What qualifies as a significant figure? (four qualifications)
All non-zeros are significant
All "sandwiched" zeros are significant
All zeros to the right are significant
All zeros to the left of the first non-zero digit are not significant
100
What are two two ways chemists classify matter.
Substances or mixtures
200
What is wrong with this definition?
Chemistry is the study of mathematics and the changes that happen because of mathematics.
Chemistry is the study of matter and the changes it undergoes.
200
Change g/ml to kg/m^3
1000 kg/m^3
200
What are the rules of significant figures for addition/ subtraction, and multiplication/ division?
Addition/ subtraction- least number of decimals in the problem
Multiplication/ division- Smallest number of significant figures.
200
Draw a picture to represent the difference in homogeneous and heterogeneous mixtures.
Open for interpretation.
300
Compare and contrast extensive and intensive properties and give one example of each.
The measured value of an extensive property depends on the amount of matter ex. mass and length.
The measured value of an intensive property does not depend on the amount of matter, ex. density and temperature.
300
What is being measured by kg/m^3?
density
300
What is 7.004+12.3476
19.352
300
What are the three states of matter and describe their properties in a container.
Solid, holds its own shape
Liquid, takes the shape of the container
Gas, fills the entire container
400
Quickly create a short skit to demonstrate precision vs. accuracy.
Open for interpretation.
400
What is wrong with this question?
5g x 1000kg/g = 5000kg
The conversion is incorrect. The correct conversion is 1kg/1000g.
400
589.006/.00354
1.66x10^5
400
What are the SI base units for length, mass, time, electric current, temperature, amount of substance, and luminous intensity?
Classify each of the following as a physical property or a chemical property, and describe the difference in a chemical and physical property.
A) Water boils at 100 degrees Celsius.
B)Oxygen supports combustion.
C) Helium is less dense than air.
D) Uranium combines with fluorine to form a gas.
A physical property is a property that can be observed or measured with out changing the identy of the origional substance. A chemical property are properties that can be observed with a chemical undergoes a chemical change.
A) physical
B) chemical
C) physical
D) chemical
500
Fred is trying to find a more simple way to construct a toy car. How could he use dimensional analysis to his favor in finding new ways to construct the car with out using all of his materials?
Use a scale model drawing.. open for other suggestions..
500
Which data set is accurate, and which is precise? explain.
6 10 true value is 10
7 20
8 15
7 11
7 44
7 2
the first set is precise because the values are all very close together, the second is accurate because it contains the true value, however the second is not precise.
500
What are the SI prefixes and the amount the correspond to?
Terra- 1x10^12
Giga-1x10^9
Mega-1x10^6
Kilo -1x10^3
Deci -1x10^-1
Centi -1x10^-2
Milli -1x10^-3
Micro-1x10^-6
Nano-1x10^-9
~Angstrom-1x10^-10 (not SI, but good to know)
Pico-1x10^-12