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2 years ago

What is the mass of an atom with 8 protons, 8 electrons, and 8 neutrons?

1 answer:

5 0

Answer:An oxygen atom usually has 8 protons, 8 neutrons, and 8 electrons. Looking at the periodic table, oxygen has atomic number 8 and atomic weight 15.999.

Explanation:

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Three children are playing in a pool in the back yard. One child is at the far left end of the pool and is splashing. A second c

torisob [31]

The answer is; D

When both kids splash at both ends of the pool, the waves formed from the different direction travel and meet in the middle of the pool (since they are traveling with the same speed). When the waves meet, they interact and form constructive waves. This means that when a crest meets a crest, the height doubles. This also occurs for the troughs. Therefore the sizes of the waves at the middle are twice the individual waves.

6 0

3 years ago

Read 2 more answers

In which species does nitrogen have an oxidation number of zero?

VARVARA [1.3K]

The most common species of nitrogen in which its oxidation state is zero is the diatomic nitrogen ( $N_{2}$ ). This is because the oxidation number of pure elements (whether alone as an atom or combined with other atoms of the same element such as the diatomic nitrogen) is always zero.

In addition to diatomic nitrogen, there are diazonium ( $R-N_{2}^{+}$ ) compounds where nitrogen has an oxidation number of zero.

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3 years ago

A piece of copper has a volume 130 L. What is the mass of the sample, in units of kilograms?

Reil [10]

Answer: The mass of the sample is 1264.800 kg.

Explanation:

Mass of the piece of copper = m

Volume of the copper price = $130 L=130,000 cm^3$

$1 L= 1,000 cm^3$

$Density=8.96 g/cm^3=\frac{Mass}{Volume}=\frac{Mass}{130,000 cm^3}$

$m=Density\times Volume=8.96 g/cm^3\times 130,000=1,264,800 g$

m = 1,264,800 g = 1,264.800 kg (1 kg = 1000 g)

The mass of the sample is 1264.800 kg.

3 0

3 years ago

A 75.0 mL sample of 0.020 M acetic acid (HC2H3O2) is titrated with 0.020 M NaOH. ? Determine the pH of the solution before the a

Bad White [126]

Answer:

pH = 3.23

Explanation:

Before the addition of any NaOH, the only you have is a 0.020M acetic acid solution. That is in equilibrium with water as follows:

HC₂H₃O₂(aq) + H₂O(l) ⇄ C₂H₃O₂⁻(aq) + H₃O⁺(aq)

The Ka of this reaction is:

Ka = 1.8x10⁻⁵ = [C₂H₃O₂⁻] [H₃O⁺] / [HC₂H₃O₂]

<em>Where [] are concentrations in equilibrium of each species</em>

As you have in solution just HC₂H₃O₂, the equilibrium concentrations will be:

[HC₂H₃O₂] = 0.020M - X

[C₂H₃O₂⁻] = X

[H₃O⁺] = X

<em>Where X is reaction coordinate.</em>

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Repalcing in Ka expression:

1.8x10⁻⁵ = [C₂H₃O₂⁻] [H₃O⁺] / [HC₂H₃O₂]

1.8x10⁻⁵ = [X] [X] / [0.020M - X]

3.6x10⁻⁷ - 1.8x10⁻⁵X = X²

3.6x10⁻⁷ - 1.8x10⁻⁵X - X² = 0

Solving for X:

X = -0.0006M → False solution. There is no negative concentrations

X = 0.000591M → Right solution.

As:

[H₃O⁺] = X

[H₃O⁺] = 0.000591M

As pH = -log[H₃O⁺]

6 0

3 years ago

Silver nitrate reacting with sodium hydroxide to produce silver hydroxide and sodium nitrate(?)

Nookie1986 [14]

Your answer is precipitation.
Are any of the reactants an acid? Can't be a neutralization reaction.
Double replacement reactions are NEVER redox reactions. Process of elimination.

8 0

3 years ago