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IrinaVladis [17]
4 years ago
12

In the coffee-cup calorimeter you used in the laboratory, which of the following statements is true? A.The water is part of the

system.(MA) B.The water is the system and the ice is the variable. C.The foam cups are not part of the system. D.The foam cups are the only part of the system.
Chemistry
1 answer:
Goryan [66]4 years ago
5 0
The "A)The water is part of the system" statement is true in the coffee-cup calorimeter used in the laboratory. The calorimeter is the device used for measuring the amount of the heat flow of a chemical reaction. The coffee-cup calorimeter is one of the most common types of calorimeter which has the water as a part of its system<span>.</span>
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a sample of sucrose that weighs 9.35 g is placed in a 15ml flask and the remaining volume of the flask is filled with benzene. t
Gre4nikov [31]

 The  density    of sucrose is 1.58  g/  cm³

 <em><u>Calculation</u></em>

Step 1 :  calculate  the  volume  of benzene

volume =  mass/density

mass  of benzene =  total mass - mass  of sucrose

  =17.33 g - 9.35 g =7.98 g

volume = 7.98 / 0.879 =9.08 cm³

Step  2: calculate the volume of sucrose

volume of sucrose=  Total volume  -  volume of benzene

Total  volume = 15 ml =15 cm³

volume  of sucrose is therefore =  15 cm³  - 9.08 cm³=5.92 cm³


Step 4: calculate the  density  of sucrose

density = mass/volume

= 9.35 g / 5.92 cm³ = 1.58 g/cm³


5 0
4 years ago
What’s the force of a pitching machine on a baseball?
worty [1.4K]

Answer:

The Machine exerts a force of 9N.

Explanation:

Initial velocity (u) = 0 m/s

Final velocity (v) = 30 m/s

Time (t) = 0.5 s

Acceleration (a) = (v-u)/t

= (30-0)/0.5 m/s²

= 30/0.5 m/s²

= 60 m/s²

Mass = 0.15 kg

Force = Mass*Acceleration

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7 0
2 years ago
Which element in the periodic table has the greatest electronegativity?
KengaRu [80]
F (Fluorine) has the highest electronegativity with a value of 4.0
7 0
3 years ago
Which of the following is an example of an exothermic reaction?
WINSTONCH [101]
D but I’m not to sure about it
4 0
3 years ago
PLEASE HELP QUICK
ludmilkaskok [199]

Answer:

Okay, I think I may actually have an answer for you. I would go with C, "The number of particles able to undergo a chemical reaction is less than the number that is not able to."

Explanation:

I just took a quiz with a similar question, and B is the only gas particle that is able to react. This cancels out all the other answers, as A and B are obviously incorrect based on that information, and it rules out D because T1 is the only sample with a particle able to react. I hope this helps!

8 0
3 years ago
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