Answer:
the possibility of contamination in the laboratory is minimized
Explanation:
When a particular laboratory equipment is used for a given purpose, it can not be used four another purpose until it has been thoroughly washed. This is done in order to avoid contamination when the equipment is subsequently used for a different purpose.
Hence, if a laboratory equipment is not properly cleaned and stored after use, they remain contaminated and give inaccurate results when subsequently used.
Answer:
Explanation:
4. Reduction reaction as Cu++ is reduced to Cu.
5. Double displacement reaction as the CO3-- replaces 2x OH-
6. Precipitation as two solutions combine to form a precipitate and a secondary product.
A large quantity if hydronium ions indicates an Arrhenius acid.
I think the answer is a. and d.
hope this helps!!
Answer:
Frequency = 6.67x10¹⁹ s⁻¹
Wavelength = 4.46x10⁻⁷m
e = 2.27x10⁻¹⁹J
Explanation:
To convert frequency to wavelength and vice versa we use the equation:
Wavelength = Speed of light / Frequency
<em>Speed ligth is 3x10⁸m/s</em>
<em />
For a wavelength of 4.50x10⁻¹²m:
4.50x10⁻¹²m = 3x10⁸m/s / Frequency
Frequency = 3x10⁸m/s / 4.5x10⁻¹²m
<h3>Frequency = 6.67x10¹⁹ s⁻¹</h3><h3 />
For a frequency of 6.73x10¹⁴s⁻¹:
Wavelength = 3x10⁸m/s / 6.73x10¹⁴s⁻¹
<h3>Wavelength = 4.46x10⁻⁷m</h3>
<em />
And energy, e, from frequency, is obtained as follows:
e = h ₓ frequency
<em>Where h is Planck's constant, </em>6.626x10⁻³⁴J*s
e = 6.626x10⁻³⁴J*s*3.43x10¹⁴s⁻¹
<h3>e = 2.27x10⁻¹⁹J</h3>