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Agata [3.3K]
1 year ago
13

You and your lab group have been asked to design an investigation to determine the effects of heat transfer between two differen

t objects.
Which of the following investigation designs explains the heat transfer when atoms directly touch?
А
Boiling water, in a pan, sitting on a lit Bunsen burner.
B
Boiling water, in a pan, in front of a lit Bunsen burner.
С
Hands warming in front of a lit Bunsen burner.
D
Hands touching the handle of pan sitting on a lit Bunsen burner.
Chemistry
1 answer:
GREYUIT [131]1 year ago
5 0
I believe that answer is D
The heat from the Bunsen burner transfers to the water and the pot, then the heat from the pot transfers to the person’s hand.
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A teacher wants to figure out The amount of a solution that is needed for a titration experiment in a class lab! the class has 1
AnnZ [28]
The teacher needs 1500 mL for the whole class.
5 0
1 year ago
Read 2 more answers
An unknown solid is entirely soluble in water. On addition of dilute HCl, a precipitate forms. After the precipitate is filtered
Karo-lina-s [1.5K]

Answer:

Pb(NO3)2

Cd(NO3)2

Na2SO4

Explanation:

In the first part, addition of HCl leads to the formation of PbCl2 which is poorly soluble in water. This is the first precipitate that is filtered off.

When the pH is adjusted to 1 and H2S is bubbled in, CdS is formed. This is the second precipitate that is filtered off.

After this precipitate has been filtered off and the pH is adjusted to 8, addition of H2S and (NH4)2HPO4 does not lead to the formation of any other precipitate.

The yellow flame colour indicates the presence of Na^+ which must come from the presence of Na2SO4.

5 0
1 year ago
Which of the following is not the same as 0.032 liters?
sineoko [7]
This question needs the answer choices.

I found these choices for you:
<span>0.00032hL
320cL
32mL

Then  you need to make the conversion of 0.032 liters to hectoliters, centiliters and milimilters to check which is not equivalent.

1) 0.032 liters to hectoliters:

    0.032 liter *  1 hectoliter / 100 liter = 0.00032 hecoliter

2) 0.032 liter to centiliters:

    0.032 liter * 100 centiliters / 1 liter = 3.2 centiliter

3) 0.032 liter to mililiter:

    0.032 liter * 1000 mililiter / liter = 32 mililiter

Then, the answer is 320 cL: 320 cL is not the same as 0.032 liters

</span>
3 0
2 years ago
What is the origin of first (mass of 157.836 amu) peak (of what isotopes does each consist)? express your answers as isotopes se
Klio2033 [76]

Answer and explanation;

-Bromine molecule (Br2) consists of two bromine atoms (Br-Br). These two atoms may be originated from the same type of isotopes Br2(11) and Br2(22) or from two types of isotopes, Br2(12).

The intensity of the peak depends on the abundance of the isotope. The larger the intensity of the peak, the greater the abundance of the isotope. For Br, the relative size of the peak for Br 2 molecule consisting of two different isotopes will be larger than the Br molecule consisting of same isotopes, i.e relative size of the peak for Br molecules consisting of different isotopes is twice as that of Br molecule consisting of same isotopes.

-Hence, from the data in the table we could say that the peak of mass 157.836 represents 79Br - Br peak, 159.834 represents Br - Br peak and peak of mass 161.832 represents Br - 81 81 Br

-The first peak will represent the lighter Br2 molecule, the third peak will represent the heavier Br2 molecules and the middle peak will represent the intermediate Br2 molecule which is Br2(12) .


3 0
1 year ago
The vapor pressure of pure water at 85oC is 434 torr. What is the vapor pressure at 85oC of a solution prepared from 100 mL of w
Alexandra [31]

Answer:

P=361.2torr

Explanation:

Hello,

In this case, considering that the formed liquid is solution is ideal, we can relate the vapor pressure and molar fraction of water with the total vapor pressure of the solution by using the Dalton's equilibrium-based law:

P=x_{H_2O}P_{H_2O}^v

In such a way, we compute the molar fraction of water by computing its moles as well as diglyme:

n_{H_2O}=100mL*\frac{1g}{1mL} *\frac{1mol}{18g} =5.56molH_2O\\\\n_{C_6H_{14}O_3}=150g*\frac{1mol}{134g}=1.12molC_6H_{14}O_3

Thus, the mole fraction of water:

x_{H_2O}=\frac{5.56mol}{5.56mol+1.12mol}=0.832

Thereby, the vapor pressure of the solution:

P=0.832*434torr\\\\P=361.2torr

Regards.

7 0
2 years ago
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