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3 years ago

Which statement best explains why cells separate and expel waste?

Chemistry

1 answer:

STatiana [176]3 years ago

4 0

Answer:

I would say the 2nd one It helps growth and repair of cells of orgasms
But your school would probably say the 3rd one It helps remove toxins from the body to maintain homeostasis

Explanation:

2. Our cells produce a lot of waste that must be eliminated (excreted) from the body. These residues are called excreta. The residues formed from the chemical reactions that take place inside the cells can be eliminated through:

• of the respiratory system (carbon dioxide)

• skin (sweat)

urinary system (urine)

Our cells expel these substances to maintain the dynamic balance (homeostasis) of our body and promote our well-being.

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Substance A undergoes a first order reaction A  B with a half- life of 20 min at 25 °C. If the initial concentration of A ([A]◦

nydimaria [60]

The concentration of A will be <em>0.34 mol·L⁻¹</em> after 60 min.

In a first-order reaction, the formula for the amount remaining after <em>n</em> half-lives is

$\text{[A]} = \frac{\text{[A]}_{0}}{2^{n}}\\$

If $t_{\frac{1}{2}} = \text{20 min}\\$

$n = \frac{t}{t_{\frac{1}{2}}} = \frac{\text{60 min}}{\text{20 min}}= \text{3.0}$

∴ $\text{[A]} = \frac{\text{2.7 mol/L}}{2^{3.0}} = \frac{\text{2.7 mol/L}}{8.0} = \textbf{0.34 mol/L}$

6 0

3 years ago

lactic acid, which consists of C, H, and O, has long been thought to be responsible for muscle soreness following strenuous exer

Minchanka [31]

Answer:

C3H6O3

Explanation:

I got you babe

3 0

3 years ago

How are alcoholic fermentation and aerobic respiration similar?

Anon25 [30]

Releases carbon dioxide

3 0

3 years ago

The density of ethanol, C 2H 5OH, is 0.789 g/mL. How many milliliters of ethanol are needed to produce 25.0 g of CO 2 according

gogolik [260]

Answer:

11.1mL

Explanation:

The reaction expression is given as:

C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O

Given parameters:

density of ethanol = 0.789g/mL

mass of CO₂ = 25g

Unknown:

Volume of ethanol = ?

Solution:

First find the number of moles of the CO₂ from the given mass;

Number of moles = $\frac{mass}{molar mass}$

Molar mass of CO₂ = 12 + 2(16) = 44g/mol

Number of moles = $\frac{25}{44}$ = 0.57mol

Then;

Find the number of moles of ethanol used;

3 moles of CO₂ is produced from 1 mole of ethanol;

0.57mole of CO₂ will be produced from $\frac{0.57}{3}$ = 0.19mole of ethanol

Now;

Find the mass of the ethanol from the given mole;

Mass of ethanol = number of moles x molar mass

Molar mass of ethanol = 2(12) + 5(1) + 16 + 1 = 46g/mol

Mass of ethanol = 0.19 x 46 = 8.74g

Then;

Density is the mass per unit volume of a substance;

Density = $\frac{mass}{volume}$

Volume = $\frac{mass}{density}$

Volume = $\frac{8.74}{0.789}$ = 11.1mL

5 0

3 years ago

How do stomata help a plant maintain balance with their environment?

AnnZ [28]

Stomatal pores in plants regulate the amount of water and solutes within them by opening and closing their guard cells using osmotic pressure. In order for plants to produce energy and maintain cellular function, their cells undergo the highly intricate process of photosynthesis .

3 0

3 years ago