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2 years ago

Which of the following elements has the highest atomic radius, Sr or Cu

Chemistry

1 answer:

cestrela7 [59]2 years ago

6 0

Answer:

Sr or Strontium

Explanation:

sr: strontium has atomic radius of 255pm

cu: copper has an atomic radius of 128pm

they teach you in chem how to do it based off the chart but I don't remember that method

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Type of reaction PbSO. → PbSO3 + __02 Type of reaction:

Marysya12 [62]

Answer:

work out the mean mode median and range

Explanation:

6 0

2 years ago

Electromagnetic radiation with a wavelength of 525 nm appears as green light to the human eye. The energy of one photon of this

Sedbober [7]

Answer: The energy of one photon of the given light is $3.79\times 10^{-19}J$

Explanation:

To calculate the energy of one photon, we use Planck's equation, which is:

$E=\frac{hc}{\lambda}$

where,

$\lambda$ = wavelength of light = $525nm=5.25\times 10^{-7}m$ (Conversion factor: $1m=10^9nm$ )

h = Planck's constant = $6.625\times 10^{-34}J.s$

c = speed of light = $3\times 10^8m/s$

Putting values in above equation, we get:

$E=\frac{6.625\times 10^{-34}J.s\times 3\times 10^8m/s}{5.25\times 10^{-7}mm}\\\\E=3.79\times 10^{-19}J$

Hence, the energy of one photon of the given light is $3.79\times 10^{-19}J$

3 0

2 years ago

What change causes a substance to change states of matter?

pochemuha

If the states of matter have changed such as from solid to liquid, you have to remove or add energy.

3 0

3 years ago

Read 2 more answers

What are precautions to be taken when doing titrations? A-Make sure to always vigorously shake that flask after every drop if th

-BARSIC- [3]

Answer:

Explanation:

This is because all steps from A-D are important to obtain an accurate result

6 0

2 years ago

A cleaning bottle contains 83.1 g of ammonia. How many molecules of ammonia are in the bottle?

Tasya [4]

Answer:

2.94 x $10^2^4$

Explanation:

First we need to find out how many moles of ammonia there are, using the formula: Mass = mr x moles.

We know the mass is 83.1g, now we need to find the mR of ammonia - NH3.

N = 14, H = 1, so 14 + (3x1) = an mr of 17.

Moles = mass/ mr = 83.1/17 = 4.8882

Now we can multiply the moles by avogadro's constant to find the number of molecules:

4.8882 x (6.02 x $10^2^3$ ) = 2.94 x $10^2^4$ molecules of ammonia

4 0

3 years ago