A
Is air a pure substance or a mixture?
mixture
a single kind of matter that is pure and has a specific set of properties
substance
Is sugar a pure substance or mixture?
Pure substance
molecule
a neutral group of two or more atoms held together by covalent bonds
two or more substances that are together in the same place but their atoms are not chemically bonded
mixture
Atom
Basic unit of everything
chemical property
A characteristic of a substance that describes its ability to change into different substances
A pure substance that cannot be broken down into other substances by chemical or physical means
element
A substance made of two or more elements chemically combined
compound
a measure of how much matter is in an object
mass
volume
the amount of space that matter occupies
weight
a measure of the force of gravity acting on an object
the measurement of how much mass of a substance is contained in a given volume
density
change in form
convert
distill
separating liquids by boiling them
physical change
A change that alters the form or appearance of a material but does not make the material into another substance
conservation
matter is neither created nor destroyed
What is an example of plasma?
Lightning
Explain what state of matter aerogel is in.
Solid- can maintain a stable state, retains its shape, withstand pressure
Why do scientists use SI (or metric) system?
To prevent confusion. Some places use the metric and some use standard. Science always uses metric.
one or more substances combine or break apart to form new substances
chemical change
How do we figure out an objects density?
Density= mass/volume
What does it mean for matter to change phases?
Changing from one form to another- solid to liquid.
physical property
a characteristic of a pure substance that can be observed without changing it into another substance
What are the 5 most common steps to the scientific method?
1. Observation
2. Hypothesis
3. Test
4. Conclusion
5. Theory