Answer: A. 11.15
Explanation:
The pH of a solution is given by the formular; pH = -log [H+].
pH = - log [ 7.0 x 10 ∧-12]
= 12 - log 7
= 12 - 0.845
= 11.15
<u>Answer:</u> The number of electrons in given amount of silver are
<u>Explanation:</u>
The number of moles is defined as the ratio of the mass of a substance to its molar mass.
The equation used is:
......(1)
We are given:
Mass of silver = 7.0 g
Molar mass of silver = 107.87 g/mol
Putting values in equation 1:
According to the mole concept:
1 mole of a compound contains number of particles.
Number of electrons per atom of silver = 47
So, 0.065 moles of silver will contain = number of electrons
Hence, the number of electrons in given amount of silver are
Answer:
The dog weighs 29,88 lbf at the top of the Everest
Explanation:
The difference between mass and weight is that <em>mass is the amount of matter in a material</em>, while <em>weight is a measure of how the force of gravity acts upon that mass.</em>
So mass remains constant always, while weight depends on gravity. At the same time, on Earth, gravity varies slightly depending on the distance to the center of Earth. At the top of Mountain Everest, gravity has a value of 32,042 ft/s2 (normally we use 32, 174 ft/s3 as the average gravity value of Earth) so the weight of the dog will be:
W=m*g.............
<em>Note that normally 1 lbm </em><u><em>has a weight</em></u><em> of 1 lbf because 1 lbf = 32,174 lbmft/s^2 (the average value of gravity in Earth)</em>
Answer:
Chemicals
Explanation:
Chemistry is the study if chemicals and chemical reactions, atoms, etc
Gold isn't very reactive (it's low on the reactivity table).
It doesn't react with oxygen or halogens with any ease, nor does it tend to dissolve in acid.