Bonding and Chemical Equations

Bonds

100

What happens to the electrons in a covalent bond?

They are shared.

200

True or False: The attraction between a positive ion and a negative ion results in a covalent bond.

False

300

What type of bond involves the transferring of electrons?

Ionic Bond

400

In an ionic bond, there is a metal and a nonmetal. Which one transfers the electron to the other?

The metal transfers to the nonmetal.

500

In an ionic bond, what charge does the metal usually have? AND WHY? (All or nothing!)

Positive charge because it gave the electron away!

Elements

100

True or False: A dot diagram represents the number of valence electrons an element has.

True

200

True or False: A compound becomes more negative when it loses electrons.

False

300

Looking at the periodic table of elements, given the following: MgO, which element will gain an electron?

Oxygen

400

An atom is chemically stable when _________.

It has 8 valence electrons.

500

What is a force that holds together atoms in a bond?

A chemical bond.

Miscellaneous

100

Is a cation positive or negative?

positive

200

How do you know how many valence electrons an element has?

The group (or family) using the Periodic Table.

300

What does the Law of Conservation of Matter mean in reference to chemical reactions?

Matter can neither be created nor destroyed and the total mass of the substances you start with (the reactants) must exactly equal the total mass of the substances you end with (the products).

400

What is a substance made from two or more combined atoms?

Compound

500

An unknown substance is a white, crystalline solid that melts at 772 degrees C.  What type of bonding is most likely present in this substance?

Ionic Bond

Chemical Equations

100

__ Al + __ HCl ----> __ H₂ + __ AlCl<sub>3

Fill in the blanks with the correct coefficients.</sub>

2, 6, 3, 2

200

In a chemical equation, which substances are listed on the right?

products

300

How many elements are in the following?                          2NH₃O₅

Three

400

What is a representation of a compound using symbols, coefficients, and subscripts?

Chemical Formula

500

__ C₃H₈ + __ O₂ ----> __ CO₂ + __ H₂O

 What are the correct coefficients to balance the chemical equation?

1, 5, 3, 4

Counting Atoms

100

How many atoms are in Al₂S₃?

5 atoms

200

How many atoms are in 3H₂SO₄?

21 atoms

300

How many atoms are in 2C₅H₄O₃?

24 atoms

400

How many atoms are in Ca₃(PO₄)₂?

13 atoms

500

How many atoms are in 5Al₂(SO₄)₃?

85 atoms