Scientific Method
A variable that stay the same regardless of what else you are changing is a __________ variable.
Controlled
Oil and water mixed together is an example of a ________________ mixture
Heterogeneous
We talked about three models of the Atom. Which of the following is the current model of the Atom?
Electron Cloud Model
When is it ok to take off your protective gear and to leave the lab area (make sure your answer is the most correct, there are multiple correct answers)?
Once you have cleaned up your experiment area
Data that refers to the characteristics of what we are observing is:
Qualitative data
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: Every compound is exactly the same as each individual element it contains
False
Which subatomic particle orbits the nucleus?
Electron
What are the two protective items required each time you enter a lab area?
Eye Protection and Long Sleeves
You do an experiment that produces 150 ounces of red candy. What kind of data would the 150 ounces be classified as?
Quantitative data
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
Water and sugar mixed together, dissolving and evenly distributing throughout, is an example of a ____________________ mixture.
Homogeneous.
Which subatomic particle do we use in order to make the atomic number (The atomic number equals the number of this particle)?
Proton
What angle should you keep a test tube away from you as it heats?
45 degrees
A __________________ is different from the elements that it is composed of, but a ____________________ may have properties similar to the pure substances that form it.
Compound, Mixture
Quade enters a candy eating competition. In the competition he eats 150 ounces of candy. What kind of data would the color red be classified as?
Qualitative Data.
Look at the following: FeCl₃ . How many atoms are present for each of the elements listed?
Fe: 1, Cl: 3
The Atom on the left is gaining two electrons. What will happen to its charge? (Don't worry about how many protons it has... just focus on how the charge is changing)
Its charge will become more negative
True or False: When working with chemicals, it is the best practice to smell the chemicals directly, rather than wafting them towards you
False
Which of the following would be classified as pure substances?
Elements and Compounds
Identify the six steps of the scientific method, in order.
Ask a question, Do research, Form a hypothesis, Test the Hypothesis, Review the data, Share your result.
A pure substance is matter that has fixed composition and definite properties. Is apple juice a pure substance?
No
Two atoms with different numbers of neutrons, but the same number of protons are called ___________?
Isotope
When taking recently heated glassware, you should clean it in:
Warm water
True or False: A Cation is an ion with a positive charge.
True