Physical or Chemical?
Is the following a physical or chemical property; Ability of gunpowder to explode
What are mixtures that have all the contributing substances distributed evenly throughout the mixture
Homogenous Mixture
The variable being tested and measured in a scientific experiment. Usually in the "then" portion of the Hypothesis
Dependent variable
How many significant digits are in this number? 0.005030
4
Base SI unit for liquid volume
Liter
What is another name for a chemical change?
Chemical Reaction
What is the difference between a compound and a mixture?
Compound - chemically combined/separated
Mixture - physically combined/separated
The group of test subjects that are introduced to the test variable/procedure
Experimental Group
What is the conversion factor - meters to kilometers?
1 km / 1000 m
Name one derived unit
Solid Volume (m^3)
Density (kg/m^3)
What is the difference between the INTENSIVE and EXTENSIVE physical properties?
Intensive - independent of the amount of substance
Extensive - dependent on the amount of substance
Oil and water is an example of what kind of mixture?
Heterogenous
Name 4 of the 7 steps in the Scientific Method
1. Observe and question 2. Suggest a hypothesis 3. Generate a prediction 4. Test the prediction 5. Analyze the results 6. Accept/reject/modify hypothesis 7. Communicate the results
Multiplying with scientific notation, True or False: The coefficients must be the same
False
What is a pure substance?
form of matter having constant/uniform/unchanging chemical composition and characteristic properties
Is solubility a physical property or chemical property?
Physical
What is the difference between a suspension and a colloid?
Suspension - solid particles in liquid that drop to bottom
Colloid - particles of solute are very small
What is a hypothesis?
An educated guess that is a proposed explanation for an observation - a statement
Define the 3 components of correct scientific notation
Coefficient, base, exponent
True/False: Liquid substances be compressed
False
What are three of the signs that a chemical reaction has occurred?
New COLOR appears
BUBBLES or FIZZING
PRECIPITATE (solid material) forms
HEAT is produced
LIGHT is produced
SOUND is given off
Difficult or impossible to REVERSE
What are three different types of mixtures?
Homogeneous
Heterogeneous
Suspension
Colloid
Alloy
Solution
What are 2 of the 4 components of a good graph?
1. Descriptive caption 2. Independent variable on Y-axis, dependent on X 3. Appropriate scale 4. Include Units
Describe the difference between accuracy and precision
Accuracy refers to how close a measurement is to the true or accepted value. Precision refers to how close measurements of the same item are to each other. Precision is independent of accuracy.
What is the difference between gas and vapor?
gas-substance naturally in gaseous state at room temperature
vs
vapor-gaseous state of a substance that’s naturally a solid at room temperature