Random knowledge
The number 0.005436 has how many significant figures?
What is 4.
What are the three types of chemical bonding?
What are ionic, metallic, and covalent.
True or false: density is considered a period trend.
False.
What do Lewis structures show?
They show the bonding between atoms of a molecule and the lone pairs of electrons that may exist in the molecule.
What is the rate constant?
What is K.
Of the following name/symbol combinations of elements, which one is WRONG?
(a) uranium/U
(b) sulfur/S
(c) nitrogen/N
(d) potassium/K
(e) iron/I
What is Iron.
What type of bond involves the transfer of an electron?
What is an ionic bond.
In general, what is the trend in ionization energy as you go down a group?
it decreases.
What rule does Hydrogen follow when bonding?
What alters the rate of chemical reaction without being used up in the reaction?
What is a catalyst.
Identify the INCORRECT statement.
(a) Helium in a balloon: an element
(b) Paint: a mixture
(c) Tap water: a compound
(d) Mercury in a barometer; an element
What is (c), tap water: a compound.
Out of the intramolecular bonds, what is the weakest kind?
What is an ionic bond.
What is the trend in electronegativity when going across a periodic table?
it increases.
How many electrons should be shown in a lewis structure for carbon dioxide?
What is 16.
What is the integrated rate law for a zero-order reaction?
[A]t=−kt+[A]0
A reaction in which electrons are lost is an __________ reaction.
What is oxidation.
How many bonds and lone pairs does a T-shaped molecular geometry have?
3 lone pairs and 3 bonds.
Why does atomic radius decrease across a period?
It has a greater positive nuclear charge.
What is the molecular geometry for ammonia (NH3)?
What is trigonal pyramidal.
If the concentration of one of the reactants in a chemical reaction is increased, what happens to the collisions between the reactants?
There are more collisions.
What are two factors that affect polarity?
What are VSEPR molecular shapes and bond polarity.
How should one calculate formal charge?
formal charge = [# of valence electrons on neutral atom] – [(# lone electron pairs) + (½ # bonding electrons)]
According to periodic trends, which element is the most electronegative?
What is Fluorine.
How many electrons should be shown in a Lewis Structure for Nitric Acid?
What is 24.
When zinc reacts with dilute hydrochloric acid, hydrogen gas is formed. As the reaction proceeds, the rate of production of hydrogen gas decreases. Why?
The concentration of the reactants decreases.