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sleet_krkn [62]
3 years ago
5

What is flame over circle mean?

Chemistry
2 answers:
Tom [10]3 years ago
7 0
Flame over Circle. This symbol on a chemical label means that the substance is an oxidizer. Oxidizers may cause a fire by increasing the concentration of oxygen in the air.
Dominik [7]3 years ago
5 0
That means flammable
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Four hundred kg/h of Steam from a low pressure turbine at 12.5 atm. and 250 C goes into a feed water heater which preheats the w
Nitella [24]

Explanation:

According to the heat relationship,

    Heat given by steam = heat taken by water

Hence,    (mC_{p} \Delta T)_{steam} = (mC_{p} \Delta T)_{water}

where, C_{p} = specific heat

Value of C_{p}_{steam} at 250^{o}C and 12.5 atm is 2.326 kJ/Kg^{o}C.

And, C_{p}_{steam} at 200^{o}C and 12.5 atm is 2.743 kJ/Kg^{o}C.

Therefore, average C_{p}_{steam} = \frac{2.326 kJ/Kg^{o}C + 2.743 kJ/Kg^{o}C}{2}

                                          = 2.5345 kJ/Kg^{o}C

As the given data is as follows.

      m_{steam} = 400 kg/hr, \Delta T_{steam} = 250^{o}C - 200^{o}C = 50^{o}C, m_{water} = 500 kg/hr

            C_{p}_{water} = 4.186 kJ/kg^{o}C

Hence, putting the given values into the above formula as follows.

           (mC_{p} \Delta T)_{steam} = (mC_{p} \Delta T)_{water}

  (400 \times 2.5345 kJ/kg^{o}C \times 50^{o}C)_{steam} = (500 kg \times 4.186 kJ/kg^{o}C \Delta T)_{water}

                \Delta T_{water} = 24.2^{o}C

As we know that, \Delta T_{water} = T_{2} - T_{1}

                             T_{2} - 20^{o}C = 24.2^{o}C

                            T_{2} = 44.2^{o}C

Thus, we can conclude that the new temperature of water is 44.2^{o}C.

3 0
4 years ago
What are the chemical properties of chromium
tatyana61 [14]
<span>Symbol- Cr
Oxidation States: 6, 3, 2, 0

Chromium is unstable in oxygen, it immediately produces a thin oxide layer that is impermeable to oxygen and protects the metal below. </span>
6 0
4 years ago
Os etapas que devem sem compridas para obter separadamente os componentes (a as substâncias ) de uma mistura de água ,sal e arei
SashulF [63]

Answer:

The steps that must be long to obtain separately the components (to the substances) of a mixture of water, salt and sand, are respectively: A) filtration and siphoning B) decanting and siphoning C) simple filtration and distillation D) collection and decantation.

Simple filtration and Siphoning is the method. When an insoluble solid is present in a liquid. Filtration is the ideal method of separation,The sand is filtered by the filtered paper as water is allowed to pass through the filter paper into a beaker where the funnel which hold the filter paper emptied into.

Water molecules is Siphoned, pull by force of gravity through the sand, past  the filter paper to emerge as clean in the beaker below.

4 0
4 years ago
Which of the following is the definition of motion?
Irina-Kira [14]

Answer:

A.

Explanation:

A change of position over time.

B is a vector and C is a distance.

6 0
3 years ago
WILL GIVE BRAINLIEST TO ANSWER
aleksklad [387]

Answer:

2.5 grams

Explanation:

you can see it on the graph

4 0
3 years ago
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