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dolphi86 [110]
3 years ago
12

Element X consist of two isotopes with masses of 62.9 and 64.9. The relative atomic mass of the element is 63.6. What is th

Chemistry
1 answer:
koban [17]3 years ago
4 0

Answer:

it is 50%

Explanation:

62.9x50=3145

64.9x50=3245

3245+3145=6390

6390/100=63.9

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A glass of ice at 0 degrees celsius changes to a glass of water at 0 degrees celsius. What caused the ice to change to water ?
n200080 [17]
Evaporation caused the ice to change to water
7 0
3 years ago
An atom of oxygen has six valence electrons. In nature, oxygen is a diatomic molecule and is usually found in the form O2. Why w
zheka24 [161]

Answer:

In order to attain stability

Explanation:

Every chemical bonds that are formed results from the desires of atoms to achieve stability like the inert and nonreactive noble gases. By so doing, their outer shell electrons must be completely filled to attain an octet configuration like the noble gases with eight outermost electrons.

An atom of oxygen has six outer electrons. To complete its octet, it will require just two more electrons.  

This desire will make it bond with another atom. In the vicinity of another oxygen atom, it will bond. The type of bond formed will be a covalent bond which results from each of the oxygen atom sharing two of their valence electrons.

The joint shared electrons will now be four electrons. This four electrons will make each of their octet complete and a covalent bond occurs.

3 0
3 years ago
What is the coefficient of 2H2SO4
VladimirAG [237]
The coefficient is the number in front of the element.
The coefficient is 2
Hope this helps!
7 0
3 years ago
Match each element to the number of electrons in its valence shell.
irinina [24]

Answer:

C: 4

H: 1

Mg: 2

O : 6

Explanation:

You can quickly find out the number of valence electrons by looking at where the element is on the periodic table and referring to the table that is attached.

6 0
1 year ago
Which statements correctly describe the decay rates of radioactive isotopes?
storchak [24]

Answer: b} The exact time when an individual atom will decay can be accurately predicted.

c} After each half-life, the amount of radioactive material is reduced by half.

Explanation:

All radioactive decay  follows first order kinetics.

Rate law expression for first order kinetics is given by:

t=\frac{2.303}{k}\log\frac{a}{a-x}

where,

k = rate constant

t = time taken for decay process

a = initial amount of the reactant

a - x = amount left after decay process

Expression for calculating half life, which is the time taken by the half of the reactants to decompose is:

t_{1/2}=\frac{0.693}{k}


4 0
3 years ago
Read 2 more answers
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