what are the the steps of the scientific method?
- 1.Make observations/develop a problem or purpose
- 2.Develop a hypothesis
- 3.Design an experiment
- 4.Collect data and observations
- 5.Draw conclusion
What is an Independent variable?
Variable that I change
What is an Dependent variable?
Variable that is measured
What was the IV for the plastics lab?
type of plastic/polymer
What is the DV for the plastics lab?
The distance that the plastic stretched after pulling on it
Why is a control group important in an experiment?
Important for comparison purposes. Considered the normal group -- the results that we would expect until we introduced the independent variable into the mix. Not all experiments have a control group.
What is the proper format for a testable hypothesis?
- If- sections deals with the independent variable Then- section deals with the dependent variable Because- section details research on the particular topic
What does validity mean?
Validity deals with how accurate experimental results are
What is the formula for calculating density?
Density = mass/volume
What is matter?
Anything that has mass and takes up space (volume)
What is an element?
A substance that cannot be broken down into smaller substances
Indicate which type of change (physical or chemical) is taking place?
-Baking a cake
How many atoms are in the following compounds?
In which type of bonding are the electrons completely transferred between atoms?
In which type of bonding are the electrons shared between the atoms?
Name the three general properties of an acid
1. Sour taste 2. Reacts to metal 3.Causes color to change in indicator
Name the three general properties of a base
1.Feels slippery 2.Bitter taste 3.Causes color to change in indicator
How many bonds can a carbon atom form?
With its four valence electrons, carbon can from four bonds
Why is carbon referred to as such a versatile element?
Carbon's four valence electrons allow it to form many different structures (branched chains, straight chains, and rings). It can form single, double, and triple bonds with other elements.
Define organic compound
Organic compound has carbon and hydrogen, and sometimes nitrogen and oxygen atoms COVALENTLY bonded together in a variety of compounds/structures
When many monomers are linked together they form a_____
Give an example of a synthetic polymer
Plastics, rubber, and nylon
Give an example of a natural polymer
DNA, protein, carbohydrates, and natural rubber
What are the three main types of fossil fuels?
1. Petroleum 2. Natural gas 3. Coal