Chemical reactions

The Law of Conservation of Mass states

• that matter exists in all states and reacts the same
• that matter can only be changed into new substances by introducing a catalyst
• that matter exists in the same state throughout any chemical change
• that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants

Tags

NGSS.MS-PS1-5

What two molecules are produced in a combustion reaction?

• CO₂ + NH₄
• SiO₂ + H₂O
• H₂O + CO₂
• CO₂ + H₂O₂

Tags

NGSS.MS-PS1-5

Which of the following can be categorized as a synthesis reaction?

• Ba + NaCl →BaCl₂ + Na
• KNO₃→K⁺ + NO₃^-
• 2Li + F₂ → 2LiF
• HCl + LiNO₃ → HNO₃ + LiCl

Tags

NGSS.MS-PS1-5

What type of reaction is displayed below?
2Al + Fe₂O₃ → 2Fe + Al₂O₃

• Single Replacement
• Double Replacement
• Synthesis
• Combustion

Tags

NGSS.HS-PS1-1

What type of reaction is characterized by two compounds switching bonding partners?

• Single Replacement
• Combustion
• Synthesis
• Double Replacement

Tags

NGSS.5-PS1-4

The reaction A + B --> AB is classified as a _____ reaction.

• synthesis

• decomposition

• single replacment

• double replacement

What class of reaction best describes the equation below: Zn + H₂S --> ZnS + H₂

• synthesis

• combustion

• single replacement

• double replacement

How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl₂ + H₂

• 1
• 2
• 3
• 4

Tags

NGSS.MS-PS1-5

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

What are the correct coefficients when this equation is balanced?
KClO₃  --> KCl  +  O₂

• 2,2,2
• 2,2,3
• 1,2,3
• 3,3,3

Tags

NGSS.MS-PS1-5