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taurus [48]
3 years ago
9

To balance a chemical equation, one: a. changes the subscripts of the formulas. b. changes the coefficients of the formulas. c.

eliminates some of the products or reactants. d. changes the chemical symbols of the elements.
Chemistry
1 answer:
AfilCa [17]3 years ago
4 0
<span>B. Changes the coefficients of the formulas.</span>
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Lithium is the Alkali metal



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Which compound most likely has Atoms Held together by ionic bonds?
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Answer:

MgS Magnesium sulfide

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Unlike the nervous system, the endocrine system ___ A) Responds quickly B) Does not respond C) Rarely responds D) Responds Slowl
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D) Responds slowly 


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4 years ago
F 2.50 × 10−2 g of solid Fe(NO3)3 is added to 100. ML of a 1.0 × 10−4 M NaOH solution, will a precipitate form? (ksp=4 × 10−38 f
vladimir1956 [14]

Answer:

A precipitate will be formed

Explanation:

The Ksp equilibrium of Fe(OH)₃ is:

Fe(OH)₃ (s) ⇄ Fe³⁺(aq)+ 3OH⁻(aq)

And its expression is:

Ksp = 4x10⁻³⁸ = [Fe³⁺] [OH⁻]³

<em>Where the concentrations are concentrations in molarity in equilibrium,</em>

We can write Q as:

Q = [Fe³⁺] [OH⁻]³

<em>Where [] are actual concentrations in molarity of each specie.</em>

<em />

When Q>= Ksp; a precipitate is formed,

When Q< Ksp no precipitate is produced:

[OH⁻] = [NaOH] = 1.0x10⁻⁴M

[Fe²⁺] = 2.50x10⁻²g * (1mol / 179.85g) / 0.100L = 1.39x10⁻³M

<em>179.85g/mol is molar mass of Fe(NO₃)₂ and the volume of the solution is 0.100L = 100mL</em>

<em />

Q = [Fe³⁺] [OH⁻]³

Q = [ 1.39x10⁻³] [ 1.0x10⁻⁴]³

Q = 3.8x10⁻¹⁵

As Q >> Ksp; A precipitate will be formed

7 0
3 years ago
Click on the alignment to view it at a larger size. Scan along the aligned sequences, letter by letter, noting any positions whe
miss Akunina [59]

Answer:

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Explanation:

Amino acids are referred to as organic compounds containing carboxylic acid functional groups and amine. Amino acids contain different elements such as nitrogen, hydrogen, carbon and oxygen. Examples of amino acids are glycine,  glutamic acid and alanine. In the given alignment, there are 8 amino acids between the sequence of human and monkey.

3 0
3 years ago
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