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4 years ago

2 Points

Chemistry

2 answers:

777dan777 [17]4 years ago

6 0

Answer:

CH₄ $_{(g)}$ + 2O₂ $_{(g)}$ → CO₂ $_{(g)}$ + 2H₂O $_{(g)}$

Explanation:

This kind of reaction in which a hydrocarbon combines with oxygen gas is a combustion reaction. They are mostly used to produce heat energy that can be transformed into other forms of energy.

Every chemical reaction is made up of reactants and products. The combining species on the left hand side are the reactant and the products are the result of the combination.

Note: in writing chemical equations, the state of matter must always be included.

Reactants : Methane gas CH₄

Oxygen gas O₂

Product: Carbon dioxide CO₂

Water vapor H₂O

CH₄ $_{(g)}$ + 2O₂ $_{(g)}$ → CO₂ $_{(g)}$ + 2H₂O $_{(g)}$

marishachu [46]4 years ago

6 0

Answer:O C. CH4 (g) + 2O2 (g) – có (g) + 2H20 (g)

Explanation:

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What is water in a scientific knowledge

AleksandrR [38]

water in scientific knowledge is H20

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4 years ago

Taken at face value, does this DNA evidence incriminate Bill, Lucy, both, or neither? Explain your answer. (two to three sentenc

inysia [295]

Answer: Yes, it does incriminate both Bill and Lucy. Both had DNA found at the scene which makes them both suspects until further investigations are conducted.

Explanation: The term "at face value" means without further investigation so it is just saying looking at what has been seen are Bill and Lucy suspects. This shows that they are because both have DNA found at the scene even though they may not have been the murderer they are being investigated.

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4 years ago

Given the problem below, what would the first step be in solving it?

Hoochie [10]

Answer:

First step would be convert to moles

Final Answer: 37.8 g of NaCl

Explanation:

The reaction is:

2Na + Cl₂ → 2NaCI

We convert the mass of each reactant to moles:

18 g . 1mol /23g = 0.783 moles of Na

23g . 1mol / 70.9g = 0.324 moles of chlorine

We use the mole ratio to determine the limiting reactant:

Ratio is 2:1. 2 moles of Na react to 1 mol of chlorine

Then, 0.783 moles of Na, may react to (0.783 . 1)/2 = 0.391 moles.

Excellent!. We need 0.391 moles of Cl₂ and we only have 0.324 moles available. That's why the Cl₂ is our limiting reactant.

We use the mole ratio again, with the product side. (1:2)

1 mol of Cl₂ can produce 2 moles of NaCl

Then, our 0.324 moles of gas, may produce (0.324 . 2)/1 = 0.648 moles

Finally, we convert the moles to grams:

0.648 mol . 58.45g/mol =

4 0

3 years ago

Calculate the number of sodium ions, perchlorate ions, Cl atoms and O atoms in 17.8 g of sodium perchlorate. Enter your answers

Degger [83]

17.8 g of sodium perchlorate contains 8.73 × 10²² Na⁺ ions, 8.73 × 10²² ClO₄⁻ ions, 8.73 × 10²² Cl atoms and 3.49 × 10²³ O atoms.

First, we will convert 17.8 g of NaClO₄ to moles using its molar mass (122.44 g/mol).

$17.8 g \times \frac{1mol}{122.44g} = 0.145 mol$

Next, we will convert 0.145 moles to molecules of NaClO₄ using Avogadro's number; there are 6.02 × 10²³ molecules in 1 mole of molecules.

$0.145 mol \times \frac{6.02 \times 10^{23}molecules }{mol} = 8.73 \times 10^{22}molecules$

NaClO₄ is a strong electrolyte that dissociates according to the following equation.

NaClO₄ ⇒ Na⁺ + ClO₄⁻

The molar ratio of NaClO₄ to Na⁺ is 1:1. The number of Na⁺ in 8.73 × 10²² molecules of NaClO₄ is:

$8.73 \times 10^{22}moleculeNaClO_4 \times \frac{1 ion Na^{+} }{1moleculeNaClO_4} = 8.73 \times 10^{22}ion Na^{+}$

The molar ratio of NaClO₄ to ClO₄⁻ is 1:1. The number of ClO₄⁻ in 8.73 × 10²² molecules of NaClO₄ is:

$8.73 \times 10^{22}moleculeNaClO_4 \times \frac{1 ion ClO_4^{-} }{1moleculeNaClO_4} = 8.73 \times 10^{22}ion ClO_4^{-}$

The molar ratio of ClO₄⁻ to Cl is 1:1. The number of Cl in 8.73 × 10²² ions of ClO₄⁻ is:

$8.73 \times 10^{22}ion ClO_4^{-} \times \frac{1 atomCl }{1ion ClO_4^{-}} = 8.73 \times 10^{22}atom Cl$

The molar ratio of ClO₄⁻ to O is 1:1. The number of O in 8.73 × 10²² ions of ClO₄⁻ is:

$8.73 \times 10^{22}ion ClO_4^{-} \times \frac{4 atomO }{1ion ClO_4^{-}} = 3.49 \times 10^{23}atom O$

17.8 g of sodium perchlorate contains 8.73 × 10²² Na⁺ ions, 8.73 × 10²² ClO₄⁻ ions, 8.73 × 10²² Cl atoms and 3.49 × 10²³ O atoms.

You can learn more Avogadro's number here: brainly.com/question/13302703

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2 years ago

Where is the intersection of the position and time axes located on a position-versus-time graph?

Bad White [126]

it is located at the origin so A

hope this helped ^_^

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3 years ago