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4 years ago

Which day of the year has the shotest period of day light in the northern hemesphiere

Chemistry

1 answer:

mr Goodwill [35]4 years ago

5 0

Answer:

Explanation:

Shortest Day of the Year in the Northern Hemisphere. The December solstice can be on December 20, 21, 22, or 23. The North Pole is tilted furthest from the Sun. It is the winter solstice in the Northern Hemisphere, where it is the darkest day of the year.

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What is the definition of the following word<br><br><br>sublimitation<br><br>

DiKsa [7]

the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

6 0

3 years ago

In a reaction, 5.3g of Sodium Carbonate reacted with 6g of ethanoic acid. The products were 2.2g of CO2, 0.9g of water and 8.2g

V125BC [204]

SOLUTION :

Law of conservation of Mass States that "Mass is neither created, nor destroyed".

→ Like Mass of Reactants = Mass of products.

REACTANTS :

Mass of Sodium Carbonate(given) = 5.3g

Mass of ethanoic acid(given)= 6g

The total mass of reactants:

= 5.3 + 6

= 11.3g

<h3>•Products are :</h3>

Mass of Carbon Dioxide = 2.2g

Mass of Water = 0.9g

Mass of Sodium ethanoate = 8.2g

The total mass of products is :

= 2.2 + 0.9 + 8.2

= 3.1 + 8.2

= 11.3g

Hence the, Mass of Reactants = Mass of products

∴ The given reaction is in agreement with the law of conservation.

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7 0

3 years ago

If a compound has a composition of 82% nitrogen and 18% hydrogen, what is the empirical formula for this compound

Damm [24]

Answer: The empirical formula for the given compound is $NH_3$

Explanation : Given,

Percentage of H = 18 %

Percentage of N = 82 %

Let the mass of compound be 100 g. So, percentages given are taken as mass.

Mass of H = 18 g

Mass of N = 82 g

To formulate the empirical formula, we need to follow some steps:

Step 1: Converting the given masses into moles.

Moles of Hydrogen = $\frac{\text{Given mass of Hydrogen}}{\text{Molar mass of Hydrogen}}=\frac{18g}{1g/mole}=18moles$

Moles of Nitrogen = $\frac{\text{Given mass of nitrogen}}{\text{Molar mass of nitrogen}}=\frac{82g}{14g/mole}=5.8moles$

Step 2: Calculating the mole ratio of the given elements.

For the mole ratio, we divide each value of the moles by the smallest number of moles calculated which is 5.8 moles.

For Hydrogen = $\frac{18}{5.8}=3.10\approx 3$

For Nitrogen = $\frac{5.8}{5.8}=1$

Step 3: Taking the mole ratio as their subscripts.

The ratio of H : N = 3 : 1

Hence, the empirical formula for the given compound is $NH_3$

3 0

3 years ago

Explain the differences between ionic and covalent bonding that account for the differences in their melting points.

Maurinko [17]

Answer:

El enlace iónico se da entre dos átomos diferentes (metálico y no. metálico), mientras que el enlace covalente se produce entre dos átomos iguales (no-metálicos). En el enlace covalente hay un compartimiento de electrones, mientras que en el enlace iónico hay una transferencia de electrones

Explanation:

5 0

3 years ago

What volume would 8.01×1022 molecules of an ideal gas occupy at STP?

Nataly_w [17]

Explanation:

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3 years ago