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2 years ago

8

Which statement best describes the light that will cause emission of electrons from a given metal through the photoelectric effe

ct?
light with a low enough intensity
light with a high enough frequency
light with a high enough intensity
light with a low enough frequency

1 answer:

Sergio039 [100]2 years ago

4 0

Answer:

light with a high enough intensity

Explanation:

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Write the chemical symbol for the isotope of cobalt with 37 neutrons

oksano4ka [1.4K]

Answer:

64Co27

Explanation:

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3 years ago

While preforming an experiment involving colors and heat,Susan noticed that the black paper was warmer than the white piece of p

Firdavs [7]

Answer:

Blackbody radiation

Explanation:

This phenomenon described by Susan is know as black body radiation. Different materials by color reacts to incident radiation on them in diverse manner.

A white surface will reflect all the wavelength of light incident on it.
A black surface will absorb all the wavelength of light on it.

This absorption causes the black surface to be hotter compared to other surfaces.

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2 years ago

When air bags inflate, nitrogen gas is formed from sodium azide, along with solid sodium. what reaction category is this?

adell [148]

The answer is
alkaline silocate

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3 years ago

rite stepwise equations for protonation or deprotonation of this polyprotic species in water. What are the products of the first

adoni [48]

<u>Answer:</u> The products of the given chemical equation are $HCO_3^-\text{ and }OH^-$

<u>Explanation:</u>

Protonation equation is defined as the equation in which protons get added in the substance.

The chemical equation for the protonation of carbonate ion in the presence of water follows:

$CO_3^{2-}+H_2O\rightarrow HCO_3^-+OH^-$

By Stoichiometry of the reaction:

1 mole of carbonate ion reacts with 1 mole of water to produce 1 mole of hydrogen carbonate ion and 1 mole of hydroxide ion

Hence, the products of the given chemical equation are $HCO_3^-\text{ and }OH^-$

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3 years ago

69. Sequencing Arrange these hydrates in order of

Kobotan [32]

In order of increasing percent water content:CoCl₂.6H₂O, Ba(OH)₂.8H₂O, MgSO₄.7H₂O

<h3>Further explanation</h3>

$\tt \%element=\dfrac{Ar~element}{MW~compound}\times 100\%$

CoCl₂.6H₂O.MW=237.90 g/mol

6H₂O MW = 6.18=108 g/mol

$\tt \%H_2O=\dfrac{108}{237.9}\times 100\%=45.4\%$

MgSO₄.7H₂O.MW=246.48 g/mol

MW 7H₂O = 7.18=126 g/mol

$\tt \%H_2O=\dfrac{126}{246.48}\times 100\%=51.1\%$

Ba(OH)₂.8H₂O MW=315.48 g/mol

MW 8H₂O = 8.18=144 g/mol

$\tt \%H_2O=\dfrac{144}{315.48}\times 100\%=45.6\%$

4 0

2 years ago