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saveliy_v [14]
4 years ago
14

Carbon burns in the presence of oxygen to give carbon dioxide. Which chemical equation describes this reaction?

Chemistry
2 answers:
Romashka-Z-Leto [24]4 years ago
7 0

<u>Answer:</u> The correct answer is Option 2.

<u>Explanation:</u>

When carbon burns in the presence of oxygen, it produces a gas known as carbon dioxide.

To write a chemical equation, we must follow some of the rules:

  • The reactants are written on the left side of the direction arrow.
  • A '+' sign is written between the reactants, if more than one reactant is present.
  • An arrow is added after all the reactants are written.
  • The products are written on the right side of the direction arrow.
  • A '+' sign is written between the products, if more than one reactant is present.

Here, carbon and oxygen are the reactants and carbon dioxide is the product.

Thus, the chemical equation representing this reaction follows:

\text{Carbon}+\text{Oxygen}\rightarrow \text{Carbon dioxide}

Hence, the correct answer is Option 2.

sasho [114]4 years ago
6 0
2.) carbon + oxygen → carbon dioxide 
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The air inside a bicycle tire pump has 27 joules of heat conducted away from while 77.9 joules of work done are being done on it
tatyana61 [14]

Answer:

51 J

Explanation:

The air inside a bicycle tire pump has 27 joules of heat conducted away. By convention, when heat is released, it takes the negative sign, so Q = -27 J.

77.9 joules of work done are being done on the air inside a bicycle tire pump. By convention, when work is being done on the system, it takes the positive sign, so W = 77.9 J

We can calculate the change in the internal energy (ΔU) using the following expression.

ΔU = Q + W

ΔU = (-27 J) + 77.9 J

ΔU =  51 J

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Rank the following atoms in order of increasing electronegativity.a. Se, O, S b. P, Na, Cl c. Cl, S, F d. O, P, N
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Answer:

a)- Se, S, O

b)- Na, P, Cl

c)- S, Cl, F

d)- P, N, O

Explanation:

We can solve this problem by looking at the Periodic Table. In a group, electronegativity increases from bottom to top; whereas in periods it increases from left to right.

Thus, we order the elements from lower to higher electronegativity as follows:

a. Se, O, S ⇒ order: Se, S, O

Because they are all in the same group. Se is near the bottom, followed by S and O is at the top.

b. P, Na, Cl ⇒ order: Na, P, Cl

They are in the same period. Na is at the left, followed by P and Cl is nearest the right.

c. Cl, S, F ⇒ order: S, Cl, F

P and Cl are in the same period, and P is at the left, so it has the lowest electronegativity. F is in the same group of Cl, but at the top. F has the highest electronegativity.

d. O, P, N ⇒ order: P, N, O

N and P are in the same group, but P is at the bottom so it has the lower electronegativity. N and O are in the same period, but O is at the right, so it is the most electronegative.

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A 2.75 M solution is diluted to 0.706 M, if the starting volume was 0.833L, what is the new volume?
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Answer:

3.2447

Explanation:

m1v1 = m2v2

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3 years ago
1. Some athletes have as little as 3.0% body fat. If such a person has a body mass of 65 kg, how many pounds of body fat does th
77julia77 [94]
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2. 0.94 g/mL----> 0.94 grams= 1 mL
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