Atomic structure & Periodic Table
Scientific Method
Significant Figures
Dimensional Analysis
Matter & Energy
100
Which subatomic particle makes it so that isotopes have differing masses?
Neutrons
100
What are the steps of the scientific method?
1) Observation
2) Hypothesis
3) Experiment
4) Results
5) Reject/confirm hypothesis
100
How many sig figs in the following number: 0.002590
4 sig figs
100
Convert 3.12 lbs to kg.
1.41kg
100
True or false: Heat energy flows from an object with lower temperature to one with a higher temperature.
False. Energy flows from high temp to low temp.
200
What are the seven diatomic molecules
H2, N2, O2, F2, Cl2, Br2, I2
200
True or False: A Scientific law explains why something is occurring in nature.
False. Laws do not explain why, theories do.
200
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Determine the volume in the image above.
6.59 or 6.60
200
Convert 156cm to dm.
15.6dm
200
How does temperature effect the molecules of of a substance?
Higher temps, the more energy, and faster moving particles.
300
How many neutrons does Gold-197 have?
118
300
Observation, theory, or law: A candle burns more brightly in pure oxygen than in air.
Observation
300
What is the difference between accuracy and precision?
accuracy: how close a measured value is to a true or accepted value
precision: repeatability or number of sig figs
300
Convert 15.8 g/mL to oz/gal.
2.11x103 oz/gal
300
Describe the shape and volume of a solid, liquid, and gas.
solid: definite shape & definite volume
liquid: indefinite shape & definite volume
gas: indefinite shape & indefinite volume
400
What is the difference between cations and anions?
cations: + ions, #e<#p, loss of electrons, metals tend to do this.
anions: - ions, #e>#p, gain of electrons, nonmetals tend to do this.
400
Observation, theory, or law: In most coastal areas, high tides occur one to two times each day.
Law
400
Solve the following with correct sig figs: 2.76+0.234+305.8
308.8
400
A European-made dishwasher is installed in a home in Ohio. The manual states that the temperature of the water should be greater than 90.0 ∘C. What should the minimum water temperature be in degrees Fahrenheit?
194.0
400
Define each of the following as chemical or physical changes/property.
1)Flammability
2)Melting point
3)Salt dissolving in water
4)Sugar burning on a stove
1)chemical
2)physical
3)physical
4)chemical
500
Which model of atomic structure proposes that atoms are solid, with negative electrons spread throughout a positively charged matrix?
Thomson's Plum Pudding Model
500
Observation, theory, or law: After repeated experiments, scientists believe that a class of antibiotics functions by weakening the cell walls of certain bacteria.
Theory
500
Solve the following with the correct sig figs: 25.4/(1.61-0.876)
35
500
If you have 15 g samples of table salt (d=2.16 g/mL), cork (d=0.24 g/mL), sodium metal (d=0.97 g/mL), and aluminum metal (d=2.70 g/mL), which sample has the GREATEST volume?
The cork.
500
Table salt is a substance made up of sodium atoms and chlorine atoms bound in a 1:1 ration. (element, compound, homogenous mixture, or heterogeneous mixture?)
Compound