Other Chemistry Answers

Find proportions of each ingredient including the amount of water you must start with.

Ca(NO3)2-SiO2 composite gel electrolyte was prepared with a sol-gel method, Ca(NO3)2 aqueous solution was firstly prepared by adding Ca(NO3)24H2O in deionized water. Then 90%wt of 2 M Ca(NO3)2 solution, 10wt% of SiO2 powder (as gelating agent) and 1wt% carboxymethylcellulose

17 What is the product formed when you dehydrate an alcohol?
Alkene
Alkane
Alkyne
Ester
18 What is the mole fraction of each component if 3.9 g of benzene
(C6H6)
(C6H6)
is dissolved in 4.6 g of toluene
(C7H8)
(C7H8)
?
0.50 each
0.10 each
0.05 each
0.01 each
19 The maximum capacity of the top-loading machine is ____________.
620 g
210 g
110 g
None of the above
20 ____________ is used to hold flasks and crucibles when they are hot.
Bunsen burner
Spatula
Tong
Holder
Submit

12 If you weighed a hot object on the balance, the reading would be _____________.
Same
Higher
Lower
None of the above
13 Solids are usually purified by the method of ____________.
fractional distillation
distillation
crystallization
All of the above
14 Which of these helps you to keep solutions at a constant temperature while stirring?
Magnetic stirrer
Hot plate stirrer
Mechanical stirrer
Stirrer motor
15 What is the maximum capacity of the analytical balance?
110 g
210 g
620 g
None of the above
16 What would you use to achieve a constant stirring?
Magnetic stirrer
Hot plate stirrer
Mechanical stirrer
Stirrer motor

6 During the same experiment, one must be careful to always use _____________balance.
Different
Same
Various
None of the above
7 Which of these is not a component of the bunsen burner?
Tong
Chimney
Air vent
Needle valve
8 If a procedure tells you to "add about 3 g of ammonium sulphate", which balance would you use?
Analytical balance
Top-loading balance
Spring balance
All of the above
9 Which of these is more suitable for accurate measurement of mass?
Spring balance
Top-loading balance
Analytical balance
None of the above
10 Which of these is not a use of the bunsen burner?
Sterilization
combustion
Heating
Measuring
11 ____________ is the temperature at which the vapour pressure of a liquid equals atmospheric pressure.
Absolute point
Boiling point
Normal boiling point
All of the above

1 Which of the following is not a laboratory safety rule?
You should never mix acids with bases
You should tie back your long hair
You should never add water to acid
You should never pour chemicals down the sink
2 Which piece of laboratory equipment can be used to store chemicals for a long period of time?
Burrette
Evaporating dish
Beaker
Pippette
3 Which of these is not a correct use of the bunsen burner?
Turn off the gas valve after use
When not using the bunsen burner for a while, open the air-hole
Never leave the flame unattended
Open the air hole slowly
4 Which of the following can cause error during weighing?
Presence of air currents in the lab
Balance door being open
Non-equilibration of balance
All of the above
5 If you weighed a cold object on the balance, the reading would be _____________.
Higher
Lower
Same
None of the above

1.62 g H2 is allowed to react with 10.3 g N2, producing 1.09 g NH3

What is the theoretical yield in grams and the percentage yield for this reaction under the given conditions?

If you have 2 molecules of hydroxide (2HO) and 2 atoms of hydrogen, what process would you take to yield 2 H2O or water?( 2HO 2H )

Calculate the number of normal modes of vibration of brf5 and xef2

Calculate the number of normal modes of vibration of brf5 and xef2

calculate the number of normal modes of vibration of brf5 and xef2