Chemical Reactions REVIEW

What is a Chemical Bond? Atoms are connected by their valence electrons creating chemical bonds.

What Group doesn’t like to make chemical bonds? Group 18 the Inert Gases because they are happy with their # of valence electrons

In a chemical reaction the ______ between atoms change. BONDS Question 1

Chemical reactions are important because they make NEW SUBSTANCES Question 2

What is something you might see if new substance forming ? QUESTION 3 What is something you might see if new substance forming ? Gas Forming Color change Temperature change

Water boiling is what kind of change? PHYSICAL Question 3

Mixing oil and vinegar is a ___________ change. PHYSICAL Question 4

In a chemical reaction the same number of atoms have to be in the reactants and products. What is the name of this rule? CONSERVATION OF MATTER Question 5

2 C6H12O6 How many hydrogen atoms are there? 2x12=24 Question 6

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When you snap a glow stick it produces light and a bit of heat When you snap a glow stick it produces light and a bit of heat. What kind of reaction is this? EXOTHERMIC Question 7

Mouthwash has a pH of 8.5. Mouth wash would be classified as a__________. BASE Question 8

What is the only substance that is perfectly neutral with a pH of 7.00? WATER Question 9

Question 10 What is the only way to create new substances with different properties? Through a CHEMICAL REACTION

Last Page BONDS VALENCE ELECTRONS PHYSICAL CONSERVATION OF MASS IS ENDOTHERMIC Sugar and oxygen ACIDIC 7 NEUTRAL Last Page