⚗️ chemistry

1. **State the problem:** Calculate the heat of reaction $\Delta H$ for the reaction: $$2NH_3 (g) \rightarrow N_2 (g) + 3H_2 (g)$$

1. **State the problem:** Calculate the heat of reaction $\Delta H$ for the reaction: $$H_2(g) + Cl_2(g) \to 2 HCl(g)$$

1. **Problem:** Which jar contains the most atoms if each jar contains exactly one mole of carbon, sulfur, and aluminum? 2. **Problem:** Which jar contains the greatest mass if eac

1. Problem: Understand the properties of atoms related to atomic radius, ionization energy, and electron affinity. 2. Atomic Radius and Related Properties:

1. **Problem Statement:** Determine which list of elements is arranged from smallest to largest atomic radius. 2. **Concepts and Rules:** Atomic radius generally decreases across a

1. **Problem Statement:** Identify the type of intermolecular force represented by the dashed yellow line connecting a polar molecule (with $\delta^+$ and $\delta^-$ partial charge

1. **State the problem:** We need to calculate the concentration gradient $\frac{\Delta C}{\Delta x}$ for hydrogen diffusing through a palladium sheet of thickness $4.3$ mm, with g

1. **State the problem:** Calculate the molecular bond order for the $\mathrm{S}_2^{2-}$ anion. 2. **Recall the formula for bond order:**

1. **State the problem:** We want to find the yield given the theoretical amount $2000$ and the actual amount ran $1562$. 2. **Formula for yield:** Yield is calculated as $$\text{Y

1. **State the problem:** We have the reaction $$2 \text{H}_2\text{O}(g) + 2 \text{SO}_2(g) \rightleftharpoons 2 \text{H}_2\text{S}(g) + 3 \text{O}_2(g)$$ with initial concentratio

1. **State the problem:** We want to find the highest pH when comparing different acids. 2. **Recall the formula:** pH is calculated as $$\text{pH} = -\log[\text{H}^+]$$ where $[\t

1. **State the problem:** We have an initial mass of chemicals $74$ g (rounded to $2$ significant figures) and a decrease in mass of $6.3$ g (rounded to $2$ significant figures). W

1. **State the problem:** We have the equilibrium reaction $$\text{CO}(g) + \text{H}_2\text{O}(g) \rightleftharpoons \text{H}_2(g) + \text{CO}_2(g)$$ with initial equilibrium moles

1. **Stating the problem:** A student washes the inside of the conical flask containing sodium hydroxide solution with distilled water during a titration. We need to explain why th

1. **State the problem:** Calculate the volume of gas collected when $1.312$ g of $Ca(NO_3)_2$ decomposes at $25.0$ °C and $100$ kPa. 2. **Recall the balanced chemical equation:**

1. **State the problem:** We need to understand the relationship between hydrogen ion concentration $[H^+]$ and pH. 2. **Recall the formula for pH:**

1. **State the problem:** We need to identify the correct formula to express hydrogen ion concentration $[H^+]$ as the subject in terms of pH, and then use this formula to calculat

1. **Problem Statement:** We want to understand why concentration is useful to determine the number of moles in a given volume and why it is easier to use concentration than moles

1. **State the problem:** We need to identify the bonding patterns of a neutral nitrogen atom from the given descriptions. 2. **Recall nitrogen's valence electrons and bonding rule

1. **State the problem:** Determine the number of lone pairs and covalent bonds in a neutral nitrogen atom based on its Lewis dot symbol. 2. **Recall the electron configuration and

1. **State the problem:** We need to find the density of fluorine gas in g/cm^3 given the mass and volume. 2. **Formula:** Density $\rho$ is given by the formula: