Lab Safety
Follow all ____ and ____ instructions carefully.
written and verball
How many steps are in the scientific method that we learned?
8
Which change can be easily reversed?
Physical Changes
Elements contain how many atoms?
1
Solids have a definite shape but NOT a definite volume
TRUE OR FALSE
FALSE
Never drink, _____, or _______ anything during a lab.
taste or smell
What is the 3rd step in the scientific method?
Hypothesis
Only chemical changes causes color change
TRUE OR FALSE??
FALSE: THEY BOTH CAN
Can be broken down into simpler substances (Elements)
Compounds
Changes in solid, liquid and gases (STATES) are the results of _____ being added or removed.
Kinetic Energy
WHAT IS WRONG??
Wrong:
Hair is not tied back, and baggy clothing is not allowed (must be secured)
What skill is a scientist using when they record the sounds of a frog?
collecting data
Results make a new substance
Chemical Change
What are the 3 types of mixtures?
Solutions, Suspensions and Colloids
A liquid has a volume of 8 mL and a mass of 56 grams. What is the density of the liquid?
7 g/mL
WHAT IS WRONG??
Cindy broke a test tube. Carefully she picked up pieces with one hand and placed them in her other hand. Then she dumped the glass pieces into the trashcan.
WRONG:
Tell the teacher IMMEDIATELY
Why is communicating the results of an experiment important?
So that other scientists can learn from the results of your experiments.
Breaking glass is a chemical or physical change?
Physical Change
What is the difference between Homogenous and Heterogenous?
Homogenous-particles dissolve and look the same throughout the solution
Heterogenous- particles are visible and look different throughout suspensions and colloids
Honey has a mass of 4.08 grams and a volume of 3 mL
What is the density?
1.36 g/mL