Endothermic and Exothermic Reactions plus reaction rates

Endothermic & Exothermic Reactions

including reaction rates

Multiple Choice

First lets review!!

What are some signes that a chemical reaction has taken place?

• change in shape

• bubbles of gas appear

• melting

• dissolving

Multiple Choice

After you combine two substance together, a news substance forms. This is an example of :

• physical change

• chemical change

Endothermic Reaction

• energy is absorbed

• endo means absorbed or enter

• usually feel cool

Multiple Choice

In an endothermic reaction, energy is

• absorbed

• released

Multiple Choice

If a chemical reaction is ENDOTHERMIC, the temperature would...

• stay the same

• increase

• decrease

Exothermic Reaction

• energy is released

• exo means exit or released

• usually feels hot

Multiple Choice

In an exothermic reaction, energy is

• absorbed

• released

Multiple Choice

If a chemical reaction is EXOTHERMIC, the temperature would...

• stay the same

• increase

• decrease

Heat

• Exothermic reaction heat moves out of system

• Endothermic reaction heat move into a system

• 
  

Multiple Choice

What instrument would you use to detect an endothermic or exothermic reaction?

• triple beam balance

• ruler

• thermometer

• barometer

Multiple Choice

_____ reactions usually feel cool

• endothermic reaction

• exothermic reaction

Multiple Choice

Surrounding temperature gets warmer

• endothermic

• exothermic

Multiple Choice

Photosynthesis

• endothermic

• exothermic

Multiple Choice

The initial temperature was measured to be 20^oC and the final temperature was 45^oC. The reaction was

• endothermic

• exothermic

Multiple Choice

Rocket launch

• endothermic

• exothermic

Multiple Choice

The initial temperature was measured to be 20^oC and the final temperature was 10^oC. The reaction was

• endothermic

• exothermic

Multiple Select

Which of the following are examples of an Endothermic Reaction?

• Baking a cake

• Candles burning

• water evaporting

• water freezing

Multiple Select

Which of the following are examples of an Exothermic Reaction?

• Baking a cake

• Candles burning

• water evaporating

• water freezing

Take a look at this graph.

You will be asked to explain it on the next slide.

Open Ended

What type of reaction is this and how do you know?

Take a look at this graph

You will be asked to explain it on the next slide.

Open Ended

What is this graph showing? How do you know?

Reaction Rate

• the SPEED at which reactants are converted into products in a reaction

Open Ended

How would you measure the rate of a reaction?

Multiple Choice

In order to determine the rate of a reaction would you measure the reactions

• temperature

• mass of the product over time

Rates of Rection

• concentration

• pressure

• surface area

• temperature

Multiple Choice

Catalyst is the opposite of an inhibitor... a catalyst will

• speed up a reaction

• slow down a reaction

Open Ended

We want to make elephant toothpaste, which is an exothermic reaction because heat is released... How can we create the biggest reaction?

Poll

How do you feel about endothermic and exothermic reaction and the rates of reactions?

• 5

• 4

• 3

• 2

• 1