Measurement
10 millimeters is equal to______centimeter(s).
ONE centimeter
If an accident occurs in the lab, this is the first thing a student should do
Tell the teacher
The first step in the Scientific Method
Identifying a question or problem
Which tool is more accurate for measuring a liquid: a beaker or a graduated cylinder?
A graduated cylinder
This is the name given to your explanation of something you have observed. For example, you see and hear a dog barking at the entrance to a cave and conclude that there is something inside the cave
Inference
Which type of variable is this:
The quantity that an experiment measures or observes
Dependent variable
A measure of how much 3D space an object takes up. (hint - liquid measurement)
Volume
True or False: ALL girls must always tie their hair back before a lab?
False - anyone with long hair should tie hair back. People with short hair are fine!
This is the last step of the scientific method during which one decides if their hypothesis is supported or refuted.
The conclusion
What tool is used to measure the mass of small (eg. less than 200g) objects?
Electronic balance, or triple beam balance
Is the following an observation or inference? You notice that there is a broken window in the science lab.
Observation?
Define the independent variable
The variable that you change intentionally in order to test its effect on the dependent variable
20 centimeters, 30 kilograms, 40 minutes, 2 hours are all examples of ______ data. (qualitative or quantitative)
Quantitative
TRUE or FALSE: Upon entering the science lab, it's fine to pick up the materials and equipment as long as you put them back before the beginning of the lesson.
False. (Please do not touch until you know how to properly handle everything.)
After creating a hypothesis a scientist will often design an ____________to test it.
Experiment
A scientific tool that makes small things appear larger.
A microscope (or hand lens or magnifying glass)
Is the following a quantitative or qualitative observation?
"The temperature of the water in the kettle was 42 degrees Celsius when measured by the student."
Quantitative
Students are investigating how changing the mass of a paper aeroplane affects its flight distance. Identify the dependent and independent variables.
Dependent: distance
Independent: mass
The curve at the top of surface water and most liquids is...
The meniscus
If you touch any chemical in the lab, even one that is said to be safe, what should you do afterward?
Wash your hands
The part of a scientific report where observations and measurements are recorded
Results
True or false: Wearing gloves and goggles is a requirement of every lab or experiment
FALSE (Many times the teachers will ask students to experiment or conduct an activity that does not require gloves or goggles, but as students get older this often becomes more necessary.)
What are quantitative observations?
Those that involve measured numerical values.
On a graph, which variable goes on the y-axis (vertical axis)?
The dependent variable
The unit of measurement for temperature?
Degrees Celsius
or
Kelvin
Proper behavior or improper behavior: Student Bob is wearing goggles and gloves while reaching across a hot plate to get the lab instructions from his partner.
Improper behavior (While wearing goggles and gloves are often required during a lab - reaching ACROSS a hot plate for a PAPER is not wise!)
A testable statement that attempts to predict the outcome of the question/problem.
The hypothesis
During the experimental phase of the scientific method, it is important for the designer to list the__________ needed and describe the PROCEDURES so that others can follow.
Materials / equipment
Observation or inference:
Explaining or predicting things or events based on prior knowledge, observations, and/or logic
Inference
Students are investigating how the concentration of reactants affects the rate of a chemical reaction. List three controlled variables to ensure a valid experiment.
Many answers. Examples:
Volume of solutions
Temperature of solutions
Amount of stirring
Room temperature