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| the substance of which any physical object consists or is composed |
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- an educated guess based on research
- made prior to the experiment
- which data analysis of the experiment either supports or denys
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| an act of noticing or perceiving during an experiment as a way of collecting data |
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| the use of your senses to observe in an experiment |
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| observations based opon what is recordable, measureable, and numerical data |
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| the amount of matter a given space can contain |
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| how to calculate the volume of regular shaped objects |
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| length x width x hight= volume |
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| how to read a graduated cylinder |
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- at bottom of miniscus; the dip of water
- read to guess value ; the guess is either 0 or 5
- to 3 decimals
- at eye level
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| what happens to salt's mass when mixed in water |
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| what happens to the mass of ice when melted |
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| what happens to the mass of copper and sulfer when heated |
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| physical change vs chemical change |
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- physical change can be reverse; chemical change cannot
- physical change does not create a new substance; chemical change does
- in a physical change the chemical compound is the same; in a chemical change the chemical compound is altered
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| In all changes the mass stays exactlly the same provided nothing is added or escapes |
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| a natural or physical phenomenom that occurs the same way every time |
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a method used by scientist to make very big or very small numbers easier to read or write
for example;
- .000034= 3.4 x 105
- 34,000,000,000= 3.4 x 1010
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| the change in mass in an expiremint |
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| the initial mass the mass before the expiremint is performed |
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| the mass after the performance of the expiremint |
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the formula is
Mf -Mi= MΔ |
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a change in the physical properties of a substance such as size or shape ; usually reversable
- example ice melting
- wood burns
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usually irreverseable change involving the rearrangement of atoms of one or more substances and a change in their chemical properties or composition resulting in the formation of at least one new substance
- example sulfer and copper heated = copper sulfate
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