Whitch of the following are physical changes?

Rusting

Souring

Melting

Boiling

Freezing

You use an iron to press a shirt. what energy transformation is performed by the iron A heat energy to chemical energy B electrical energy to heat energy C gravitational potential energy To kinetic energy D kinetic energy to light energy

Which option distinguishes the externality in the following scenario? The Los Angeles freeway is overcrowded with cars. It often takes drivers an hour or more to travel ten miles. This free public transportation system is overloaded.

What mass of sodium chloride (NaCl) forms when 7.5 g of sodium carbonate (Na2CO3) reacts with a dilute solution of hydrochloric acid (HCl) ?

Which of the following is the Arrhenius definition of an acid? a. a substance that donates a hydrogen ion to another substance during a reaction b. a substance that increases the concentration of hydronium ions when dissolved in water c.

When 12.0 mL of a 7.13 * 10-4 M manganese (II) iodide, MnI2, solution is combined with 22.0 mL of 5.17 * 10-4 M potassium hydroxide, does a precipitate form? (Ksp for manganese (II) hydroxide is 4.

What is the function of dNA polymearse

Is it possible for a reaction to have a large equilibrium constant but small forward and reverse rate constants?

What is the name of the compound NiC03 * 8H20?

A metal ion with a net + 3 charge has five electrons in the 3d shell. Identify the metal.

How does changing the position of a light source such as a flashlight affect the size of an object's shadow