Physical Science Flashcards
Define: molecule
Two or more atoms linked together to make a substance with unique properties
Define: concentration
The quantity of a substance within a certain volume
Fifty grams of carbon disulfide can be broken down into 42.1 grams of sulfur and 7.9 grams of carbon. Is carbon disulfide made up of atoms or molecules?
Carbon disulfide is made up of molecules. Since it can be broken down into smaller components, it must be made of molecules. If it were made of atoms it could not be broken down into smaller units.
If you put iron near a magnet, the iron will be attracted to the magnet. Rust is made up of molecules that contain iron and oxygen atoms. Rust is not attracted to a magnet. If rust contains iron atoms, and iron is attracted to a magnet, why isn’t rust attracted to a magnet?
Because when an atom is a part of a molecule, the molecule does not take on the characteristics of an atom. Instead the atoms in the molecule join together in such a way as to give the molecule its own characteristic.
A statue is made out of copper and displayed outside. After many years, what color will the statue be?
The statue will eventually turn a shade of green. This comes from the copper atoms reacting with carbon dioxide in the air the make copper hydroxycarbonate
Have scientist actually seen atoms?
Scientist have not
Give the numerical meaning for the prefixes “centi” milli and killo
Centi means 0.01
Milli means 0.001
Kilo means 1,000
If you wanted to measure an objects mass, what metric unit would you use? What English unit would you use?
Mass is measured in grams I
In the metric system. In the English system they are measured in slugs.
If you wanted to measure an objects volume, what metric unit would you use? What English unit would you use?
Volume is measured in liters for the metric system. In the English system, volume is measured in gallons
If you wanted to measure an objects length, what metric unit would you use. And what english unit would you use?
In the metric system, length in measured in meters. In the English system it is measured in feet, yards, inches or miles.
Define: atom
The smallest chemical matter
How many centimeters are in 1.3 meter?
Since we want to convert from meters to centimeters, we need to remember that centi means 0.01. So 1 centimeter is the same thing as 0.01 meters. Thus: 1 cm = 0.01 m. Next we write measurement as a fraction: 1.3m/1. Now we can use our conversion relationship. Since we want to end up with cm at the end, we must multiply the measurement by a fraction that has meters on the bottom (to cancel the meter unit that is there) and cm on the top (so that cm is the unit that we are left with.) remember the numbers next to the unit in relationship above go with the units. Thus since m goes on the bottom of the fraction, so does 0.01. Since cm goes on the top, so does 1.
1.3/1 X 1 cm/0.01m = 130 cm
