Unit 4 Reactions Review

What is the reaction type?

C₅H₁₂ + O₂ -> CO₂ + H₂O + heat

• combustion

• neutralization

• single replacement

• double replacement

• endothermic

Is this reaction endothermic or exothermic?

• endothermic

• exothermic

• both

• neither

• it has a catalyst

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

What does a catalyst do to a reaction?

• speed it up

• slow it down

• raise activation energy

• lower activation energy

• cause a physical change

Tags

NGSS.HS-PS1-4

Does this reaction show an increase in entropy?

2 Fe(OH)₃+heat→Fe₂O₃+3H₂O

• yes; more products

• no; larger products

• yes; endothermic

• yes; smaller products

• no; less products

Which side of an equation are the reactants on?

• right

• left

• middle

• all the sides

Select the best choice for this reaction.

2 Fe(OH)₃+heat→Fe₂O₃+3H₂O

• endothermic; absorbing heat

• endothermic; releasing heat

• exothermic; absorbing heat

• exothermic; releasing heat

Tags

NGSS.HS-PS1-4

How can you observe that a chemical change has occured?

• new substances

• a precipitate forms

• a change in heat

• bubbling, fizzing, or the production a gas

• it is reversible

which of the following will increase a reaction rate?

• an increase in size

• an increase in heat

• an increase in agitation

• an increase in surface area

• an increase in catalysts

Tags

NGSS.HS-PS1-5

What is ENTROPY?

• MESSIER & more disorder

• Neater, cleaner, and less disorder

• spontaneous

• non spontaneous

• making a gas, making more products, making smaller products, releasing heat

When predicting products, you should think about

• First figure out who gets to be partners

• Two metals cannot be partners

• Find the charges and criss cross

• smoosh them all together

• Just write down the elements