Is evaporation of water a physical change or a chemical change? explain your answer?

The term gas is limited to those substances that exist in the gaseous state at

Treatment of an alpha, beta-unsaturated ketone with basic aqueous hydrogen peroxide yields an epoxy ketone. the reaction is specific to unsaturated ketones; isolated alkene double bonds do not react.

Why did Bromophenal solutions change from yellow to blue (what chemical reaction happended) ?

Sodium hydroxide, NaOH is a strong base that is used in industrial synthesis and process such as making paper. What is the mass 2.60x10^22 molecules of NaOH (molar mass=40.0g/mol) ? Express the mass in grans to three significant figures

Can sulphur pentrate glass

In Experiment 1, the density of pure ethanol was found to be:Question 1 options:less than 0.793 g/mL. 0.793 g/mL. 0.999 g/mL. greater than 0.999 g/mL.

Calculate the pH of a solution that has a hydronium ion concentration of 0.0084 M

Consider the reaction pathway graph below which indicates the energy that must be absorbed to initiate the reaction

Which statement best explains why a metal atom and a nonmetal atom are most likely to form an ionic bond? A.

What does a formation equation show