Ans: 4) PbSO4
Different compounds are soluble in water to a different extent, some of them are completely insoluble in water. Solubility rules help in identifying the water soluble and insoluble compounds.
Based on the rules:
1) Salts of group IA (Li, Na, K, Rb and Cs) are soluble in water
2) Salts containing NH4+ ions are water soluble
3) All phosphates (PO4³⁻) are insoluble except those containing group IA elements and (NH4)₃PO4
4) All sulfates, SO4²⁻ salts are generally soluble with the exception of Ca2+, Sr2+, Ba2+, Hg₂²⁺, Hg2+, Pb2+ and Ag+
Therefore, among the given examples:
1) KOH contains group 1A (K) therefore soluble
2) Na3PO4 contains group IA element (Na), therefore soluble
3) NH4Cl contains NH4+ ion, therefore soluble
4) Sulfate of lead (Pb) is insoluble
The compound that is insoluble in water is:
Lead(II) sulfate (PbSO4) is generally considered insoluble in water. It forms a precipitate when mixed with water, indicating low solubility. In contrast, the other compounds listed are soluble in water:
(1) KOH (Potassium hydroxide) is soluble in water and dissociates into potassium ions (K+) and hydroxide ions (OH-).
(2) NH4Cl (Ammonium chloride) is soluble in water and dissociates into ammonium ions (NH4+) and chloride ions (Cl-).
(3) Na3PO4 (Sodium phosphate) is soluble in water and dissociates into sodium ions (Na+) and phosphate ions (PO43-).
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Answer:
CO₂
Explanation:
The product of the reaction is CO₂.
In a chemical reaction, the product is the substance usually found on the right hand side of the expression.
Reaction equation is given as;
C + O₂ → CO₂
In this reaction, C and O₂ are the reactants
CO₂ is the product of the reaction.
Answer:
A
Explanation:
2) 0.000023
3) 101,000
4) 0.010
5) 45.01
6) 1,000,000
7) 0.00671
8) 4.50
The question asked about converting normal numbers into scientific notation. The answer provided the eight scientific notation equivalents for each of the numbers provided in the question, explaining the process of calculating them.
To write numbers in scientific notation, we have to express them in the form of a x 10^n, where 1 <= a < 10 and n represents the number of places the decimal place has been moved. Let's proceed with each given number:
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Answer:
The mass number of an isotope is the sum of neutrons and protons.
Explanation:
In any elemental isotope, the only things that will affect molar mass and mass number is the number of protons and neutrons. Electrons are not counted because we usually assume they are equal to the amount of protons and have no weight.
Protons are what gives the element its atomic number and the neutrons determine the type of isotope it is within the element.
For instance:
There can be a regular Carbon - 12
But there are isotopes like Carbon - 13 and Carbon - 14.
*The number of protons stays the same but the number of neutrons are different
b. move from their ground states up to excited states.
c. attach to the nucleus.
d. form a bond with the nearest proton.
When electrons absorb energy they are able to move from their ground states up to excited states. The answer is letter B. an example of this is when you light a match. The molecules of the matchstick are in its ground state. When you flick it on the ground or anything hard, it causes its molecules to move into the excited state and thus causing fire.
When lithium hydroxide pellets are added to a solution ofsulfuric acid, lithium sulfate and water are formed. The balanced chemical reaction is 2LiOH + H₂SO₄ → Li₂SO₄ + 2H₂O.
A chemical equation is said to be balanced if the quantity of each kind of atom in the reaction is the same on both the reactant and product sides. In a balanced chemical equation, the mass and the change are both equal.
Following the rule of conservation of mass requires that a chemical equation be balanced. The balance of a chemical equation is disregarded by the rule of conservation of mass. The law states that a chemical process cannot produce or destroy matter.
When lithium hydroxide pellets are added to a solution of sulfuric acid, lithium sulfate and water are produced.
Thus, The balanced chemical reaction is 2LiOH + H₂SO₄ → Li₂SO₄ + 2H₂O.
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