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3 years ago

Which of the following is a combustion reaction?

Chemistry

2 answers:

Zielflug [23.3K]3 years ago

8 0

Answer:

B. C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

Explanation:

A combustion reaction can be defined as a class of chemical reactions, that named as "burning", that occurs usually when a <em>hydrocarbon reacts with oxygen to produce carbon dioxide (CO₂) and water (H₂O).</em>

So, the correct answer is the choice B, 1.0 mole of propane "hydrocarbon" burned with 5.0 moles of oxygen to produce 3.0 moles of CO₂ and 4.0 moles of H₂O.

snow_lady [41]3 years ago

5 0

That would be B.

Its the combustion of propane in oxygen.

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Carbon 14 decays to Carbon 12 and has a half-life of 5730 years. If a fossil is analysed and it has 5 grams of Carbon 14 and 15

Katen [24]

Answer:

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Explanation:

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2 years ago

Two 10g blocks, one of copper and one of iron, were heated from 300 K to 400K (a temperature difference of 100 K).

12345 [234]

1) 385 J

2) 450 J

Explanation:

The amount of energy that must be absorbed by a certain substance in order to increase its temperature by $\Delta T$ is given by the equation:

$Q=mC\Delta T$

where

m is the mass of the substance

C is its specific heat capacity

$\Delta T$ is the increase in temperature of the substance

For the block of copper in this problem, we have:

m = 10 g is the mass

$C=0.385 J/gK$ is the specific heat capacity of copper

$\Delta T=400-300 = 100 K$ is the change in temperature

So, the energy absorbed by the block of copper is

$Q=(10)(0.385)(100)=385 J$

Similarly for the block of iron, the energy absorbed by the iron is given by

$Q=mC\Delta T$

where

m is the mass of the block of iron

C is its specific heat capacity of iron

$\Delta T$ is the increase in temperature of the block

Here we have:

m = 10 g is the mass of the block

$C=0.450 J/gK$ is the specific heat capacity of iron

$\Delta T=400-300 = 100 K$ is the change in temperature

So, the energy absorbed by the block of iron is

$Q=(10)(0.450)(100)=450 J$

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2 years ago

50 POINTS!!! Based on your observations in the virtual lab, fill in the data table below.

stiks02 [169]

Hi Khal75,

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2 years ago

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dybincka [34]

Answer:

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Explanation:

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2 years ago

In this reaction, what is the correct coefficient for hydrogen gas? ? h2 + ? o2 ? ? h2o

iragen [17]

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<span> 2h2 + o2 = 2h2o

Reactant = Product
H = 4 = 4
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Therefore, the correct coefficient for the hydrogen gas would be 2.</span>

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2 years ago