Final Flashcards
Define purpose of an experiment
A 2-3 sentence summary of what you want to find out by conducting the experiment or the question that the experiment will answer
Independent Variable
What you change
Dependent Variable
What you measure, depends on what you change
Controlled Variable
Constant, what stays the same
Conclusion of an experiment
Summarize how your results support or contradict your original hypothesis
Density formula
D=m/v
Metric system acronyms
King kilo Henry hecta Died deka By base (m, l, g) Drinking deci Chocolate centi Milk milli
Convert from celsius to kelvin
C+273
Convert from celsius to fahrenheit
(9/5)(C)+32=F
Convert Fahrenheit to celsius
(5/9)(F-32)=C
Accuracy
how close a measurement is to its standard or known value
Precision
how close two or more measurements are to each other, regardless whether those measurements are accurate or not
X axis is independent or dependent variable
independent variable
Y axis is independent or dependent variable
dependent variable
Sig fig rules
- All digits 1-9 are significant.
- Zeros between 1-9 are significant. Ex: 5007
- Trailing zeros: counted for if decimal
- Zeros only to place decimal point are NOT significant Ex: 0.00025
- Zeros following a decimal sig fig are significant Ex: .470000
Chemical properties
properties that can be observed only when substances interact with one another
(Did you make something new?)
Examples of chemical properties
rust
explosion
oxidation reduction
Evidence of a chm rxn
change of color formation of ppt odor change in temp combustion
Physical properties
properties that can be observed or measured without changing the composition of matter
Examples of physical properties
texture mass volume length width height taste odor malleability flexibility viscosity hardness
Examples of physical changes
melting cut wood phase changes break glass color
Physical change
a change that effects only physical properties
Chemical change
a change that produces one or more substances
Element
cannot be further broken down by ordinary chemical means