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Stella [2.4K]
4 years ago
7

3. Burns from boiling water can be severe, caused by the transfer of energy from the boiling water to the

Chemistry
1 answer:
Free_Kalibri [48]4 years ago
8 0

Answer:

Q = 3937.56  J

Explanation:

Heat transferred due to change in temperature is given by :

Q=mc\Delta T

c is the specific heat of water, c=4.18 J/g-°C

We have, m = 15 g, T_i=100^{\circ} C\ \text{and}\ T_f=37.2^{\circ} C

So,

Q=15\times 4.18\times (37.2-100)\\Q=-3937.56\ J

Hence, 3937.56  J of heat is transferred.

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What is the main precaution to take if a gas cylinder sign is present in the lab? select one
Step2247 [10]

The main precautions to take if a gas cylinder sign is present in the lab visually check that the gas cylinder is restrained, but keep a safe distance from it. The correct option is c.

<h3>What are the precautions?</h3>

Precautions are the preventive steps that are taken to save yourself from any dangerous circumstances. These steps are always taken in doing experiments and other scientific procedures.

 

Here, the precautions are to check the gas cylinder.

Thus, the correct option is c, Visually check that the gas cylinder is restrained, but keep a safe distance from it.

To learn more about precautions, refer to the link:

brainly.com/question/15622844

#SPJ4

The question is incomplete. Your most probably complete question is given below:

Remove the strap from around the gas cylinder to use it in the lab.

Open the valve on the gas cylinder periodically to release pressure.

Visually check that the gas cylinder is restrained, but keep a safe distance from it.

Test out the regulator on the gas cylinder to make sure it is working properly.

4 0
2 years ago
Why does oxygen have a higher electronegativity compared to chlorine?
bezimeni [28]

Answer:

The  electronegativity   of fluorine  compare  to the  electronegativity   of oxygen and chlorine as below

Explanation:

Fluorine  has the highest electronegativity than oxygen, and  chlorine.

 Explanation

Generally  the  electronegativity  increase   across the period ( from the left to the right)  and  decreases down  the group.

Both oxygen and fluorine  are in period 2   in  periodic   table. since  fluorine is on  fur  right side as compared to oxygen , fluorine has higher  electronegativity than  oxygen.

On the  other side  Fluorine  and  chlorine are  in the same group in periodic table. fluorine  is at  the top of  the group  while chlorine  is at  the bottom therefore fluorine has  higher electronegativity  than chlorine.

6 0
3 years ago
Hello
nordsb [41]

Answer:

The ratio of the number of atoms of gold and silver in the ornament is 197 : 1080.

Explanation:

Let the mass of silver ornament be x.

Mass of gold polished on an ornament = 1% of x= 0.1 x

Moles of silver =\frac{x}{108 g/mol}

Number of atoms = Moles\times N_A

Where : N_A = Avogadro number

Moles of gold =\frac{0.1x}{197 g/mol}

Silver atoms =\frac{x}{108 g/mol}\times N_A

Gold atoms =\frac{0.1x}{197 g/mol}\times N_A

The ratio of the number of atoms of gold and silver in the ornament:

=\frac{\frac{0.1x}{197 g/mol}\times N_A}{\frac{x}{108 g/mol}\times N_A}

= 197 : 1080

3 0
3 years ago
What would happen if an alkali metal was combined with a halogen?
Komok [63]
Ionic bond would form
e. g. NaCL
8 0
4 years ago
What is the definition of Indirect Proportion Graph?
charle [14.2K]

Answer:

Explanation:

The graph of an inversely proportional relationship displays a vertical asymptote at the y-axis as the y value increases without bound as x gets closer and closer to zero (but is positive) and decreases without bound as x gets closer and closer to zero (but is negative)and a horizontal asymptote at the x-axis as y gets .

4 0
4 years ago
Read 2 more answers
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