Safety &
Scientific Method
Scientific Method
Why should lab aprons be worn during labs?
To protect your skin and clothes from spills
Name the four phases of matter
solid, liquid, and gas, plasma
Define a physical property and give an example.
a characteristic that can be observed without changing the substance's identity
What is the smallest unit of matter?
Atoms
What does "SI" stand for in SI units?
International System in French
What should you do if you see something on fire?
Alert the teacher
What is a pure substance?
a material that has a constant composition and properties throughout
What is an intensive property? Give an example.
a property that does not depend on the amount of substance present
Name two types of mixtures.
Heterogeneous and homogeneous
What is the SI unit for mass?
kg or g
Define independent variable.
the variable that is changed or controlled in a scientific experiment
Explain the difference between a compound and a mixture
a compound is a substance formed when two or more elements chemically bond, while a mixture contains two or more substances that are not chemically bonded
Give an example of a chemical change
burning, rusting, reaction, etc
How can you separate a mixture of sand and salt?
Mix with water and filter
Convert 0.750 grams to kilometers to centimeters.
75000cm
What is the difference between quantitative and qualitative data?
Quantitative - something you measure
Qualitative - something you observe
How are the particles arranged differently in a gas vs. a solid?
gas - particles are spread out and moving fast
solid - particles are tightly packed and only have room to vibrate
What is an extensive property? Give an example.
a property that depends on the amount of matter present
What distinguishes a homogeneous mixture from a heterogeneous mixture?
You can't see the different pieces in a homogeneous mixture
What is the SI unit for temperature?
Kelvin or K
What is the difference between a constant and a control
a constant remains the same throughout the experiment, while a control is used as a baseline for comparison
Describe a phase change and give an example
melting, boiling, etc
What is the difference between physical changes and chemical changes?
physical changes do not alter the chemical composition, while chemical changes do
Give an example of a pure substance and explain why it is classified as such.
water, etc
Explain why using SI units is important in scientific communication.
Using SI units is important because every country needs to be able to understand measurements the same way.