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4 years ago

ENERGY CANNOT BE CREATED TRUE False Other:

Chemistry

2 answers:

Yuliya22 [10]4 years ago

8 0

Answer:

its false ...............

oksian1 [2.3K]4 years ago

3 0

Answer:

true

Explanation:

- energy can be changed from one form to another but it cannot be created or destroyed

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Choose the pair of substances that are most likely to form a homogeneous solution.

oksano4ka [1.4K]

Answer is: <span>a. c6h14 and c10h20.
This pair will </span>most likely form a homogeneous solution because they are both nonpolar substances and "li<span>ke dissolves like".
Other pairs will not form homogeneous solution because nonpolar substances have low solubility in polar or ionic substances (for example LiBr is ionic and C</span>₅H₁₂ is nonpolar).

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3 years ago

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Complete the mechanism for the electrophilic addition wtien the alkene is treated with water in acid.

ser-zykov [4K]

Alkenes undergo Electrophillic Addition Reactions. Electrophiles are added across double bond. In given reaction the H⁺ is first added across double bond as the double bond being denser in electron density act as a neucleophile. A carbocation formed depends upon the nature of Alkene, if alkene is symmetrical (as in our case) then positive charge can get any position, but in case of unsymmetrical alkene the positive charge will go to that carbon which is attached to more carbon atoms. Then the water molecule attacks the carbocation and forms alcohol.

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4 years ago

1) A certain liquid has a density of 0.80 g/ml. What is the mass of a 40 ml sample of this liquid? 1)

Llana [10]

Answer:

The answer is

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

<h3>mass = Density × volume</h3>

From the question

volume = 40 mL

density = 0.80 g/mL

The mass is

mass = 40 × 0.8

We have the final answer as

Hope this helps you

8 0

3 years ago

The boiling point of a pure substance is defined as the temperature at which

aev [14]

Explanation:

The boiling point of a pure substance is the temperature at which the substance transitions from a liquid to the gaseous phase. At this point, the vapor pressure of the liquid is equal to the applied pressure on the liquid.

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3 years ago

An aqueous solution of nitric acid is standardized by titration with a 0.110 M solution of calcium hydroxide. If 21.1 mL of base

Mumz [18]

Answer:

$\large \boxed{\text{0.195 mol/L}}$

Explanation:

(a) Balanced equation

2HNO₃ + Ca(OH)₂ ⟶ Ca(NO₃)₂ + 2H₂O

(b) Moles of Ca(OH)₂

$\text{Moles of Ca(OH)}_{2} = \text{21.1 mL Ca(OH)}_{2} \times \dfrac{\text{0.110 mmol Ca(OH)}_{2}}{\text{1 mL Ca(OH)}_{2}}\\= \text{2.321 mmol Ca(OH)}_{2}$

(c) Moles of HNO₃

The molar ratio is 2 mol HNO₃:1 mol Ca(OH)₂

$\text{Moles of HNO}_{3} = \text{2.321 mmol Ca(OH)}_{2} \times\dfrac{\text{2 mmol HNO}_{3}}{\text{1 mmol Ca(OH)}_{2}}= \text{4.642 mmol HNO}_{3}$

(d) Molar concentration of HNO₃

$c = \dfrac{\text{moles of solute}}{\text{litres of solution}}\\\\c = \dfrac{n}{V}\\\\c= \dfrac{\text{4.642 mmol}}{\text{23.8 mL}} = \text{0.195 mol$\cdot$L$^{-1}$}\\\\\text{The molar concentration of the Ca(OH)$_{2}$ is $\large \boxed{\textbf{0.195 mol/L}}$}$

8 0

4 years ago