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69 Cards in this Set

  • Front
  • Back
Hypothesis?
a tentative explanation for what has been observed
Independent variable?
the variable that you plan to change
Dependent Variable?
the variable whose value depends on the independent variable
Control in a experiment the standard used variable for comparison

In an experiment how many variables can be changed at a time?
one
What is the difference between Theory and scientific law?
■A theory is an explanation of a natural Phenomenon based on many observations and investigations over time Scientific aw is a relationship in nature that is supported by many experiments.
The systematic approach used in scientific studies is called the?
Scientific Method
Evolution is an example of a?
Theory
Si unit of mass is the?
kilogram
Si unit of time is?
Second
Si unit of length is?
meter
Si unit of volume?
Cubic meter
Formula of mass?
Volume x Density
Temperature?
Celsius and Fahrenheit
Formula for density?
density= mass/ volume
Accuracy?
Refers to how close a measured value is to an accepted value
Precision?
Refers to hoe close a series of measurements are to one another precise measurements show little variation over a series of trials but might not be accurate
Density?
The amount of mass per unit volume a physical property
Scientific notation?
can be used to express any number as a number between 1- 10 (coefficient) multiplied by 10 raised to a power (exponent) When the exponent is negative it is a small number and when it is positive it is a big number
Significant figures?
all known digits plus one estimated digit.
If all of your darts hit the bulls eye you have been?
Both accurate and Precise
If all your darts hit the wall near each other away from the bulls eye you have been?
precise
Chemistry is the study of?
matter and its changes
Matter is divided into two categories ?
Mixtures and pure Substances
Mixtures can be?
homogeneous or heterogeneous
Pure substances are either ?
elements or compounds
Heterogeneous mixture?
is a mixture that does not bend smoothly throughout and which the individual substances remain distinct.
Homogeneous mixture?
is a mixture that has constant composition throughout it always has a single phase
Physical change?
alters a substance without changing composition
Chemical Change?
involves one or more substances changing into a new substance.
Mixture?
is a combination of two or more pure substances retains its individual chemical property
What is a physical property?
is a characteristic that can be observed or measured without changing the samples compositions.
What is a chemical property?
is the ability of a substance to combine with or change into one or more other substances
Physical changes?
are changes that do not create a new substance (state changes
Compound?
- is made of two or more different elements combined chemically
______are elements on the left side of the periodic table that are often shiny solids that conduct electricy
Metals
Element?
a pure substance that cannot be separated into a simper form
Chemical Properties can be determined by ?
changing the substance most commonly chemical properties include the REACTIVITY of a substance
Physical properties can be determined ?
without changing a substance ex color density and solubility
Chemical Properties can be determined by ?
changing the substance most commonly chemical properties include the REACTIVITY of a substance
Chemical changes?
are changes that create a new substance
Physical properties can be determined ?
without changing a substance ex color density and solubility
What is a physical property?
is a characteristic that can be observed or measured without changing the samples compositions.
What is a physical property?
is a characteristic that can be observed or measured without changing the samples compositions.
Physical changes?
are changes that do not create a new substance (state changes
Solution is?
homogeneous
Solution is?
homogeneous
What is a chemical property?
is the ability of a substance to combine with or change into one or more other substances
______are elements on the left side of the periodic table that are often shiny solids that conduct electricy
Metals
Chemical changes?
are changes that create a new substance
Compound?
- is made of two or more different elements combined chemically
What is a chemical property?
is the ability of a substance to combine with or change into one or more other substances
Compound?
- is made of two or more different elements combined chemically
______are elements on the left side of the periodic table that are often shiny solids that conduct electricy
Metals
Element?
a pure substance that cannot be separated into a simper form
What is a physical property?
is a characteristic that can be observed or measured without changing the samples compositions.
Physical properties can be determined ?
without changing a substance ex color density and solubility
What is a chemical property?
is the ability of a substance to combine with or change into one or more other substances
Element?
a pure substance that cannot be separated into a simper form
Physical changes?
are changes that do not create a new substance (state changes
Compound?
- is made of two or more different elements combined chemically
Chemical Properties can be determined by ?
changing the substance most commonly chemical properties include the REACTIVITY of a substance
______are elements on the left side of the periodic table that are often shiny solids that conduct electricy
Metals
Chemical changes?
are changes that create a new substance
Physical changes?
are changes that do not create a new substance (state changes
______are elements on the left side of the periodic table that are often shiny solids that conduct electricy
Metals
Chemical Properties can be determined by ?
changing the substance most commonly chemical properties include the REACTIVITY of a substance
Element?
a pure substance that cannot be separated into a simper form
What is a chemical property?
is the ability of a substance to combine with or change into one or more other substances
Compound?
- is made of two or more different elements combined chemically