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dybincka [34]
3 years ago
9

How many calories are released when 500 g of water cools from 95.0°C to 25.0°C?

Chemistry
1 answer:
Shtirlitz [24]3 years ago
6 0

Answer:

                  35,000 cal  will released.

Explanation:

By definition 1 kcal (=1000 calorie) is the approximate amount of energy released when the temperature of 1.000 kg of water is lowered by 1.000 °C (at a pressure of one atm.). It is about 4.2 kJ of energy.

                                   q = mC∆T

where q = heat (calories);      m = mass (500g);        C = specific heat (1 cal/g/deg);           ∆T = change in temp.                                                                                                    Thus,

              q = (500 g)(1 cal/g/deg)(95-25) = (500)(1)(70) = 35,000 cal

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Answer:  The precipitate formed is BaSO_4

Explanation:

A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid or precipitated form are represented by (s) after their chemical formulas.  

A double displacement reaction in which one of the product is formed as a solid is called as precipitation reaction.  

The balanced chemical equation is:

K_2SO_4(aq)+BaCl_2(aq)\rightarrow BaSO_4(s)+2KCl(aq)

3 0
3 years ago
Your lab partner accidentally spills some acid on his wrist and watchband. You should: (Check all that apply.)
nordsb [41]

Answer: Remove the watch and watchband immediately, and rinse his wrist for at least 15 minutes to be sure all hazardous material has been washed away. Let the TA inspect his wrist to see if it is okay.

Explanation:

The question is incomplete, the choices are:

a. Take him to the safety shower, and make sure he stands under it for at least 15 minutes to be sure all hazardous material has been washed away. b. Remove the watch and watchband immediately, and rinse his wrist for at least 15 minutes to be sure all hazardous material has been washed away. c. Let the TA inspect his wrist to see if it is okay.

d. Rinse the watch band before allowing him to put it back on.

An acid is traditionally considered to be any chemical compound that, when dissolved in water, produces a solution with greater hydronium cation activity than pure water, i.e., a pH less than 7. Both corrosive acids (and also corrosive bases) <u>are capable of destroying skin</u> by catalyzing the hydrolysis of fats, which are chemically esters. Also, when acids attack metals, hydrogen gas is often released.

This is why your lab partner should remove the watch and watchband immediately, and rinse his wrist for at least 15 minutes to be sure all hazardous material has been washed away. This ensures that the acid is can not damage the skin. And also the person should make sure that someone qualified checks it to see if it is okay.

7 0
3 years ago
Glucose and hexanoic acid each contain six carbon atoms, but they have completely different properties. Glucose is a nutrient fo
Bogdan [553]

Answer:

Functional groups.

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3 years ago
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kap26 [50]

Answer

B,C,D,E

Explanation:

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The hydrogen bonds are needed to be broken first when heat is applied to change from one state to another.It makes room for more heat to be applied than the required amount which signifies a higher latent heat of melting or vaporization and also a higher heat capacity .

5 0
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Question 6 (0.04 points)
Bingel [31]
I think it’s C
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