Matter, Compounds & Elements...oh my!
What is phosphorus's atomic number?
15
P
30.974
15
Identify the type of intramolecular bond:
C=C
non=polar covalent
Starting molecules of a chemical reaction are called __________
reactants
pH stands for what?
potential of hydrogen
__________ is unique because it is the only natural substance that can exist in all three states of matter
water
Identify which bonded pair would have the strongest bond (release the most energy)
1. C=N (or) 2. C-N
1. C=N
In some reactions, all reactants are converted to products, and these products cannot go back and become reactants. This makes the reaction ____________.
irresversible
Solution at pH 4 has 10 (to the power of ____) times more H+ ions compared to the solution at pH 9.
5
How many neutrons does phosphorus have?
15
P
30.974
16
Identify the type of intramolecular bond:
Mg = O
[1.2] [3.5]
ionic bond
The symbol " ⇌ " in a chemical equation notes that a chemical reaction can be what?
reversible
backwards & forwards
What formula is used to calculate the pH of a solution, given the [H+]?
pH = -log 10 [H+]
What are the four essential elements that make 96% of all living matter?
Carbon, Oxygen, Hydrogen, Nitrogen
Identify if the following would form a hydrogen bond:
With "----" equals the potential bond formation
O-H(δ-) ---- (δ+) C-N
[3.5][2.1] [3.0][2.5]
Yes
At ________ the forward & backward reactions are still happening, but the relative concentrations of products and reactants no longer changes.
equlibrium
Calculator Question!
A given solution has a [H+] of 0.000056 M. Calculate
the pH, and determine if the solution is acidic, basic or
neutral.
pH = 4.25
acidic
A compound is a substance consisting of two or more elements combined in a _______ _________. (2-words)
Fixed Ratio
Identify if the following would form a hydrogen bond:
With "----" equals the potential bond formation
O-H(δ-) ---- C-H
[3.5][2.1] [2.5][2.1]
No
A given solution has a pH of 6.5. Calculate the [H+] in M. Express your answer in scientific notation.
[H+] = 3.16 x 10 ^ -7