Need calculating the molecular weight and finding the correct formula for

1.) barium sulfide
sodium acetate
potassium phosphate

2.)which of the following contains both ionic and covalent bonds? which are purely ionic? which have only covalent bonds?

h3po4
kno3
nh3
kcl
co2

3.) rank the following compounds from smallest to largest lattice energy. (lowest to highest melting point.)

cao, csi, bas, naf, nacl

4.) can you show me the calculation part when determining how any valence electrons for these
sih4
brf3
h2co

i can draw the lewis structure for each one after that from here also do you know how many lone and bond pairs does formaldehyde have

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure  

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.

11 players on a field that has a maximum of 11 players

answer: i have one answer

acids are substances that ionize (break off) in an aqueous solution to produce hydrogen (h+) ions

explanation:

hope this and sorry i could only come up with one answer!