All categories

2 years ago

What characteristic bright line spectrum of an elementforced when electrons?

1 answer:

8 0

The characteristic bright-line spectrum of an element is produced when its electrons return to lower energy levels To be in the ground state all electrons must be in their lowest energy state; all excited atoms must lose energy. The lost energy appears in the form of light. Hope this helped :)

You might be interested in

Identify the large brown tectonic plate and whether it is oceanic or continental.

Lady_Fox [76]

I found the image and the given choices. The choices were:

Eurasian, continental
South American, oceanic 
African, oceanic 
North American, continental

Based on the image, the large brown tectonic plate is NORTH AMERICA and it is a continental plate.

3 0

2 years ago

Read 2 more answers

Which of the following contains only one

kipiarov [429]

Answer:

A. elements

I hope it's helps you

7 0

2 years ago

Read 2 more answers

You and your lab partner are asked to determine the density of an aluminum bar. The mass is known accurately to 4 significant fi

zmey [24]

Answer:

Average density for method A = 2.4 g/cm³

Average density for method B = 2.605 g/cm³

Explanation:

In order to calculate the average density for each method, we need to add the data for each method, and then divide the result by the number of measurements (in this case is 4 for both methods):

For Method A:

Σ = 2.2 + 2.3 + 2.7 + 2.4 = 9.6

Average = 9.6/4 = 2.4 g/cm³

For Method B:

Σ = 2.603 + 2.601 + 2.605 + 2.611 = 10.420

Average = 10.420/4 = 2.605 g/cm³

5 0

2 years ago

Need help with 22 and 24

choli [55]

Answer:

22:

Formular:

$atomic \: mass = \frac{ \sum(isotopic \: mass \times \%abundance)}{100} \\$

substitute:

$atomic \: mass = \frac{(23.985 \times 78.70) + (24.986 \times 10.13) + (25.983 \times 11.17)}{100} \\ \\ = \frac{(1887.620) + (253.108) + (290.230)}{100} \\ \\ = \frac{2430.958}{100} \\ \\ { \boxed{ \boxed{average \: atomic \: mass = 24.3 \: amu}}}$

23:

Same element is represented by same number of protons. 

Answer:

6 protons. 6 protons

7 neutrons. 8 neutrons

6 electrons. 6 electrons

Note: Atoms with same proton number but different mass number are called isotopes

5 0

2 years ago

Read 2 more answers

1. What is the colour of FeSO4.7H20 crystals?How does this colour change upon heating? Give balanced

svet-max [94.6K]

1. What is the colour of FeSO4.7H20 crystals?How does this colour change upon heating?

Melanterite or FeSO4.7H20 is green in color
2FeSO4 ---> Fe2O3 + SO2 + SO3

2. a. What are redox reactions?
It is a type of chemical reaction that involves a transfer of electrons between two species.

b.Why is the reaction between MnO2 and HCl a
redox reaction?
Because there are atoms that are reduced and are oxidized.

c.Identify the substance oxidized and the
substance reduced in the above reaction.

MnO2 + 4 HCl ---> MnCl2 + 2H2O + Cl2
Mn was reduced and Cl was oxidized

5 0

2 years ago