What did high school scientists Danielle Mallabone create to help save lives

Explain how Niels Bohr’s observation of hydrogen’s flame test and line spectrum led to his model of the atoms containing electro

larisa86 [58]

In his observation, he notices that the hydrogen atom only emitted light of a fixed wavelength. He was able to discover that the electrons only orbit the nucleus of the atom at discrete orbits. When the electron ‘jumps’ from a higher to lower level orbit, it emits a wavelength. These wavelengths are unique to atoms of an element and can be used to identify them hence he led the way to the establishment of the light spectrum.

8 0

3 years ago

The pressure of Cl2 gas in a 2.0-L cylinder is 300. kPa at 25°C. What is the pressure (in kPa) when this gas is released into a

Veronika [31]

The Final Pressure of the gas is 6 kPa

<h3>What is Boyle's Law ?</h3>

At constant Temperature , the absolute pressure exerted by the gas is inversely proportional to the volume of the gas.

$\rm P_1V_1 = P_2V_2$

It is given that

$\rm P_1 = 300k.Pa\\T_1 = 25 \; Degree\\V_1 = 2L\\V_2 = 100L\\T_2 = 25 Degree\\P_2 = ?$

To determine Final Pressure , Boyle's Law will be applied

300 * 2 = P₂ * 100

P₂ = 300 * 2 / 100

P₂ =6 kPa

Therefore the Final Pressure of the gas is 6 kPa.

To know more about Boyle's Law

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4 0

2 years ago

A titration was performed on 50.0mL of 0.250 M NaOH.After the

777dan777 [17]

Answer:

1.750 M

Explanation:

In case of titration , the following formula can be used -

M₁V₁ = M₂V₂

where ,

M₁ = concentration of acid ,

V₁ = volume of acid ,

M₂ = concentration of base,

V₂ = volume of base .

from , the question ,

M₁ = ? M

V₁ = 7.14 mL

M₂ = 0.250 M

V₂ = 50 mL

Using the above formula , the molarity of acid , can be calculated as ,

M₁V₁ = M₂V₂

M₁ * 7.14 mL = 0.250 M * 50mL

M₁ = 1.750 M

Hence, the molarity of the hydrochloric acid = 1.750 M

6 0

3 years ago

How are radioactive isotopes used to determine the absolute age of igneous rock?

Likurg_2 [28]

Answer:

d) all of the above

5 0

3 years ago

Which aqueous solution will have the highest boiling point temperature? A. 0.100 molal NiBr2(aq) B. 0.250 molal CH3OH(aq) C. 0.1

zaharov [31]

Answer: 0.150 m $Na_2SO_4(aq)$ will have highest boiling point.

Explanation:

Formula used for Elevation in boiling point :

$\Delta T_b=i\times k_b\times m$

where

$\Delta T_b=T_b-T^o_b$ = elevation in boiling point

[tex[k_b[/tex] = boiling point constant

m = molality

i = Van't Hoff factor

A) 0.100 m $NiBr_2$

i = 3 as $NiBr_2\rightarrrow Ni^{2+}+2Br^-$

concentration will be $3\times 0.100=0.300$

B) 0.250 m $CH_3OH$

i = 1 as $CH_3OH$ is a non electrolyte

concentration will be $1\times 0.250=0.250$

C) 0.100 molal $MgSO_4(aq)$

i = 2 as $MgSO_4\rightarrrow Mg^{2+}+SO_4^{2-}$

concentration will be $2\times 0.100=0.200$

D. 0.150 molal $Na_2SO_4(aq)$

i = 3 as $Na_2SO_4\rightarrrow 2Na^{+}+SO_4^{2-}$

concentration will be $3\times 0.150=0.450$

E. 0.150 molal $NH_4NO_3(aq)$

i = 2 as $NH_4NO_3\rightarrrow NH_4^{+}+NO_3^{-}$

concentration will be $2\times 0.150=0.300$

The solution having the highest concentration of ions will have the highest boiling point and thus 0.150 m $Na_2SO_4(aq)$ will have highest boiling point.

8 0

3 years ago