Lab Safety & CER
Why must you wear goggles even if you are only using food-safe materials in the lab?
What is protecting the eyes from spills/splashes that can be harmful?
On a graph, which variable goes in the x-axis?
What is the independent variable?
What is the difference between scientific law and theory?
Law = describes what happens; theory = explains why it happens
What does SI stand for?
International System of Units (Système International d'Unités)
How many sig figs are in 0.00340
What is 3 sig figs?
Give two examples of PPE required in the lab and explain why they're necessary.
Gloves (protect skin on hands)
Aprons (protect clothes)
Goggles (protect eyes)
Closed-toed shoes (protect feet from chemical spills)
Why is it important to label axes with both the name of the variable and units?
What is to make data clear and meaningful?
Name one slow, one fast, and one instant chemical reaction.
Slow = rusting of iron
Fast = burning wood
Instant = explosion/fireworks
Name 3 of the 7 SI base units?
Meter (length), Kilogram (mass), Second (time), Kelvin (temperature), Mole (amount), Ampere (current), Candela (light)
Write 54,300 in scientific notation with 3 sig figs.
What is 5.43 x 104
In CER, what is the difference between "evidence" and "reasoning"
Evidence = data/observations
Reasoning = scientific explanation that connects the data to the claim
List the steps of the scientific method in order.
What is ask a question, form a hypothesis, conduct an experiment, collect and analyze data, draw a conclusion, and share your results?
True or false: Laboratory work can be started immediately upon entering the lab, even if the teacher is not yet present.
What is false?
True or False: Celsius is the SI base unit for temperature.
False: Kelvin is the SI unit
Convert 180 seconds to minutes using dimensional analysis.
What is 3.0 minutes?
If a student spills a chemical during the lab, what is the correct safety response?
Tell the teacher, if any got on your skin, rinse with water, avoid contact with skin/eyes
Dmitri Mendeleev...?
What is created the periodic table?
What did Charles Martin do?
What is creating an inexpensive way to produce Aluminum?
Is the statement "The ice cream is soft and creamy" quantitative or quantitative?
What is qualitative?
Add: 12.3 g + 4.56 g. Answer with correct sig figs.
What is 16.9 grams?
Write a claim: "Does adding salt make ice colder?"
Yes, salt makes ice colder because it lowers the freezing point of water.
A student measures temperature every 5 minutes. What is the independent variable?
What is time?
What percentage of an atom is empty space?
What is over 99.9%?
Accuracy vs. Precision: Which means "Close to true value?"
What is accuracy?
Multiply: (3.2 x 103) x (4.5 x 102). Answer with correct sig figs.
What is 1.4 x 106