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4 years ago

Sayid drew an energy pyramid.

Chemistry

2 answers:

Lilit [14]4 years ago

5 0

Each section of the triangle would represent a trophic level

Kazeer [188]4 years ago

4 0

Answer:

thropic level

Explanation:

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In pure water at 25 °C, the concentration of a saturated solution of CuF2 is 7.4 × 10−3 M. If measured at the same temperature,

Romashka-Z-Leto [24]

Answer:

The concentration of a saturated solution of CuF₂ in aqueous 0.20 M NaF is 4.0×10⁻⁵ M.

Explanation:

Consider the ICE take for the solubility of the solid, CuF₂ as:

CuF₂ ⇄ Cu²⁺ + 2F⁻

At t=0 x - -

At t =equilibrium (x-s) s 2s

The expression for Solubility product for CuF₂ is:

$K_{sp}=\left [ Cu^{2+} \right ]\left [ F^- \right ]^2$

$K_{sp}=s\times {2s}^2$

$K_{sp}=4s^3$

Given s = 7.4×10⁻³ M

So, Ksp is:

$K_{sp}=4\times (7.4\times 10^{-3})^3$

Ksp = 1.6209×10⁻⁶

Now, we have to calculate the solubility of CuF₂ in NaF.

Thus, NaF already contain 0.20 M F⁻ ions

Consider the ICE take for the solubility of the solid, CuF₂ in NaFas:

CuF₂ ⇄ Cu²⁺ + 2F⁻

At t=0 x - 0.20

At t =equilibrium (x-s') s' 0.20+2s'

The expression for Solubility product for CuF₂ is:

$K_{sp}=\left [ Cu^{2+} \right ]\left [ F^- \right ]^2$

$1.6209\times 10^{-6}={s}'\times ({0.20+2{s}'})^2$

Solving for s', we get

s' = 4.0×10⁻⁵ M

The concentration of a saturated solution of CuF₂ in aqueous 0.20 M NaF is 4.0×10⁻⁵ M.

3 0

4 years ago

Describe the way the moon moves in space?

Scilla [17]

Gravitational Pull, is the answer. just like we orbit the sun, the moon orbits us. we act almost like a magnet, we follow the biggest guy as leader. if the sun dissapeared, we would die, but probably, we would start to revolve around jupiter as it is the biggest

4 0

3 years ago

True or False: Molar ratios come from the molar coefficients of balanced chemical reactions

jeka94

Answer:

1. true

2.true

3.fasle

Explanation:

sorry if im wrong.

have a lovely day.

7 0

3 years ago

Lactic acid, C3H6O3, is a monoprotic acid that is available in solid form. Determine the concentration of an unknown solution of

Andreas93 [3]

Answer:

0.497 moles/L

Explanation:

The reaction that takes place is:

C₃H₆O₃ + NaOH → C₃H₅ONa + H₂O

First we calculate the moles of lactic acid in 0,821 g, using its molar mass:

0,821 g ÷ 90 g/mol = 9,122x10⁻³mol lactic acid

One mole of lactic acid reacts with one mole of sodium hydroxide (it is a monoprotic acid), so in 18,34 mL of NaOH solution there are 9,122x10⁻³moles of NaOH:

18.34 mL ÷ 1000 = 0,01834 L

9,122x10⁻³mol ÷ 0,01834 L = 0.497 moles/L

8 0

4 years ago

Measurement errors do not have a significant impact on the results of a scientific investigation.

Elena L [17]

true i just did this

8 0

3 years ago