Which of the following is NOT a reversible reaction?

a cutting a tree into logs

b. Dissolving sugar into water

c. Melting chocolate

d Tying your shoes

Explain using information fro the reference table why symbol (aq) is used to describe the product ZnCl2

Which type of chemical reaction occurs in Ca+CI2 CaCI2

Which statement best describes ultraviolet waves? They are higher energy than X-rays. lower energy than microwaves. higher energy than visible light. lower energy than radio waves.

If an atom of hydrogen loses its electron, what is its charge? A. - 1 B. 0 C. + 2 D. + 1 (I know it's not the first two, I'm just confused because hydrogen has one proton and one electron but has a charge of + 1)

A sample of gas has a pressure of 47.5 mm in a 125-ml flask. the sample is transferred to a new flask, where it has a pressure of 66.2 mm at the same temperature. what is the volume of the new flask

True of false an unbalanced force cannot change the direction in which an object is moving

What are the primary atoms that make up the scents that we smell?

What happens if sodium sulfide is added to iron (II) sulfide?

What is the lowest energy level that contains d orbitals? O A. 4 O B. 1 O c. 3 O D. 2

What is the nature of the Ca-Cl bond in a molecule of calcium chloride (CaCl2) if the electronegativity value of calcium is 1.0 and that of chlorine is 3.167 O A nonpolar covalent B. moderately polar covalent C.