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Bad White [126]
3 years ago
9

Conservation of mass question..

Chemistry
2 answers:
aksik [14]3 years ago
5 0

Answer:

the mass on each side of the equation is the same.

Explanation:

The law of conservation of mass focuses on how the mass of a compound is the same after it has been transformed however the problem states. answer choice 'c' is the definition of the law of conservation of mass.

Nadya [2.5K]3 years ago
4 0

Answer:

C

Explanation:

Conservation of mass states that mass cannot be created or destroyed.  So both sides of the equation will have the same mass.

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Will medal!!!
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Δ H reaction = q / n where q: amount of heat released and n is number of moles of substance.
q = m . C . ΔT where:
m = mass of substance (g)
C = Specific heat capacity (4.18)
ΔT = change in temperature = 24.25 - 23.16 = 1.09
q = 1000 x 4.18 x 1.09 = 4556 J = 4.556 kJ
number of moles (n) = Molarity (M) x Volume (L)
                                 = 0.185 M x 0.07 L = 0.01295 mole
Δ H = q / n = - (4.556 kJ / 0.01295 mole) = -351.8 kJ / mol
Note: it is exothermic reaction (-ve sign)  i.e. temperature is raised

5 0
4 years ago
How do balanced chemical equations show the conservation of mass?
stepladder [879]

You cannot create something from nothing and similarly you cannot create less from more, if you didn't balance an equation that needs to be balanced, your product might end up equalling more or less than the total mass of the two elements combined. Which is impossible

3 0
4 years ago
1. Which of the following does NOT indicate that a chemical change may have taken place?
mihalych1998 [28]
<span>1. Which of the following does NOT indicate that a chemical change may have taken place?
A. fracture formation
B. gas production
C. precipitate formation 
D. energy transfer
it is (a.)</span>
5 0
4 years ago
Calculate the root mean square (rms) average speed of the atoms in a sample of xenon gas at 0.15 atm and -55c
GrogVix [38]
Answer:
Vrms is 149.7266 m/sec

Explanation:
The root means square velocity of a gas can be calculated as follows:
Vrms = \sqrt{ \frac{3RT}{M}}
where:
R is the ideal gas constant = 8.3145
T is absolute temperature = -55 + 273 = 118 degrees kelvin
M is the molar mass of the gas = 131.293 grams = 0.131293 kg

Substituting with these givens in the above equation, we would find that the Vrms is 149.7266 m/sec

Hope this helps :)
7 0
4 years ago
How does density change by changing the mass without changing the volume and by changing the volume of a substance without chang
Alchen [17]
Because density=mass/volume, the density of a substance would increase if the mass was increased and the volume was not, and decreased if the volume was increased and the mass was not. 
5 0
3 years ago
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