Changing States
What are the 3 states of matter?
solid, liquid, and gas
________________happens when one or more substances change into new substances.
A reaction
What are common ways to add or remove energy from a substance?
Heating or cooling
Matter is never ________ or _______________.
made or destroyed
A limit that keeps you from doing certain things:
constraint
What is it called when a substances changes from a solid to a liquid?
a state change
Each substance has different properties because the particles that make up a substance are ____________
unique
Heating cause substances to ________ and can even cause state changes.
expand
The particles that make up the matter may rearrange, join together, or break apart. But the amount of matter ____________________.
stays the same
The properties that you want for a material or a solution are called
Criteria
evaporation
4 signs of a reaction are:
1. Gas Formation
2. Color change
3. Solid Formation
4. Energy change
Reactions form new substances that have different ______________.
properties
Heating and cooling matter can cause changes of ______, can cause substances to ______or _____, and can cause ________ but matter is always __________.
1. State
2.expand or contract
3. reactions
4. conserved
Engineers have to pick materials to use in their solutions that meet their _______and work within the _________.
criteria
constraints
What is condensation?
When a gas changes to a liquid
What happens to the substances when a reaction occurs?
A new substance is formed
Breaking a glow stick and causing it to light up is an example of what kind of reaction? Is a new substance formed?
Energy change (it produces light). Yes, this was a chemical reaction and a new substance is formed
When you mix substances, it can cause one substance to ______or it can cause a _______
dissolve
reaction
The steps that engineers follow when choosing a material to use in a design is called.
Engineering Design Process
How do the particles in a substance changes during state changes? Is a new substance formed?
The particles are arranged and move differently. No new substance is formed.
True or False: If the properties of a substance change it means a new substance has definitely formed.
False... for example, breaking glass creates new properties, but the substance is still glass
Keeping food in a freezer or refrigerator makes the food spoil less quickly because:
Food can go bad partly because of reactions that happen in the food. Cooling matter down slows down its particles. Reactions still happen, they just happen more slowly.
When a pattern like this is observed again and again, scientists assume that the pattern is true and a_____of science.
law
The steps of the Engineering Design Process include: defining the problem, identifying constraints, identifying criteria, and then selecting the best material.
Defining the Problem (Ask)
Identifying constraints, identifying criteria (Imagine)
Plan
Create
Improve