Safety
What should you always wear in a chemistry lab to protect your eyes?
Safety goggles
What is the basic unit of matter?
Atom
What is the difference between quantitative and qualitative data?
Quantitative data is numerical while qualitative data is descriptive and non-numerical
What are the three subatomic particles that make up an atom?
Protons, neutrons, and electrons
Which part of the atom determines its chemical behavior?
Electrons
This type of clothing should be avoided in the lab because it can easily catch fire.
Loose or flammable clothing
What term describes a substance made up of only one type of atom?
Element
Which type of graph is best for showing the relationship between a quantitative and qualitative variable?
Bar graph
Where in an atom are protons and neutrons found?
In the nucleus
What is the electron configuration for carbon (atomic number 6)?
1s² 2s² 2p².
In case of a chemical spill on your skin, what is the first thing you should do?
Wash the area with plenty of water
What is the difference between a physical change and a chemical change?
A physical change does not alter the substance’s chemical structure, while a chemical change results in the formation of a new substance.
What is the term for the variable that is changed or controlled in an experiment?
Independent variable
What is the charge of an electron?
Negative
Which group of elements is characterized by having a full outer electron shell and does not react with other elements?
Noble gases
What is the first thing you should do if a chemical spills in the lab?
Inform the teacher or supervisor immediately.
What do we call properties that do not depend on the amount of matter, like boiling point or density?
Intensive properties.
What does the term "accuracy" refer to in measurements?
How close a measurement is to the true or accepted value
What is the atomic number of an element, and what does it represent?
The atomic number is the number of protons in an atom and determines the element’s identity
How are elements arranged in the periodic table?
By increasing atomic number.
Why is wearing open-toed shoes in the lab dangerous?
They leave your feet unprotected from spills or dropped objects.
What do you call a mixture in which the components are evenly distributed and cannot be distinguished from one another?
Homogeneous mixture.
If an experiment produces inconsistent results, what could be a possible reason for this?
Systematic or random error.
What is the name of the theory that describes the arrangement of electrons in an atom?
The electron cloud model or quantum mechanical model
What do you call the horizontal rows in the periodic table?
Periods