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Juliette [100K]
3 years ago
12

An atom loses an electron. what will happen when it approaches a positively-charged ion?

Chemistry
1 answer:
nadezda [96]3 years ago
5 0
<span>The ions will repel each other. </span>
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Zinc dissolves in hydrochloric acid to yield hydrogen gas: zn(s) + 2hcl(aq) → zncl2(aq) + h2(g) when a 12.7 g chunk of zinc diss
N76 [4]

First calculate the initial moles of HCl.

HCl moles i = (1.45 moles / L) * 0.5 L = 0.725 moles HCl

 

Then calculate how much HCl is consumed by stoichiometry:

HCl moles consumed = (12.7 g Zn / 65.38 g / mol) * (2 moles HCl / 1 mole Zn) = 0.388 moles

 

So HCl moles left is:

HCl moles f = 0.725 – 0.388 = 0.3365 moles

For every 1 mole HCl there is 1 mole H, therefore:

H moles final = 0.3365 moles

 

So final concentration of H ions is:

<span>Concentration H = 0.3365 moles / 0.5 L = 0.673 M</span>

4 0
3 years ago
Which technique can be used to remove air bubbles from a syringe? a) Hold the syringe downward, shake vigorously for 10 seconds,
swat32

hold the syringe downward,shake vigorously for sometime,and expel the bubbles through the needle using the syringe plunger. hold the syringe upright, provide a firm tap or flick to the barrel

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2 years ago
What can you conclude about x-rays compared to microwaves? (2 points) X-rays have the same frequency as microwaves. X-rays have
Svet_ta [14]

Answer:

<em>X-rays have a shorter wavelength than microwaves.</em>

7 0
3 years ago
Determine the acid dissociation constant for a 0.010 M nitrous acid (HNO2) solution that has a pH of 2.70. Nitrous acid is a wea
Soloha48 [4]

Answer:

HNO₂ ⇄ H⁺ + NO₂⁻

Ka = 4.0 × 10⁻⁴

Explanation:

Step 1: Given data

  • Concentration of nitrous acid (Ca): 0.010 M
  • pH of the solution: 2.70

Step 2: Write the acid dissociation reaction

Nitrous acid is a weak acid that dissociates according to the following expression.

HNO₂ ⇄ H⁺ + NO₂⁻

Step 3: Calculate the concentration of H⁺

We will use the definition of pH.

pH = -log [H⁺]

[H⁺] = antilog - pH = antilog -2.70 = 2.00 × 10⁻³ M

Step 4: Calculate the acid dissociation constant (Ka)

For a weak acid, we can calculate Ka using the following expression.

Ka = [H⁺]²/Ca

Ka = (2.00 × 10⁻³)²/0.010

Ka = 4.0 × 10⁻⁴

5 0
3 years ago
True or False: Newton's first law of motion states that an object at rest will stay at rest, and an object in motion will stay i
Pepsi [2]
True, because that’s the right answer lol
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3 years ago
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