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3 years ago

Describe what atoms are.

Chemistry

1 answer:

umka21 [38]3 years ago

5 0

Answer:

the smallest component of an element having the chemical properties of the element

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Which statement is true about the potential energy diagram for an exothermic reaction? The products have less potential energy t

zvonat [6]

Answer:

The products have less potential energy than reactants.

Explanation:

For an exothermic reaction; the potential energy of the products is less than that of reactants.

Since, ΔH = Pot. energy of products - Pot. energy of reactants.

and it must be negative value.

The attached image shows also the potential energy diagram of an exothermic reaction.

So, the right choice is The products have less potential energy than reactants.

6 0

2 years ago

(15 PTS) What are two parts of the atomic theory of atoms?

AnnZ [28]

1) All matter is made of atoms. 2) Atoms are indivisible and indestructible.

8 0

2 years ago

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What is a closed container in relation to the law of conservation of matter

Brums [2.3K]

The law of conservation of mass or principle of mass conservation states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as system mass cannot change quantity if it is not added or removed. Hence, the quantity of mass is "conserved" over time.

6 0

2 years ago

The first excited electronic energy level of the helium atom is 3.13 x 10-18 J above the ground level. Estimate the temperature

salantis [7]

Answer:

75603.86473 K

Explanation:

Given that:

The 1st excited electronic energy level of He atom = 3.13 × 10⁻¹⁸ J

The objective of this question is to estimate the temperature at which the ratio of the population will be 5.0 between the first excited state to the ground state.

The formula for estimating the ratio of population in 1st excited state to the ground state can be computed as:

$\dfrac{N_2}{N_1} = e ^{^{-\dfrac{(E_2-E_1)}{KT}}} = e ^{^{-\dfrac{(\Delta E)}{KT}}}$

From the above equation:

Δ E = energy difference = 3.13 × 10⁻¹⁸ J

k = Boltzmann constant = 1.38 × 10⁻²³ J/K

$\dfrac{N_2}{N_1} = 0.5$

Thus:

$0.05 =e^{^{ -\dfrac{3.13 \times 10^{-18} \ J}{1.38\times 10^{-23 \ J/K}\times T}}}$

$In (0.05) = { -\dfrac{3.13 \times 10^{-18} \ J}{1.38\times 10^{-23 \ J/K}\times T}}}$

$-3.00 = { -\dfrac{3.13 \times 10^{-18} \ J}{1.38\times 10^{-23 \ J/K}\times T}}}$

$-3.00 = -226811.5942 \times \dfrac{1}{T}$

$T = \dfrac{-226811.5942}{-3.00 }$

T = 75603.86473 K

4 0

2 years ago

A reaction produces .815 moles of H2O. How many molecules produces?

Vera_Pavlovna [14]

To find out the number of water molecules produced simply use Avogadro’s constant, where 1 mol of any compound is equal to 6.02 x 10^23 molecules of the substance.

Multiply 0.815 to this value.

8 0

3 years ago

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