Chemistry is the study of the substances that make up matter. It looks at their properties, how they react with each other, and how these reactions can create new substances.
-
Question 231: An example of an alcohol is
Options:
A) CCl4
B) CH3COOH
C) CHCl3
D) C2H6
E) CH3OH
Show Answer
The correct answer is E .
-
Question 232:
In the reaction:
2Hl(g) ↔ H2(g) + l2(g)' ΔH = 10 kj;
The concentration of iodine in the equilibrium mixture can be increased by?
Options:
A) raising the pressure
B) raising the temperature
C) adding a catalyst
D) lowering the pressure
Show Answer
The correct answer is B .
-
Question 233: When salt loses its water of crystallization to the atmosphere on exposure, the process is said to be
Options:
A) efflorescence
B) déliquescence
C) effervescence
D) fluorescence
Show Answer
The correct answer is A .
-
Question 234: The cracking process is very important in the petroleum industry because it.
Options:
A) gives purer products
B) yields more lubricants
C) yields more engine fuels
D) yields more asphalt
E) yields more candle wax
Show Answer
The correct answer is C .
-
Question 235: Which of the following is a physical change?
Options:
A) Freezing ice cream
B) dissolving calcium in water
C) burning kerosene
D) Exposing white phosphorus to air
Show Answer
The correct answer is A .
-
Question 236: An increase in temperature causes an increase in the pressure of a gas because there is an increase in the?
Options:
A) average velocity of the molecules
B) number of collisions between the molecules
C) density of the molecules
D) free mean path between each molecules and other
Show Answer
The correct answer is B .
-
Question 237: The relative atomic mass of a naturally occurring lithium consisting of 90%Li and 10%Li is
Options:
A) 6.2
B) 6.8
C) 7.1
D) 6.9
Show Answer
The correct answer is D .
-
Question 238: The reaction Mg + H2O → MgO + H2 takes place only in the presence of?
Options:
A) excess Mg ribbon
B) excess cold water
C) very hot water
D) steam
Show Answer
The correct answer is D .
-
Question 239: A cracking process in petroleum refining can be represented by
Options:
A) heptane to heptene
B) heptane to 3-methylhexane
C) heptane to propene and butane
D) heptane to 2,3,3-trimethybutane
Show Answer
The correct answer is C .
-
Question 240:
At 2.0 atm pressure, the volume of a gas is 4.0 L. If the pressure is reduced to 1.0 atm while keeping the temperature constant, what will be the new volume of the gas?
Options:
A) 2.0 L
B) 6.0 L
C) 8.0 L
D) 4.0 L
Show Answer
The correct answer is C .