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3 years ago

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6. The boys _____ their bags, tied their shoes tight, and started off down the trail. A. readjustment B. adjusted C. adjust D. a

djusts E. adjustments F. adjustable G. adjustment

1 answer:

Illusion [34]3 years ago

7 0

B. Adjusted that is your answer
I hope it was helpful

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You have a vial that may contain lead(II) cations or barium cations, but not both. Available to you are solutions of ammonium su

Bess [88]

Answer:

We should add, the KBr solution.

Explanation:

The vial contains Ba²⁺ and Pb²⁺

Our solutions are: (NH₄)₂ SO₄, NaF and KBr

We dissociate the solutions:

(NH₄)₂ SO₄ → 2NH₄⁺ + SO₄⁻²

NaF → Na⁺ + F⁻

KBr → K⁺ + Br-

When we add ammonium sulfate and sodium fluorine, we are adding sulfates and fluorines, but these two anions make precipitate both cations, we can not determine, if the vial contains Ba²⁺ or Pb²⁺

SO₄⁻²(aq) + Ba²⁺ (aq) → BaSO₄ (s) ↓

SO₄⁻² (aq)+ Pb²⁺(aq) → PbSO₄ (s) ↓

2F⁻ (aq) + Ba²⁺ (aq) → BaF₂ (s) ↓

2F⁻ (aq) + Pb²⁺ (aq) → PbF₂ (s) ↓

When we add the KBr, bromides only make precipitate with Pb²⁺, so the vial has only Pb²⁺ cation:

2Br⁻ (aq) + Ba²⁺ (aq) → BaBr₂ (aq)

2Br⁻ (aq) + Pb²⁺ (aq) → PbBr₂ (s) ↓

3 0

3 years ago

I need help pleaseee

Likurg_2 [28]

The answer is d!!!!!!!

3 0

2 years ago

Pleae help me I'm so confused <br>What is the velocity of a person that runs 40 km in 100 hours?

olga_2 [115]

Answer:

0.4 km/h velocity is also the direction their going, in this case the person, that I'll name billy bob joe, is going in so yeh

Explanation:

give me brainliest?

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2 years ago

Who was the first president of Jamaica

Lyrx [107]

Sir William Alexander Clarke Bustamante.

Hope This Helps!

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2 years ago

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A gas occupies the volume of 215ml at 15C and 86.4kPa?

kherson [118]

Answer:

About 0.1738 liters

Explanation:

Using the formula PV=nRT, where p represents pressure in atmospheres, v represents volume in liters, n represents the number of moles of ideal gas, R represents the ideal gas constant, and T represents the temperature in kelvin, you can solve this problem. But first, you need to convert to the proper units. 215ml=0.215L, 86.4kPa is about 0.8527 atmospheres, and 15C is 288K. Plugging this into the equation, you get:

$0.8527\cdot 0.215=n \cdot 0.0821 \cdot 288\\n\approx 7.754 \cdot 10^{-3}$

Now that you know the number of moles of gas, you can plug back into the equation with STP conditions:

$1V=7.754 \cdot 10^{-3} \cdot 0.0821 \cdot 273\\V\approx 0.1738L$

Hope this helps!

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3 years ago