Scientific Method
Identifying a problem
What is the most important safety rule in the laboratory?
To always follow instructions
Which state of matter has a definite volume but no definite shape?
Liquid
Which subatomic particle has a positive charge?
Proton
True or False: A physical change results in the production of one or more new substances.
False
What is a hypothesis?
An educated guess that can be tested
True or False: Safety goggles should be worn at all times when instructed to do so during a lab experiment.
True
What is the basic unit of matter?
Atom
Where are electrons found in an atom?
In the shells
True or False: The Law of Conservation of Matter states that matter cannot be created or destroyed by a chemical change.
True
What is the dependent variable in the experiment?
The variable that is measured
What should you do if you spill a chemical in the lab?
Notify the teacher immediately and follow their instructions
What is the term for a substance made of only one type of atom?
Element
How can you determine the number of protons in an atom?
By looking at the atomic number
What is the smallest unit of an element that retains the properties of that element?
Atom
Why is it important to conduct multiple trials in an experiment?
To ensure the data and results are reliable
Why is it important to keep your workspace clean in the lab?
To prevent accidents and contamination
What is the measure of the gravitational pull on matter called?
Weight
What is the charge of the nucleus of an atom?
Positive
What type of mixture has uniform characteristics throughout?
Homogeneous
What is the purpose of a control group in an experiment?
To serve as a standard for comparison
True or False: You should always work alone in the lab to avoid distractions.
False
What is the formula to calculate density?
Density = Mass / Volume
What is the formula to calculate the atomic mass number of an atom?
Atomic Mass # = # protons + # neutrons
What is a compound?
A substance made up of two or more elements that are chemically combined