Show:
Matter
Elements
Scientific Method
Units of Measurement
Using Scientific Measurements
100
What is the difference between extensive and intensive properties? Give an example of each.
Extensive properties depend on the amount of matter that is present while intensive properties do not. extensive property --> mass, volume intensive property --> density, melting point
100
The noble gases are found in which group? What are they known for?
They are found in group 18 & are known for being very stable (non-reactive).
100
Name 3 of SI base unit measurements of quantities?
Length in meters (m) Mass in kilograms (kg) Time in seconds (s) Temperature in Kelvins (K) Amount of substance in moles (mol) Electric current in amperes (amp) Luminous intensity in candela (cd)
100
0.002115 m x 0.00000405 m express answer in scientific notation using the correct number of significant figures
8.57 x 10^-8
200
Distinguish between a chemical change & a physical change. Give an example of each.
A physical change does not change a substance's identity while a chemical change does. Physical change --> melting, cutting in half Chemical change --> burning, rusting
200
An unknown element is shiny and is found to be a good conductor of electricity. What other properties would you predict for it?
It could be malleable and ductile and a good conductor of energy as heat.
200
Express micrometers in a conversion factor with meters.
1 meter/1 000 000 micrometer or 1 000 000 micrometer/1 meter
200
What is the percentage error of a length measurement of 0.229 cm if the correct value is 0.225 cm?
2%
300
What is the difference between mass and volume?
Volume is a measure of an amount of space, while mass is a measure of an amount of matter.
300
Use the periodic table to identify the group numbers and period numbers of the following elements: carbon (C) argon (Ar) chromium (Cr) barium (Ba)
C- 14, 2 Ar- 18, 3 Cr- 6, 4 Ba- 2, 6
300
What is a hypothesis?
A testable statement that serves as a basis for making predictions and carrying out further experiments.
300
Calculate the number of milliliters in 0.603 L.
6.03 x 10^2 L
300
State the general equation for quantities, x and y, that are inversely proportional. Describe the graph.
xy = k the graph is curved
400
Explain the difference among solids, liquids, gases, and plasma by describing on a molecular level.
Solids--> molecules are in crystalline structure only vibrate (definite volume & definite shape) Liquids-->molecules are spaced out & moving (definite volume & indefinite shape) Gas--> molecules are very far apart & moving rapidly (indefinite volume & indefinite shape) Plasma--> molecules are heated so high that they lose electrons
400
What is the significance of vertical columns of the periodic table? What is the significance of the horizontal row? What are each of these called?
Vertical columns, called groups, contain elements with similar properties. Horizontal rows, called periods, contain elements with properties that vary from left to right; however, the closer they are, the less variation.
400
How does a model differ from a theory?
A model may become part of the theory. A theory is much broader than a model.
400
Find the number of centimeters in 0.09225 km
9.225 x 10^3 cm
400
Compare accuracy and precision.
Accuracy refers to the closeness of measurements to the CORRECT VALUE. Precision refers to the closeness OF A SET of measurements to ONE ANOTHER.
500
How does the composition of a pure compound differ from that of a mixture? Which is heterogeneous? Which is homogeneous?
The proportions of elements in a pure compound are fixed. Pure compounds are homogeneous. Mixtures can be either. If a mixture is uniform throughout, it is homogeneous. If not uniform, it is heterogeneous.
500
What is a model in the scientific sense?
A visual, verbal, or mathematical explanation of how phenomena occur and data are related.
500
The density of gold is 19.3 g/cm^3. What is the volume, in cubic centimeters, of a sample of gold that has a mass of 0.715 kg?
37.0 cm^3
500
divide 94.20 g by 3.167 22 mL
What is 29.74 g/mL