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4 years ago

Is the reaction between methane and oxygen endothermic or exothermic? Explain why we burn fossil fuels, such as natural gas.

1 answer:

vladimir1956 [14]4 years ago

6 0

The thing that governs whether a reaction is exothermic is the energy given out / used up to break / form the bonds in the reaction.

When two substances react, the bonds in those substances first break up, releasing energy, before re-forming in a different way, taking in energy. The nature of the bonds that are broken up and reformed determines whether more energy is given out (exothermic) or taken in (endothermic)

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What is the correct name of the compound Pb(NO3)2?

Margaret [11]

Answer:

it's lead (ii) nitrate the name

4 0

2 years ago

The substance argon has the following properties: normal melting point: 83.9 K normal boiling point: 87.4 K triple point: 0.68 a

Vsevolod [243]

Answer:

The final state of the substance is a gas.

The sample is initially a liquid. One or more phase changes will occur.

Explanation:

Let's consider the phase diagram for Argon (not to scale).

A sample of argon is initially at a pressure of 49.6 atm and a temperature of 101.4 K. The pressure on the sample is reduced to 0.680 atm at a constant temperature of 101.4 K. Which of the following are true? Choose all that apply

The final state of the substance is a gas. TRUE. At 0.680 atm and 101.4 K, the substance is a gas.

The gas initially present will solidify. FALSE. Initially, Ar is present as a liquid.

The final state of the substance is a solid. FALSE.

The sample is initially a liquid. One or more phase changes will occur. TRUE. The sample is initially liquid and only one phase change will occur.

5 0

4 years ago

6CO2 + 6 H2O —> C6H12O6 + 6O2

PilotLPTM [1.2K]

Answer:

The answer to your question is 0.5 moles

Explanation:

Data

moles of Glucose = ?

moles of carbon dioxide = 3

Balanced chemical reaction

6CO₂ + 6H₂O ⇒ C₆H₁₂O₆ + 6O₂

Process

To solve this problem, use proportions, and cross multiplication.

Use the coefficients of the balanced equation.

6 moles of CO₂ ----------------- 1 mol of C₆H₁₂O₆

3 moles of CO₂ ---------------- x

x = (3 x 1) / 6

-Simplification

x = 3/6

-Result

x = 0.5 moles of Glucose

3 0

3 years ago

Select the correct answer.

Svetlanka [38]

Answer:

alcohol

I hope this helps you

7 0

3 years ago

Which of the following electromagnetic waves are listed in the correct order from longest wavelength to shortest wavelength

Ghella [55]

Good afternoon,

Infrared light wavelengths = 1,000 nm - 750 nm

Visible light wavelengths = 750 nm - 400 nm

UV (Ultraviolet) light wavelengths = 400 nm - 10nm

So, the correct order is Infrared - Visible - Ultraviolet

I hope this has satisfied you, and if you need anymore help, feel free to ask.

Have a good afternoon!

8 0

3 years ago