Week 1
The name of science that tries to understand matter and how it behaves by studying atoms and molecules and how they behave
What is Chemistry?
2.9 x 10^5 cm
# of sig figs
What is 2 sig figs?
Occupies space, has mass, has physical and chemical properties/
What is matter?
Defines the result of a force acting on a distance
What is Work?
Came up with the atomic Theory
Who is John Dalton?
Chemists use this as a way of learning. emphasizes observation and experimentation
What is Scientific Method?
Using the correct amount of sg figs in the answer.
1.23 + 2.4 - 1.0030 = 2.627
What is 2.6?
Where are atoms in each state of matter and how do they behave?
Solid - closely spaced, vibrate about a fixed point, do not move relative to one another
Liquid - molecules are closely spaced but ae free to move around and past each other
Gas - water molecules are separated by large distances and do not interact significantly with one another
SI unit of energy
What is Joule (J)?
True or false
Gasses are compressible
True
List all the aspects of the Scientific Method
What is Observation, Hypothesis, Experiments, Laws and Theories?
Difference between weight and mass
Weight of an object is the gravitational pull on that matter
Mass of an object is a measure of the quantity of matter within it. Doesn't depend on gravity
Atoms and molecules are arranged in geometric patterns with long-range repeating order
What is a Crystalline Solid?
Define Heat and Energy
Heat - has units of energy and can be transferred
Temperature - by contrast, is a measure of the thermal energy of matter
Define a pure substance and a mixture
Pure substance - composed of only one type of atom or molecule
Mixture - is composed o two or more different types of atoms or molecules combined in variable proportions
Law of conservation of mass states
What is " in a chemical reaction matte is neither created nor destroyed"?
Example of a derived unit
What is Density?
or
What is Volume?
Atoms or molecules do not have a long-range order
What is an amorphous solid?
Convert 50F to C
Convert 240C to K
10C
513.15K
Define Electrical Energy, Thermal Energy, Chemical Energy
Electrical energy - the energy that is associated with movement of electrical charge
Thermal Energy - the energy associated with the random motions of atoms and molecules in matter
Chemical Energy - a form of potential energy associated with chemical changes
The star closest to Earth is moving away from Earth at high velocity
What is observation?
Density of a regularly shaped sheet of metal that is 2.55mm long, 4.3mm high and 0.10mm wide and has a weight of 0.0084g
7.8 g/cm^3
Define Element, Compound
Element - a pure substance that cannot be broken down into simpler atoms
Compound - a pure substance composed of two or more elements in fixed definite proportions
Discovered a smaller and more fundamental particle called the electron
Who is J.J. Thomson
Atoms with the same number of protons but different numbers of neutrons.
What are Isotopes?