Other Chemistry Answers

name the apparatus to measure a solution of
Na2CO3
burette
pipette
conical flask
beaker

the concentration of the pure HCl used in a chemical reaction is
11.2cm3
V1
of 11.7 molar of
C1
of HCl is diluted to
250cm3
V2
, then the new concentration C_{2} will be __________.

1.936molesdm−3

0.936molesdm−3

0.125molesdm−3

1.125molesdm−3

When chemicals pour on the skin, the laboratory first aid is to ---------------.
Apply 1% sodium carbonate
Apply 1% boric acid solution
Flush the eye with a copious amount of clean lukewarm running water
Wash with soap and warm water

A flow of 1.4 MGD is treated with sodium silicofluoride (Na2SiF6) to provide a fluorideion dose of 1.3 mg/L. what is the feed rate in pounds per day? Commercial sodium silicofluoride has a purity of 98.5 percent and the fluoride ion purity as sodium silicofluoride is 60.7 percent.

1. What are the dimensions of the constant k in Coulomb’s law of electrostatics?
a.ML2T−4 T−2 A−1
b. ML2T3A−2
c. M −2 L3T2A−1
d. ML3T−4 A−2

2 Two charges Q 1 =500μC and Q 2 =100μC are located on the XY plane at the positions r 1 =3j ⃗ m and r 2 =4i ⃗ m. Find the force exerted on the Q 2

a. 14.4i ⃗ +10.8j ⃗ N

b. 14.4i ⃗ –10.8j ⃗ N

c. 10.8i ⃗ –14.4j ⃗ N

d. 10.8i ⃗ +14.4j ⃗ N

If you have 100 g of NaOH and 100 g of Al to perform the reaction, how many grams of H2 will you produce?
6NaOH(aq) + 2Al(s) ® 2NA3AlO3(s) + 3H2(g)

what is the frequency of light having a wavelength of 691 nm? what is the wavelength(in nm) of radiation having a frequency of 4.29*10^9 Hz? ( the radiation is in the microwave region)

a) frequency of light?
.....*10^... Hz

b) Wavelength of radiation?

.....*10^.... nm

explain the shapes of 1s and 2py orbitals of an atom
with one electron. (

A gas has a density of 1.234g/L at STP

1 mole = 22.4 or 22.4L = 1 mole