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3 years ago

What are 3 characteristics of a mixture?

Chemistry

1 answer:

bogdanovich [222]3 years ago

7 0

Answer:

The substances in a mixture can be separated using physical methods such as filtration, freezing, and distillation.

There is little, see Enthalpy of mixing, or no energy change when a mixture forms.

Mixtures have variable compositions, while compounds have a fixed, definite formula.

Explanation:

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The image shows the representation of an unknown element in the periodic table. A square is shown. Inside the square twelve is w

Ludmilka [50]

<u>Answer:</u> The correct answer is the mass number of the most common isotope of the element is 24.

<u>Explanation:</u>

We are given:

An element having atomic number 12 is magnesium and atomic mass of the element is 24.305

The image corresponding will be $_{24.305}\textrm{Mg}^{12}\\\text{Magnesium}$

The number '24.305' is the average atomic mass of magnesium element.

Average atomic mass is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.

Formula used to calculate average atomic mass follows:

$\text{Average atomic mass }=\sum_{i=1}^n\text{(Atomic mass of an isotopes)}_i\times \text{(Fractional abundance})_i$

Average atomic mass of magnesium = 24.305 amu

As, the average atomic mass of magnesium lies closer to the mass of Mg-24 isotope. This means that the relative abundance of this isotope is the highest of all the other isotopes.

The 'Mg-24' isotope is the most common isotope of the given element.

Hence, the correct answer is the mass number of the most common isotope of the element is 24.

4 0

2 years ago

Is mass conserved when 50 g of sugar undergoes a physical change?

Lena [83]

Yes, mass never changes. No exceptions.

6 0

3 years ago

Read 2 more answers

Question: Draw a valid Lewis structure for the molecule CH3NO in which there are no nonzero formal charges on any of the atoms.

iVinArrow [24]

The mentioned molecule with formula, CH₃NO where no bond is found between N and O can be depicted as formamide is shown in the attachment below.

The formal charges = Number of valence electrons for the atom (V) - the number of electrons in lone pairs (N) - 1/2 (number of electrons in bond pairs, B)

FC = V - N - B/2

Thus, there is a need to calculate valence electrons, electrons in lone pairs, and the number of electrons in bond pairs for each atom in the mentioned molecule.

V or valence electrons on C = 4e, on H = 1e, on N = 5e, and on O = 6e.

N or electrons in lone pairs on C = 0e, on H = 0e, on N = 2e, and on O = 4e.

B or number of electrons in bond pairs for C = 8e, for H = 2e, for N = 6e, and for O = 4e.

Thus, the formal charges for each will be,

C = 4 - 0 - (8/2) = 0

H = 1 - 0 - (2/2) = 0

N = 5 - 2 - (6/2) = 0

O = 6 - 4 - (4/2) = 0

Lewis dot structure for the given molecule is given in the attachment below:

3 0

2 years ago

Read 2 more answers

ASAP worth 15 points also

Taya2010 [7]

The person above me is correct I took a test on this so it’s the right answer

7 0

2 years ago

What is the number of proton in this atom

Vilka [71]

Answer:

There are 20 protons

Explanation:

4 0

2 years ago