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zlopas [31]
4 years ago
9

Consider the following balanced equation:

Chemistry
1 answer:
Serga [27]4 years ago
4 0
<span>Zn⁰ + 2H⁺ ------> Zn²⁺ + H2⁰

H⁺ ion has oxidation number +1.
Zn²⁺ ion has oxidation number +2.
Atom of Zn has electric charge 0, and each hydrogen atom in the molecule H2 have oxidation number 0. So, </span> Zn and each hydrogen atom in H2 have oxidation numbers equals "0".<span>

</span><span>Answer is
D. Zn and each hydrogen atom in H2</span><span>

</span>
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Which of the following is an example of a physical change?
MatroZZZ [7]

Answer:

A

Explanation:

because you can turn the melted iron back to the solid it was before

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3 years ago
Describe the relationship between the mass volume and density of material
Ilia_Sergeevich [38]

Answer: For a given mass and volume, how much physical space a material takes up, of an object or substance, the density remains constant at a given temperature and pressure. The equation for this relationship is ρ = m / V in which ρ (rho) is density, m is mass and V is volume, making the density unit kg/m3.

Explanation: Hope that helps

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The element lead (pb) consists of four naturally occurring isotopes with atomic masses 203.97302,205.97444,206.97587, n 207.9766
Marina CMI [18]

The method of determining the most common isotope of lead is by determining the average atomic mass. The formula for determining the average atomic mass is:

average atomic mass = \Sigma {percent abundance}\times {atomic mass}

Substituting the values in the formula:

average atomic mass = \frac{{203.97302}\times {1.4}+{205.9744}\times {24.1}+{206.97587}\times {22.1}+{207.97663}\times {52.4}}{100}

average atomic mass = \frac{285.562228+4963.984004+4574.166727+10897.975412}{100}

average atomic mass = \frac{20721.688371}{100} = 207.22 amu

The most common isotope of lead is:

Lead - 207.22 amu

The atomic symbol of lead is Pb. The atomic number of Pb is 82.

So, the the most common isotope of lead can be written as:

_{207.22}^{82}Pb and Lead - 207.22 amu.

3 0
3 years ago
What do valence electrons determine
BARSIC [14]

Answer: the reactivity

Explanation:

8 0
3 years ago
Assume that you take 0.46 mol of KBr and do some chemistry on it such that all of the potassium and bromine are separated. How m
erastovalidia [21]

Answer:

We'll have 13.85 grams of potassium

Explanation:

Step 1: Data given

Moles KBr = 0.46 mol

Molar mass KBr = 119.00 g/mol

Molar mass K = 30.10 g/mol

Step 2: The balanced equation

2KBr ⇆ 2K + Br2

Step 3: Calculate moles of K

For 2 moles KBr consumed we'll have 2 moles K and 1 mol Br2

For 0.46 moles KBr we'll have 0.46 moles K

Step 4: Calculate mass of K

Mass K = moles K * molar mass K

Mass K = 0.46 moles * 30.10 g/mol

Mass K = 13.85 grams

We'll have 13.85 grams of potassium

3 0
4 years ago
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