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3 years ago

_ are elements of the same element that have a different _ due to a different number of _______.

Chemistry

1 answer:

Andreas93 [3]3 years ago

4 0

Answer: Isotopes

Explanation:

The atoms of a chemical element can exist in different types. These are called isotopes. They have the same number of protons (and electrons), but different numbers of neutrons. Different isotopes of the same element have different masses.

Hope this helps!

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If the half-life of an element is 150 years, how much of a 400 gram sample would remain in 750 years?

photoshop1234 [79]

Answer:

Explanation:

5 0

2 years ago

"46.7 g of water at 80.6 oC is added to a calorimeter that contains 45.33 g of water at 40.6 oC. If the final temperature of the

soldier1979 [14.2K]

Answer: The specific heat of calorimeter is 30.68 J/g°C

Explanation:

When hot water is added to the calorimeter, the amount of heat released by the hot water will be equal to the amount of heat absorbed by cold water and calorimeter.

$Heat_{\text{absorbed}}=Heat_{\text{released}}$

The equation used to calculate heat released or absorbed follows:

$Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})$

$m_1\times c_1\times (T_{final}-T_1)=-[(m_2\times c_2)+c_3](T_{final}-T_2)$ ......(1)

where,

q = heat absorbed or released

$m_1$ = mass of hot water = 46.7 g

$m_2$ = mass of cold water = 45.33 g

$T_{final}$ = final temperature = 59.4°C

$T_1$ = initial temperature of hot water = 80.6°C

$T_2$ = initial temperature of cold water = 40.6°C

$c_1$ = specific heat of hot water = 4.184 J/g°C

$c_2$ = specific heat of cold water = 4.184 J/g°C

$c_3$ = specific heat of calorimeter = ? J/g°C

Putting values in equation 1, we get:

$46.7\times 4.184\times (59.4-80.6)=-[(45.33\times 4.184)+c_3](59.4-40.6)$

$c_3=30.68J/g^oC$

Hence, the specific heat of calorimeter is 30.68 J/g°C

6 0

3 years ago

Explain the changes in potential energy as a chemical bond forms

weqwewe [10]

Energy is released when a chemical bond forms

7 0

2 years ago

Complete the table below by filling in the principal quantum number n and angular momentum quantum number l for each electron su

Alja [10]

Answer:

For 4f the principal quantum number, n is 4 and the angular momentum quantum number l is 3

7s: n = 7 and l = 0

4p: n = 4 and l = 1

7p: n = 7 and l = 1

Explanation:

The principal quantum number gives the energy level of the electron in an atom. It shows the shells in which an electron is in an atom.

if n = 1, 2, 3, 4...; it corresponds to K, L, M, N... shells in an atom

The numerical coefficient of the subshell gives the pricipal quantum number.

for instance in 4f, the principal quantum number, n is 4 because 4 is the coefficient.

The angular momentum quantum number, l gives the energy sublevel or subshell.

Angular momentum quantum number has integral values, l = 0, 1, 2, 3... which correspond to s, p, d, f,.. orbitals.

Thus for 4f the principal quantum number, n is 4 and the angular momentum quantum number l is 3

similarly, for 7s: n = 7 and l = 0

4p: n = 4 and l = 1

7p: n = 7 and l = 0

using similar approach for others

3 0

2 years ago

The reaction of an alcohol with an organic acid produces a compound classified as

Alik [6]

Answer is: a compound classified as ester.
Reaction of synthesis of estrers is calling the Fischer esterification, this is reaction of carboxylic acid with an alcohol in the presence of a dehydrating agent (usually sulfuric acid):
R-COOH + R-OH ⇄ R-COOR + H₂O.
Esters are less polar than alcohols and can make hydrogen bonds.

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2 years ago

_________ are elements of the same element that have a different _______________ due to a different number of _____________.

_ are elements of the same element that have a different _ due to a different number of _______.