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2 years ago

What ion is formed when an atom of mercury (Hg) loses two electrons

Physics

2 answers:

algol132 years ago

8 0

magnesium ion Hg2+ formed

Alja [10]2 years ago

8 0

Answer: $Hg^{2+}$ cation

Explanation:

Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom.

The electrons are filled according to Afbau's rule in order of increasing energies and thus the electronic configuration

$Hg:80:[Xe]4f^{14}5d^{10}6s^2$

Thus when it loses two electrons, the number of protons outweigh the number of electrons and thus a positively charged ion called as cation is formed:

$Hg^{2+}:[Xe]4f^{14}5d^{10}$

Thus $Hg^{2+}$ cation is formed when an atom of mercury (Hg) loses two electrons.

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In 1993, Ileana Salvador of Italy walked 3.0 km in under 12.0 min. Suppose that during 115 m of her walk Salvador is observed to

dexar [7]

Answer:

t = 25 seconds

Explanation:

Given that,

Distance, d = 115 m

Initial speed, u = 4.2 m/s

Final speed, v = 5 m/s

We need to find the time taken in increasing the speed.

We know that,

Acceleration, $a=\dfrac{v-u}{t}$ ....(1)

The third equation of kinematics is as follows :

$v^2-u^2=2ad\\\\\text{Put the value of a in above equation}\\\\v^2-u^2=2\times \dfrac{v-u}{t}\times d\\\\\because (a^2-b^2)=(a-b)(a+b)\\\\(v-u)(v+u)=\dfrac{2\times (v-u)d}{t}\\\\t=\dfrac{2d}{v+u}\\\\\text{Putting all the values}\\\\t=\dfrac{2\times 115}{4.2+5}\\\\t=25\ s$

Hence, it will take 25 seconds to increase the speed.

6 0

2 years ago

How many top quark lifetimes have there been in the history of the universe (i.e., what is the age of the universe divided by th

ololo11 [35]

Answer:

$1.0\cdot 10^{41}$ times

Explanation:

First of all, we need to write both the age of the universe and the lifetime of the top quark in scientific notation.

Age of the universe:

$T=100,000,000,000,000,000s = 1.0\cdot 10^{17} s$ (1 followed by 17 zeroes)

Lifetime of the top quark:

$\tau = 0.000000000000000000000001s = 1.0\cdot 10^{-24} s$ (we moved the decimal point 24 places to the right)

Therefore, to answer the question, we have to calculate the ratio between the age of the universe and the lifetime of the top quark:

$r = \frac{T}{\tau}=\frac{1.0\cdot 10^{17} s}{1.0\cdot 10^{-24} s}=1.0\cdot 10^{41}$

6 0

2 years ago

A ball rolls onto the path of your car as you drive down a quiet neighborhood street. To avoid hitting the child that runs to re

ehidna [41]

Answer:

F = 7.143 kN

Explanation:

given,

time taken to apply break = 1.05 s

car slows down from 15 m/s to 9 m/s

mass of the car = 1250 Kg

force is equal to the change in momentum with respect to time.

$F = \dfrac{\Delta P}{t}$

$F = \dfrac{m(v_f - v_i)}{t}$

$F = \dfrac{1250\times (9 - 15)}{1.05}$

$F = \dfrac{-7500}{1.05}$

F = -7142.85 N

F = - 7.143 kN

Force is acting opposite direction of velocity of car i.e. the sign is negative.

7 0

2 years ago

A student wishes to determine the heat capacity of a coffee-cup calorimeter. After she mixes 108.7 g of water at 60.2°C with 108

Oduvanchick [21]

Answer : The heat capacity of the calorimeter is, $6.72J/g^oC$

Explanation :

In this problem we assumed that heat given by the hot body is equal to the heat taken by the cold body.

$q_1=-q_2$

$m_1\times c_1\times (T_f-T_1)=-m_2\times c_2\times (T_f-T_2)$

where,

$c_1$ = specific heat of water = $4.184J/g^oC$

$c_2$ = specific heat of calorimeter = ?

$m_1$ = mass of water = 108.7 g

$m_2$ = mass of calorimeter = 108.7 g

$T_f$ = final temperature of mixture = $35.0^oC$

$T_1$ = initial temperature of water = $60.2^oC$

$T_2$ = initial temperature of calorimeter = $19.3^oC$

Now put all the given values in the above formula, we get

$(108.7g)\times (4.184J/g^oC)\times (35.0-60.2)^oC=-(108.7g)\times c_2\times (35.0-19.3)^oC$

$c_2=6.72J/g^oC$

Therefore, the heat capacity of the calorimeter is, $6.72J/g^oC$

3 0

2 years ago

A small box of mass m1 is sitting on a board of mass m2 and length L (Figure 1) . The board rests on a frictionless horizontal s

chubhunter [2.5K]

Explanation:

Whole system will accelerate under the action of applied force. The box will experience the force against the friction and when this force exceeds then the box will move. so

Ff = μs×m1×g

m1×a = μs×m1×g

a = μs×g

The applied force is given by

F = (m1 + m2)×a so

F = μs×g×(m1+m2)

3 0

2 years ago