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timofeeve [1]
3 years ago
8

What types of salts are added to fireworks to give them color

Chemistry
1 answer:
Evgesh-ka [11]3 years ago
5 0
Metal salts.
Strontium Carbonate = red
Calcium Chloride = orange
Sodium Nitrate = yellow
Barium Chloride = green
Copper Chloride = blue
Strontium/Copper = purple
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4. What is the volume of a box that has a length of 50cm, a width of 20cm,<br> and a height of 5 cm?
EastWind [94]

5,000 cm3 (cubic centimeters)

4 0
2 years ago
1 mol super cooled liquid water transformed to solid ice at -10 oC under 1 atm pressure.
Arada [10]

Answer:

Explanation:

Given that:

number of moles of super cooled liquid water = 1

Melting enthalpy of ice = 6020 J/mol

Freezing point =0 °C = (0 + 273 K)= 273 K

The decrease in entropy of the system during freezing for 1 mol (i.e during transformation from liquid water to solid ice )  = - 6020 J/mol × 1 mol /273 K = -22.051 J/K

Entropy change during further cooling from 0 °C (273 K) to -10 °C (263 K)

\Delta \ S = \int\limits^{T_2}_{T_1}\dfrac{nC_p(s)dT}{T}

\Delta \ S = {nC_p(s)In \dfrac{T_2}{T_1}

\Delta \ S = {(1*37.7)In \dfrac{263}{273}

Δ S = -1.4 J/K

Total entropy change of the system = - 22.05 J/K - 1.4 J/K = - 23.45 J/K

Entropy change of universe = entropy change of the system+ entropy change of the surrounding

According to the second law of thermodynamics

Entropy change of universe  >0

SO,

Entropy change of the system + entropy change in the surrounding > 0

Entropy change in the surrounding > - entropy change of the system

Entropy change in the surrounding > - (- 23.53 J/K)

Entropy change in the surrounding > 23.53 J/K

b) Make some comments on entropy changes from the obtained data.

From the data obtained; we will realize that the entropy of the system decreases as cooling takes place when water is be convert to ice , randomness of these molecules reduces and as cooling proceeds , hence, entropy reduces more as well and the liberated heat will go into the surrounding due to this entropy of the surrounding increasing.

4 0
2 years ago
Which of the following is characterized by existing at a discrete energy level?
hichkok12 [17]
Energy levels are considered orbitals.
5 0
3 years ago
Read 2 more answers
Why are there 2 chloride ions for every 1 calcium in calcium chloride
tensa zangetsu [6.8K]

Answer:

See explanation

Explanation:

Calcium is divalent. This means that it donates two electrons during ionic bond formation. Since chlorine atom can only accept one electron during ionic bond formation, two chlorine atoms must accept the two electrons donated by calcium.

For this purpose, each time CaCl2 is formed, there must be two chlorine atoms for each calcium atom.

5 0
3 years ago
Student have a receipt which calls for 1.15 lb of flour, but, of course, in France you will need to purchase flour in kilograms.
Verizon [17]

0.52164 kg of Flour

<u>Explanation:</u>

We have to convert lb (pounds) kg (kilograms), by using the conversion unit,

1 lb = 0.4536 kg

So to convert 1.15 lb into kg, we have to multiply 1.15 by 0.4536.

1.15 \times 0.4536 = 0.52164 kg of Flour

So the receipt calls for 0.52164 kg of Flour.

5 0
3 years ago
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