⚗️ chemistry

1. The problem asks why there is an exceptionally large number of carbon compounds. 2. The key reason lies in the unique properties of carbon atoms, especially their ability to for

1. The problem asks about the product of hydrogenation of benzene in the presence of a nickel catalyst at 180°C. 2. Hydrogenation is a chemical reaction where hydrogen (H2) is adde

1. The problem asks: What decolourises bromine water? 2. Bromine water is an orange-brown solution of bromine (Br2) in water.

1. The problem asks: What causes the solubility of alkanols in water? 2. Alkanols (alcohols) have a general formula $C_nH_{2n+1}OH$ and contain a hydroxyl group ($-OH$).

1. The problem is to write the electron configuration for the element gold (Au). 2. Gold has an atomic number of 79, meaning it has 79 electrons.

1. The problem is to solve for the atomic number or properties related to Au, which is the chemical symbol for gold. 2. Au stands for gold in the periodic table, and its atomic num

1. The problem is to understand the electron configuration of an atom, which describes the distribution of electrons in atomic orbitals. 2. The electron configuration follows the A

1. Problem: Find the molar concentration (M) of solutions containing 10 g/L of (a) NaOH, (b) Na₂SO₄, (c) K₂Cr₂O₇, and (d) KCl. Formula: Molarity $M = \frac{\text{mass of solute (g)

1. Let's first state the problem: We want to calculate the mass of lithium using the atomic mass unit (amu) value. 2. The question is whether to use 13 amu or 15 amu for lithium's

1. Let's first state the problem: We want to find the exact thickness of lithium when it is discharged, given the thickness when fully charged and the thickness when discharged. 2.

1. **State the problem:** We need to find the concentrations of $\mathrm{Cu^{2+}}$ and $\mathrm{NO_3^-}$ ions in solution given the initial concentration of $\mathrm{Cu(NO_3)_2}$ a

1. **Problem Statement:** Convert the given units as requested in each question. 2. **Conversion formulas and rules:**

1. The problem is to understand the electrolysis of a sodium chloride (NaCl) solution. 2. Electrolysis is a process that uses electrical energy to drive a non-spontaneous chemical

1. **Problem statement:** We want to find how many kilograms of pure gold must be added to 150 kg of 800-fineness gold to obtain gold of 925 fineness. 2. **Understanding fineness:*

1. The problem is to understand the significance of the chemical equation: $\mathrm{MgCO_3 + 2HCl \rightarrow MgCl_2 + CO_2 + H_2O}$.\n\n2. This equation represents a chemical reac

1. The problem is to balance the chemical equation: \[ \text{MgCo}^{5+} + 2\text{HC1} = \text{Mg} 1^{2} + \text{CO}^{2} + \text{H}^{2}\text{O} \]. 2. First, identify the correct ch

1. The problem asks for the significance of a chemical equation. 2. A chemical equation represents a chemical reaction where reactants transform into products.

1. **Énoncé du problème :** Nous avons une expérience de décantation et une chromatographie avec trois corps A, B, et C. Il faut identifier l'appareil utilisé, dessiner son schéma

1. **Stating the problem:** We need to find the products of the reaction between calcium (Ca) and nitric acid (HNO_3). 2. **Reaction type:** This is a typical metal-acid reaction w

1. The problem is to describe the chemical reaction $\text{Ca} + 2\text{HNO}_3 \to \text{Ca(NO}_3)_2 + \text{H}_2$ in words. 2. This is a single displacement reaction where calcium

1. **Stating the problem:** We need to find the products of the reaction between calcium (Ca) and nitric acid (HNO_3). 2. **Reaction type:** This is a metal-acid reaction where cal