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4 years ago

A pencil exerts downward force on a table due to its ____...

Chemistry

2 answers:

vagabundo [1.1K]4 years ago

8 0

I believe it is D reaction force because it can't be weight because that doesn't make sense

Rzqust [24]4 years ago

5 0

Weight
i think, because without weight, it would not be right

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A pharmacy intern is asked to prepare 3 L of a 30% w/v solution. T he pharmacy stocks the active ingredient in 8-ounce bottles o

MariettaO [177]

Answer: The number of bottles that will be needed are 6

Explanation:

We are given:

Amount of solution, the intern is asked to prepare = 3 L = 3000 mL (Conversion factor: 1 L = 1000 mL)

Strength of solution needed = 30 % (w/v)

This means that in 100 mL of solution, the solute present is 30 grams

So, in 3000 mL of solution, the solute present will be = $\frac{30}{100}\times 3000=900g$

Active ingredient present in 1 bottle = 8 ounce of 70 % (w/v)

Conversion factor used: 1 ounce = 29.57 mL

So, $8ounce\times \frac{29.57mL}{1ounce}=236.6mL$

Amount of active ingredient present in 1 bottle = $236.6\times \frac{70}{100}=165.6g$

To calculate the number of bottles, we need to divide the total amount of solution needed by the amount of active ingredient present in 1 bottle, we get:

$\text{Number of bottles}=\frac{\text{Amount of solution to prepare}}{\text{Amount of active ingredient in 1 bottle}}$

Putting values in above equation, we get:

$\text{Number of bottles}=\frac{900g}{165.6g}\\\\\text{Number of bottles}=5.43\approx 6$

Hence, the number of bottles that will be needed are 6

6 0

3 years ago

The early ancestors of the horse (shown in the picture) were adapted to life in tropical forests. Gradually the forests disappea

Gre4nikov [31]

So here you go are taller with long legs and are capable of great speed to escape predators

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3 years ago

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[20 Points!] The solubility product constant of calcium hydroxide is 6.5 x 10^-6. If 0.10 mol of sodium hydroxide is added to 1

sleet_krkn [62]

For Ca(OH)2, Ksp = [Ca2+][OH-]^2
You have your Ksp as 6.5 x 10^-6. Your [OH-] comes almost entirely from the 0.10 mol of NaOH, since Ca(OH)2 barely dissolves. Your [OH-] is therefore 0.10 M (since you have 1 L of solution).

6.5 x 10^-6 = [Ca2+](0.10)^2
Solve for [Ca2+]:
6.5 x 10^-6 / (0.10)^2 = [Ca2+]
[Ca2+] = 0.00065 M

The maximum concentration of [Ca2+] is 0.00065 M, and you have 0.0010 M Ca(OH)2, so you’ll end up with 0.00065 M Ca2+ in solution.

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3 years ago

What force holds together the ions in a salt?

VLD [36.1K]

This pull holds the sodium atom near the chlorine atom, making a molecule of salt - one of the most stable molecules on Earth. Most of the solid things in the universe - like rocks - use ionic bonds to hold themselves together. That's because those same electric forces affect other nearby molecules of salt as well

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3 years ago

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In a science demonstration, a teacher mixed zinc (Zn) with hydrogen chloride (HCl) in a flask and quickly attached a balloon ove

Mumz [18]

Zn + 2HCl = ZnCl₂ + H₂↑

In the reaction forms zinc chloride and hydrogen.

4 0

3 years ago