scientific method
what is the method in order?
1. observation (process of gathering info)/ asking question
2. creating a hypothesis (scientific observation for a set of observations)
3. design a controlled experiment
4.record and analyze results
5. create conclusion and share
what are metric units also called?
SI units
what are quantative and qualitative data?
quantative data is how much of something is obsereved/ measured in #s
qualitative data include descriptions, characteristics, and other info that cant be measured in #s
density?
amount of mass per volume
d = mass/volume
units = g/cm cubed
how must a hypothesis be stated?
in a way that is testable
what are the 7 SI units?
Length, mass, time, tempuature, amount of substance, electric current, and Luminous intensity
how do you write scientific notation?
4.6*1017
what do u do the water displacement method do?
Used to find the volume of an irregularly shaped solid - the object is submerged in water. The change in water level is equal to the volume of the object (1 mL = 1 cm cubed)
what is a controlled experiment?
an experiment that works with one variable at a time, has a control and a experimental group. control group is a comparing point and experimental group shows the results of the variable being tested
what are the advantages of the SI system?
- make measuring and calculating easier bc everything is expressed in decimals
- all base ten so easy to change from one unit to another
- universally understood
what does analysis mean?
the process of studying data to detect patterns or meaning
how do we organize and explain data?
Data tables and graphs
the independent and dependent variables definitions, compare and contrast
independent variable is on the x-axis and dependent is on the y-axis. dependent is the variable being observed in the experiment, the data we collect. independent variable is the variable deliberately changed by the scientist in order to get results
what are conversion factors?
numbers that are used to change from one unit to another.
what is a controlled experiment?
an experiment in which all variables, other than the one being tested, are held constant so we can be certain which variable caused results (one variable is manipulated at a time)
what is data analysis?
The process of finding the relationship (pattern or trend) among data (between variables)
how is a theory different from a hypothesis?
hypothesis is an educated guess that is tested/can be tested by research and evidence. a theory is a broad statement that is widely believed to be true bc lots of evidence
what are the base units for the SI?
length: meter
volume: liter or cubic meter
mass: kilograms
precision? accuracy?
- precision: the exactness of a measurement, the degree to which the results of an investigation show the same results (close to each other, not necessarily close to the target)
- accuracy: how close to the true or actual value the measurement is (close to a target number or goal)
percent error?
the absolute value of the error divided by the accepted value, multiplied by 100%