Atoms
What is the smallest unit of matter that retains the properties of an element?
What is an atom?
What is an element?
It is a substance made up of only one type of atom
What is the chemical formula for water?
H20
Is air a mixture or a compound?
Mixture
What is a chart that organizes all known elements based on their properties?
Periodic Table
What are the three main parts of an atom?
protons, neutrons, and electrons
What element is most commonly used in pencils?
Carbon (Graphite)
What do you call a compound formed by the combination of sodium and chlorine?
Sodium Chloride
What type of mixture is a salad (where you can see the different ingredients)?
heterogenous
In the periodic table, what does the atomic number represent?
Number of protons
What particle in the atom has no charge?
Neutron
Which element is the most abundant in the Earth’s atmosphere?
Nitrogen
What type of bond holds the atoms together in a compound?
Chemical Bond
What is the term for a homogeneous mixture where the solute is dissolved in the solvent?
Solution
Which element is in the same group as lithium (Li)?
Sodium
In which part of the atom are electrons located?
Shells
Which element is known for being a noble gas and is used in bright signs?
Neon
What is a compound, and how is it different from a mixture?
A compound is a substance made from two or more elements that are chemically bonded together, like water (H₂O). A mixture is when two or more substances are combined but are not chemically bonded, like a salad or sand and salt.
If you mix sand and salt, what type of mixture do you get?
Heterogenous
What is the name of the group of elements that are the least reactive and are found in Group 18 of the periodic table?
Noble gases
How many electrons can fit in the first energy level of an atom?
2
Which element has the chemical symbol “O”?
Oxygen
What is the compound made from carbon, hydrogen, and oxygen that you consume for energy?
Glucose
How can you separate a mixture of sand and salt?
Add water and Filter
What element has the symbol Ca and is often used in making toothpaste?
Calcium