Question 1: To determine which process describes only a physical change, it is essential to recall that a physical change involves a change in physical properties without altering the chemical composition of a substance. Common examples of physical changes include melting, freezing, dissolving, or breaking.
Since the specific processes (Process 1, 2, 3, and 4) are not detailed here, I am unable to identify which one is a physical change. However, if you provide the descriptions of each process, I can help you determine which one describes only a physical change.
Question 2: For the reaction between calcium hydroxide (Ca(OH)2) and sulfuric acid (H2SO4), you need to refer to the balanced chemical equation and the stoichiometry of the reaction to find out the amount of sulfuric acid used. Assuming a common reaction:
\[ \text{Ca(OH)}_2 + \text{H}_2\text{SO}_4 \rightarrow \text{CaSO}_4 + 2\text{H}_2\text{O} \]
To answer how many grams of sulfuric acid were used, we would typically need the balanced equation with molar masses of the reactants and products to do the calculations properly.
Without additional context on the specific quantities of reactants/products or a balanced equation, I cannot provide the exact grams of sulfuric acid utilized. If you have any additional information like the complete balanced equation or other context, feel free to share it, and I can help determine the correct answer!
If you only need to choose from the responses given (100 g, 62 g, 98 g, and 36 g) without any calculations, you'll need to refer to any provided data or context to make an educated choice.