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2 years ago

Equation

Chemistry

1 answer:

scoray [572]2 years ago

6 0

Answer:

The chemical equation that is provided is :

4Fe(s) + 302(g) → 2Fe2O3(aq) + 1644.3 kJ

1. reactants :

In this equation, the reactants are iron or Fe and oxygen or O that react with one another to produce a new compound or product.

2. Products:

The single product is produced by the given equation after the reaction between Fe and O is Fe2O3 ferric or iron oxide.

3. states of matter (all)

Elements state

Fe solid

O gas

Fe2O3 aqueous

4. Coieficents (all)

Elements state

Fe 4

O 3

Fe2O3 2

5. subscripts:

Elements state

Fe single

O 2

Fe2O3 Fe = 2 and O = 3

6. yield :

The representation of yield is by the arrow between reactants and products that is: →

7. Exothermic or Endothermic:

The reaction generates the energy and gives it to the surrounding which confirms that the reaction is an exothermic reaction.

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How many half-lives are required for the concentration of reactant to decrease to 1.56% of its original value?4247.56.56

neonofarm [45]

Answer:

6 half-lives are required for the concentration of reactant to decrease to 1.56% of its original value.

Explanation:

Using integrated rate law for first order kinetics as:

$[A_t]=[A_0]e^{-kt}$

Where,

$[A_t]$ is the concentration at time t

$[A_0]$ is the initial concentration

Given:

Concentration is decreased to 1.56 % which means that 0.0156 of $[A_0]$ is decomposed. So,

$\frac {[A_t]}{[A_0]}$ = 0.0156

Thus,

$\frac {[A_t]}{[A_0]}=e^{-k\times t}$

$0.0156=e^{-k\times t}$

kt = 4.1604

The expression for the half life is:-

Half life = 15.0 hours

$t_{1/2}=\frac {ln\ 2}{k}$

Where, k is rate constant

So,

$k=\frac {ln\ 2}{t_{1/2}}$

$\frac{4.1604}{t}=\frac {ln\ 2}{t_{1/2}}$

$t = 6\times t_{1/2}$

<u>6 half-lives are required for the concentration of reactant to decrease to 1.56% of its original value.</u>

6 0

3 years ago

which of the following substances is least able to cross the blood-brain barrier.)a. waterb. sodium ionsc glucosed. white blood

ivolga24 [154]

Answer:

d. white blood cells

Explanation:

It is the white blood cells that have the least tendency to cross the blood- brain barrier.

Blood- brain barrier is psychological barrier and restricts substances that circulate into the blood from crossing over the central nervous system.

Water, glucose as well as sodium ions can easily cross the barrier. As these are good for body supply energy to the brain.

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3 years ago

What volume is equivalent to 12.0 m^3?

anzhelika [568]

1.2 x 10^10 mm^3 is equivalent to 12.0 m^3

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2 years ago

How can the speed of solvent molecules be slowed down?

Darina [25.2K]

Explanation:

The speed of molecules increases when temperature is increased as it will result in more number of collisions between the molecules. Thus, there will be increase in kinetic energy of molecules and increase in the speed of solvent molecules.

Whereas on decreasing the temperature, the kinetic energy of molecules will decrease. This will result in less number of collisions between the molecules. Therefore, the speed of solvent molecules will slow down.

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3 years ago

I can't decide what to ship bacudeku or tododeku

iVinArrow [24]

Answer:

I would go with tododeku to leave room for kiribaku but that's my opinion

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Explanation:

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