General Chemistry Answers

what is the concentration of a solution with a volume of 3.3ml that contains 12 grams of ammonium sulfite((NN4)2SO3)

Find the resulting temperature when 100 g of ice at 0oC is mixed with 1 liter of H2O at 35oC. 

Characterization of elements according to periodic table

Example., P-phosphorus, period-5, group-15 or Va; atomic number Z=15, number of protons P=15, number of electrons e=15; relative atomic mass Ar=31; nonmetal

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A glucose solution is frequently used as an intravenous (IV) solution to supply hydration and/or nutrition. Calculate amounts of glucose provided and volumes used.

A patient received 2.05 L of a 0.278 M glucose IV solution.

What quantity in moles of glucose were administered to the patient?

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Student A investigated the rate of reaction between calcium carbonate (marble chips) and hydrochloric acid. The student collected 10.0 cm3 of gas produced after 15 seconds.Student B investigated the rate of reaction between magnesium and hydrochloric acid. The student collected 19.5 cm3 of gas produced after 10 seconds.Which student’s investigation had a faster rate of reaction?

Which of the following statements are INCORRECT?

a.

In a bond, A-Y, the electronegativity difference between of two atoms determine how the A-Y bond breaks.

b.

If the atoms, A and Y, in the compound, AY, has electronegativity values that are almost the same, then the A-Y bond is polar.  

c.

The electronegativity of elements on the periodic table increases going from left to the right in each row.

d.

 Electronegativity is the property of the atoms forming a given bond, which determines the polarity of the bond.

Consider the following two compounds:

          CH₃CH₂CH₂CH₂CH₃   and   (CH₃)₂CHCH₂CH₃

 Which statement below is INCORRECT?

a.

(CH₃)₂CHCH₂CH₃ has the higher boiling point 

b.

CH₃CH₂CH₂CH₂CH₃ has the higher boiling point.

c.

Greater surface area leads to more intermolecular attraction which results in a higher boiling point.

d.

As the degree of branching increases, the surface area of the molecule decreases and the potential for intermolecular attraction via London forces decreases.

The reaction of bromine with propane in the presence of high heat or uv light gives primarily 2-bromopropane as the reaction product because:

a.

bromine forms reactive free radicals.

b.

propane easily forms free radicals

c.

bromine reacts with any alkane to produce predominantly a secondary carbon free radical intermediate.

d.

secondary carbon free radicals are more stable than primary carbon free radicals

Which of the following statements are INCORRECT?

a. Free radicals contain an unpaired electron.

b.Carbocations are electrophilic.

c.Carbanions are strongly acidic.

d.Carbocations are acidic.