⚗️ chemistry

1. The problem is to determine the product of the reaction between calcium and nitric acid. 2. Calcium is a metal and nitric acid is an acid. When a metal reacts with an acid, it t

1. مسئله: آرایش الکترونی یون M1 و بررسی رسیدن به آرایش گاز نجیب و تعیین گروه، دوره و عدد اتمی عنصر M. 2. آرایش الکترونی یون داده شده: $$3d^{33}$$ و آرایش‌های دیگر ذکر شده است که با

1. مسئله: آرایش الکترونی کاتیون X+ را که در ترکیب X2O3 به صورت 3d4 است، پیدا کنیم و بررسی کنیم که آیا آرایش الکترونی تغییر می‌کند یا خیر. 2. ابتدا آرایش الکترونی اتم X را بررسی می‌

1. The problem involves determining the number of water molecules of hydration, $n$, in the compound $\text{MgSO}_4 \cdot n \text{H}_2\text{O}$. 2. Given data: 47.2% water content

1. Problem 1: Quantitative estimation of $x$ g of $(NH_4)_2SO_4$ using titration data. 2. (a)(i) The laboratory apparatus used to measure the 25.0 cm$^3$ portion of solution C is a

1. **Problem 1a(i):** Mention the laboratory apparatus used to measure the 25.0cm³ portion of solution C and state why it should be used. - The apparatus used is a **pipette**.

1. **Problem 1: Titration and concentration calculations involving (NH4)2SO4 and NaOH** (i) The laboratory apparatus used to measure the 25.0 cm3 portion of solution C is a **pipet

1. **Problem Statement:** A student used excess NaOH solution C to expel NH3 gas from (NH4)2SO4. A 25.0cm3 portion of solution C was titrated with 0.195 mol dm⁻³ H2SO4. Given titra

1. The problem asks which acid among OHNO2, CH3COOH, OHSO4, HF, and HCIO has the strongest conjugate base. 2. The strength of a conjugate base is inversely related to the strength

1. The problem asks which acid among OHNO2, CH3COOH, OHSO4, and HF has the strongest conjugate base. 2. The strength of a conjugate base is inversely related to the strength of its

1. Problem: Determine the reaction direction or equilibrium status for the reaction $$2SO_2(g) + O_2(g) \rightleftharpoons 2SO_3(g)$$ with equilibrium constant $$K=0.33$$ and initi

1. The term "Spdf" refers to the labels used to describe the different types of atomic orbitals in chemistry and quantum physics. 2. These letters stand for the shapes of the orbit

1. The problem asks for the formula of the compound formed between element Y and aluminum, given that Y forms Na2Y. 2. From Na2Y, we see that Y has a charge of -2 because sodium (N

1. The problem asks for the formula of the nitride of element X, given that X is part of the compound $X_2(SO_4)_3$. 2. From the formula $X_2(SO_4)_3$, we see that element X forms

1. The problem states that an element with atomic number 11 combines with nitrogen to form a compound. 2. Atomic number 11 corresponds to sodium (Na).

1. The problem involves naming chemical compounds based on their given formulas or names. 2. Sodium dioxonitrate corresponds to the nitrate ion, which is NO3 with a charge of -1. S

1. Chemical equilibrium is a state in a chemical reaction where the rates of the forward and reverse reactions are equal. 2. At equilibrium, the concentrations of reactants and pro

1. Calculate the number of molecules in 4.5 moles of CO2. The number of molecules in one mole of any substance is given by Avogadro's number, which is $6.022 \times 10^{23}$ molecu

1. The problem asks to identify the worst catalyst from four energy vs. reaction progress graphs. 2. Each graph shows energy changes during a reaction: an initial rise to a peak (a

1. The problem asks to identify which substance is a transition element used in high intensity lamps based on given electronic configurations and properties. 2. Recall that transit

1. The problem asks to identify the process where carbon undergoes oxidation number changes from +4 to +2 and back to +4. 2. Oxidation numbers indicate the degree of oxidation or r