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WorksheetsChemistry Regent - June 2015 Q41-50
Total questions: 10
Worksheet time: 5mins
Name
Class
Date
1.
Which elements can react to produce a molecular compound?
a)
calcium and chlorine
b)
hydrogen and sulfur
c)
lithium and fluorine
d)
magnesium and oxygen
2.
Compared to a 1.0-mole sample of NaCl(s), a 1.0-mole sample of NaCl(ℓ) has a different
a)
number of ions
b)
empirical formula
c)
gram-formula mass
d)
electrical conductivity
3.
Which property of an unsaturated solution of sodium chloride in water remains the same when more water is added to the solution?
a)
density of the solution
b)
boiling point of the solution
c)
mass of sodium chloride in the solution
d)
percent by mass of water in the solution
4.
Which ion combines with Ba2 to form a compound that is most soluble in water?
a)
S2-
b)
OH-
c)
CO32-
d)
SO42-
5.
When a sample of gas is cooled in a sealed, rigid container, the pressure the gas exerts on the walls of the container will decrease because the gas particles hit the walls of the container
a)
less often and with less force
b)
less often and with more force
c)
more often and with less force
d)
more often and with more force
6.
A rigid cylinder with a movable piston contains 50.0 liters of a gas at 30.0°C with a pressure of 1.00 atmosphere. What is the volume of the gas in the cylinder at STP? (1) (3) (2) (4)
a)
5.49 L
b)
45.0 L
c)
55.5 L
d)
455 L
7.
Given the potential energy diagram for a chemical reaction, which numbered interval represents the heat of reaction?
a)
1
b)
2
c)
3
d)
4
8.
What is represented by the number “1” in the IUPAC name for three of these alcohols?
a)
the number of isomers for each alcohol
b)
) the number of -OH groups for each carbon atom in each alcohol molecule
c)
the location of an -OH group on one end of the carbon chain in each alcohol molecule
d)
the location of an -OH group in the middle of the carbon chain in each alcohol molecule
9.
What can be concluded from this graph?
a)
At 101.3 kPa, water has a higher boiling point than 1-butanol.
b)
At 101.3 kPa, water has a lower boiling point than ethanol.
c)
The greater the number of carbon atoms per alcohol molecule, the lower the boiling point of the alcohol.
d)
The greater the number of carbon atoms per alcohol molecule, the higher the boiling point of the alcohol.
10.
In the laboratory, a student investigates the effect of concentration on the reaction between HCl(aq) and Mg(s), changing only the concentration of HCl(aq). Data for two trials in the investigation are shown in the table. Compared to trial 1, what is the expected reaction time for trial 2 and the explanation for that result?
a)
less than 48 s, because there are fewer effective particle collisions per second
b)
less than 48 s, because there are more effective particle collisions per second
c)
more than 48 s, because there are fewer effective particle collisions per second
d)
more than 48 s, because there are more effective particle collisions per second
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