Nature of Science
Nature of Science - Part 2
Chemistry of Life
Chemistry of Life - Part 2
Measurement
100
What is Science?
a way of knowing about the world, it is based on experiments.
100
What are the 6 steps in the scientific method?
1. Ask a question
2. Background research
3. Construct hypothesis
4. Experiment
5. Analyze data
6.Draw conclusion
100
What is the chemical formula of water?
H20 - two positive hydrogens and one negative oxygen
100
6 elements necessary for life
Carbon (C), Hydrogen (H), Oxygen (O), Nitrogen (N), Phosphorus (P), Sulfur (S)
100
What instrument do we use to measure length?
Ruler
200
Fact vs. Law. vs. Theory
F- verifiable observation
L- describes patterns, explain how
T- explain an observation, explain why
200
This is the variable that YOU change in order to test something.
Independent Variable
200
What is a molecule that has uneven electrical charges?
Polar molecule
200
What are the 8 levels of organization for life?
atom
molecule
cell organelles
cell
tissue
organ
organ system
organism
200
The triple beam balance measures what property?
weight and mass
300
Observation vs Inference
O- description using the five senses, not an opinion
I- A guess based off passed experiences
300
What is the Dependent Variable?
The variable that responds to your changing of the independent variable.
300
Solute vs. Solvent
Solute- what gets dissolved
Solvent- does the dissolving
300
What are the 5 special properties of water?
cohesion
adhesion
high specific heat
less dense as a solid
universal solvent
300
What instrument measures temperature?
thermometer
400
What is the word that describes qualities such as shape, color, size, taste, touch, smell and feel?
Qualitative
400
What is the group in an experiment that stays the same and is being used to compare with?
Control Group
400
When placed in the same container, why do oil and water not mix?
Water is polar, oil is nonpolar
400
How does adhesion impact life?
Allows for capillary action, i.e. move water up the stems of plants.
400
What is the length of this line?
7 cm
500
Precision vs Accuracy
P- How close your measurements are to each other
A- How close your measurement is to the correct value
500
Sue wants to know which fertilizer will make her plant grow more or less than just water. She sets up an experiment.
List the dependent variable, independent variable, constants, and control.
Sue wants to know which fertilizer will make her plant grow more or less than just water. She sets up an experiment.
IV- Brands of fertilizer
D- Height of plants
Constants- Water, soil, sunlight, plant type
Control- Plant that just gets water
500
High specific heat
Temperature that does not change easily
500
How does ice density impact life?
Ice floats on top of water, so fish can live underneath the ice.
500
Which side of this ruler do we use in science?
Centimeter side.