S
C
PIESE
What is the electron configuration for La (lanthanum)?
TELE
FEN
ESCO
TELE
le
LOPETER
HER
HERBAL
RE
malt
III
TE
EFTE
DIESEL
ELE
REEDER
N E
O A. [Xe]625d
O B. [CS]6s25d
O C. [Kr]6s254
O D. [Rn]6s25d!
PETER
RE
ARE
TE
EPERTI
LEHEN HE
lül
THERE
HERE
HELFE
TER
HER
THIES
ARRILARE
FE
LE
FILM
all
ES
ht
1
MAH
O
EUR
KHUSHI
HERE
SHERS
_
ESSEN
TELE
TEATEEL
ES
RE
RETTET
ENTER
NE
DE

Achemical reaction (also known as a chemical change) produces substances that are chemically different from the starting materials. an example of a chemical reaction is the formation of water from hydrogen and oxygen gas. in a physical change, a substance changes its physical appearance but not its chemical identity. an example of physical change is the formation of liquid water from solid water, a familiar process called melting. physically, liquid water looks very different from solid water (ice) but the chemical identity, water, is the same for both. which of following changes that affect the composition of our atmosphere involve physical changes and which involve chemical reactions? oxygen gas changes to ozone during thunderstorms carbon dioxide is produced by the combustion of gasoline in an automobile engine. when coal, oil, and natural gas are decomposed in landsills they produce methane gas. freezing rain develops when a warm air mass overrides a cold air mass. fog forms from water vapor when the temperature drops below the dew point

Asample of ammonia reacts with oxygen as shown. 4nh3(g) + 5o2(g) 4no(g) + 6h2o(g) what is the limiting reactant if 4.0 g of nh3 react with 8.0 g of oxygen? o2 because it produces only 0.20 mol of no. nh3 because it produces only 0.20 mol of no. o2 because it produces two times less no than nh3. nh3 because it produces three times more no than o2.

Identify a specific example for each type of technology