Lab Safety
True or False: When disposing of chemicals, it is proper procedure to pour all unused chemicals down the drain.
False
A variable that is changed by you in the experiment, meaning this is what you are changing each time you do a trial, is a _____________ variable.
Independent
True or False: A Cation is an ion with a positive charge.
True
A __________ is the smallest unit of a substance that keeps all of the physical and chemical properties of that substance
Molecule
Water and sugar mixed together, dissolving and evenly distributing throughout, is an example of a ____________________ mixture.
Homogeneous
How long should you cleanse out your eyes after getting chemicals splashed up into them?
20 minutes
A variable that stay the same regardless of what else you are changing is a __________ variable.
Controlled
Which subatomic particle do we use in order to make the atomic number (The atomic number equals the number of this particle)?
Proton
Carbon (C) is an example of a ________________?
Element
When substances doesn't mix uniformly and aren't evenly distributed they form a _______________________
Heterogeneous
What angle should you keep a test tube away from you as it heats?
45 degrees
Cole is testing to see if what he drinks before running effects his finish time. He tests it with water, juice, milk and carrot juice. He wears the same clothes and shoes regardless. What variable would the different drinks be classified as?
Independent
Two atoms with different numbers of neutrons, but the same number of protons are called ___________?
Isotopes
What would be classified as pure substances?
Elements and Compound
When substances are evenly distributed and the mixture is the same throughout they form a _______________________
Homogeneous
When taking recently heated glassware, you should clean it in:
Warm Water
Cole is testing to see if what he drinks before running effects his finish time. He tests it with water, juice, milk and carrot juice. He wears the same clothes and shoes regardless. What variable would the running finish time be classified as?
Dependent
Which subatomic particle orbits the nucleus?
Electron
True or False: When elements combine to make a specific compound, they always combine in the same proportions (Example: Water can only be formed as H20, you cannot add extra elements and it still be water)
True
A ________________ is a combination of chemical symbols and numbers to represent a substance. It shows how many atoms of each element are in a unit of a substance.
Chemical Formula
What are the two protective items required each time you enter a lab area?
Eye Protection and Long Sleeves
Identify the six steps of the scientific method, in order:
1. Ask a question
2. Do research
3. Hand write all of your research
4. Test the Hypothesis (Experiment)
5. Review the date
6. Share your results
We talked about three models of the Atom. What is the current model of the Atom?
Electron Cloud Model
Look at the following: FeCl₃ . How many atoms are present for each of the elements listed?
Fe: 1, Cl: 3
Oil and water mixed together is an example of a ________________ mixture
Heterogeneous