Chemistry Midterm Flashcards
The branch of chemistry that studies the composition of matter is organic.
False
Pure chemistry is the use of data and research to attain products which improves our lives
False
Applied chemistry is concerned with the acquiring of knowledge.
False
A person who studies carbon compounds is in which field of study?
Organic
What was a major contribution to chemistry by Antoine Lavoiser?
Law of conservation of mass; he showed that oxygen is required for material to burn.
Which step in the scientific method requires you to use your senses to obtain information?
Making an observation
Studying the amount of light given off from distant stars
Pure Chem
Explaining why alcohol burns and water does not
Pure Chem
Developing a drug which does not cause nausea to be used in chemotherapy.
Applied chem
Producing a fabric which is resistant to bullet entry
Applied Chem
Designing a new method of injecting insulin to diabetics
Applied Chem
Which would chemist mostly study? A. Leaf on water B. Leaf changing color C. Leaf making music D. Leaf blown in the wind
B
Heterogeneous mixture
Not uniform in composition.
Distillation
A process in which a substance is separated by difference in boiling point
Homogenous mixture
Describes mixture with a uniform composition
Which is a physical change? A. Digestion B. Explosion C. Evaporation D. Rotting of food
C
What is a heterogeneous mixture? A air B salt water C steel D dirt
D
Which is a homogenous mixture? A. Salt water B. Beef stew C. Sand and water D. Soil
Soil
Separating a solid from a liquid by evaporating the liquid is called…
Distillation
The first figure in a properly written chemical symbol always is
Capitalized
If the equation from question #41 started with 50.0 gms on the left n there was 50.0 gms on the right, which law is this proving?
Law of conservation of mass
A solid formed from a chemical combination of two liquids is called?
Precipitate
If you are given a substance in lab and heat, then electricity and finally acid is applied with no change in composition, you could conclude that is substance is a…
Element
Precision
Repeated agreement is to accepted value
Accuracy
How close a measurement is to accepted value
Density
Amount of matter divided by amount of space
The expression of 5008 km in sci notation is…
5.008 x 10^3
Mass
Gms
Liquid volume
Milliliters
Time
Second
Distance
Meter
Temperature
Celsius
Solid volume
Cm3
What is the SI unit for mass?
Kilograms
What is the quantity 0.0075 m expressed in centimeter?
1m=100cm
.75cm
The smallest particle if an element that retains the properties of that element
Atom
A positively charged subatomic particle
Proton
A negatively charged subatomic particle
Electron
A subatomic particle with no charge
Neutron
The central part of an atom, containing protons n neutrons
Nucleus
The total number of protons and neutrons in the nucleus if an atom
Atomic mass
The average of the masses of the isotopes if an element
Period mass number
Who was the man who lived from 460 BC - 370 BC and was among to suggest the idea of atoms
Dalton
Dalton’s atomic theory included
Atoms of the same element are always identical
Who conducted experiments to determine the amount of charge carried by an electron?
Millikan
Who discovered the neutron?
Chadwick
20/10E
Mass on top
Proton on the bottom
Isotope is the proton
Tendency of electrons to enter orbitals of lowest energy first
Aufbau principle
When electrons enter orbital they tend to spread out
Hunds rule
Each orbital has at most two electrons with opposite spins
Paulis exclusion principle
Scientist who stated that electrons circle atomic nucleus like planets
Bohr
Scientist whose mathematical equation gave locations of electrons
Schrodinger
If the spin if one electron in an orbital is clockwise, what is the spin of the other electron in that orbital?
Counterclockwise
After the 4s orbital, which are the next to be filled
3d
Lithium
Red
Potassium
Violet
Sodium
Yellow
Copper
Green
Which radiation has the highest energy
Xray
Today’s modern period table is arranged in order of increasing atomic…
Number
Mendeleev
Scientist who left blanks on periodic table
Democritus
First defined the atom
