Metric System
Metric Conversions
Variables
Identifying Variables
Mystery Science
100
Name the base units in the metric system and what they measure.
Gram - mass
Meter - length
Liter - volume
100
Convert: 34m= _____cm
3,400 cm
100
How many independent variables can you have in an experiment?
One
100
Which variable is purposely changed in an experiment?
The independent variable.
100
How long can a cockroach live without its head?
According to pestworld.org:
Cockroaches can live for up to one week without it's head because it does not breathe through it's mouth. It will die from dehydration because it cannot eat or drink.
200
What is the purpose of the prefixes in the metric system?
They express different multiples of 10.
200
Convert: 8.4 dekameters= _______ kilometers
.084 kilometers
200
What are confounding variables?
Variables that are not accounted for that can impact the independent & dependent variables and the results of the experiment.
200
In testing what type of wood will burn the longest in a fireplace, what would your dependent variable be?
The length of time the wood burned.
200
True or False:
You cannot taste food without saliva.
True: you need saliva to break down the chemicals found in food in order for them to be detected by your taste buds
300
1000 of these makes up a meter
What is a milimeter?
300
Express in terms of the smallest unit:
8L, 43mL
8,043 mL
300
Should you have multiple constants in an experiment? Why or why not?
You should have many to ensure the only thing that is being testing is the independent variable.
300
In testing what type of wood will burn the longest in a fireplace, what would some constants be?
- the amount of wood in the fireplace
- the type of fireplace
- the setting the wood is burned
- the arrangement of the wood in the fireplace
300
Do clouds have a significant mass?
Yes! Clouds can weigh up to one million pounds.
400
List at least 2 reasons why the metric system is preferred in science over the Imperial system.
- it's based on powers of 10
- it is standardized
- most of the world uses it, so they are familiar with it
- converting between units is easier (than the Imperial system)
- everything is based on base units
400
Compare the two quantities
95, 870 m ________ 958.70 km
95.870 m < 958.7 km
400
What is the purpose of the control group?
The control group shows what would happen without the independent variable being applied to the experiment.
400
You water three sunflower plants with salt water. Each plant receives a different concentration of salt solutions. A fourth plant receives pure water. After a two week period, the height is measured.
Find the IV, DV, and at least 2 CVs, and your control group
IV: concentration of salt water
DV: Height of sunflower
CVs: location, type of sunflower, amount of solution given, soil
Control Group: the pure water group
400
Can water boil and freeze at the same time?
500
When finding the volume using the displacement method, why do you need to read the graduated cylinder at eye level?
To read the meniscus that forms due to the properties of water.
500
Compare the two quantities
74,300,000 mm ________ 74.3 km
74,300,000 mm = 74.3 km
500
In determining the amount of sunlight that affects the growth of a daisy, this would be the independent variable.
What is the amount of sunlight.
500
Taylor sets up an experiment with her classmates testing study conditions. She has 3 experimental groups and gives each group the same study material to take the same test. There are 30 total 7th grade students who have the same teacher. Every group studies for 1 hour
Group 1 - studies in a library listening to classical music.
Group 2 - studies in an outdoor park listening to lofi music
Group 3 - studies in a classroom listening to jazz music
How can you make this experiment better?
Taylor needs to choose one independent variable. Right now she's testing the location and the music type. She should also have a control group with no music.
500
If you lit a fart on fire, what color would the flame be?
The flame would most likely be blue due to methane.