BaSO₄ is relatively harmless, but BaS is highly toxic.
BaSO₄ is quite insoluble (240 µg/100 mL). It is a <em>mild irritant</em> in cases of skin contact and inhalation. However, it is <em>safe enough</em> that health professionals ask patients to drink a suspension of BaSO₄. The Ba is opaque to X-rays, so it makes the stomach and intestines more visible to radiographers.
BaS is soluble (7.7 g/100 mL). It reacts slowly with water and more rapidly in the acid conditions of the stomach to <em>release H₂S</em>.
BaS + 2HCl ⟶ BaCl₂ + H₂S
An H₂S concentration of 60 mg/100 mL can be <em>fatal within 30 min</em>.
<em>Don’t eat barium sulfide!</em>
The daily mean, given the data from the question is 15 °C
<h3>Data obtained from the question</h3>
- Maximum temperature = 20 °C
- Minimum temperature = 10 °C
- Mean = ?
<h3>How to determine the daily mean </h3>
Mean = Sumation of data / Number of data
Mean = (20 + 10) / 2
Mean = 30 / 2
Mean = 15 °C
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The prefix "iso" is used when all carbons except one form a continuous chain. ... The prefix "sec" or "s" is used when the functional group is bonded to a secondary carbon.
Answer: 4.80 * 10¹⁴s⁻¹
Explanation:
Speed = Frequency * Wavelength
So:
Frequency = Speed/ Wavelength
Speed of light = 3 * 10⁸ m/s
Frequency = (3 * 10⁸ m/s) / (6.25 x 10⁻⁷m)
= 4.80* 10¹⁴hz
= 4.80 * 10¹⁴s⁻¹
