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3 years ago

If the grass contains 220,000 kcal of energy, who much energy will be available to the owl?

Chemistry

1 answer:

Anni [7]3 years ago

3 0

Answer:

Generally, consumers only receive 10% of the energy from what they eat. So, if the grass had 220,000 kcal of energy, then the cow would receive 10% of that - 200kcal. And then when a human eats the cow, it will only receive 10% of the cow's energy. This is because within a food chain, energy is lost as organisms use their energy to survive - like moving and producing heat (if endothermic). So consumers do not get 100% of their food's energy. Hope this helps a little.

Explanation:

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Which compound would produce an acidic aqueous solution? Which compound would produce an acidic aqueous solution? RbH C2H2 PH3 C

Anvisha [2.4K]

Answer: Option (e) is the correct answer.

Explanation:

A compound that will dissociate in water or an aqueous solution to give hydrogen ions( $H^{+}$ ) is known as an acidic substance.

When RbH is dissolved in aqueous solution then it dissociates as follows.

$RbH \rightarrow Rb^{+} + H^{-}$ .

$C_{2}H_{2}$ is non-polar in nature. So, it will not dissociate into ions when dissolved in an aqueous solution.

$PH_{3}$ will also remain neutral and does not dissociate into ions.

$CaH_{2}$ when dissolved in water then it dissociates as follows.

$CaH_{2} \rightarrow Ca^{2+} + 2H^{-}$

Whereas when HF is dissolved in aqueous solution then the reaction will be as follows.

$HF \rightarrow H^{+} + F^{-}$

Thus, we can conclude that out of the given options HF is the compound which will produce an acidic aqueous solution.

4 0

4 years ago

Read 2 more answers

The coordination compound Co3[Cr(CN)6]2 contains Co2+ cations and a complex anion. What is the likely oxidation state for Cr in

otez555 [7]

Answer:

-3

Explanation:

The oxidation state or oxidation number of an atom is the total number of electrons that an atom either gains or loses in order to form a chemical bond with another atom.

The complex anion here is [Cr(CN)6]3-.

Now, as the oxidation state of CN or cyanide ligand is -1, and if we suppose the oxidation state of Cr to be 'x', then; x - 6 = -3 (overall charge on the anion),

so x= +3. Hence the oxidation state of Chromium in this complex hexacyanochromium (III) anion comes out to be -3.

7 0

3 years ago

Light of a certain energy Shines on a metal and causes electrons to be emitted based on the research of Albert Einstein what cha

Butoxors [25]

According to Albert Einstein's theory of photoelectric effect, metals will only emit electrons when the incident light has a frequency that is above the minimum or threshold frequency.

So if the frequency of the incident light is less than the threshold frequency then electrons will not be emitted from that metal.

7 0

3 years ago

trans-2-Butene does not exhibit a signal in the double-bond region of the spectrum (1600–1850 cm-1); however, IR spectroscopy is

spayn [35]

Answer:

The other signal that would indicate the presence of a C= C bond appears close to 3100 $cm^{-1}$ .

Explanation:

Bands that appear above 3000 $cm^{-1}$ are often unsaturation diagnoses suggest. The band at 3000- 3100 $cm^{-1}$ is characteristics for C-H stretching frequencies and normally is overlaps with the ones for alkanes because it is a band of weak intensity.

4 0

3 years ago

In a commercial chemical cold pack, an inner pouch containing water is broken and the water is allowed to mix with a sample of s

yulyashka [42]

Answer: Positive, positive

Explanation:

Entropy is the measure of randomness or disorder of a system. If a system moves from an ordered arrangement to a disordered arrangement, the entropy is said to decrease and vice versa.

$\Delta S$ is positive when randomness increases and $\Delta S$ is negative when randomness decreases.

Exothermic reactions are defined as the reactions in which energy is released in the form of heat and $\Delta H$ for the reaction comes out to be negative.

Endothermic reactions are defined as the reactions in which energy is absorbed in the form of heat and $\Delta H$ for the reaction comes out to be positive.

For a cold pack, the energy has to be absorbed for the dissolution of ammonium nitrate in water so that the surroundings feel cold.Thus as energy is absorbed, $\Delta H$ for the reaction comes out to be positive.

The solid form of ammonium nitrate is getting converted to ions and thus entropy increases and thus $\Delta S$ for the reaction comes out to be positive.

5 0

4 years ago