Answer:
B) The group the atom is located
C) There needs to be 2 Na atoms and 1O atom to form Na2O
Answer:
The independent variable is the type of material
The dependent variable is the thermal energy transferred by that material
Explanation:
The type of material is independent of the heat flowing through it. While the thermal energy transferred is surely dependent on the material through which it transfers.
The net upward force that a fluid exerts on an immersed object. The ratio of force to the area over which that force is distributed. More pressure the deeper you go
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>