Science test
Define qualitative and quantitative variables and give an example of each.
Quantitative – deals with numbers, can be measured. Examples: height of a person, temp. of a room.
Qualitative – Deals with descriptions, cannot be measured. Examples: mood of a class, texture of something
Describe how to find the volume of an irregular solid such as a rock.
Water displacement – Fill a graduated cylinder to a certain volume, place rock in, see change in volume. Subtract initial volume from final volume
What is the metric base unit for the following
Mass: grams
Volume: mL or cm3
Area:
You found a piece of gold lying on the side of the road one day and found that, by measuring it, has a mass of 60g. What would be its volume? (Hint: use your density table!)
3.11 cm3
what is the density of water?
1 g/mL
How does the density of an object relate to whether it will sink or float? Explain.
Things MORE dense than the liquid they’re in will SINK, things LESS dense than the liquid they’re in will FLOAT
Complete the following metric conversions.
5,287,945 mm = ___52.87945______ Hm
0.008 Kg = ______800_____ cg
0.048 L = _______48_______ mL
0.005 dg = ____.00005_________________ Dg
12,490 Dm = ____124,900________ m
When is it appropriate to use a bar graph when looking at data in science? Describe and give an example of a scenario that would best be shown by a bar graph.
a bar graph is used for COUNTED data…. For comparing different groups. Example: # of students with a birthday each month
When is it appropriate to use a line graph when looking at data in science? Describe and give an example of a scenario that would best be shown by a line graph.
a line graph is used to show trends in data, or data over TIME. Example: How the height of a plant changes over its life span.
When is it appropriate to use a pie graph when looking at data in science? Describe and give an example of a scenario that would best be shown by a pie graph.
Similar to bar graph but uses PERCENTAGES (out of 100%) to compare groups/categories. Example: Polling the % of students about their favorite pizza topping
What is the independent and dependant variable?
The independent variable is always on the X-AXIS,the thing you change
The dependent variable is always on the Y-AXIS,the one that will be changed(measurement)
What is the difference between a control group and an experimental group?
A control group is the group of people of part of an experiment that “does not receive the treatment” and is used for comparison to the groups that “do receive the treatment”, called experimental groups. For example, in an experiment where students are trying to find out whether listening to music for a certain amount of time while studying can improve test scores, the control group would be the group of students that DO NOT listen to any music while studying.
Constants are just aspects of an experiment that stay the same for each trial/test. For example, if you were trying to find out which brand of fertilizer is best for plant growth, a constant should be the type (or species) of plant you grow in each bed of fertilizer.
Identify the independent variable, dependent variable, 2 constants, and control group in the following scenario.
Scenario: A car sitting in the sun will get hotter than another if it has darker paint.
IV: Paint color or darkness of paint
DV: how hot the car becomes
2 constants: type of car used, length of time car sits in sun
Control Group: car with white paint… or no paint at all
Hypothesis (if, then format): Varies… an example would be, “if the car’s color is black, then it will get the hottest in the sun”.
If you have a cube with a length of 2,width of 4 and a Height of 3 what is the volume?
the volume can be found by multiplying length times width times height,so 2 times 4 times 3=24
A pie chart is showing the current composition of Earth’s atmosphere with the following segments:
Answer the following questions based on the data
Nitrogen: 78%
Oxygen: 21%
Argon: 0.93%
Water vapor:2%
What is the most abundant gas in earth’s atmosphere-nitrogen
what percentage of the atmosphere is oxygen-21%
how much more nitrogen is there than water vapor,expressed as a percentage-76%