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STatiana [176]
2 years ago
8

Is fireworks exploding a chemical change?

Chemistry
2 answers:
anygoal [31]2 years ago
8 0

Answer:

The explosion of fireworks is an example of chemical change. During a chemical change, substances are changed into different substances. In other words, the composition of the substance changes.

zalisa [80]2 years ago
7 0

Answer:

Yes

Explanation:

The fireworks explode

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5.60 g of an unknown gas at STP fills a 500 mL flask. What is the molar mass of the gas
ale4655 [162]

Hey there!

From ideal gas equation we know,  PV = nRT

All the terms have their usual significance.

PV =w/M * RT

( where , n is number of moles = w/M,   we = weight of gas, M = molecular weight of the gas)

Therefore,  PV = wRT/M

At standard conditions ,  value of pressure, P = 1atm and standard temperature, T = 273K

And value of universal gas constant, R = 0.082 lit. atm. K⁻¹.mol⁻¹

Given that, weight of gas,

w = 5.60g and volume of gas,

V = 500mL = 0.5 Liters

Therefore, substituting all the value, we get   :

  Molar mass = 5.60 * 0.082 * 273 / 1 * 0.5

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3 years ago
Some of the physical properties used to distinguish between the three groups are: _________
Pavlova-9 [17]

The Group 3A metals have three valence electrons in their highest-energy orbitals (ns2p1). They have higher ionization energies than the Group 1A and 2A elements, and are ionized to form a 3+ charges. The Group 3A metals are silvery in appearance, and like all metals are good conductors of electricity.

7 0
3 years ago
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Annette [7]

Answer:

B. and A.

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Calculate how many moles of NH3 form when each quantity of reactant completely reacts according to the equation:
sergiy2304 [10]
The balanced chemical reaction is:

<span>3N2H4(l)→4NH3(g)+N2(g)
</span>
The amounts given for the N2H4 reactant will be the starting point for our calculations.

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What is a disadvantage of a series circuit?
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If one circuit fails, it is most likely that all the components in the circuit will fail.
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