⚗️ chemistry

1. **Stating the problem:** We have 8.64 g of FeC2O4 reacting with KMnO4 and Fe^{2+} solutions. We want to find the volume of Fe^{2+} solution (in cm^3) that reacts, given the conc

1. समस्या को समझें: अपचयन (decomposition) और उपचयन (displacement) अभिक्रियाएं रासायनिक अभिक्रियाओं के प्रकार हैं। 2. अपचयन अभिक्रिया में, एक यौगिक टूटकर दो या अधिक सरल पदार्थों में

1. The problem asks for the composition of the nucleus of the isotope $^{26}_{12}\text{Mg}$. 2. The atomic number (bottom number) is 12, which represents the number of protons.

1. مسئله: باید تعیین کنیم کدام گزینه عبارت «فراوان ترین عنصر در پوسته زمین است که در مدار آخر خود الکترون دارد» را به درستی تکمیل می‌کند. 2. بررسی گزینه‌ها:

1. **Stating the problem:** Identify which compound among H2, O2, NH4+, F2, and HCl contains a coordinate covalent bond. 2. **Understanding coordinate covalent bonds:** A coordinat

1. مسئله: شمار الکترون‌های لایه ظرفیت چند عنصر داده شده با شمار الکترون‌های لایه ظرفیت ۱۰ عنصر قبل از خود برابر است؟ 2. برای حل این مسئله باید بدانیم که شمار الکترون‌های لایه ظرفیت

1. مسئله: تعیین گزینه صحیح درباره اشتراک الکترون‌ها در مولکول‌ها و ترکیبات داده شده است. 2. بررسی گزینه‌ها:

1. The problem is to understand and use the formula for the rate of change of absorbance per minute, given by $$\frac{\Delta A}{\text{min}} = \frac{(\text{Abs}_{\text{sample}} - \t

1. The problem is to find the relative formula mass of water (H₂O). 2. The relative atomic masses are given: hydrogen (H) = 1, oxygen (O) = 16.

1. **Stating the problem:** We need to find the number of significant figures (s.f.) for each number in the first table.

1. **Problem:** How many atoms are present in 2.76 mol of Cassiterite SnO2? 2. **Understanding the problem:** Cassiterite has the formula SnO2, meaning each molecule contains 1 ato

1. The problem asks for the number of significant digits in the number $8.310 \times 10^3$. 2. Significant digits (or significant figures) are the digits in a number that carry mea

1. The problem is to understand the meaning and use of the unit "mM". 2. "mM" stands for millimolar, which is a unit of concentration used in chemistry and biology.

1. თქვენ მკითხეთ, შეგიძლიათ თუ არა ქიმიის შესახებ დახმარება. 2. დიახ, შემიძლია დაგეხმაროთ ქიმიაში, მათ შორის ფორმულების, რეაქციების, სტოიხიომეტრიის და სხვა თემებში.

1. **Problem Statement:** We are given atomic radii of several elements and the information that atomic radius decreases from left to right across a period in the periodic table. 2

1. The first problem asks to determine the pH of a solution with a hydrogen ion concentration of $0.000023$. 2. The formula for pH is:

1. **State the problem:** Find the mass of 3 L of hydrogen gas at 300°C and pressure $2 \times 10^{4}$ Pa, with molar mass $M=2$ g/mol and gas constant $R=8.314$ J/(mol·K). The tem

1. **State the problem:** We need to find the mass of 3 L of hydrogen gas at 300°C and pressure $2 \times 10^{4}$ Pa. Given molar mass $M = 2$ g/mol and gas constant $R = 8.314$ J/

1. The problem is to calculate the mass of a gas given certain conditions. 2. The formula to calculate the mass of a gas is derived from the ideal gas law: $$PV = nRT$$ where $P$ i

1. The problem is to understand and apply the rules of significant figures in measurements and calculations. 2. Significant figures are the digits in a number that carry meaningful

1. **State the problem:** We need to find the limiting reactant in the reaction: $$\text{CCl}_4 + 2\text{HF} \rightarrow \text{CCl}_2\text{F}_2 + 2\text{HCl}$$