Definitions
Exothermic vs. Endothermic
Criteria
Constraints
100
to take in something
Absorb
100
Endothermic or Exothermic?
Exothermic
100
What is a criteria?
the requirements a design has to meet to be successful
100
What is a constraint?
a limit or restriction on a design
200
What is an exothermic reaction?
a reaction that releases energy to it's surrounding environment (in the form of energy)
200
Endothermic or Exothermic?
Endothermic
200
A solar cooker is a device that uses the sun's energy to cook food, boil water, or pasteurize liquids. Solar cookers do not require electricity, and do not produce pollution.
Does this cooker meet the criteria?
No
solar cookers do not use electricity. This cooker has a plug, so it does require electricity.
200
Which of the following is an example of a constraint of an umbrella?
1. should be waterproof
2. should be handle
3. should weigh between 1 and 3 pounds
4. should be 4 feet wide
3. weighing between 1 and 3 pounds gives a limit on the design of the umbrella.
not less than 1 and not more than 3 pounds
300
What is an Endothermic reaction?
a reaction that absorbs energy from its surrounding (in the form of heat)
300
Exothermic or Endothermic? WHY?
Exothermic.
Flames release energy in the form of heat
300
What are 2 criteria from the Turtle SOS incubator lab?
- had to maintain the correct temperature
- must maintain the temp. for 5 minutes
- the beaker can not fall over
- must contain sand to cushion the eggs
- eggs should not be exposed to sunlight
- incubator must have space to hold the eggs
300
What was one of the constraints from the Turtle SOS incubator lab?
- you cannot use material that you were not provided
- you only get 3 tries (iterations)
400
the process of energy moving from one energy store to another
Energy Transfer
400
How many of these images represent exothermic reactions?
4
Nuclear Fission, Burning Sugar, Fireworks, Rusting Iron
400
Which of the following is not a criteria for making a bike?
1. pedals
2.protective coating
3.at least 2 wheels
4. handlebars
2
a protective coating would help the bike last longer, but it is not required for the bike to be successful
400
Why is a budget (how much someone is willing to pay) a constraint and not a criteria.
In science experiments/ projects how much something costs is a limit. If you are given $300 to build an incubator that means you have a LIMIT of $300. you can spend less but you can not spend more.
500
the act, process, or result of changing something, usually to make it work better
Modification
500
How many of these images represent endothermic reactions? Which ones?
4
Baking Bread, Cooking, Cooler than Surroundings, Melting Ice Cubes
500
What are 3 criteria for building a birdhouse?
- big enough for the bird
- sturdy
- hang in a tree
- a hole to enter through
- weather proof
- wooden
- drainage holes incase it gets wet
(these are all requirements for success)
500
What are 2 constraints for building a birdhouse?
- hole is big enough for the bird but not big enough for a predator
- light enough not to fall but heavy enough to not blow around in the wind
- hang high enough off the ground to avoid predators
- don't use nails or chemicals that could harm the birds
(these are limits on the design/needs of the birdhouse) answers could vary