Based on their position in the peeriodic table, which atom would you predict to form a compound with one chlorine atom and 2 bromine atoms respectively? a. potassium, magnesium b. carbon, lithium c. boron, sodium d. calcium, carbon e. aluminum, aluminum

General Chemistry

please write it by your own don't copy from the internet send it by email [email protected]

Analysis Based: [Any 2 in less than 200 words]

1. The sun emits a lot of heat and light, what kind of reaction happens in the sun.

2. List out 5 activities/phenomenon where you see the influence of chemistry your daily life

3. Has Chemistry benefitted Human Life? Support your view with 2 important incidents from history.

4. Research and write the incident/scientist [less than 200 words] that led to the discovery of

 Pencillin

 Radioactivity

 Insulin

Arrange the following gases in order of increasing rate of effusion at 298 deg K. (Hint:

Look up the correct chemical formulas of these.)   

a. Argon       b. Hydrogen bromide         c . Ethane (formula?)       d. Carbon monoxide

__________ ___________ ____________ _____________ Slowest      

2- a. Under what two circumstances is the ideal gas equation not obeyed by ordinary gases?

b. What is the importance of van der Waals equation?   

In a laboratory experiment, 2.0 g of aqueous lead (II) nitrate was mixed with 2.0 g of aqueous sodium chloride. Upon completion of the experiment, 0.65 g of lead (II) chloride were obtained.

a) Provide the balanced equation.

b) What is the limiting reactant?

c) What is the theoretical yield?

d) What is the percent yield?

4. which of the following is most likely to exhibit covalent bonding

a. MgCl2 b. NaCl c. OCs2 d. SO2 e. LiF

it is either c or d not sure which is most covalent

Is the world CHIRAL ?

-rationalize your idea

During an adiabatic expansion of an ideal gas, which stays constant?

a) U

b) H

c) S

Internal Energy stays constant?

Which one of the following is true?

a) The entropy of an isolated system can only stay constant or increase during a process

b) We can construct a heat engine that extracts heat from a hot reservoir and delivers an equal amount of work

c) We can construct a refrigerator whose sole effect is to transfer heat from a cooler object to a hotter one

Entropy of isolated system stays constant?

Thank you!

Experiment shows that the reaction 6I−(aq) + BrO3 −(aq) + 6H+(aq) ⟶ 3I2 (aq) + Br−(aq) + 3H2O(l) obeys this rate law: rate = k[I- ][BrO3 ][H+] 2 .

(a) What is the reaction order in each reactant and the overall reaction order?

(b)By what factor does the rate change if [I−] and [BrO3 −] are tripled and [H+] is doubled?

The second order reaction 2A₂B_{3 ----->} A₄B₆ has a rate constant, k, of 7.35 x 10^-3M^-1S-¹ at a certain temperature. If [A₂B₃]₀ = 1.32M, how much time (s) does it take to reduce the concentration to 27% of the original? (please explain)

The decomposition of hydrogen peroxide H₂O₂(l) ---> H₂(g) + O₂(g) has a rate constant of 1.06 x 10-3min^-1. how long (min) will it take for the concentration of H2O2 to decompose by 60%? (please explain)

the decomposition of M3X2(aq) <--> 3M(s) + X2(g) has an activation energy of 15- kJ/mol and (delta)H_rxn = -72kJ/mol, under specified conditions. what is the activation energy (kJ/mol) for the reverse reaction?

the equilibriium constant, Kp has a value of 6.5x10^-4 at 308 K for the reaction of nitrogen monoxide with chlorine.     2NO(g)+Cl₂(g) <---> 2NOCl(g)... at 308K what is the value of Kc? (please explain)

Carbonic acid (H2CO3) is a weak diprotic acid with Ka1=4.43�10?7 and Ka2=4.73�10?11. When sodium bicarbonate (NaHCO3) is titrated with hydrochloric acid (HCl), it acts as a weak base according to the equation

NaHCO3(aq)+HCl(aq)?H2CO3(aq)+NaCl(aq)

1)What volume of 0.180M HCl is required for the complete neutralization of 1.50g of NaHCO3 (sodium bicarbonate)?

2)What volume of 0.120M HCl is required for the complete neutralization of 1.10g of Na2CO3 (sodium carbonate)?

3)A sample of NaOH (sodium hydroxide) contains a small amount of Na2CO3 (sodium carbonate). For titration to the phenolphthalein endpoint, 0.160g of this sample requires 23.98 mL of 0.100 M HCl. An additional 0.700 mL of 0.100 M HCl is required to reach the methyl orange endpoint. What is the percentage of Na2CO3 by mass in the sample?

1.

a) You have the following mixture by mass:

10% H+
6% He+
50% C3+
20% O2+
5% Fe4+
4% N2+
5% Mg+

Calculate the mean molecular weight, in units of mH (mass of hydrogen).

b) You are designing a mixture of neutral gas for a new rocket. For the reaction to take place, you need 10%
of oxygen by mass. Because of the payload restriction, the mean molecular weight of the gas must be
equal to 4 mH (mass hydrogen). Because of budget restriction, you are only allowed to mix the oxygen with 2 other
monoatomic gasses. Solve this problem, and provide a verification that your calculation is right.

An ideal gas mixture contains 220 mg N2 and 110 mg of O2. If the partial pressure of O2 at 27 oC is 19.8 kPa determine

(a) The total pressure
(b) The molar volume of the mixture
(c) The collision frequency, (i) zN2-O2 (ii) zO2-N2
(d) The mean free path of both gases
(e) The collision density (i) ZN2-O2 (ii) ZO2-N2
Given, the collision diameters of N2 and O2 are 3.75 and 3.61 Å, respectively.

1. A chemistry student five possible Lewis structures for the cyanate ion.

1. Give a reason why structures (4) and (5) are wrong. (2)

2. Calculate the formal charge of each individual atom and determine which structure is the preferred one. (11)

Structure 1

Structure 2

Structure 3

            _____________________________________ is the most stable structure.

            _____________________________________ is the least stable structure.

1a. Arrange BaS,  GaP,  CaO,  RbCl in order of decreasing lattice energy. (2)

1b. Arrange KBr,  InAs,  LiCl,  SrSe,  ZnS in order of increasing lattice energy. (

When plotting a calibration curve to use for ion chromatography, would it be better to use peak area or peak height vs concentration ? Is the R-squared value a good basis for which to choose?