Other Chemistry Answers

4 Which statement about benzene is correct?
Benzene is an isomer of cyclohexane
The ratio of carbon to hydrogen atoms in benzene is the same as in ethyne
Benzene reacts with bromine solution as if it is saturated
Benzene undergoes addition reaction more readily than hexene.
5 Which of the following condensed formulae is accurate for 2,2-dimethylbutane?

CH3C(CH3)2CH2CH3
CH3C(CH3)2CH2CH3

CH3C(CH3)CH2CH3
CH3C(CH3)CH2CH3

CH3(CH3)2CH2CH3
CH3(CH3)2CH2CH3

CH3C(CH3)2CH2CH3
CH3C(CH3)2CH2CH3
6 Which of these compounds is a saturated hydrocarbon?
Ethene
Ethane
Ethyne
Ethanol

1 Which of the following is a recrystallization solvent?
Diethyl ether
Water
Ethanol
All of the above
2 Which statement explains why the element "Carbon" forms so many compounds?
Carbon atoms combine readily with Oxygen
Carbon atoms have very high electronegativity
Carbon atoms readily form ionic bonds with other carbon atoms
Carbon atoms readily form covalent bonds with other carbon atoms
3 Dehydration of an alcohol leads to the formation of an ____________.
Alkane
Alkene
Alkyne
Aldehyde

19 Which of these is useful in suction filtration set ups?
Round-bottom flask
Filter flask
Beaker
Evaporating dish
20 The S.I. unit for length is ___________.
Inches
Feet
Metres
Grams

16 Which of the folowing dresses is inappropriate to wear in a laboratory?
shirt with rolled up sleeves
loose sleeves
cloth lab coat
rubber lab apron
17 Which of these flasks is useful in a distillation process?
Round-bottom flask
Erlenmeyer flask
Filter flask
Conical flask
18 Which of these laboratory apparatus may be used to crush solids into powder?
Tongs
Mortar and pestle
Crucible
Grinding machine

Classify each of the following substances as either a Lewis acid or a Lewis base:
a. Cl-
b. CO32-
c. Na+
d. Br-

. A train is carrying three cars of concentrated phosphoric acid (assume that it is 85% by weight) to deliver it in a manufacturing plant. The train got into an accident and all of the acid were spilled due to derailment. If 150,000 lbs of potassium hydroxide was used to neutralize the acid, what is the amount (in kg) of concentrated phosphoric acid that was spilled due to derailment?
H3PO4 +KOH ® K3PO4+ H2O

A train is carrying three cars of concentrated phosphoric acid (assume that it is 85% by weight) to deliver it in a manufacturing plant. The train got into an accident and all of the acid were spilled due to derailment. If 150,000 lbs of potassium hydroxide was used to neutralize the acid, what is the amount (in kg) of concentrated phosphoric acid that was spilled due to derailment?
H3PO4 + KOH ® K3PO4 + H2O

assuming that the sodium sulphate sample is 100% pure, calculate the volume of 0.25M BaCl2 required to precipitate all the sulphate in it.

Calculate the pH for the following solutions of weak acids and bases, make sure you know if you are dealing with an acid or a base.

0.051 M H2CO3 (Ka = 4.5 * 10-7) pH

Describe in brief the five mechanisms by which antibodies interact with antigens and
alter these.