What evidence indicates that a reaction has occurred? (Select all that apply.)

a. The temperature decreased.

b. A solid brown product formed.

c. The temperature increased.

d. A gas formed.

e. An explosion occurred.

Black ice is a thin layer of water on a sidewalk or road that has rozen after the temperature has dropped below freezing its called black ice because the ice-s nearly ms ble especially when driving in a car at night.

The meaning of atoms

Which of the following is not a potential sign of a chemical change? a) release of gas b) evaporation of water c) change of color d) production of gas

Which atom is likely to form a + 2 ion

What is the number of moles of solute in 250mL of a 0.4M solution?

What is the Celsius equivalent of 212°f

Identify the characteristics of tornadoes and hurricanes

When magma intrudes parallel to another rock layer, the formation is called a (n) A. sill. B. dike. C. extrusion. D. unconformity.

What is the net amount of energy released when 1 mole of H2O is produced

Why is Sn (SO4) 2 named Tin (IV) Sulfate and not Tin (II) Sulfate?