If the precipitate of CaSO4 was weighed before all of the
water has evaporated, therefore this will lead to a miscalculation on the
number of moles of CaSO4. During the calculation, the mass of the water will be
included hence there will be higher number of moles than what is correct.
Answer:
6.791
Explanation:
For proper significant figures with addition, you would use the significant figures of the number with lowest decimal place. 6.298 goes to the 10⁻³ place. 0.492712 goes to the 10⁻⁶ place. You will go out to the 10⁻³ place.
6.298 + 0.492712 = 6.790712 ≈ 6.791
Agree with the statement like most of human achievements chemistry has been used as well as misused.
Science help in development of culture and promoting human civilization but human misused this achievements in their self interest. Like innovation of nuclear power system helps in increasing nation's development but at the same time man is misusing this atomic energy for making powerful bomb.
Explanation:
Human achieved their success in various field with the help of science and technology. Every aspects of things has two side. Its depend upon us which one we will take off. Specifically chemistry the hard core science contributes a lot in upgrading civilization like innovation of nuclear power system which can reduce the use of other conventional energy resources which is much needed for our future generation.
But our so called society and civilization use this technological and scientific achievements in a negative way and produce nuclear bomb to fulfill their self interest.
Answer:
1. The dye that absorbs at 530 nm.
Explanation:
The dye will absorb light to promote the transition of an electron from the HOMO to the LUMO orbital.
The higher the gap, the higher the energy of transition. The energy can be calculated by E = hc/λ, in which h and c are constants and λ is the wavelength.
The equation shows that the higher the energy, the higher the gap and the lower the wavelength.
Therefore, the dye with absorption at 530 nm has the higher HOMO-LUMO gap.
Answer:
The molecular geometry of SO3 is trigonal planar.
Explanation:
Look at the Lewis