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bija089 [108]
3 years ago
9

Isotopes ____________ the atomic mass of an element because they have a ____________ number of neutrons.

Chemistry
2 answers:
blondinia [14]3 years ago
8 0
B. Increase or decrease, different
Anon25 [30]3 years ago
3 0

Answer:

) B

Explanation:

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The given reaction: 
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is called a reversible reaction.

This means that, the reaction does not reach an end point.
In this type of reactions, reactants react together to form products, while products combine together to form reactants.
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Classify the following as a heterogeneous mixture, homogeneous mixture (solution), or a pure substance: lemonade with no pulp A.
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b

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What is the affect of increasing the water's mass?how does it reflect it's temperature?
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I assume what you're asking about is, how does the temperature changes when we increase water's mass, according the formula for heat ? 
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An atom of aluminum has 13 protons and 14 neutrons. what is the atomic mass
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3 years ago
What is the pH of .0003 M of NaOH
s344n2d4d5 [400]

We are given that the concentration of NaOH is 0.0003 M and are asked to calculate the pH

We know that NaOH dissociates by the following reaction:

NaOH → Na⁺ + OH⁻

Which means that one mole of NaOH produces one mole of OH⁻ ion, which is what we care about since the pH is affected only by the concentration of H⁺ and OH⁻ ions

Now that we know that one mole of NaOH produces one mole of OH⁻, 0.0003M NaOH will produce 0.0003M OH⁻

Concentration of OH⁻ (also written as [OH⁻]) = 3 * 10⁻⁴

<u>pOH of the solution:</u>

pOH = -log[OH⁻] = -log(3 * 10⁻⁴)

pOH = -0.477 + 4

pOH = 3.523

<u>pH of the solution:</u>

We know that the sum of pH and pOH of a solution is 14

pH + pOH = 14

pH + 3.523 = 14                              [subtracting 3.523 from both sides]

pH = 10.477                        

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