Chemical Reactions Review

During a chemical reaction, what happens to the ATOMS of each element or compound?

• they appear

• get rearranged

• disappear

• stop moving/vibrating

Tags

NGSS.MS-PS1-5

Identify the PRODUCTS in the following chemical reaction:

Chromium Oxide + Carbon --> Chromium + Carbon Monoxide

• chromium and carbon

• chromium and carbon dioxide

• chromium and carbon monoxide

• chromium oxide and carbon

Tags

NGSS.MS-PS1-2

 $4Ag\ +\ 3O_2\ ->\ 2Ag_2O$  How many Silver (Ag) atoms are REACTANTS in this equation?

• 4

• 3

• 2

• 1

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-1

In chemical reactions, a product is______

• any substance that is made of the greatest number of atoms

• any substance that is to the left of the arrow

• any substance that is made from the least number of atoms

• any substance to the right of the arrow

Tags

NGSS.MS-PS1-5

What does the Law of Conservation of Mass state in regards to Chemical Reactions (hint: it's a vocabulary word!)

• Atoms cannot be gained or lost in a chemical reaction

• Atoms can only be gained in a chemical reaction

• Atoms can only be lost in a chemical reaction

• Atoms can be gained and lost in a chemical reaction

Tags

NGSS.MS-PS1-5

What is the little number after an element in a chemical equation called? Example: H₂

• coefficient

• atom

• subscript

• equation

Is the following equation balanced?

Al + O₂ --> 2Al₂O₃

• yes

• no

Tags

NGSS.MS-PS1-5

Is the following equation balanced?

4Fe + 3O₂ --> 2Fe₂O₃

• yes

• no

Tags

NGSS.MS-PS1-5

Which of the following equations are correctly balanced?

• 12CO₂ + H₂O --> C₆H₁₂O₆ + O₂

• CO₂ + H₂O --> 3C₆H₁₂O₆ + O₂

• CO₂ + 9H₂O --> C₆H₁₂O₆ + O₂

• 6CO₂ + 6H₂O --> C₆H₁₂O₆ + 6O₂

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

What type of reaction involves breaking down 1 substance into 2 or more substances?

• single replacement

• double replacement

• synthesis

• decomposition