Matter & Measurements
The three states of matter are _____________.
Solid, Liquid, Gas
Which state of matter do particles have the most energy?
Gas
What is an independent variable?
Independent variable is what is being changed in the experiment.
The first step in the scientific method is to ask a _________.
Question
Is a phase change a chemical or physical change?
It is a physical change.
Anything that has mass and volume is _________.
Is thermal energy added or removed during condensation? Explain answer.
Thermal energy is removed. Gas particles lose thermal/heat energy and they slow down, turning into liquid particles.
What is the constant variable in the experiment?
Constant variable is the variable that remains the same/does not change during the experiment.
An educated guess about what will happen during your experiment is a ?
Hypothesis
What is the Law of Conservation of Mass?
During a Physical change matter cannot be created or destroyed. The initial mass is equal to the final mass.
What tool is used to take find the temperature?
Thermometer
When gas particles loose thermal energy the particle movement slows down and they begin to slide past each other. Which phase change is this?
Condensation
Ashley is answering the following question
"Jasmine wants to know if plants grow better with or without soil. What is the the independent variable?'
Ashley believes the IV is plant growth. Is Ashley's answer true or False.
False.
Maegan wears red glasses, therefore he favorite colors Is probably red.
Is this an example of a qualitative observation, quantitive observation or an inference. Explain your answer.
This is an inference. Observation was used to make a guess/ assumption.
Ashley mixed two substances and noticed a gas was produced. Was this a physical or chemical change?
A chemical change.
Describe the shape and volume of liquids, gases and solids.
Liquids have an indefinite shape and definite volume.
Gases have indefinite shape and volume
solids have definite shape and definite volume
A student removes a tray of ice cubes from a freezer on a warm day. The water in the tray is solid and cold. The student forgets to put the tray back into the freezer. Describe the state of matter and temperature the substance in the tray will be the next day.
Liquid and Warm/hot
Julie wants to know if studying more each day will increase her test grades in math class. What is the dependent variable? Explain answer.
" Maegan has 10 spots on her sweater." What type of observation is this?
Quantitative
100gs of water is mixed with 30 gs of vinegar. What is the final mass?
You have a new fish tank! You need to fill you tank with a specific volume of water that is a specific temperature. Which two tools will you need to use?
Graduated Cylinder and a Thermometer
A glass of water was left out over night. The next morning there was no water left in the glass. Describe the phase change that occurred. Must include the starting state of matter and the ending state of matter.
The phase change of evaporation occurred. Liquid particles turned into gas particles.
Maddies wants to determine if the weight of the dog will determine the number of puppies in a litter. What is the independent variable?
Weight of the dog
Define qualitative and quantitative observations?
Qualitative observations use your 5 senes.
Quantitative observations use numbers.
Define chemical and physical changes.
Chemical changes occur when a new substance is created.
Physical changes occur when no new substance is created.