Which of these is common to all chemical changes?

A)

A change of state occurs.

B)

A change of color occurs.

C)

A new substance is produced.

D)

Heat is released into the air.

Which of the following statements is false? Vapor refers to a gas formed by evaporation of a liquid or sublimation of a solid. Solid water (ice), unlike most substances, is denser than its liquid form (water).

The flashing of fireflies is the result of a chemical reaction, and the rate of flashing can be described by the Arrhenius equation. A certain batch of fireflies were observed to flash at a rate of 17.0 times per minute at 25°C and at a rate of 5.

How many milliliters of a 2.5 M LiOH solution are needed to completely neutralize 25 mL of a 1.0 M H2SO4 solution?

Why is 1g of cobalt oxide nanoparticles a better catalyst than 1g of cobalt oxide powder?

Is this statement true or false? Atoms in liquids vibrate too much to stay in a fixed position.

How many moles are in. 12 grams of gold.

When lithium reacts with bromine to form the compound LiBr, each lithium atom: (1) gains one electron and becomes a negativelycharged ion (2) gains three electrons and becomes a negativelycharged ion (3) loses one electron and becomes a

Based on what you know about matter, explain why the food coloring mixes at different rates

What does the variable A stand for in the Arrhenius equation? A. activation energy B. frequency factor C. rate constant D. reactant concentration

Name 3 sets of elements that have been added to the periodic table since mendeleev's time