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2 years ago

9

Explain the relationship between cell, tissue and organs.

2 answers:

kobusy [5.1K]2 years ago

7 0

Answer:

The body has levels of organization that build on each other. Cells make up tissues, tissues make up organs, and organs make up organ systems. The function of an organ system depends on the integrated activity of its organs.

Pie2 years ago

3 0

Answer:

Cells are the basic units of living things. Tissues are groups of similar cells that are structurally combined to act together to perform a function or provide a structure. Like a muscle. Organs are more complex structures, usually composed of multiple tissue types, that perform complex functions.

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Sand dollars typically live in the intertidal zone. Which adaptation do sand dollars most likely have?

ziro4ka [17]

Neck to the sand in the water hope this help can i get brinlist??

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3 years ago

Read 2 more answers

How many valence electrons does group 18 have

Rus_ich [418]

Answer:

group 18 has 8 valence electrons, that's why they are stable.

8 0

2 years ago

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carbon disulfide is formed by the reaction of coke (carbon) with sulfur dioxide. how many moles of cs2 will be generated if 8.0

Murrr4er [49]

5C₂ + 4SO₂ ------> 2CS₂ + 8CO

mole ratio of C₂ : CS₂
=   5 : 2

∴ since C₂ contains 8 moles

then CS₂ contain    $( \frac{8}{5} ) * 2$ moles

= 3.2 moles

7 0

2 years ago

Match the following associations. Exothermic or endothermic

Alekssandra [29.7K]

<u>Answer:</u>

<em>1) ∆H is positive $\Rightarrow$ Endothermic </em>

<em>2) $E_p>E_r$ $\Rightarrow$ Endothermic </em>

<em>3) Energy is absorbed $\Rightarrow$ Endothermic </em>

<em>4) $E_r>E_p$ $\Rightarrow$ Exothermic </em>

<em>5) ∆H is negtive $\Rightarrow$ Exothermic </em>

<em></em>

<u>Explanation:</u>

∆H is called as enthalpy change

It is also called as Heat of reaction

Energy is required for the bond to break a bond.

Energy is released when a bond is formed.

$H_2+Cl_2>2HCl$

that is

$H-H+Cl-Cl>2H-Cl$

We see in this equation, bonds between hydrogen and chlorine molecules gets broken and on the right side bond is formed in HCl.

If energy of products greater than energy of reactants then the reaction enthalpy change is endothermic .

If energy of products lesser than energy of reactants then the reaction enthalpy change is exothermic .

For example

$\Delta H=E_p-E_r$

$=30KJ-20KJ$

$=+10KJ$

(positive hence endothermic)

$\Delta H=E_p-E_r$

$=10KJ-40KJ$

$=-30KJ$

(negative hence exothermic)

8 0

3 years ago

The normal freezing point of a certain liquid

slavikrds [6]

Answer : The molal freezing point depression constant of liquid X is, $4.12^oC/m$

Explanation : Given,

Mass of urea (solute) = 5.90 g

Mass of liquid X (solvent) = 450 g = 0.450 kg

Molar mass of urea = 60 g/mole

Formula used :

$\Delta T_f=i\times K_f\times m\\\\T^o-T_s=i\times K_f\times\frac{\text{Mass of urea}}{\text{Molar mass of urea}\times \text{Mass of liquid X Kg}}$

where,

$\Delta T_f$ = change in freezing point

$\Delta T_s$ = freezing point of solution = $-0.5^oC$

$\Delta T^o$ = freezing point of liquid X = $0.4^oC$

i = Van't Hoff factor = 1 (for non-electrolyte)

$K_f$ = Molal-freezing-point-depression constant = ?

m = molality

Now put all the given values in this formula, we get

$0.4^oC-(-0.5^oC)=1\times K_f\times \frac{5.90g}{60g/mol\times 0.450kg}$

$K_f=4.12^oC/m$

Therefore, the molal freezing point depression constant of liquid X is, $4.12^oC/m$

3 0

3 years ago