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3 years ago

In the periodic table, the period number indicates

Chemistry

2 answers:

yaroslaw [1]3 years ago

5 0

D. the number of outermost energy level for elements in that period.

Mariulka [41]3 years ago

3 0

A. the number dots shown on the lewis dot diagrams for the element in the period

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Which of the following is true for compounds?

Anuta_ua [19.1K]

What are the following?

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3 years ago

Show the calculation of the molar mass (molecular weight) of a solute if a solution of 5.8 grams of the solute in 100 grams of w

Leni [432]

Answer : The molar mass of solute is, 89.9 g/mol

Explanation : Given,

Mass of solute = 5.8 g

Mass of solvent (water) = 100 g

Formula used :

$\Delta T_f=K_f\times m\\\\T_f^o-T_f=T_f\times\frac{\text{Mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Mass of water}}$

where,

$\Delta T_f$ = change in freezing point

$T_f^o$ = temperature of pure solvent (water) = $0^oC$

$T_f$ = temperature of solution = $1.20^oC$

$K_f$ = freezing point constant of water = $1.86^oC/m$

m = molality

Now put all the given values in this formula, we get

$(0^oC)-(1.20^oC)=1.86^oC/m\times \frac{5.8g\times 1000}{\text{Molar mass of solute}\times 100g}$

$\text{Molar mass of solute}=89.9g/mol$

Therefore, the molar mass of solute is, 89.9 g/mol

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3 years ago

Which in the following best describe carbon

Alina [70]

I just know it’s not conductive or brittle

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3 years ago

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2. Explain why carbon dioxide in the atmosphere is increasing.

Mariana [72]

Answer: Carbon dioxide concentrations are rising mostly because of the fossil fuels that people are burning for energy.

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(2)Greenhouse gases, such as carbon dioxide (CO2) and methane, trap the Sun's heat in Earth's atmosphere.

(3)It says that the 1997 Kyoto Protocol was an unmitigated success, with every single one of the 36 countries that signed up reducing their mean annual greenhouse gas emissions from 2008-2012 by an average of 5% relative to the levels seen in 1990.Jun 15, 2016 Many argue that Kyoto's failure is due to deficiencies in the structure of the agreement, such as the exemption of developing countries from reductions requirements, or the lack of an effective emissions trading scheme.by 2012

Explanation:

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3 years ago

(6 points) Alice owns 20 grams of a radioactive isotope that has a half-life of ln(4) years. (a) Find an equation for the mass m

Cloud [144]

<u>Answer:</u> The equation to calculate the mass of remaining isotope is $[A]=\frac{20}{10^{-0.217t}}$