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Chemistry
As a solid goes through a phase change to a liquid, heat is absorbed and the temperature
increases
decreases
remains the same
fluctuates.
increases
decreases
remains the same
fluctuates.
Chemistry
A large and a small container of water with the same temperature have
the same total amounts of internal energy.
the same amounts of internal and external energy.
different amounts of heat.
the same amounts of all forms of energy.
the same total amounts of internal energy.
the same amounts of internal and external energy.
different amounts of heat.
the same amounts of all forms of energy.
Chemistry
With all other factors equal, the most likely to burn your mouth when taken directly from an oven is a food with
higher specific heat.
lower specific heat.
specific heat is not important in this situation.
more information needed.
higher specific heat.
lower specific heat.
specific heat is not important in this situation.
more information needed.
Chemistry
Substance A has a higher specific heat than substance B. With all other factors equal, which requires the most energy to heat equal masses of A and B to the same temperature?
Substance A
Substance B
Both require the same amount of heat.
Answer depends on the density of each substance.
Substance A
Substance B
Both require the same amount of heat.
Answer depends on the density of each substance.
Chemistry
One of the following is not a proper way of preparing 0.025M solution from 1.00M stock solution.
2.5 mL of stock solution is diluted to 100mL
25 mL of stock solution is made up to 1000mL
12.5 mL of the stock solution is made up to 500mL
12.5 mL of the stock solution is made up to 750mL
2.5 mL of stock solution is diluted to 100mL
25 mL of stock solution is made up to 1000mL
12.5 mL of the stock solution is made up to 500mL
12.5 mL of the stock solution is made up to 750mL
Chemistry
3.47g sodium carbonate was dissolved in a 250millilitre standard flask. What is the concentration of the resulting solution
0.13M
0.52M
0.66M
0.40M
0.13M
0.52M
0.66M
0.40M
Chemistry
Heating sodium bicarbonate before its use as a standard expels
Carbon dioxide only
Water and carbon dioxide
Water only
Impurities
Carbon dioxide only
Water and carbon dioxide
Water only
Impurities
Chemistry
On heating a substance prior to weighing, it is placed --------------.
On the laboratory desk
In water
In a fume hood
In a dessicator
On the laboratory desk
In water
In a fume hood
In a dessicator
Chemistry
A pure substance could be described as -----------.
A white crystalline sample
A sample with little impurities
A sample which maintains its physical appearance with time
A sample which does not change its chemical composition during storage
A white crystalline sample
A sample with little impurities
A sample which maintains its physical appearance with time
A sample which does not change its chemical composition during storage
Chemistry
When a substance is not available in a pure form, its solution can be standardized by ---------------.
Re- crystallizing the substance and diluting it
Titrating againt a substance of unknown concntration
Titrating against a substance of known concentration
Preparing a new solution of the substance
Re- crystallizing the substance and diluting it
Titrating againt a substance of unknown concntration
Titrating against a substance of known concentration
Preparing a new solution of the substance
