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2 years ago

9

Which of the following is a n o n i n f e c t i o u s disease that affects the respiratory system a influenza b cold c asthma d

parkinson's

1 answer:

musickatia [10]2 years ago

3 0

Answer:

c. Asthma

Explanation:

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Suppose 3.52 g of calcium chloride is completely dissolved in a beaker of water. what would be the number of chloride ions that

yaroslaw [1]

Answer:

Did the activities help you uderstand. the topic? Why?

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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

3 years ago

Melted rock can ooze out from below earths surface through a crack in the crust called a(n)?

Katen [24]

Melted rock can ooze out from below the earth's surface through a crack called a fault.

5 0

3 years ago

Plz answer ASAP!

Alchen [17]

What types of atoms typically form covalent bonds?

The correct answer:

d) Nonmetals with nonmetals, because their difference in electronegativity is below 1.7.

En example to explain:
An example of a covalent bonding: HCl -> 2 nonmentals
-> a difference in electronegativity less than 1.7:

EN(Cl) = 3.0 and EN (H) = 2.1 (you can search these values in a periodic table)
/\EN = 3.0 - 2.1 = 0.9

0.9 < 1.7

I hope this helped you out!

4 0

3 years ago

Read 2 more answers

7. A bicycle rider is traveling up a hill. When the rider reaches the top of the hill, she

Anna35 [415]

The one in the middle since when ur going down it’s more quicker anc faster .

8 0

2 years ago