Lab Safety
What's the first thing you should do if you drop a glass tube?
What is the meniscus?
The meniscus is the curved upper surface of a liquid in a tube
Prefixes come before what?
the SI unit
What is science?
Science is an ever-growing body of knowledge
Which variable can be manipulated by the experimenter?
independent variable
If a cut occurs...
Tell the professor immediately
What does qualitative mean?
Qualitative is non-numerical and uses sensory qualities to describe shape, texture, color, sound, etc.
10.0kg = how many grams?
10,000 grams.
What is scientific methodology?
A general style of investigation which is cyclical.
On which axis of a graph would the dependent variable appear?
the y-axis
Always wear these when you are doing a lab...
Safety goggles, lab coat & gloves
What does quantitative mean?
Quantitative uses numbers and units to describe results.
600 centimeters = how many hectometers?
0.06 hectometers
Define a hypothesis.
A research-based inference that can be tested. It is falsifiable, meaning it can be proven wrong.
Students determine the effect of music on plant growth by measuring the growth of one plant that is exposed to music and one plant that grows in silence. What is the control group?
the plant that doesn’t listen to music
When diluting an acid, ALWAYS pour the acid into what?
Water
What is the difference between precision and accuracy?
Precision is how close measurements are to each other, and accuracy is how close a measurement is to the accepted or actual value.
Plant growth increases as the amount of sunlight decreases. What is this an example of?
Indirect correlation
Is this an observation or Inference:
You see that a flashlight does not turn on
Observation
What variables do not change in an experiment?
controlled variables
An SDS Sheet stands for what?
Safety data sheets.
A student uses a thermometer and gets the following measurements for the temperature of boiling water at sea level: 97.0oC, 97.1oC, 96.9oC, 97.0oC, 96.9oC. (The actual temperature boiling point at sea level is 100oC.) These measurements are:
Precise
What are derived units?
Derived units are created from fundamental units by multiplying, dividing, or raising them to powers.
if your results disprove your hypothesis, should you still publish your work?
Yes! Other scientists can verify your results and can expand on your findings
How many independent variables should an experiment include? How many dependent variables?
1 independent, 1 dependent