Ch 1. Chemistry Saftey and Reactions
What is the Valve on the bottom of a Bunsen burner for?
To control the flow of gas
What is chemical change?
a - b
Is an electron positive or negative charge?
Negative
1
Define a family.
A group
How many sigfigs are in the number 12.3?
3
Is Carbon and Element, compound, or a mixture?
Element
What is the periodic symbol for Iron?
Fe
What is Frequency?
The number of waves that pass a given point in a set amount of time.
What groups on the periodic table are Transition Metals?
3-12
Why use scientific notation?
To make really big and small numbers manageable
What is Heterogeneous vs Homogeneous?
Heterogeneous = Different
Homogeneous = Same
Who discovered the Neutron?
James Chadwick
What is the Noble gas notation for Arsenic (As)?
[Ar] 4s2 3d10 4p3
What defines the "metal" group?
Less then 3 electrons
What is Density?
A measure of the amount of material (mass) in a defined volume
What is the Law of Conservation of Mass?
Matter is not created or destroyed in normal chemical reactions
How many Protons does Phosphorus (31) have?
15
What is the Aufbau Principal?
Electrons fill from the lowest energy orbitals first before moving to higher ones
The energy required to remove an electrons
What is Theory vs Law?
Theory: Wonders Why/Explains
Scientific Law: predicts what happens
What are the indications of a chemical change?
1. Change of Temperature
2. Evolution of Gas
3. Emission of Light
4. Unexpected change of color
5. Formation of Precipitate
Rubidium has two common isotopes, 85Rb and 87Rb. If the abundance of 85Rb is 72.2%and the abundance of 87Rb is 27.8%, what is the average atomic mass for Rubidium?
85.56%
What is the electron configuration for Tellurium?
[Kr] 4d10 5s2 5p4
Rank the following elements by increasing atomic radius and explain the trend: Sb, N, P
Sb<P<N
Enc