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Solve the following problems using the correct format. Given first, what is asked for, and the formula together with the solution.
- A gas occupies a volume of 400 cm3 at a pressure of 2.00 atm. What would be the new pressure if the volume is increased to 500 cm3 ?
- The volume of a given gas was 50 cm3 at 260C. After heat was applied to the gas, its volume increased to 80 cm3 . If the pressure was held constant, what is the new temperature of the gas?
A drop of liquid bromine is placed in the bottom of a gas jar.brown fumes of bromine vapour slowly spread through the covered jar.
Why does this happen?
A.bromine vapour is less dense than air
B.Bromine molecules and the molecules in the air are always moving around
C.Bromine molecules are smaller than the molecules in air
D.Bromine molecules move faster than the molecules in air
Which is the answer and explain all the options.
You have been given this soil analysis report and are requested are requested to make
a fertiliser recommendation for production of sweet-corn using the brown book, the
Fertiliser Society of South Africa. The expected yield is 30
tons per hectare of fresh cobs.
You received results from an accredited laboratory. the Bray 1
reads 13 mg per kg of soil, while the K (NH4OAc method) reads 98 mg per kg of soil.
Calculate how many kg per ha of N, P, K will you need to apply according to the analysis
results, considering guidelines in the three attached pages from the Fertiliser Handbook.
Use the Kynoch fertiliser mixture list to recommend a fertiliser mixture, then
calculate the kg per ha of this fertiliser mixture and LAN (lime ammonium nitrate) straight
fertiliser for topdressing-N at between four and eight weeks after planting
Hint: You will be band-placing mixture and topdressings-N fertilisers, and only up to 300
kg per ha of fertiliser is recommended in this fertiliser placement strategy.
Oxygen gas inside a 1.5 L gas tank has a pressure of 0.95 atm. Provide the temperature remains constant, how much pressure is needed to reduce it's volume by 1/2
1.The pH sample of human blood was measured to be 7.41 at 25 degrees celsius. Calculate the hydrogen ion concentration, H' and hydroxide ion, OH for the sample.
Do carbon filters in face masks offer more protection against corona virus?How?
What is the identity of element X in this equation? 4219K-->4220X + 0-1ß
Choose the substance in each pair with the higher entropy. 1 mole of N,(1) or 1 mole of N, (g) b. 3 moles of CH, (g) at 25°C or 2 moles of CH, (g) at 25°C c. aqueous d. 1 mole of HCl at standard conditions or 1 mole HCl at 60°C and 0.8 atm
A plant extract was analyzed by UV- vispectroscopy and the following data was obtained what is the moral absorptivity of the chromophore?
Conc-(M) absorbance
5×10- 5 0.051
10×10-5 0.098
15×10-5 0.157
2) Balance the following reactions by half-reaction method. Identify the oxidizing agent and the reducing agent. Show your process in balancing the reactions.
O.A. R.A.
a. Fe3+ + Sn2+ Fe2+ + Sn4+
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