Chemical change. The heat from frying an egg causes the egg's protein to change permanently in texture and in appearance through a process.
I BELIEVE D IS THE CORRECT ANSWER BECAUSE IT IS INA . CLOSED SYSTEM.
Answer:
a. The formula for tritoborate ion is B₃O₈²⁻
b. The formula of the compound formed will be Fe₂(B₃O₈)₃ and the name will be Iron (iii) tritoborate
Explanation:
The formation of compounds by atoms of elements occurs in accordance with the valencies of the elements. Valency refers to the combining power of an element. For metallic elements, it is usually the number of electrons they can give up or lose while for non-metallic elements, it is the number of electrons they can accept. The valency of an atom of an element is related to its oxidation number. Metals have positive oxidation numbers while non-metals have negative oxidation numbers. Sometimes, two or more atoms combine together and react as a single unit and may carry a positive or negative charge. These are known as a radicals. For example, ammonium ion, NH₄⁺.
In the given question, calcium tritoborate, CaB₃O₈ is formed from the combination of calcium ion and tritoborate ion. Calcium ion carries the charge of +2, therefore, the tritoborate ion must have a charge of -2 in order to form a compound since the overal charge on a compound is zero.
a. let the tritoborate ion be represented by X
Ca = +2, X = ?
+2 + X = 0
X = -2
Thus, the formula for tritoborate ion is B₃O₈²⁻
b. When tritoborate ion combines with iron (iii) ion, Fe³⁺, two moles of Fe³⁺ will be required to react with three moles of B₃O₈²⁻ in order to have a neutral compound. The formula of the compound formed will be: Fe₂(B₃O₈)₃ and the name will be Iron (iii) tritoborate
Answer:
5.72 grams of O₂ are present in the sample
Explanation:
Let's calculate the moles of O₂ by the Ideal Gases Law.
P . V = n . R . T
1.66 atm . 2.50L = n . 0.082 . 283K
(1.66 atm . 2.50L) / 0.082 . 283K = n
0.179 mol = n
Molar mass O₂ = 32 g/m
Mol . molar mass = mass → 0.179 m . 32g/m = 5.72 g
