Chemical Reactions

In a chemical reaction, the substances that undergo change are called.....

• moles
• products
• reactants
• solutions

Tags

NGSS.MS-PS1-2

In the following equation, what are the reactants?
NaHCO3+HCI→NaCl+H20+CO2

• NaHCO3 and HCI
• HCI and CO2
• NaCl and H20
• H20+CO2

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is the statement of the law of conservation of mass?

• Mass can only be created. 
• Mass can only be created by chemical reactions.
• Mass cannot be created nor destroyed by chemical reactions or physical transformations.
• Mass can be created or destroyed by chemical reactions or physical transformations.

Tags

NGSS.HS-PS1-7

What are the factors the affect reaction rates?

• Catalysts, stirring, concentration, surface area, and temperature.
• There are no factors that affect reaction rates.
• Heat, volume, molar mass, and movement.

Tags

NGSS.HS-PS1-5

When a change is introduced to a system in equilibrium , what does the equilibrium do?

• The equilibrium is not impacted. 
• Absorbs the change.
• Shifts in the direction that relieves the change.

Tags

NGSS.HS-PS1-6

Balance the equation
___H2SO4 + ___Pb(OH)4→ ____Pb(SO)4 + ___H2O

• 3,5,4,6
• 3,6,3,7
• 2,1,1,4
• 4,5,1,1

Tags

NGSS.HS-PS1-7

A+BC→C+AC
Example of what type of reaction?

• Single replacement
• Double replacement
• Decomposition
• Synthesis 

What type of reaction always releases energy?

• Exothermic
• Endothermic
• Oxidation-Reduction
• Decomposition

Tags

NGSS.HS-PS1-4

What takes place at chemical equilibrium?

• Reactants form more quickly than products
  
• Products form more quickly than reactants
  
• Reactants and products stop forming
• Reactants and products form at the same rate

Tags

NGSS.HS-PS1-6

In what type of reaction does one reactant form two or more products?

• Synthesis
• Single replacement
• Decomposition
• Double replacement