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3 years ago

The equation NaCl →Na +Cl is a ______ reaction.

2 answers:

hjlf3 years ago

8 0

You are looking at a decomposition reaction because the original compound is being broken into its individual elements.

astraxan [27]3 years ago

5 0

The equation NaCl →Na +Cl is a decomposition reaction since sodium chloride is broken down into its simpler components. Decomposition reaction involves the breaking down of larger compounds into a simpler one. It usually needs energy to occur.

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1) Какое количество вещества Феррум (III) гидроксида вступает в реакцию с 15 г сульфатной кислоты?

EleoNora [17]

i dont speak russian sorry

3 0

2 years ago

An element has five isotopes. Calculate the atomic mass of this element using the information below. Show all your work. Using t

Katena32 [7]

Answer: Sol:-

Data provided in the question is :-

Atomic mass of isotope -1 = 64 amu

Atomic mass of isotope -2 = 66 amu

Atomic mass of isotope -3 = 67 amu

Atomic mass of isotope -4 = 68 amu

Atomic mass of isotope - 5 = 70 amu

Percentage abundace of isotope - 1 = 48.89 %

Percentage abundance of isotope -2 = 27.81 %

Percentage abundance of isotope - 3 = 4.11%

Percentage abundance of isotope-4 = 18.57%

Percentage abundance of isotope - 5 = 0.62 %

Formula used :-

Average atomic mass of an element =[ {(atomic mass of isotope-1 * percentage abundance of isotope-1) + ( atomic mass of isotope-2 * percentage abundance of isotope -2) + ( atomic mass of isotope -3 * percantege abundance of isotope-3 ) + ( atomic mass of isotope-4 * percentage abundance of isotope-4) + (atomic mass of isotope-5 * percentage abundance of isotope-5)} / 100]

Calculation :-

Put all the value in the formula :-

Average atomic mass of an element = [{(64 * 48.89) + (66 * 27.81) + (67 * 4.11) + (68 * 18.57) + (70 * 0.62)} / 100] amu

= [{(3128.96) + (1835.46) +(257.37) + (1262.76) + (43.4)} / 100] amu

= {(6528.04) / 100} amu

= 65.2804 amu

Average atomic mass of an element is = 65.2804 amu

Then this mass is approximatly equal to atomic mass of zinc so this element would be zinc

atomic mass of zinc = 65.38 \approx 65.2804 amu

5 0

2 years ago

What is the age of mummified primate skin that contains 8.25% of the original quantity of 14C?

rjkz [21]

Answer:

20619.4793 years

Explanation:

The half life of carbon-14 = 5730 years

The formula for the half life for a first order kinetic reaction is:

$t_{1/2}=\frac {ln\ 2}{k}$

Where,

$t_{1/2}$ is the half life

k is the rate constant.

Thus rate constant is:

5730 years=ln(2)/k

k = 1.21×10⁻⁴ years ⁻¹

Using integrated rate law as:

$ln\ \frac {A_t}{A_0}=-k\times t$

Where,

$A_t$ is the concentration at time t

$A_0$ is the initial concentration

Given that the final concentration contains 8.25 % of the original quantity which means that:

$\frac {A_t}{A_0}=0.0825$

So,

ln(.0825)= -1.21×10⁻⁴×t

t = 20619.4793 years

8 0

2 years ago

Write the empirical formula for at least four ionic compounds that could be formed from the following ions: NO3, Pb^4+, NH4, SO4

Alisiya [41]

Explanation:

here's the answer to your question

double arrow just mean that it's a reversible process, and the reaction can go back and forth.

5 0

2 years ago

Why is it that no two elements have the exact same emission spectrum?

jonny [76]

Answer:

When atoms are excited they emit light of certain wavelengths which correspond to different colors. Each element produces a unique set of spectral lines. Since no two elements emit the same spectral lines, elements can be identified by their line spectrum.

Explanation:

5 0

2 years ago