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3 years ago

A thermometer reads a temperature to be 38.0 °C. What is the temperature in

Chemistry

1 answer:

12345 [234]3 years ago

7 0

Answer:

$\boxed {\tt 311.15 \ K}$

Explanation:

To convert degrees Celsius to Kelvin, use the following formula.

$K= \textdegree C +273.15$

Since we are trying to find 38 degrees Celsius in Kelvin, so we should substitute 38 in for degrees Celsius.

$\textdegree C =38$

$K=38+273.15$

Add 38 and 273.15.

$K=311.15$

38 degrees Celsius is equal to 311.15 Kelvin

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How are properties useful in classifying materials

lukranit [14]

S. Properties can be anything from composition to color to ductility. Without knowing an object's properties, it is impossible to characterize it. For example, looking at some common properties of metals helps to differentiate them from non-metals or metalloids.

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Calcule la densidad del hidrógeno H2 en g/L a 327 mm Hg y 48ºc

tankabanditka [31]

<h3>The density of H₂ = 0.033 g/L</h3><h3>Further explanation</h3>

In general, the gas equation can be written

$\large {\boxed {\bold {PV = nRT}}}$

where

P = pressure, atm , N/m²

V = volume, liter

n = number of moles

R = gas constant = 0.082 l.atm / mol K (P= atm, v= liter),or 8,314 J/mol K (P=Pa or N/m², v= m³)

T = temperature, Kelvin

n = N / No

n = mole

No = Avogadro number (6.02.10²³)

n = m / MW

m = mass

MW = molecular weight

For density , can be formulated :

$\tt \rho=\dfrac{P\times MW}{R\times T}$

P = 327 mmHg = 0,430263 atm

R = 0.082 L.atm / mol K

T = 48 ºC = 321.15 K

MW of H₂ = 2.015 g/mol

The density :

$\rho=\dfrac{0,430263\times 2.015 }{0.082\times 321.15}\\\\\rho=0.033~g/L$

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2 years ago

If you pass electricity through pure water so that it changes to hydrogen and oxygen gas, what type of reaction has taken place?

zmey [24]

B. Decomposition.
<span>The electrodes used must not react with the elements thus formed; platinum is favorite for these.</span>

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3 years ago

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The partial Lewis structure that follows is for a hydrocarbon molecule. In the full Lewis structure, each carbon atom satisfies

ahrayia [7]

Answer:

$C-C> C=C> C\equiv C$

So, 2 $>$ 1 $>$ 3

Explanation:

Carbon is a non-metal and has 6 electrons. In the excited state, it contains 4 electrons in its outermost shell and so 4 electrons take place in covalent bond formation. In a molecule , 2 carbon atoms can be bound by a single bond, the double bond and by a triple bond. Since the bond length of $C\equiv C$ is 120 pm, the bond length of $C=C$ is 134 pm and the bond length of $C-C$ is 154 pm. Thus in the given compound, $C= C-C\equiv C$ , in which $C= C$ is labeled as 1, $C-C$ is labeled as 2 and $C\equiv C$ is labeled as 3. So the bond length of carbon-carbon bonds in the molecule, in decreasing order is $2 > 1 >3$ .

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3 years ago

Select all the correct answers.

Mashutka [201]

Answer:

Silver tarnishes and becomes black when exposed to oxygen:

Diesel fuel burns when it is heated:

Explanation:

Chemical Changes are those changes in which the chemistry at molecular level is changed as the starting material is converted in to a new and different final material. This change takes place with the breaking of old bonds and forming of new bonds respectively.

Silver tarnishes and becomes black when exposed to oxygen:

This is a chemical change as Silver a white and lustrous starting material is being converted into a tarnish black final material. However, Silver doesn't readily react with oxygen at normal conditions. It readily react with Sulfur containing compounds in air and produces black compound as Ag₂S.

Diesel fuel burns when it is heated:

Diesel is a mixture of hydrocarbons ranging approximately from C₁₀H₂₀ to C₁₅H₂₈. When these hydrocarbons are burnt they produces a new materials i.e. CO₂ and H₂O.

C₁₀H₂₀ + 15 O₂ → 10 CO₂ + 10 H₂O

Hence, it is also a chemical reaction.

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3 years ago

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