Answer:
fireworks is a chemical change
Explanation:
Because during a chemical change, substances are changed into different substances. In different terms, the composition of the substance changes.
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Answer:
Because mass is neither created nor destroyed, so the wax can not just disappear.
Explanation:
Answer:
it is the example of molecules
35.453 (chlorine) + 10.811 (boron) = 46.264
We can use the ideal gas law equation to find the volume of the gas.
PV = nRT
P - pressure - 400 kPa
V - volume
n - number of moles - 4.00 mol
R - universal gas constant - 8.314 Jmol⁻¹K⁻¹
T - temperature - 300.0 K
substituting these values in the equation
400 000 Pa x V = 4.00 mol x 8.314 Jmol⁻¹K⁻¹ x 300.0 K
V = 24.9 dm³
Volume is 24.9 dm³
