This would be true for dimensional analysis / Stoichiometry questions
Answer:
B
Explanation:
Chemical changes would mean changes that does not change in the form of matter.
A) water freezing in a pond is liquid to solid, so form of matter change, so it cannot be this one.
C) A tree buming is solid to gas, so form of matter change, so it cannot be this one.
D) Steam rising from pavement is solid to gas, so for of matter change, so it cannot be this one.
On the other hand B, the matter stays in the same form, solid.
Tree branch to a tree branch.
Earthquakes is a consequence
Answer:
A
Explanation:
Lanthanides share the following common properties: Silvery-white metals that tarnish when exposed to air, forming their oxides. Relatively soft metals. Hardness increases somewhat with higher atomic number.
Answer:
<em>The correct option is a) Precipitate: silver sulfate
</em>
<em>
</em>
<em>Net Ionic: 2Ag+ + SO42 →Ag2SO4</em>
Explanation:
When sodium sulfate reacts with silver nitrate, the following reaction occurs:
2AgNO3 + Na2SO4 → Ag2SO4 + 2NaNO3
The NaNO3 is easily soluble in water. However, silver ions form an insoluble solid with SO4. The Ag+ in this compound will be a cation having a positive charge. The SO4- will be an anion having an negative charge.
The table with solubility rules show that the sulfates of Ag+, Ca+, Sr2+, Ba2+, Hg22+ and Pb2+ are insoluble.
