Is rust forming on metal a chemical or physical change

Jane observes that a shark detects its pray without actually touching it

How many objects in the solar system have been confirmed to currently support life? A. three B. one C. four D. two

How do the water molecules on a lake's surface behave as the water wave travels across the lake?

Which state of matter is highly compressible, is made of particles moving independently of each other, and is present in large quantities near Earth's surface? A solid B. liquid C. gas D. plasma

Describe the purpose of phosphates in fertilizer and in laundry detergent

Student follow up The ionic equation for the reaction between zinc and sulfuric acid is. Zn (s) + 2H (aq) - - Zn" (aq) + H2 (g) a State what has been oxidised in this reaction. Explain your answer in terms of electrons.

What kind of group 1 atoms are the most reactive? a. Small atoms c. Atoms with the most electrons in the valence level b. Large atoms d. Atoms at the top of the periodic table

What does it mean when there are 2.3 x 10-4 moles?

Electric force is an A. attraction and repulsion between protons and electrons . B. attraction and repulsion between protons and neutrons. C. attraction and repulsion between neutrons and electrons.

A salt crystal has a mass of 0.18 mg. how many nacl formula units does it contain?