Phys Flashcards
What holds a compound together?
Chemical bonds
Each molecule of table sugar, C12H221, Contains how many atoms of each element?
12 atoms of carbon, 22 atoms of hydrogen, and 11 atoms of oxygen
Formaldehyde, CHO and acetic acid, C2H402 have the same empirical formula but different what?
Molecular formulas
How would the name for the compound with the formula CuBr would be written?
Copper (II) bromide
In which substance (state of matter) do the molecules have the strongest attractions to one another?
A solid
Why do atoms often join together?
So that the outermost energy level is full of electrons
Why do solid ionic compounds have very high melting points?
They contain charged ions that are locked tightly together
In a metallic bond, what attracts the nucleus of one atom?
A nearby atom’s electrons
What is the simplest organic compound?
Methane
Example sentence: Methane is a simple organic compound composed of one carbon atom and four hydrogen atoms.
What are polymers?
Large organic molecules that are made of repeating units
Example sentence: Polymers such as plastics are composed of long chains of repeating units.
What is a protein?
A polymer that is made of amino acids
Example sentence: Proteins are essential molecules for various biological functions.
What is the purpose of a ball and stick model?
To help you understand a compound’s structure
What are covalent bonds formed between?
Nonmetals
What can you say about the ions in NaCl?
There are an equal number of sodium and calcium ions
What does the name dinitrogen tetroxide tell you about the compound?
2 nitrogen atoms and 4 oxygen atoms
What is the distance between the nuclei of two bonded atoms called?
Bond length
In ionic compounds, the positively charged ions are formed from what?
Metal elements
Why do gas molecules take up a lot of space?
The attraction between gas molecules is low.
What kind of bond is formed by the attraction between positively charged metal ions and the electrons around them?
A metallic bond
What is the name for the compound consisting of Br and Cd 2+?
Cadmium (II) bromide
What is the simplest formula for a covalent compound?
Its empirical formula
What kind of bond is formed by the attraction between positively charged metal ions and the electrons around them?
A metallic bond
Example: The metallic bond in copper gives it its characteristic properties.
What is the name for the compound consisting of Br - and Cd 2+?
Cadmium (II) bromide
What is the simplest formula for a covalent compound?
Its empirical formula
What are compounds that have repeating subunits?
Polymers
