Show:
Counting Atoms
Physical Changes
Chemical Changes
Chemical Reactions
Endo/Exo
100

How many total atoms are in H2O?

3 total atoms

100
When a solid spreads and mixes evenly into a liquid.
What is dissolves?
100
The new substances produced during a chemical change.
What are products?
100
A substance that increases the rate of a reaction.
What is a catalyst?
100

Therm means...

heat

200
What elements are present in (NH4)2Fe(SO4)2?

Nitrogen, Hydrogen, Iron, Sulfur, Oxygen

200
The process that changes a gas into a liquid.
What is condensation?
200

In relation to chemical changes, the law of conservation of mass states this.

Mass can not be created or destroyed the total mass of the products will equal the total mass of the reactants.

200
The difference between an exothermic reaction and endothermic reaction.
What is that exothermic reactions release energy and endothermic reactions absorb it?
200

True or False: Water freezing is an example of exothermic. 

True. Heat is coming OUT of the water to cause it to freeze. 

300

How many Hydrogen atoms are in Na(OH2)2?

4 atoms for Hydrogen

300

The three different categories of physical changes.

Changes in shape or size, changes in mixtures, and changes in state

300
The major difference between a chemical change and a physical change.
What is that, in a chemical change, new substances form with different chemical properties from the original matter?
300
An example of an exothermic reaction and an example of an endothermic reaction.
What are anything that emits heat, light, or sound; burning; reactions between acids and bases; cellular respiration; hand warmers (exothermic); and photosynthesis; instant cold packs; and melting ice (endothermic)?
300

What forms of energy are released in an exothermic reaction?

Light, heat and sound.

400

How many total atoms are in Na(OH2)2?

7 total atoms

400
An example of sublimation and an example of deposition.
What are dry ice (sublimation) and frost (deposition)?
400
Three real-life examples of a chemical change.
What are rust, baking cookies, frying eggs, mixing substances that create a chemical reaction, wood burning, roasting a marshmallow, and many many more?
400
The five major signs of a chemical reaction.
What are changes in color, odor, energy, and the production of gases and solids?
400

Photosynthesis is an example of exothermic or endothermic?

endothermic

500

How many Hydrogen atoms are in 3Na3PO4?

24 total atoms

500

What happens to the bonds in a physical change?

Bonds are not created or destroyed. 

500

What is the scientific explanation of why the Statue of Liberty is green?

What is that copper combines with water and oxygen to form a green patina that protects the metal?

500
Four factors in controlling a chemical reaction.
What are increase in concentration of the reactant, increase in temperature, adding a catalyst, and decreasing temperature?
500
Connect kinetic energy, temperature, and energy transfer to an exothermic and endothermic reaction. 

Exothermic: Kinetic energy increases, temperature increases, and energy is released. 

Endothermic: Kinetic energy decreases, temperature decreases, and energy is absorbed.