Properties of Matter
What property of matter can you observe by just looking?
color (form, state of matter are acceptable)
When you mix 5 grams of salt and 15 grams of water, what is the total mass?
20 grams
What is the first step of the scientific method?
Ask a question.
A student tests which fruit decomposes fastest — the fruit type is which variable?
independent
True or false. If you cannot see matter, it does not exist.
False
If something can dissolve in water, it is said to be this.
soluble
What two words could fill in the blank? ___________ conductivity is a property of matter.
thermal and electrical
The part of an experiment that you change on purpose is called what?
Independent Variable
A student tests which fruit decomposes fastest — the speed of it rottings/decomposing is which variable?
dependent
When water evaporates from a puddle, where does the matter go?
It changes to water vapor and goes into the air.
This property describes how well a material reflects light.
Reflectivity
When an ice cube melts, the mass before and after stays the same. Why?
Because matter is conserved — it only changed state, not mass.
The part you measure or observe in an experiment is called what?
Dependent Variable
A student tests which fruit decomposes fastest — what is a control variable?
age of fruit, amount of sunlight, time tested
What happens to the total mass when an ice cube melts in a closed system?
It stays the same.
This property of matter has to do with heat
thermal conductivity
If salt dissolves in water, is it a physical or chemical change?
physical change
What are variables that you keep the same to make the test fair?
Controls (control variables)
A student tests how water temperature affects freezing time. What is the independent variable?
temperature of water
Why does a sealed bag of melting ice weigh the same before and after?
Because no matter leaves or enters the system.
What two terms classify matter as something that can vs cannot let electricity pass through it?
conductor vs. insulator
What happens to particles when water changes from a liquid to a solid?
The particles move closer together and slow down.
Mrs. Dease wants to see if playing different types of music for her plants will help them grow better. She tries out classical, rock, pop, and country. She measures the plants at the end of the week. What are the independent, dependent, and one control variable?
Independent: type of music
Dependent: plant growth
Control: type of plant, age/height of plant at beginning, amount of sunlight, amount of water, length of time with music.
A student tests how water temperature affects freezing time. What is the dependent variable?
time it takes to freeze
What do we call the idea that matter cannot be created or destroyed?
The Law of Conservation of Matter.