Midterm Study Guide Flashcards
What is a model?
A model is a representation of an object or system.
Name the three types of models and give examples of each.
Physical-model of car, flower, a model of a cell
Mathematical-weather map
Conceptual-big bang theory
Explain why a weather map of the current weather is a mathematical model.
It uses data to make predictions.
What are some limitations of models?
may not behave or move the same as the real thing;
may not be the same size or scale;
may not made of the same material,
What two things make a hypothesis valid?
Testable and supported by evidence
How many millimeters are in 5 meters?
5m = 5,000 millimeters
What is the SI unit for length, volume, mass and temperature?
Length- m
Volume- cm3 or L
Mass- g
Temperature- K c
Explain how the volume of an irregularly shaped solid can be determined using a graduated cylinder.
Fill the cylinder a given mark, note the level of the water. Add the object and see how much the water rises. The difference between the two marks is the volume of the object.
Define density? What is the equation used for calculating density?
Density is the amount of matter in a given volume. D=m/v
Calculate the density of a piece of rock that has a mass of 42 grams and a volume of 8 cm3.
5.25g/cm3
True or False: 1 ml = 1 cm3
True
Name three types of safety equipment used when dealing with hazardous chemicals.
Goggles, Aprons, Gloves
Name the steps of the scientific method in order.
Observation
Problem/Question
Research
Hypothesis
Experiment
Analyze
Conclusion
Share results
What is a scientific observation?
Any use of the senses to gather information.
The independent variable is graphed on what axis?
X-Axis
The dependant variable is graphed on what axis?
Y-Axis
Name the independent and dependent variable in the following statement, “ If the amount of sunlight a sunflower receives increases, then the plant will live longer.”
Amount of sunlight (IF) is the independent variable. How long the plant lives (THEN) is the dependent variable.
Give an example of a descriptive, comparative, and experimental investigation.
Comparative – comparisons made between two or more items without manipulating variables (Ex. Watching and recording a month of moon phases)
Experimental – controlled set of conditions used to test a HYPOTHESIS. A VARIABLE is manipulated (Ex. Giving more light to a plant than another of the same plant to see which grows better)
Descriptive – observations recorded but NO comparisons are made and NO variables have been manipulated (Ex. Watching and recording the activity of an animal in its environment)
What are each of the following tools used for? psychrometer, barometer, anemometer, spring scale, beaker, triple beam balance, graduated cylinder, thermometer.
Psychrometer = humidity
Barometer = air pressure
Anemometer = wind speed
Spring scale = force
Beakers = hold liquids
Triple beam balances = mass
Graduated cylinders = volume
Thermometers = temperature
A neap tide has the angle of the moon, sun, and earth at what angle?
90 degrees
A spring tide has the angle of the moon, sun, and earth at what angle?
180 degrees
How do high tidal ranges and low tidal ranges relate to spring and neap tides?
Highest tidal range during spring tides and lowest tidal range during neap tides
Which moon phases are associated with neap tides?
1st and 3rd quarter moon phases
Which moon phases are associated with spring tides?
New and Full moon phases
What is the difference between a waxing moon and a waning moon in terms of how the amount of light seen is changing? On which side is the light?
Waxing: Sunlit part of the moon grows larger , light on the right
Waning: Sunlit part of the moon gets smaller, light on the left
What moon phase is always between the Earth and sun?
New moon
What causes the seasons on Earth?
Axis Tilt and its revolution around the sun.
What would be different about Earth if there were not different seasons?
If there were no seasons it would be due to not having a tilted axis or no revolution.
During ____(season) the north pole receives 24 hours of sunlight, while at the same time, the south pole is experiencing ___(season) and receives 0 hours of sunlight.
summer, winter
Why doesn’t the equator experience seasonal temperature changes?
the sun continually strikes the earth at the same angle giving the equator an even amount of sunlight all year long