Density for Cu: 8.96
g/ml <span>
Density for Ag: 10.5g/ml</span>
First set up an
equation: mass = density * volume <span>
8.96 * x + 10.5* (10.12 - x) = 105.0
The density of the Cu (8.96) times x (the amount of copper)
added to the density of Ag (10.5) times voume of silver (10.12 - the amount of
copper) should equal the total weight.
</span>
Solving for x:<span>
x = 0.818 mL
So
mass of copper = 8.96 * .818 = 7.33
<span>mass percent of copper = 7.33/105 * 100% = 6.98%</span></span>
Answer:
Option A. 6.75 (6.20/85.6)
Explanation:
The following data were obtained from the question:
Initial volume (V1) = 6.2cm³
Initial concentration (C1) = 6.75M
Final volume (V2) = 85.6cm³
Final concentration (C2) =.?
The final concentration can be obtained by using the dilution formula as show below:
C1V1 = C2V2
6.75 x 6.2 = C2 x 85.6
Divide both side by 85.6
C2 = (6.75 x 6.2) /85.6
C2 = 6.75 (6.2 / 85.6).
Answer:
The correct option is: b. pH 6.4-8.0
Explanation:
Phenol red is a weak acid that is used as a pH indicator and exists in the form of stable red crystals.
<u>The color of the phenol red solution changes from yellow to red when the change in pH is observed. The color of phenol red transitions from yellow to red when the pH is 6.8 - 8.2 or 6.4 - 8.0</u>
Above the pH of 8.2, the phenol red solution turns a bright pink in color.
3x10^-4 cm = 0.0003 cm
3x10^4 km = 30,000 km.
Ultraviolet as ultraviolet light waves are around 420 nm like stated in the photo