Answer would be 21 electrons
Answer:
Explanation:
If an external vibration matches the drum's natural frequency, it will induce the can to vibrate. This is an example of resonance.
It is analogous to pumping your legs in synchronization with a swing's natural frequency.
The second one seems right
Answer:
Charge
Explanation:
A surplus (having "extra") or deficit (having "fewer") of electrons possessed by an object. A charge can cause attractive or repulsive forces which can be observed in some cases (e.g. pith balls, bits of plastic).
Answer:
1.78 M⁻²s⁻¹
Explanation:
Let's consider the following reaction:
A + B → C + D
The reaction order for A is 1 and the reaction order for B is 2.
The rate law is:
r = k.[A].[B]²
where,
r is the rate of the reaction
k is the rate constant
[A] and [B] are the molar concentrations of the reactants
Then, we can find the value of k.