Being a Scientist
Before starting a project, what must an engineer create to decide how to run an experiment?
A plan
What is the word for a specific kind of material?
This describes the way a material looks, feels, smells, tastes, or sounds.
Properties
What happens to wood if you add enough heat to it?
It changes into ashes and is now a different substance because its properties changed
When you use your 5 senses to look at, touch, or smell a mystery substance, what are you doing?
Observing
What do you call it when you combine two or more ingredients together?
A mixture
If you are choosing a material to build a shirt, why is paper a poor choice?
It is too weak and will rip.
Can hot lava turn back into solid rock after it cools down?
Yes, rock can change into hot lava and then back into solid rock after it cools
What is it called when a scientist uses their knowledge to guess what the result of a test will be?
A prediction.
What are two ingredients that when you add heat or cold change into a different substance that cannot be changed back?
Wood, lettuce, cornstarch/water, cookie dough
If you are trying to hold two things together, what is the most important property of glue to consider?
Stickiness
Name a material that is difficult to change back to its original form after cold has been added to it
Lettuce
To prove a claim is real and true, what must you provide to back it up?
Evidence
True or False: A mixture is made of only one single ingredient
False. A mixture is made of two or more ingredients combined together
You need a material that can return to its original form once it cools. Name one example.
Ice to water, gold, wax
List three properties of clay before heat is added.
soft, squishy, wet
If an engineer is measuring how much weight an object can carry, what specific trait are they testing?
Strength (how strong it is)
If you combine materials and they become a brand new substance with new properties, can you always separate them back into the original parts?
No (not if the properties have permanently changed).
If a substance is heated and its properties remain different even after it cools down, what has it become?
A different substance
How does clay change after heat has been added?
It becomes hard, dry, and breaks easily.