is an imprint of an organism on rock.
Example: A dinosaur presses it’s foot in dirt and it leaves a footprint or ‘fossil’ behind
Answer is: pH of a buffer is 4.64.
ck(CH₃COOH) = 0.45 M.
cs(CH₃COONa) = 0.35 M.
Ka = 1.8·10⁻⁵.
<span>pKa = -logKa.
</span>pKa = -log(1.8·10⁻⁵) = 4.75.
<span>Henderson–Hasselbalch equation: pH = pKa + log(cs/ck).
</span>pH = 4.75 + log(0.35M/0.45M).
pH = 4.75 - 0.11.
pH = 4.64.
pH (potential of hydrogen) is a numeric
scale used to specify the acidity or basicity an aqueous solution.
