Chemical Bond/Equation TEST

Why do elements bond?

• To become stable

• To increase their mass

• To decrease their energy

• To form new elements

How many valence electrons does potassium have?

• 0

• 1

• 2

• 3

Balance this equation
_Al +_HCl --> _H₂ +_AlCl₃

• 2, 4, 2, 2

• 2, 6, 3, 2

• 1, 2, 1, 1

• 3, 6, 3, 3

Is the equation balanced?: 2H₂O + O₂ --> 4MgO + 3Fe

• Yes

• No

• Partially

• Cannot be determined

How many Aluminum are in Al₂O₃?

• 1

• 2

• 3

• 4

Coefficient

• A small number to the right of a formula.

• The large number to the left of a formula.

• A variable in an equation.

• A constant term in a polynomial.

Ionic bonds are between...

• Metal and Non-metal

• Non-metal and Non-metal

• Metal and Metal

• Metal and Noble gas

Number of C's in 2Na₂CO₃

• 1

• 2

• 3

• 4

What is the little number after an element in a chemical equation called? Example: H₂

• Subscript

• Superscript

• Coefficient

• Element Number

This could be the dot diagram of Mg, Cl, C, O

• Mg

• Cl

• C

• O