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3 years ago

Is aluminum foil a mixture or a pure substance?

Chemistry

1 answer:

Naddik [55]3 years ago

6 0

Pure Substance.........

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What is the mass of 4.2 mol of the element iron (Fe)?Answer in units of g.

lbvjy [14]

Answer:

2.35 *10^2 g

Explanation:

4.2 mol Fe *55.845 g/1 mol = 234.549 > 2.35 *10^2 g

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3 years ago

If an atom has 6 electrons outside of its nucleus, which combination of protons and neutrons would result in a neutral atom?

777dan777 [17]

The answer will be: 6 protons, 6 neutrons.

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3 years ago

When the cobalt (II) solution completely dries out, the color of the remaining solid changes to blue color. What would be the ch

Studentka2010 [4]

Answer:

Co²⁺ ions

Explanation:

The ion responsible for the color change in the cobalt solution is Co²⁺ ions. This is because the chemical formula of the given compound is:

CoCl₂;

of the two elements that combined to form this specie, Co is a transition element.

Transition elements are known to occupy the d-block on the periodic table.
Most elements here are usually characterized by their variable oxidation states.
They also produce a wide range of colors.

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3 years ago

Propane is used as a fuel source on many barbeque grills. What is undergoing reduction during the burning of propane while grill

Anni [7]

Answer:

Oxygen

Explanation:

because oxygen is used when making and sustaining a fire.

I think this seems like something is missing from the question

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2 years ago

How many moles of sand (SiO2) are in 30 g of sand?

anastassius [24]

<h3>Answer:</h3>

0.50 mol SiO₂

<h3>General Formulas and Concepts:</h3>

<u>Math</u>

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

<u>Chemistry</u>

<u>Atomic Structure</u>

Reading a Periodic Table
Using Dimensional Analysis

<h3>Explanation:</h3>

<u>Step 1: Define</u>

30 g SiO₂ (sand)

<u>Step 2: Identify Conversions</u>

Molar Mass of Si - 28.09 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of SiO₂ - 28.09 + 2(16.00) = 60.09 g/mol

<u>Step 3: Convert</u>

Set up: $\displaystyle 30 \ g \ SiO_2(\frac{1 \ mol \ SiO_2}{60.09 \ g \ SiO_2})$
Multiply/Divide: $\displaystyle 0.499251 \ mol \ SiO_2$

<u>Step 4: Check</u>

<em>Follow sig figs and round. We are given 2 sig figs.</em>

0.499251 mol SiO₂ ≈ 0.50 mol SiO₂

5 0

3 years ago

Read 2 more answers