A chemist requires 0.881 mol Na2CO3 for a reaction. How many grams does this correspond to?

List four observations that indicate that a chemical reaction may be taking place

Indicate whether the specified alkyl halides will form primarily substitution products, only elimination products, both substitution and elimination products, or no products when they react with sodium methoxide. 1-bromobutane 1-bromo-2-methylpropane 2-bromobutane 2-bromo-2-methylpropane

What are the similarities of physical and chemical change ?