Chemical Equations Review

How many oxygen atoms are present in the following? 
4Ca(OH)₂

• 4
• 6
• 8
• 1

Tags

NGSS.MS-PS1-1

Identify the Reactants in this equation.

• A

• B

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

What are the blue numbers called?

• oxidation numbers

• subscripts

• group numbers

• product numbers

Tags

NGSS.MS-PS1-1

 $C_2H_6\ +\ 5O_2\ \rightarrow\ 2CO_2\ +\ 3H_2O_2$  
Given this chemical equation, what are the PRODUCTS?

•  $C_2H_{6\ }and\ 5O_2$  

•  $2CO_2\ and\ 3H_2O_2$  

Tags

NGSS.MS-PS1-2

In chemical reactions, what does the principle of conservation of mass mean?

• Matter is not created or destroyed.
• The total mass of the reactants is greater than the total mass of the products.
• The total mass of the reactants is less than the total mass of the products.
• Matter is not changed.
  

Tags

NGSS.MS-PS1-5

How many Oxygen (O) atoms are in 2C₂HO₈C_l2

• 2
• 16
• 8
• 5

Tags

NGSS.MS-PS1-1

How many Hydrogen (H) atoms are in NH₃O5

• 3
• 4
• 5
• 1

Tags

NGSS.MS-PS1-1

Which of the following reactions is balanced?

• 2CH₄ + O₂ -> CO₂ + H₂O
• CH₄ + 2O₂ -> CO₂ + H₂O
• CH₄ + 2O₂ -> CO₂ + 2H₂O
• None of the chemical equations are balanced.

Tags

NGSS.MS-PS1-5

Is the equation balanced or unbalanced?

2 Na+ Cl₂ -> 2 NaCl

• Balanced

• Unbalanced

Is the equation balanced or unbalanced?

H₂ + O₂ -> 2 H₂O

• Balanced

• Unbalanced