Unit 1 exam Chemistry

For the following descriptions, please write “PP” for physical property, and “CP” for chemical property

flammable ​​ (a)  

​ density ​ (b)  

color ​ (c)  

burnable​ (d)  

• cp
• pp

which is an example of a chemical Property

• Density
• Color
• Shape
• Flammability

which is an example of physical change

• Melting ice
• Burning wood
• Boiling water
• Mixing salt and water

What is an example of a heterogeneous mixture

• salad
• chicken noodle soup
• fruit smoothie
• chocolate chip cookie

What is one property of a gas

• High density
• No definite shape or volume
• Low compressibility
• Fixed shape

What is an example of a compound

• Carbon dioxide (CO2)
• Nitrogen (N2)
• Oxygen (O2)
• Water (H2O)

What are Isotopes

• Atoms of the same element that have different numbers of protons.
• Atoms of the same element that have different numbers of neutrons.
• Atoms of different elements that have the same number of neutrons.
• Atoms of different elements that have the same number of protons.

How do you find Mass number

• The mass number of an atom is the total number of electrons in its nucleus.
• The mass number of an atom is the total number of protons in its nucleus.
• The mass number of an atom is the total number of protons and neutrons in its nucleus.
• The mass number of an atom is the total number of electrons and protons in its nucleus.

What is the symbol for protons

• p+
• n
• e-
• H+

What is a Cations

• Neutral ions
• Positively charged ions
• Atoms with no charge
• Negatively charged ions