In pavlov's experiments, the taste of food triggered salivation in a dog. the food in the dog's mouth was the

Biology

1 answer:

Bond [772]3 years ago

8 0

The food in the dog's mouth was the cheese.

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Solid sodium reacts with liquid water to form hydrogen gas according to the equation 2 Na(s) + 2 H₂O(l) → 2 NaOH(aq) + H₂(g) Wha

lana66690 [7]

Answer: 21850.42mmHg or 28.78atm

Explanation: From the equation of the reaction, 2 moles of sodium reacts with 2 moles of water to produce 2 moles of NaoH and 1 mole of hydrogen gas at s.t.p.

molar volume of gas at s.t.p. = 22.4dm^3,

standard temperature = 0°C or 273K,

standard pressure = 760mmHg or 1atm,

molar mass of Na = 23g;

volume of the container= 20L or 20dm^3

From the equation, 2 moles or 46g of Na produces i mole or 22.4 dm^3 of hydrogen.

Therefore, 1kg or 1000g of Na will produce 22.4 * 1000/(46)= 486dm^3 of hydrogen.

To find the pressure of the gas produced, the formula P1V1/T1 = P2V2/T2

P1= 760mmHg, T1= 273K, V1 (initial volume of gas)= 486dm^3, T2=50.0°C or 50+273K= 323K, V2( final volume of gas= volume of vessel)=20dm^3 P2=?

P1= P1V1*T2/(V2T1)= 760mmHg * 323/(273)= 21850.42mmHg or 1atm*21850.42/760= 28.78atm

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3 years ago

This type of reproduction produces variety in species.

ruslelena [56]

Sexual Reproductions (i.e. Meiosis)

In Meiosis you have a crossing over stage in prophase I, which will result in the exchange of genetic material + the random assortment at metaphase 1 and 2 increases the variety.

There is approximately 10 billion different ways that a child can look from a mixture of the paternal and maternal genes due to all the random events that happen in meiosis/ sexual reproduction.

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3 years ago

Which type of molecule stores the main source of energy used by animals?

Orlov [11]

Glycogen is <span>type of molecule stores the main source of energy used by animals.
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I hope this helps :)

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3 years ago

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What is the key feature that allows the plasma membrane to maintain

valkas [14]

Answer:

cell membrane

Explanation:

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3 years ago

Following the path of blood through the kidney, blood flows into the kidney via- artery which then divides into several- artery

tamaranim1 [39]

Answer:

Renal artery

Explanation:

The renal artery is the artery which leads into the kidney and branches into segmental arteries and further divides into interlobar arteries which penetrate the renal capsule and extend through the renal columns between the renal pyramids

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3 years ago