Periodic Table
Which group of elements are the noble gases?
18
Which bond has atoms share electrons?
Covalent
What is the smallest unit of matter?
An atom
What is the formula for water?
H₂O
Balance the equation: H₂ + O₂ → H₂O.
2H₂ + O₂ → 2H₂O
What is carbon's atomic number?
6
What is an ionic bond?
Ionic bonds involve a metal and a nonmetal. These are formed when one atom transfers an electron to another.
What is density?
D = M/V. The mass of an object in relation to its volume.
What is CO₂ called?
Carbon dioxide
Balance the equation: N₂ + H₂ → NH₃.
N₂ + 3H₂ → 2NH₃
Who created the first periodic table?
Dmitri Mendeleev
Is H₂O a polar or nonpolar bond?
Polar.
What is a physical change?
A change that does not affect the chemical structure of a material, but rather a reversible change such as changes in state of matter or shape or texture.
What is NaCl called?
Sodium chloride
Balance the equation: C₃H₈ + O₂ → CO₂ + H₂O.
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
The most electronegative element. This is commonly used in toothpaste to prevent cavities. Guess the element.
Fluorine
Describe a metallic bond.
A bond that occurs between two metals. Electrons become delocalized and a sea of electrons forms.
What is the difference between a homogeneous and a heterogeneous mixture?
What is the formula for sulfuric acid?
H₂SO₄
Balance the equation: Al + O₂ → Al₂O₃.
4Al + 3O₂ → 2Al₂O₃
How does the electronegativity of atoms change across a period and why?
Electronegativity will increase across a period, except for noble gases. As you move across a period, atoms will have more protons in their nucleus, which creates a greater attraction for other electrons. Noble gases already have a full valance shell so they do not attract electrons and have no electronegativity.
Why are metallic bonds good conductors?
Metallic bonds are good conductors because of their sea of electrons. They have delocalized electrons that move around freely and act as good conductors.
This transition metal is magnetic and reacts with oxygen and moisture to form a red and brown compound. Which atom is it?
Iron (Fe)
Why are prefixes important when naming covalent compounds?
Prefixes are necessary to include when naming covalent compounds because they indicate the number of atoms within a molecule.
Balance the equation: C₈H₁₈ + O₂ → CO₂ + H₂O
2 C₈H₁₈ + 25 O₂ → 16 CO₂ + 18 H₂O