Lab Safety
What should you always wear to protect your eyes during lab experiments?
Safety goggles or Safety glasses
What is the simplest form of matter that cannot be broken down by chemical means?
element
What is the term for water molecules sticking to other water molecules?
Cohesion
If a chemical accidentally splashes into your eye during an experiment, what is the correct immediate action you should take? (what safety equipment do you use)
Eyewash Station
Why is it important to NEVER eat or drink in the lab?
To avoid ingesting harmful chemicals or contaminants.
Water (H₂O) is made of hydrogen and oxygen bonded together. Is it an element, compound, or mixture?
A compound
What property of water causes it to stick to other substances, like the sides of a glass?
Adhesion
Is this an element or a compound? Why?
Water (H₂O)
Compound, because they cannot be separated by physical means
Why should you always read instructions before starting an experiment?
To understand the procedure, prevent mistakes, and ensure safety.
Salt water looks uniform throughout and cannot be easily separated by sight. What type of mixture is it?
Homogeneous mixture
Why can some insects walk on water without sinking?
surface tension
A water droplet forming is an example of cohesion or adhesion?
COHESION!!
If glassware breaks during an experiment, what should you do?
Tell the teacher immediately and do not touch the broken glass with bare hands.
A salad with lettuce, tomatoes, and cucumbers is an example of what type of mixture?
Heterogeneous Mixture
When you place a celery stalk in colored water, the color slowly moves up into the leaves. What is this process called?
Capillary Action
Identify each as an element, compound, homogeneous mixture, or heterogeneous mixture:
Iron (Fe)
Carbon dioxide (CO₂)
Air
Sand and water
Element
Compound
Homogeneous mixture
Heterogeneous mixture
If a fire breaks out in the lab what is the first thing that you should do?
A. go and get the fire extinguisher
B. tell the teacher immediately
C. throw water on the fire
B. Tell the teacher immediately
You are given four samples: oxygen gas (O₂), table salt (NaCl), sweet tea, and trail mix. Classify each as an element, compound, homogeneous mixture, or heterogeneous mixture.
Oxygen gas = element; Table salt = compound; Sweet tea = homogeneous mixture; Trail mix = heterogeneous mixture.
What are five examples of cohesion?
Up to Ms. Esquibel
What are three testing strategies that we need to use for our test!
Ms. Esquibel will decide which answers are acceptable.