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JulijaS [17]
2 years ago
8

Elements chemically combine in various ways to form most substances on Earth. These chemically combined elements are called ____

_________________.
elements

compounds

mixtures

solutions
Chemistry
2 answers:
dem82 [27]2 years ago
5 0
Mixtures because when u combing things it makes a mixture or it could be a compound if it is mixed together fully
AleksAgata [21]2 years ago
3 0

Answer:

compounds

Explanation:

the actual term would be chemical compound

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Determine the percent ionization of a 0.225 M solution of benzoic acid. Express your answer using two significant figures.
Assoli18 [71]

Answer:

1.68% is ionized

Explanation:

The Ka of benzoic acid, C₇H₆O₂, is 6.46x10⁻⁵, the equilibrium in water of this acid is:

C₇H₆O₂(aq) + H₂O(l) ⇄ C₇H₅O₂⁻(aq) + H₃O⁺(aq)

Ka = 6.46x10⁻⁵ = [C₇H₅O₂⁻] [H₃O⁺] / [C₇H₆O₂]

<em>Where [] are concentrations in equilibrium</em>

In equilibrium, some 0.225M of the acid will react producing both C₇H₅O₂⁻ and H₃O⁺, the equilibrium concentrations are:

[C₇H₆O₂] = 0.225-X

[C₇H₅O₂⁻] = X

[H₃O⁺] = X

Replacing:

6.46x10⁻⁵ = [X] [X] / [0.225-X]

1.4535x10⁻⁵ - 6.46x10⁻⁵X = X²

1.4535x10⁻⁵ - 6.46x10⁻⁵X - X² = 0

Solving for X:

X = -0.0038. False solution, there is no negative concentrations.

X = 0.00378M. Right solution.

That means percent ionization (100 times Amount of benzoic acid ionized  over the initial concentration of the acid) is:

0.00378M / 0.225M * 100 =

<h3>1.68% is ionized</h3>
8 0
2 years ago
Explain difference in melting points for the elements Na and Mg
Savatey [412]

Answer:

magnesium has a greater charge, there will be greater attraction between delocalised electrons and the positively charged ion.

Explanation:

I did this once and got it right I hope you get it right too

6 0
3 years ago
The distance between particles______when the temperature increases and
LekaFEV [45]

Answer:

increases

decreases

Explanation:

The distance between particles increases when the temperature increases and decreases when temperature decreases.

  • Temperature changes in a system causes the particle of such system to behave in different ways.
  • When particles gain heat energy as their temperature increases, they begin to move further apart.
  • As their temperature reduces they tend to coalesce.
5 0
2 years ago
40.00 grams of NaOH is added into distilled water and diluted with water to 1000mL of final volume. What is the final concentrat
tatyana61 [14]

Answer:

The molar mass of NaOH is 40.00 g/mol.

The number of moles of NaOH is equal to the ratio of its mass to molar mass.

The number of moles of NaOH =

40 g/mol

40 g

​

=1,000 mol

The molarity of NaOH solution is the ratio of number of moles of NaOH to total volume of solution in L.

M=

1 L

1 mol

​

=1 M

Explanation ;)

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2 years ago
What the first song come to your mind?
romanna [79]

Answer: Hey Brother by Avicii

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