D because 0 is always ignorant in significant figures. hope that helps:)
Answer:
Yes. Ca²⁺(aq) + SO₄²⁻(aq) ⟶ CaSO₄(s)
Step-by-step explanation:
The possible reaction is
CaI₂ + Na₂SO₄ ⟶ CaSO₄ + 2NaI
To predict a reaction, you must know <em>the solubility rules</em>.
The important ones for this question are
- Salts containing Na⁺ are <em>soluble</em>. Thus, NaI is soluble.
- Most sulfates are soluble, but CaSO₄ is not. Thus, CaSO₄ is a precipitate, and a reaction occurs.
Molecular equation
CaI₂(aq) + Na₂SO₄(aq) ⟶ CaSO₄(s) + 2NaI(aq)
Ionic equation
Ca²⁺(aq) + <u>2I⁻(aq)</u> + 2Na²⁺(aq) + SO₄²⁻(aq) ⟶ CaSO₄(s) + 2Na⁺(aq) + 2I⁻(aq)
Net ionic equation
Cancel all ions that appear on both sides of the reaction arrow (underlined).
Ca²⁺(aq) + <u>2I⁻(aq) </u>+ <u>2Na²⁺(aq)</u> + SO₄²⁻(aq) ⟶ CaSO₄(s) + <u>2Na⁺(aq)</u> + <u>2I⁻(aq)
</u>
The net ionic equation is
Ca²⁺(aq) + SO₄²⁻(aq) ⟶ CaSO₄(s)
Answer:
Explanation:When silver Ag metal is added to copper sulphate CuSO4 solution, no reaction takes place as silver is less reactive than that of copper and cannot displace copper from its solution. Hence, when a piece of silver metal is added to copper sulphate solution there will be no reaction.
We need the IUPAC name of the given compound.
The IUPAC name is: Hexan-3-imine.
The molecule has six carbon atoms in its skeleton. C=NH bond is attached to the skeleton at 3-position.
The functional group present in this molecule is imine (C=NH).
Answer:
Different types of hot or cold items can be stored in a thermos and power cannot enter or exit the system when the thermos lid is tightly closed
Explanation:
Closed systems are those that do not interact or do not exchange energy with the environment that surrounds them, that is why internal temperatures and conditions are maintained.
The human body is an open system, that is, it would be the opposite of the thermos since we constantly exchange energy with the environment through sweating, emission of gases, urine, feces, and the ingestion of food.
Thermoses are systems specially created to maintain a medium, it will be maintained if its lid is hermetically closed to prevent heat leakage or entry in situations of cold fluids.
