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Troyanec [42]
4 years ago
15

5. Which is an example of inertia?

Chemistry
1 answer:
Hitman42 [59]4 years ago
6 0

Answer:

Explanation:

D. When the truck driver slammed on the brakes, all the boxes in the back

of the truck slid forward.

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Write a balanced chemical equation for the standard formation reaction of solid calcium hydroxide .
AveGali [126]

Calcium Hydroxide (Ca(OH)2) can actually be formed by the reaction of Calcium Oxide (CaO) with water (H2O). The complete balanced chemical reaction is:

<span>CaO  +  H2O  -->  Ca(OH)2</span>

 

<span>The subscript 2 in (OH) means that there are 2 O and 2 H on the product side. Hence, the equation is balanced already.</span>

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3 years ago
Is the dissolution of ammonium chloride in water an exothermic or endothermic<br> process.
Travka [436]
Endothermic because the separation of the ions dictate the overall reaction
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3 years ago
Assuming complete dissociation of the solute, how many grams of KNO3 must be added to 275 mL of water to produce a solution that
iragen [17]

Answer:

108.43 grams KNO₃

Explanation:

To solve this problem we use the formula:

  • ΔT = Kf * b * i

Where

  • ΔT is the temperature difference (14.5 K)
  • Kf is the cryoscopic constant (1.86 K·m⁻¹)
  • b is the molality of the solution (moles KNO₃ per kg of water)
  • and<em> i</em> is the van't Hoff factor (2 for KNO₃)

We <u>solve for b</u>:

  • 14.5 K = 1.86 K·m⁻¹ * b * 2
  • b = 3.90 m

Using the given volume of water and its density (aprx. 1 g/mL) we <u>calculate the necessary moles of KNO₃</u>:

  • 275 mL water ≅ 275 g water
  • 275 g /1000 = 0.275 kg
  • moles KNO₃ = molality * kg water = 3.90 * 0.275
  • moles KNO₃ = 1.0725 moles KNO₃

Finally we <u>convert KNO₃ moles to grams</u>, using its molecular weight:

  • 1.0725 moles KNO₃ * 101.103 g/mol = 108.43 grams KNO₃
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In which situation can a mixture always be called a solution?
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When the mixture is homogeneous 
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by exploring space then they saw them

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