Vocab
basic complete unit of matter
atom
letter or letters that represent an element
symbol
research whose goal is simply to learn about how something works is called
basic research
2.4 dm = ____________m
0.24
a sample containing multiple substances that are easily discerned from one another
a particle made of more than one atom bonded together
molecule
a vertical column on the periodic table is called a...
group/family
tools or inventions made to make a task easier or more efficient
technology
the amount of matter in a sample is...
mass
Two examples of extensive properties
length, mass, volume, weight
Something with a fixed and defined chemical composition
pure substance/chemical
A horizontal row on the periodic table
period
Branch of chemistry that studies how to isolate or quantify certain substances
analytical
A way to separate a mixture by spinning the sample forcing larger molecules downward
centrifuge
Types of atoms, categories of nearly identical atoms
elements
elements are in a __________ if they have similar chemical properties
group
branch of chemistry that studies carbon-containing compounds
organic
Use sigfig rules.
4.58 cm + 2.199 cm + 7.8 cm =
14.6 cm
A way to separate a mixture based on the speed or distance the parts travel through a medium
chromatography
intensive properties
elements with properties between metals and nonmetals are _____________, an example would be ___________
metalloids, silicon
branch of chemistry that studies the properties of matter and substances
physical
Use sigfig rules:
5.6 cm x 5.112 cm =
29 square cm
Describe what is happening in a chemical change and contrast it with a physical change
chemical changes make new substances (break/form chemical bonds) while physical changes make the same substance look different somehow