All categories

3 years ago

Please help me it's due tmrw

Chemistry

1 answer:

Advocard [28]3 years ago

4 0

Answer:

A: The first one because it is going upward and that means getting warmer.

B: The second one is the cooling curve because it is going downward and that means cooler.

Explanation:

I hope this helps.

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Aluminum has a density of 2.7g/cm how much space in cm 3 would 100 grams of aluminum occupy?

PIT_PIT [208]

Answer:

fgcbcncbvh

Explanation:

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8 0

3 years ago

Lead(IV) nitrate is formed via a single replacement reaction between lead and nitric acid. What is the coefficient of hydrogen g

Bas_tet [7]

Answer : The coefficient of hydrogen gas in the balanced equation is, 4

Explanation :

Balanced chemical reaction : It is defined as the reaction in which the number of atoms of individual elements present on reactant side must be equal to the product side.

Single replacement reaction : It is defined as a reaction in which the the more reactive element replace the less reactive element.

The balanced chemical reaction will be:

$Pb+4HNO_3\rightarrow Pb(NO_3)_4+4H^+$

In this reaction, lead is more reactive element than hydrogen so it can displace hydrogen element form its compound and form lead(IV) nitrate.

Thus, the coefficient of hydrogen gas in the balanced equation is, 4

4 0

3 years ago

When 3.0 grams of H2 is reacted with excess C at constant pressure, the reaction forms CH4 and releases 53.3 kJ of heat. C(s) +

Murrr4er [49]

Answer:

THE ENTHALPY OF REACTION IN KJ/MOL OF CH4 IS 7.07 KJ/MOL.

Explanation:

Mass of H2 = 3 g

Molar mass of H2 = 2 g/mol

Heat released = 53.3 kJ

Equation of the reaction:

C(s) + 2H2(g) -------> CH4(g)

First:

Calculate the number of moles of H2 that was used:

Number of moles = mass / molar mass

Number of moles = 3g / 2g

Number of moles = 1.5 moles

So therefore, when 53.3 kJ of heat was released from the reaction, 1.5 moles of hydrogen was used.

From the equation of the reaction, one mole of carbon reacts with two moles of hydrogen to form one mole of methane.

For 3 g of hydrogen, 1.5 mole of hydrogen is involved.

It means:

1.5 moles of hydrogen reacts with 0.75 moles of carbon and produces 0.75 moles of methane. This is so because the reaction occurs in 1: 2: 1 in respect to carbon, hydrogen and methane respectively.

So we can say that the production of 0.75 mole of methane will evolve 53.3 kJ of heat.

0.75 mole of methane releases 53.3 kJ of heat.

1 mole of methane will release ( 53.3 kJ * 1 / 0.75 )

= 71.0666 kJ of heat

In conclusion, the enthalpy of the reaction in kJ/ mole of CH4 is 71.07 kJ/mol.

7 0

4 years ago

Aluminum finds application as a foil for wrapping food stuves. Why?

pshichka [43]

Answer:

it keeps the heat in and the bugs and flys out

Explanation:

8 0

1 year ago

Which of the following is the chemical formula for an acid?

ser-zykov [4K]

Answer:

NH3 and HCl

Explanation:

NH3 and HCl are acids because of their hydrogen ions. NHO3 and NaOH are bases (you can tell because they have an OH). I don't believe SCl2 is an acid or a base

7 0

3 years ago

Please help me it's due tmrw ​

Please help me it's due tmrw