Chemistry Review

Which best describes water?

• a compound
• an element
• a heterogeneous mixture
• a homogeneous mixture 

How are atoms combined in a mixture?

• chemically combined and cannot be separated
• physically combined and can be separated
• chemically combined and can be separated

When potassium and bromine atoms form chemical bonds, which of these is produced?

• an element
• a mixture
• a compound
• a new form of matter

Sodium (Na), lithium (Li), and potassium (K) are grouped together in one column on the periodic table. Which property do they share?

• soft texture
• high reactivity
• semiconductivity
• gas at room temperature

Which element is in the same family as chlorine (Cl) and fluorine (F)?

• hydrogen (H)
• lithium (Li)
• oxygen (O)
• bromine (Br)

Which elements would have similar properties to those of potassium?

• lithium and sodium
• bromine and krypton
• calcium and scandium