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3 years ago

13

Chemicals that help chemical reactions occur at faster rates in living organisms as known as

1 answer:

alexdok [17]3 years ago

3 0

Answer:

Explanation:

Organic Catalysts or they are also known as enzymes.

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Why is density a characteristic property of an object, but volume is not?

oksano4ka [1.4K]

Answer:

Because density is mass divided by volume and it will always stay the same for a certain substance while mass and volume will always vary.

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3 years ago

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In a calorimeter, the temperature of 100g of water decreased by 10 degrees Celsius when 10g of ice melted. How much heat was abs

Crazy boy [7]

So use equation: ΔH = MCΔT

M = mass of water
C = waters specific heat capacity (4.18)
ΔT = the temp. change of the reaction

ΔH = 100 x 4.18 x 10 = 4180J or 41.8KJ

so the cube absorbed 4180J of energy

hope that helps

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3 years ago

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What units can NOT be derived from a balanced chemical equation-

elena-14-01-66 [18.8K]

Answer:

D) Volume of gas

E) Temperature

Explanation:

A balanced chemical equation can provide the following information :

The reactants and products through their symbols and formulae. The ratio of molecules of reactants and products. As molecular masses are expressed in unified mass (u), the relative masses of reactants and products are known from the equation.

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3 years ago

A certain substance X condenses at a temperature of 123.3 degree C . But if a 650. g sample of X is prepared with 24.6 g of urea

Pavel [41]

Answer:

<u>The molal boiling point elevation constant is 1.59 ≈ 1.6</u> $Kkgmol^{-1}$

Explanation:

To solve this question , we will make use of the equation ,

Δ $T_{b} = i*K_{b} *m$

<em>where , </em>

<em>Δ $T_{b}$ is the change in boiling point of the substance $X$ ( ° $C$ or $K$ )</em>

<em> $i$ is the Vant Hoff Factor which = 1 in this case ( no unit )</em>

<em> $K_{b}$ is the mola boiling point elevation constant of X ( $Kkgmol^{-1}$ )</em>

<em> $m$ is the molality of the solution which has $(NH_{2})_{2} CO$ as the solute and $X$ as the solution ( $molkg^{-1}$ )</em>

Δ $T_{b}$ = $124.3 -123.3 = 1$ ° $C$ or $K$ ;
$i$ =1;
$m$ = $\frac{moles of solute}{weight of solvent(kg)}$ $molkg^{-1}$

∴ $m = \frac{\frac{24.6}{60} }{\frac{650}{1000} }$

<em>as the weight of $(NH_{2})_{2} CO$ is $60g$ and thus number of moles = $\frac{24.6}{60}$ </em>

<em>and the weight of solvent in $kg$ is $\frac{650}{1000}$ </em>

4. $K_{b}$ ⇒ ?

∴

$1=1*K_{b} *\frac{\frac{24.6}{60} }{\frac{650}{1000} }$

⇒ $K_{b}$ = $1.59$ ≈ 1.6 $Kkgmol^{-1}$

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3 years ago

Why is there little heat retained in the warm thermosphere? a. The pressure is too low c. The molecules move too fast b. The pre

iren [92.7K]

I believe the correct answer is A

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4 years ago

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