quiz 1
暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
卡片预览 (24 张)
order matter from smallest to largest
atoms- molecules- molecular properties- macroscopic (bulk) properties
what is H2O
water molecule
How many atoms of each is in H2O
2 Hydrogen and 1 oxygen
properties of H2O
Stable; required for all known life
What is H2O2
hydrogen peroxide molecule
How many atoms of each in a hydrogen peroxide molecule?
2 Hydrogen, 2 oxygen
Properties of Hydrogen peroxide molecule
highly reactive; component in rocket fuel
Name of DHMO
Dihydrogen Monoxide (aka hydroxl acid)
Properties of DHMO
active greenhouse gas, major component of acid rain, major component to erosion, present in major storms, corrosive to metals, induces electrical failure
human health risks of DHMO
can cause severe burns, found in tumors, inhalation can be life threatening
A pure substance can be a ____ or ____
element or compound
Ex of pure element
H2 (hydrogen)
Ex of pure compound
H2O; Fe2O3
2 types of mixtures
homogenous: heterogeneous
What are the states of matter
solid, liquid, gas
Physical changes dont change ____
molecular composition
sublimation
solid->gas
deposition
gas-> solid
what is a chemical change
molecular composition changes; product molecules distinct from initial molecules
a production of CO2 and water is known as
clean burning
Intensive vs extensive
intensive doesnt depend on sample size; extensive does
identify the intensive and extensive variables of d=m/v
d=intensive; extensive= m&v
units of distance
km, m, cm, mm, (mu)m, nm
units of mass
kg, g, mg, Da