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Sergeeva-Olga [200]
3 years ago
11

1. Which liquid sample is a pure substance?

Chemistry
1 answer:
IRISSAK [1]3 years ago
6 0

The whole Activity , poem and paragraph is missing in the question.

Answer:

(1) Liquid A

(2) Solid A

Explanation:

Using this part of the given poem

Substances and mixtures behave differently,

During boiling and melting most especially

Boiling point of substance is fixed while mixture is not

Substance melts completely but mixture does not

The boiling point of the Pure substance remain fixed after reaching its boiling point this is shown by Liquid A

Solid A is melting completely so Solid A is a pure substance.

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The total number of moles represented by 20 grams of CaCO3 is
Paul [167]
Moles =CaCo3=20g/100 gm/mol=0.2
5 0
4 years ago
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What is the approximate molar mass of a molecular solute if 300 g of the solute in 1000 g of water causes the solution to have a
valentina_108 [34]
Answer is: <span>the approximate molar mass of a molecular solute is 150 g.
</span>m(molecular solute) = 300 g.
m(water) = 1000 g ÷ 1000 g/kg = 1 kg.
ΔT = 101°C - 100°C = 1°C.
M(molecular solute) = Kb · m(molecular solute) / m(water) · ΔT.
M(molecular solute) = 0,512°C/m · 300 g / (1 kg · 1°C).
M(molecular solute) = 153,6 g/mol.
6 0
3 years ago
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Refer to the picture given below to give the answer. Don’t forget to use the correct amount of sig figs.
kumpel [21]

Answer:

9.62 μm

Explanation:

From the question given above, the following data were obtained:

Frequency (f) = 31.2 THz

Wavelength (λ) =..?

Next, we shall convert 31.2 THz to Hz.

This can be obtained as follow:

Recall:

1 THz = 1×10¹² Hz

Therefore,

31.2 THz = 31.2 THz × 1×10¹² Hz / 1 THz

31.2 THz = 3.12×10¹³ Hz

Therefore, 31.2 THz is equivalent to 3.12×10¹³ Hz.

Finally, we shall determine the wavelength (λ) infrared radiation as follow:

Frequency (f) = 3.12×10¹³ Hz.

Velocity (v) = 3×10⁸ m/s

Wavelength (λ) =..?

V = λf

3×10⁸ = λ × 3.12×10¹³

Divide both side by 3.12×10¹³

λ = 3×10⁸ / 3.12×10¹³

λ = 9.62×10¯⁶ m

Converting 9.62×10¯⁶ m to micro metre (μm) we have:

1 m = 1×10⁶ μm

Therefore,

9.62×10¯⁶ m = 9.62×10¯⁶ m × 1×10⁶ μm / 1 m

9.62×10¯⁶ m = 9.62 μm

Therefore, the wavelength of the infrared radiation is 9.62 μm

7 0
3 years ago
Lithium ions in Lithium selenide (Li2Se) have an atomic radius of 73 pm whereas the selenium ion is 184 pm. This compound is mos
NARA [144]

Explanation:

Formula according to the radius ratio rule is as follows.

             \frac{r_{+}}{r_{-}} = \frac{73}{184}

                          = 0.397

According to the radius ratio rule, as the calculated value is 0.397 and it lies in between 0.225 to 0.414. Therefore, it means that the type of void is tetrahedral.

Thus, we can conclude that the given compound is most likely to adopt closest-packed array with lithium ions occupying tetrahedral holes.

3 0
3 years ago
Given 1 molecule of glutamate, how much atp can you form by oxidative phosphorylation?
hammer [34]

1 molecule of glutamate can form 7.6 ATP can be formed by oxidative phosphorylation .

<h3>What is oxidative Phosphorylation ?</h3>

In the process of oxidative phosphorylation, oxygen is consumed as electrons are transferred through the mitochondrial electron transport chain and ATP is produced.

The bulk of the ATP required for higher animals and plants to sustain life is produced by oxidative phosphorylation, which is also in charge of creating and preserving metabolic equilibrium.

The glutamate carrier recycles glutamate outside of mitochondria (T9). One aspartate and 7.6 ATP are made at the best return for each glutamine.

To learn more about oxidative phosphorylation, refer to the below link:

brainly.com/question/25765324

#SPJ4

5 0
1 year ago
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