Answer:
The oxygen gas
Explanation:
Oxidation occurs when one of the reactants loses electrons to become more positively charged. In the initial reaction 4Al is just aluminum metal, which has no charge. In the synthesis reaction, the oxygen causes the aluminum to lose electrons, oxidizing it, as it now has an Oxidation number of +3. Since the oxygen is what causes the Oxidation of aluminum, it is the oxidizing agent.
Answer:
160m/s
Explanation:
To find V Use the following formula V= F*W
V= Velocity F= Frequency W= Wavelength
V=20*8
=160m/s
<span>Answer:
pH = 2.7, therefore amount of H+ needed is 10^-2.7 M
u haf 80 ml of hcl and 90 ml of naoh left, therefore 20 ml of hcl used, and 10ml of naoh used.
mols of H+ = 0.02 x 7 x 10^-2 = 1.4 x 10^-3
mols of OH- = 0.01 x 5 x 10^-2 = 5 x 10^-4
H+ and OH- neutralise each other, so remaining mols of H+ = 9 x 10^-4
u need 10^-2.7 mols of H+, so 10^-2.7 - 9 x 10^-4 = 0.001095 mol
vol of HCL needed = 0.001095 / 7 x 10^-2 = 0.0156 L = 15.6 mL</span>