Chapter 1
Can you wear sandals when participating in a lab?
Absolutely not
Atomic Number Trend On Periodic Table
The atomic number increases across a period and down the group or family.
Isotopes
An isotope of a chemical element is an atom that has a different number of neutrons than the standard for that element.
Valence Electrons
A single electron or one of two or more electrons in the outer shell of an atom that is responsible for the chemical properties of the atom.
HONC 1234 Rule
Hydrogen has 1
Oxygen has 2
Nitrogen has 3
Carbon has 4
How do you properly smell something in a chemistry class?
Wafting
Law of Conservation of Matter.
A fundamental principle of classical physics that matter cannot be created or destroyed in an isolated system.
Atomic masses are measured in what?
AMU
What does the flame test prove?
Determine the identity of an unknown metal.
Octet Rule
Has to have 8 valence electrons surrounding it.
What are the properties of a solid?
Solid are characterized by structural rigidity and resistance to changes of shape or volume.
How many different elements are in this chemical formula: C2H2ClK3
4 different elements.
What element has an atomic number of 56?
barium
Why we use the Rule of zero Charge
Predicting the chemical formulas for ionic compounds
Ionic vs Covalent substances.
Ionic compounds are formed by transferring electrons that are positively and negatively charged, where covalent compounds are formed by sharing the electrons.
Chemical change VS Physical change?
Compounds are represented by a...
Chemical Formula
A neutron has the atomic mass of what?
1
What is the name of this compound?
Li2S
Lithium sulfide
Why we use the lewis dot structure
Because it is a much more simple representation of the valence shell electrons in a molecule.
How to measure the density of something
To find the density of an object, start by determining the object's mass and volume. Then, divide the mass by the volume to find the object's density.
What is the symbol for Holmium?
Ho
Atomic Mass of an Atom
The atomic mass of the atom is the mass of the protons plus the mass of the neutrons, 6 + 7, or 13.
When an atom gains or loses electrons it becomes an ion.
What do Functional groups do
Functional groups affect the smell of a compound.