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3 years ago

Which two systems in the human body work together to eliminate carbon dioxide from the body?

2 answers:

5 0

Cardiovascular and circulatory

kidneys filter thru blood to take out waste
lungs breathe in oxygen, give blood 2 circulatory to carry! takes co2 out

Darya [45]3 years ago

3 0

Answer:

respritory and circulatory systems

lungs and heart

Explanation:

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Answer:

All of the energy from the Sun that reaches the Earth arrives as solar radiation, part of a large collection of energy called the electromagnetic radiation spectrum. Solar radiation includes visible light, ultraviolet light, infrared, radio waves, X-rays, and gamma rays. Radiation is one way to transfer heat.

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3 years ago

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Which type of reaction releases the greatest amount of energy per mole of reactant?(1) combustion (2) decomposition (3) nuclear

Marina CMI [18]

(3) nuclear fusion. Nuclear fusion reactions release a lot of energy

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4 years ago

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A sample of an unknown gas effuses in 14.4 min. An equal volume of H2 in the same apparatus under the same conditions effuses in

Elena-2011 [213]

Answer:- molar mass of the unknown gas is 71.5 gram per mol.

Solution:- From Graham's law of effusion rates, the rate of effusion of a gas is inversely proportional to the square root of it's molar mass.

When we compare the effusion rates of two gases then the formula for Graham's law is:

$\frac{rate_1}{rate_2}=\sqrt{\frac{M_2}{M_1}}$

In this formula, V stands for volume and M stands for molar mass

Rate is volume effused per unit time. Since, the volumes are same, the formula could be written as:

$\frac{t_2}{t_1}=\sqrt{\frac{M_2}{M_1}}$

let's say in formula, subscript 1 is for hydrogen gas and 2 is for the unknown gas.

Molar mass of hydrogen is 2.02 grams per mol and the time taken to effuse it is 2.42 min. The time taken to effuse the unknown gas is 14.4 min and we are asked to calculate it's molar mass. let's plug in the values in the formula:

$\frac{14.4}{2.42}=\sqrt{\frac{M_2}{2.02}}$

$5.95=\sqrt{\frac{M_2}{2.02}}$

doing squares to both sides:

$35.4=\frac{M_2}{2.02}$

$M_2=35.4*2.02$

$M_2=71.5$

So, the molar mass of the unknown gas is 71.5 grams per mol.

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4 years ago

This alkene can be prepared via Wittig reaction. Draw structural formulas for the aldehyde and the Wittig reagent.

Bad White [126]

Answer:

aldehyde and wittig reagent

Explanation:

Alkenes are the organic compounds with at least one c=c. They are homologous series with the general molecular formula of CnH2n.

The symbol R in the uploaded file is an alkyl, which has general formula of CnH2n+1.

Wittig reagent contains Phosphine with phosphorus and an oxygen atom the number (n) in the alkyl groups determines the number of carbon atoms in the resulting alkene.

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4 years ago

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Calculate the shortest wavelength of light capable of dissociating the Cl–F bond in one molecule of chlorine monofluoride if the

Fofino [41]

Answer:

477 nm

Explanation:

Using the expression for the energy as:

$E=\frac {h\times c}{\lambda}$