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2 years ago

ANSWER THIS FOR 15 POINTS!!!

Chemistry

1 answer:

Llana [10]2 years ago

3 0

Answer:

it is the last one

Explanation:

cause over time the meatl will imit heat and heat up the air around it as it cools down slowly

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The following thermochemical equation is for the reaction of nitrogen(g) with oxygen(g) to form nitrogen dioxide(g). N2(g) + 2O2

Rzqust [24]

Answer: The mass of nitrogen gas reacted to produce given amount of energy is 5.99 grams.

Explanation:

The given chemical reaction follows:

$N_2(g)+2O_2(g)\rightarrow 2NO_2(g);\Delta H=66.4kJ$

We know that:

Molar mass of nitrogen gas = 28 g/mol

We are given:

Enthalpy change of the reaction = 14.2 kJ

To calculate the mass of nitrogen gas reacted, we use unitary method:

When enthalpy change of the reaction is 66.4 kJ, the mass of nitrogen gas reacted is 28 grams.

So, when enthalpy change of the reaction is 14.2 kJ, the mass of nitrogen gas reacted will be = $\frac{28}{66.4}\times 14.2=5.99g$

Hence, the mass of nitrogen gas reacted to produce given amount of energy is 5.99 grams.

8 0

3 years ago

When a substance is in the process of changing phases states of matter what happens to the temperature

Reptile [31]

Answer:

Temperature stays constant.

Explanation:

During a phase change, the temperature does not change. Temperature will only change when a phase change is completed.

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2 years ago

Iodine would have chemical properties most like?

mrs_skeptik [129]

manganese (Mn)
.tellurium (Te)
.chlorine (Cl).
xenon (Xe).

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2 years ago

Which of the following is a polyatomic ion? O A. HCI O B. Na O C. PO, O D. 52

timurjin [86]

I'm not the best with science but I believe the answer is B. Na.

8 0

3 years ago

Read 2 more answers

What is the equilibrium constant of a reaction

Svetach [21]

Homogeneous Reactions. At equilibrium, the rate of the forward and reverse reaction are equal, which is demonstrated by the arrows. The equilibrium constant, however, gives the ratio of the units (pressure or concentration) of the products to the reactants when the reaction is at equilibrium.

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3 years ago